]> de.git.xonotic.org Git - xonotic/darkplaces.git/blobdiff - gl_textures.c
fix a C++ error
[xonotic/darkplaces.git] / gl_textures.c
index bf504d96f68f4f5ae6e54de29276c1c3bc56e774..e263502a2f24087ec348ed1d20c92fdfe383d3b5 100644 (file)
@@ -31,6 +31,8 @@ cvar_t gl_texturecompression_sky = {CVAR_SAVE, "gl_texturecompression_sky", "0",
 cvar_t gl_texturecompression_lightcubemaps = {CVAR_SAVE, "gl_texturecompression_lightcubemaps", "1", "whether to compress light cubemaps (spotlights and other light projection images)"};
 cvar_t gl_texturecompression_reflectmask = {CVAR_SAVE, "gl_texturecompression_reflectmask", "1", "whether to compress reflection cubemap masks (mask of which areas of the texture should reflect the generic shiny cubemap)"};
 cvar_t gl_nopartialtextureupdates = {CVAR_SAVE, "gl_nopartialtextureupdates", "1", "use alternate path for dynamic lightmap updates that avoids a possibly slow code path in the driver"};
+cvar_t r_texture_dds_load_alphamode = {0, "r_texture_dds_load_alphamode", "1", "0: trust DDPF_ALPHAPIXELS flag, 1: texture format and brute force search if ambigous, 2: texture format only"};
+cvar_t r_texture_dds_swdecode = {0, "r_texture_dds_swdecode", "0", "0: don't software decode DDS, 1: software decode DDS if unsupported, 2: always software decode DDS"};
 
 qboolean       gl_filter_force = false;
 int            gl_filter_min = GL_LINEAR_MIPMAP_LINEAR;
@@ -94,13 +96,12 @@ typedef enum gltexturetype_e
        GLTEXTURETYPE_2D,
        GLTEXTURETYPE_3D,
        GLTEXTURETYPE_CUBEMAP,
-       GLTEXTURETYPE_RECTANGLE,
        GLTEXTURETYPE_TOTAL
 }
 gltexturetype_t;
 
-static int gltexturetypeenums[GLTEXTURETYPE_TOTAL] = {GL_TEXTURE_2D, GL_TEXTURE_3D, GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_RECTANGLE_ARB};
-static int gltexturetypedimensions[GLTEXTURETYPE_TOTAL] = {2, 3, 2, 2};
+static int gltexturetypeenums[GLTEXTURETYPE_TOTAL] = {GL_TEXTURE_2D, GL_TEXTURE_3D, GL_TEXTURE_CUBE_MAP_ARB};
+static int gltexturetypedimensions[GLTEXTURETYPE_TOTAL] = {2, 3, 2};
 static int cubemapside[6] =
 {
        GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB,
@@ -121,6 +122,7 @@ typedef struct gltexture_s
        // d3d stuff the backend needs
        void *d3dtexture;
 #ifdef SUPPORTD3D
+       qboolean d3disdepthsurface; // for depth/stencil surfaces
        int d3dformat;
        int d3dusage;
        int d3dpool;
@@ -217,11 +219,11 @@ static textypeinfo_t *R_GetTexTypeInfo(textype_t textype, int flags)
        case TEXTYPE_PALETTE:
                return (flags & TEXF_ALPHA) ? &textype_palette_alpha : &textype_palette;
        case TEXTYPE_RGBA:
-               if ((flags & TEXF_COMPRESS) && gl_texturecompression.integer >= 1 && vid.support.arb_texture_compression)
+               if ((flags & TEXF_COMPRESS) && gl_texturecompression.integer >= 1 && vid.support.ext_texture_compression_s3tc)
                        return (flags & TEXF_ALPHA) ? &textype_rgba_alpha_compress : &textype_rgba_compress;
                return (flags & TEXF_ALPHA) ? &textype_rgba_alpha : &textype_rgba;
        case TEXTYPE_BGRA:
-               if ((flags & TEXF_COMPRESS) && gl_texturecompression.integer >= 1 && vid.support.arb_texture_compression)
+               if ((flags & TEXF_COMPRESS) && gl_texturecompression.integer >= 1 && vid.support.ext_texture_compression_s3tc)
                        return (flags & TEXF_ALPHA) ? &textype_bgra_alpha_compress : &textype_bgra_compress;
                return (flags & TEXF_ALPHA) ? &textype_bgra_alpha : &textype_bgra;
        case TEXTYPE_ALPHA:
@@ -291,10 +293,37 @@ void R_FreeTexture(rtexture_t *rt)
        else
                Host_Error("R_FreeTexture: texture \"%s\" not linked in pool", glt->identifier);
 
-       if (glt->texnum)
+       switch(vid.renderpath)
        {
-               CHECKGLERROR
-               qglDeleteTextures(1, (GLuint *)&glt->texnum);CHECKGLERROR
+       case RENDERPATH_GL11:
+       case RENDERPATH_GL13:
+       case RENDERPATH_GL20:
+       case RENDERPATH_CGGL:
+               if (glt->texnum)
+               {
+                       CHECKGLERROR
+                       qglDeleteTextures(1, (GLuint *)&glt->texnum);CHECKGLERROR
+               }
+               break;
+       case RENDERPATH_D3D9:
+#ifdef SUPPORTD3D
+               if (glt->d3disdepthsurface)
+                       IDirect3DSurface9_Release((IDirect3DSurface9 *)glt->d3dtexture);
+               else if (glt->tiledepth > 1)
+                       IDirect3DVolumeTexture9_Release((IDirect3DVolumeTexture9 *)glt->d3dtexture);
+               else if (glt->sides == 6)
+                       IDirect3DCubeTexture9_Release((IDirect3DCubeTexture9 *)glt->d3dtexture);
+               else
+                       IDirect3DTexture9_Release((IDirect3DTexture9 *)glt->d3dtexture);
+               glt->d3dtexture = NULL;
+#endif
+               break;
+       case RENDERPATH_D3D10:
+               Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
+               break;
+       case RENDERPATH_D3D11:
+               Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
+               break;
        }
 
        if (glt->inputtexels)
@@ -340,7 +369,7 @@ void R_FreeTexturePool(rtexturepool_t **rtexturepool)
 
 typedef struct glmode_s
 {
-       char *name;
+       const char *name;
        int minification, magnification;
 }
 glmode_t;
@@ -358,7 +387,7 @@ static glmode_t modes[6] =
 #ifdef SUPPORTD3D
 typedef struct d3dmode_s
 {
-       char *name;
+       const char *name;
        int m1, m2;
 }
 d3dmode_t;
@@ -458,7 +487,7 @@ static void GL_TextureMode_f (void)
                        for (glt = pool->gltchain;glt;glt = glt->chain)
                        {
                                // only update already uploaded images
-                               if (glt->d3dtexture && (gl_filter_force || !(glt->flags & (TEXF_FORCENEAREST | TEXF_FORCELINEAR))))
+                               if (glt->d3dtexture && !glt->d3disdepthsurface && (gl_filter_force || !(glt->flags & (TEXF_FORCENEAREST | TEXF_FORCELINEAR))))
                                {
                                        if (glt->flags & TEXF_MIPMAP)
                                        {
@@ -479,6 +508,12 @@ static void GL_TextureMode_f (void)
                }
 #endif
                break;
+       case RENDERPATH_D3D10:
+               Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
+               break;
+       case RENDERPATH_D3D11:
+               Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
+               break;
        }
 }
 
@@ -505,38 +540,41 @@ static void GL_Texture_CalcImageSize(int texturetype, int flags, int miplevel, i
                break;
        }
 
-       if (outwidth)
+       if (vid.support.arb_texture_non_power_of_two)
        {
-               if (vid.support.arb_texture_non_power_of_two)
-                       width2 = min(inwidth >> picmip, maxsize);
-               else
-               {
-                       for (width2 = 1;width2 < inwidth;width2 <<= 1);
-                       for (width2 >>= picmip;width2 > maxsize;width2 >>= 1);
-               }
-               *outwidth = max(1, width2);
+               width2 = min(inwidth >> picmip, maxsize);
+               height2 = min(inheight >> picmip, maxsize);
+               depth2 = min(indepth >> picmip, maxsize);
        }
-       if (outheight)
+       else
        {
-               if (vid.support.arb_texture_non_power_of_two)
-                       height2 = min(inheight >> picmip, maxsize);
-               else
-               {
-                       for (height2 = 1;height2 < inheight;height2 <<= 1);
-                       for (height2 >>= picmip;height2 > maxsize;height2 >>= 1);
-               }
-               *outheight = max(1, height2);
+               for (width2 = 1;width2 < inwidth;width2 <<= 1);
+               for (width2 >>= picmip;width2 > maxsize;width2 >>= 1);
+               for (height2 = 1;height2 < inheight;height2 <<= 1);
+               for (height2 >>= picmip;height2 > maxsize;height2 >>= 1);
+               for (depth2 = 1;depth2 < indepth;depth2 <<= 1);
+               for (depth2 >>= picmip;depth2 > maxsize;depth2 >>= 1);
        }
-       if (outdepth)
+
+       switch(vid.renderpath)
        {
-               if (vid.support.arb_texture_non_power_of_two)
-                       depth2 = min(indepth >> picmip, maxsize);
-               else
+       case RENDERPATH_GL11:
+       case RENDERPATH_GL13:
+       case RENDERPATH_GL20:
+       case RENDERPATH_CGGL:
+       case RENDERPATH_D3D10:
+       case RENDERPATH_D3D11:
+               break;
+       case RENDERPATH_D3D9:
+#if 0
+               // for some reason the REF rasterizer (and hence the PIX debugger) does not like small textures...
+               if (texturetype == GLTEXTURETYPE_2D)
                {
-                       for (depth2 = 1;depth2 < indepth;depth2 <<= 1);
-                       for (depth2 >>= picmip;depth2 > maxsize;depth2 >>= 1);
+                       width2 = max(width2, 2);
+                       height2 = max(height2, 2);
                }
-               *outdepth = max(1, depth2);
+#endif
+               break;
        }
 
        miplevels = 1;
@@ -546,6 +584,13 @@ static void GL_Texture_CalcImageSize(int texturetype, int flags, int miplevel, i
                while(extent >>= 1)
                        miplevels++;
        }
+
+       if (outwidth)
+               *outwidth = max(1, width2);
+       if (outheight)
+               *outheight = max(1, height2);
+       if (outdepth)
+               *outdepth = max(1, depth2);
        if (outmiplevels)
                *outmiplevels = miplevels;
 }
@@ -704,7 +749,9 @@ static void r_textures_devicelost(void)
                        break;
                case RENDERPATH_D3D9:
 #ifdef SUPPORTD3D
-                       if (glt->tiledepth > 1)
+                       if (glt->d3disdepthsurface)
+                               IDirect3DSurface9_Release((IDirect3DSurface9 *)glt->d3dtexture);
+                       else if (glt->tiledepth > 1)
                                IDirect3DVolumeTexture9_Release((IDirect3DVolumeTexture9 *)glt->d3dtexture);
                        else if (glt->sides == 6)
                                IDirect3DCubeTexture9_Release((IDirect3DCubeTexture9 *)glt->d3dtexture);
@@ -744,7 +791,12 @@ static void r_textures_devicerestored(void)
 #ifdef SUPPORTD3D
                        {
                                HRESULT d3dresult;
-                               if (glt->tiledepth > 1)
+                               if (glt->d3disdepthsurface)
+                               {
+                                       if (FAILED(d3dresult = IDirect3DDevice9_CreateDepthStencilSurface(vid_d3d9dev, glt->tilewidth, glt->tileheight, (D3DFORMAT)glt->d3dformat, D3DMULTISAMPLE_NONE, 0, false, (IDirect3DSurface9 **)&glt->d3dtexture, NULL)))
+                                               Sys_Error("IDirect3DDevice9_CreateDepthStencilSurface failed!");
+                               }
+                               else if (glt->tiledepth > 1)
                                {
                                        if (FAILED(d3dresult = IDirect3DDevice9_CreateVolumeTexture(vid_d3d9dev, glt->tilewidth, glt->tileheight, glt->tiledepth, glt->miplevels, glt->d3dusage, (D3DFORMAT)glt->d3dformat, (D3DPOOL)glt->d3dpool, (IDirect3DVolumeTexture9 **)&glt->d3dtexture, NULL)))
                                                Sys_Error("IDirect3DDevice9_CreateVolumeTexture failed!");
@@ -799,6 +851,8 @@ void R_Textures_Init (void)
        Cvar_RegisterVariable (&gl_texturecompression_lightcubemaps);
        Cvar_RegisterVariable (&gl_texturecompression_reflectmask);
        Cvar_RegisterVariable (&gl_nopartialtextureupdates);
+       Cvar_RegisterVariable (&r_texture_dds_load_alphamode);
+       Cvar_RegisterVariable (&r_texture_dds_swdecode);
 
        R_RegisterModule("R_Textures", r_textures_start, r_textures_shutdown, r_textures_newmap, r_textures_devicelost, r_textures_devicerestored);
 }
@@ -968,12 +1022,24 @@ static void GL_SetupTextureParameters(int flags, textype_t textype, int texturet
        CHECKGLERROR
 }
 
-static void R_Upload(gltexture_t *glt, const unsigned char *data, int fragx, int fragy, int fragz, int fragwidth, int fragheight, int fragdepth)
+static void R_UploadPartialTexture(gltexture_t *glt, const unsigned char *data, int fragx, int fragy, int fragz, int fragwidth, int fragheight, int fragdepth)
 {
-       int i, mip, width, height, depth;
-       GLint oldbindtexnum = 0;
-       const unsigned char *prevbuffer;
-       prevbuffer = data;
+       if (data == NULL)
+               Sys_Error("R_UploadPartialTexture \"%s\": partial update with NULL pixels", glt->identifier);
+
+       if (glt->texturetype != GLTEXTURETYPE_2D)
+               Sys_Error("R_UploadPartialTexture \"%s\": partial update of type other than 2D", glt->identifier);
+
+       if (glt->textype->textype == TEXTYPE_PALETTE)
+               Sys_Error("R_UploadPartialTexture \"%s\": partial update of paletted texture", glt->identifier);
+
+       if (glt->flags & (TEXF_MIPMAP | TEXF_PICMIP))
+               Sys_Error("R_UploadPartialTexture \"%s\": partial update not supported with MIPMAP or PICMIP flags", glt->identifier);
+
+       if (glt->inputwidth != glt->tilewidth || glt->inputheight != glt->tileheight || glt->tiledepth != 1)
+               Sys_Error("R_UploadPartialTexture \"%s\": partial update not supported with stretched or special textures", glt->identifier);
+
+       // update a portion of the image
 
        switch(vid.renderpath)
        {
@@ -981,150 +1047,246 @@ static void R_Upload(gltexture_t *glt, const unsigned char *data, int fragx, int
        case RENDERPATH_GL13:
        case RENDERPATH_GL20:
        case RENDERPATH_CGGL:
-               CHECKGLERROR
-
-               // we need to restore the texture binding after finishing the upload
-               GL_ActiveTexture(0);
-               oldbindtexnum = R_Mesh_TexBound(0, gltexturetypeenums[glt->texturetype]);
-               qglBindTexture(gltexturetypeenums[glt->texturetype], glt->texnum);CHECKGLERROR
+               {
+                       int oldbindtexnum;
+                       CHECKGLERROR
+                       // we need to restore the texture binding after finishing the upload
+                       GL_ActiveTexture(0);
+                       oldbindtexnum = R_Mesh_TexBound(0, gltexturetypeenums[glt->texturetype]);
+                       qglBindTexture(gltexturetypeenums[glt->texturetype], glt->texnum);CHECKGLERROR
+                       qglTexSubImage2D(GL_TEXTURE_2D, 0, fragx, fragy, fragwidth, fragheight, glt->glformat, glt->gltype, data);CHECKGLERROR
+                       qglBindTexture(gltexturetypeenums[glt->texturetype], oldbindtexnum);CHECKGLERROR
+               }
                break;
        case RENDERPATH_D3D9:
+#ifdef SUPPORTD3D
+               {
+                       RECT d3drect;
+                       D3DLOCKED_RECT d3dlockedrect;
+                       int y;
+                       memset(&d3drect, 0, sizeof(d3drect));
+                       d3drect.left = fragx;
+                       d3drect.top = fragy;
+                       d3drect.right = fragx+fragwidth;
+                       d3drect.bottom = fragy+fragheight;
+                       if (IDirect3DTexture9_LockRect((IDirect3DTexture9*)glt->d3dtexture, 0, &d3dlockedrect, &d3drect, 0) == D3D_OK && d3dlockedrect.pBits)
+                       {
+                               for (y = 0;y < fragheight;y++)
+                                       memcpy((unsigned char *)d3dlockedrect.pBits + d3dlockedrect.Pitch * y, data + fragwidth*glt->bytesperpixel * y, fragwidth*glt->bytesperpixel);
+                               IDirect3DTexture9_UnlockRect((IDirect3DTexture9*)glt->d3dtexture, 0);
+                       }
+               }
+#endif
+               break;
        case RENDERPATH_D3D10:
+               Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
+               break;
        case RENDERPATH_D3D11:
+               Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
                break;
        }
+}
 
-       // these are rounded up versions of the size to do better resampling
-       if (vid.support.arb_texture_non_power_of_two || glt->texturetype == GLTEXTURETYPE_RECTANGLE)
-       {
-               width = glt->inputwidth;
-               height = glt->inputheight;
-               depth = glt->inputdepth;
-       }
-       else
-       {
-               for (width  = 1;width  < glt->inputwidth ;width  <<= 1);
-               for (height = 1;height < glt->inputheight;height <<= 1);
-               for (depth  = 1;depth  < glt->inputdepth ;depth  <<= 1);
-       }
+static void R_UploadFullTexture(gltexture_t *glt, const unsigned char *data)
+{
+       int i, mip = 0, width, height, depth;
+       GLint oldbindtexnum = 0;
+       const unsigned char *prevbuffer;
+       prevbuffer = data;
+
+       // error out if a stretch is needed on special texture types
+       if (glt->texturetype != GLTEXTURETYPE_2D && (glt->tilewidth != glt->inputwidth || glt->tileheight != glt->inputheight || glt->tiledepth != glt->inputdepth))
+               Sys_Error("R_UploadFullTexture \"%s\": stretch uploads allowed only on 2D textures\n", glt->identifier);
 
+       // when picmip or maxsize is applied, we scale up to a power of 2 multiple
+       // of the target size and then use the mipmap reduction function to get
+       // high quality supersampled results
+       for (width  = glt->tilewidth;width  < glt->inputwidth ;width  <<= 1);
+       for (height = glt->tileheight;height < glt->inputheight;height <<= 1);
+       for (depth  = glt->tiledepth;depth  < glt->inputdepth ;depth  <<= 1);
        R_MakeResizeBufferBigger(width * height * depth * glt->sides * glt->bytesperpixel);
-       R_MakeResizeBufferBigger(fragwidth * fragheight * fragdepth * glt->sides * glt->bytesperpixel);
 
        if (prevbuffer == NULL)
        {
-               memset(resizebuffer, 0, fragwidth * fragheight * fragdepth * glt->bytesperpixel);
+               width = glt->tilewidth;
+               height = glt->tileheight;
+               depth = glt->tiledepth;
+               memset(resizebuffer, 0, width * height * depth * glt->sides * glt->bytesperpixel);
                prevbuffer = resizebuffer;
        }
        else if (glt->textype->textype == TEXTYPE_PALETTE)
        {
                // promote paletted to BGRA, so we only have to worry about BGRA in the rest of this code
-               Image_Copy8bitBGRA(prevbuffer, colorconvertbuffer, fragwidth * fragheight * fragdepth * glt->sides, glt->palette);
+               Image_Copy8bitBGRA(prevbuffer, colorconvertbuffer, glt->inputwidth * glt->inputheight * glt->inputdepth * glt->sides, glt->palette);
                prevbuffer = colorconvertbuffer;
        }
 
-       // upload the image - preferring to do only complete uploads (drivers do not really like partial updates)
+       if (glt->flags & TEXF_RGBMULTIPLYBYALPHA)
+       {
+               // multiply RGB channels by A channel before uploading
+               int alpha;
+               for (i = 0;i < width*height*depth*4;i += 4)
+               {
+                       alpha = prevbuffer[i+3];
+                       colorconvertbuffer[i] = (prevbuffer[i] * alpha) >> 8;
+                       colorconvertbuffer[i+1] = (prevbuffer[i+1] * alpha) >> 8;
+                       colorconvertbuffer[i+2] = (prevbuffer[i+2] * alpha) >> 8;
+                       colorconvertbuffer[i+3] = alpha;
+               }
+               prevbuffer = colorconvertbuffer;
+       }
 
-       if ((glt->flags & (TEXF_MIPMAP | TEXF_PICMIP)) == 0 && glt->inputwidth == glt->tilewidth && glt->inputheight == glt->tileheight && glt->inputdepth == glt->tiledepth && (fragx != 0 || fragy != 0 || fragwidth != glt->tilewidth || fragheight != glt->tileheight))
+       // scale up to a power of 2 size (if appropriate)
+       if (glt->inputwidth != width || glt->inputheight != height || glt->inputdepth != depth)
        {
-               // update a portion of the image
-               if (glt->texturetype != GLTEXTURETYPE_2D)
-                       Sys_Error("R_Upload: partial update of type other than 2D");
-               switch(vid.renderpath)
+               Image_Resample32(prevbuffer, glt->inputwidth, glt->inputheight, glt->inputdepth, resizebuffer, width, height, depth, r_lerpimages.integer);
+               prevbuffer = resizebuffer;
+       }
+       // apply mipmap reduction algorithm to get down to picmip/max_size
+       while (width > glt->tilewidth || height > glt->tileheight || depth > glt->tiledepth)
+       {
+               Image_MipReduce32(prevbuffer, resizebuffer, &width, &height, &depth, glt->tilewidth, glt->tileheight, glt->tiledepth);
+               prevbuffer = resizebuffer;
+       }
+
+       // do the appropriate upload type...
+       switch(vid.renderpath)
+       {
+       case RENDERPATH_GL11:
+       case RENDERPATH_GL13:
+       case RENDERPATH_GL20:
+       case RENDERPATH_CGGL:
+               CHECKGLERROR
+
+               // we need to restore the texture binding after finishing the upload
+               GL_ActiveTexture(0);
+               oldbindtexnum = R_Mesh_TexBound(0, gltexturetypeenums[glt->texturetype]);
+               qglBindTexture(gltexturetypeenums[glt->texturetype], glt->texnum);CHECKGLERROR
+
+               if (qglGetCompressedTexImageARB)
                {
-               case RENDERPATH_GL11:
-               case RENDERPATH_GL13:
-               case RENDERPATH_GL20:
-               case RENDERPATH_CGGL:
-                       qglTexSubImage2D(GL_TEXTURE_2D, 0, fragx, fragy, fragwidth, fragheight, glt->glformat, glt->gltype, prevbuffer);CHECKGLERROR
-                       qglBindTexture(gltexturetypeenums[glt->texturetype], oldbindtexnum);CHECKGLERROR
-                       break;
-               case RENDERPATH_D3D9:
-#ifdef SUPPORTD3D
+                       if (gl_texturecompression.integer >= 2)
+                               qglHint(GL_TEXTURE_COMPRESSION_HINT_ARB, GL_NICEST);
+                       else
+                               qglHint(GL_TEXTURE_COMPRESSION_HINT_ARB, GL_FASTEST);
+                       CHECKGLERROR
+               }
+               switch(glt->texturetype)
+               {
+               case GLTEXTURETYPE_2D:
+                       qglTexImage2D(GL_TEXTURE_2D, mip++, glt->glinternalformat, width, height, 0, glt->glformat, glt->gltype, prevbuffer);CHECKGLERROR
+                       if (glt->flags & TEXF_MIPMAP)
                        {
-                               RECT d3drect;
-                               D3DLOCKED_RECT d3dlockedrect;
-                               int y;
-                               memset(&d3drect, 0, sizeof(d3drect));
-                               d3drect.left = fragx;
-                               d3drect.top = fragy;
-                               d3drect.right = fragx+fragwidth;
-                               d3drect.bottom = fragy+fragheight;
-                               if (IDirect3DTexture9_LockRect((IDirect3DTexture9*)glt->d3dtexture, 0, &d3dlockedrect, &d3drect, 0) == D3D_OK && d3dlockedrect.pBits)
+                               while (width > 1 || height > 1 || depth > 1)
                                {
-                                       for (y = 0;y < fragheight;y++)
-                                               memcpy((unsigned char *)d3dlockedrect.pBits + d3dlockedrect.Pitch * y, (unsigned char *)prevbuffer + fragwidth*glt->bytesperpixel * y, fragwidth*glt->bytesperpixel);
-                                       IDirect3DTexture9_UnlockRect((IDirect3DTexture9*)glt->d3dtexture, 0);
+                                       Image_MipReduce32(prevbuffer, resizebuffer, &width, &height, &depth, 1, 1, 1);
+                                       prevbuffer = resizebuffer;
+                                       qglTexImage2D(GL_TEXTURE_2D, mip++, glt->glinternalformat, width, height, 0, glt->glformat, glt->gltype, prevbuffer);CHECKGLERROR
                                }
                        }
-#endif
-                       break;
-               case RENDERPATH_D3D10:
-                       Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
                        break;
-               case RENDERPATH_D3D11:
-                       Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
-                       break;
-               }
-       }
-       else
-       {
-               if (fragx || fragy || fragz || glt->inputwidth != fragwidth || glt->inputheight != fragheight || glt->inputdepth != fragdepth)
-                       Host_Error("R_Upload: partial update not allowed on initial upload or in combination with PICMIP or MIPMAP\n");
-
-               // cubemaps contain multiple images and thus get processed a bit differently
-               if (glt->texturetype != GLTEXTURETYPE_CUBEMAP)
-               {
-                       if (glt->inputwidth != width || glt->inputheight != height || glt->inputdepth != depth)
+               case GLTEXTURETYPE_3D:
+                       qglTexImage3D(GL_TEXTURE_3D, mip++, glt->glinternalformat, width, height, depth, 0, glt->glformat, glt->gltype, prevbuffer);CHECKGLERROR
+                       if (glt->flags & TEXF_MIPMAP)
                        {
-                               Image_Resample32(prevbuffer, glt->inputwidth, glt->inputheight, glt->inputdepth, resizebuffer, width, height, depth, r_lerpimages.integer);
-                               prevbuffer = resizebuffer;
+                               while (width > 1 || height > 1 || depth > 1)
+                               {
+                                       Image_MipReduce32(prevbuffer, resizebuffer, &width, &height, &depth, 1, 1, 1);
+                                       prevbuffer = resizebuffer;
+                                       qglTexImage3D(GL_TEXTURE_3D, mip++, glt->glinternalformat, width, height, depth, 0, glt->glformat, glt->gltype, prevbuffer);CHECKGLERROR
+                               }
                        }
-                       // picmip/max_size
-                       while (width > glt->tilewidth || height > glt->tileheight || depth > glt->tiledepth)
+                       break;
+               case GLTEXTURETYPE_CUBEMAP:
+                       // convert and upload each side in turn,
+                       // from a continuous block of input texels
+                       texturebuffer = (unsigned char *)prevbuffer;
+                       for (i = 0;i < 6;i++)
                        {
-                               Image_MipReduce32(prevbuffer, resizebuffer, &width, &height, &depth, glt->tilewidth, glt->tileheight, glt->tiledepth);
-                               prevbuffer = resizebuffer;
+                               prevbuffer = texturebuffer;
+                               texturebuffer += glt->inputwidth * glt->inputheight * glt->inputdepth * glt->textype->inputbytesperpixel;
+                               if (glt->inputwidth != width || glt->inputheight != height || glt->inputdepth != depth)
+                               {
+                                       Image_Resample32(prevbuffer, glt->inputwidth, glt->inputheight, glt->inputdepth, resizebuffer, width, height, depth, r_lerpimages.integer);
+                                       prevbuffer = resizebuffer;
+                               }
+                               // picmip/max_size
+                               while (width > glt->tilewidth || height > glt->tileheight || depth > glt->tiledepth)
+                               {
+                                       Image_MipReduce32(prevbuffer, resizebuffer, &width, &height, &depth, glt->tilewidth, glt->tileheight, glt->tiledepth);
+                                       prevbuffer = resizebuffer;
+                               }
+                               mip = 0;
+                               qglTexImage2D(cubemapside[i], mip++, glt->glinternalformat, width, height, 0, glt->glformat, glt->gltype, prevbuffer);CHECKGLERROR
+                               if (glt->flags & TEXF_MIPMAP)
+                               {
+                                       while (width > 1 || height > 1 || depth > 1)
+                                       {
+                                               Image_MipReduce32(prevbuffer, resizebuffer, &width, &height, &depth, 1, 1, 1);
+                                               prevbuffer = resizebuffer;
+                                               qglTexImage2D(cubemapside[i], mip++, glt->glinternalformat, width, height, 0, glt->glformat, glt->gltype, prevbuffer);CHECKGLERROR
+                                       }
+                               }
                        }
+                       break;
                }
-               mip = 0;
-               switch(vid.renderpath)
+               GL_SetupTextureParameters(glt->flags, glt->textype->textype, glt->texturetype);
+               qglBindTexture(gltexturetypeenums[glt->texturetype], oldbindtexnum);CHECKGLERROR
+               break;
+       case RENDERPATH_D3D9:
+#ifdef SUPPORTD3D
+               if (!(glt->flags & TEXF_RENDERTARGET))
                {
-               case RENDERPATH_GL11:
-               case RENDERPATH_GL13:
-               case RENDERPATH_GL20:
-               case RENDERPATH_CGGL:
-                       if (qglGetCompressedTexImageARB)
-                       {
-                               if (gl_texturecompression.integer >= 2)
-                                       qglHint(GL_TEXTURE_COMPRESSION_HINT_ARB, GL_NICEST);
-                               else
-                                       qglHint(GL_TEXTURE_COMPRESSION_HINT_ARB, GL_FASTEST);
-                               CHECKGLERROR
-                       }
+                       D3DLOCKED_RECT d3dlockedrect;
+                       D3DLOCKED_BOX d3dlockedbox;
                        switch(glt->texturetype)
                        {
                        case GLTEXTURETYPE_2D:
-                               qglTexImage2D(GL_TEXTURE_2D, mip++, glt->glinternalformat, width, height, 0, glt->glformat, glt->gltype, prevbuffer);CHECKGLERROR
-                               if (glt->flags & TEXF_MIPMAP)
+                               if (IDirect3DTexture9_LockRect((IDirect3DTexture9*)glt->d3dtexture, mip, &d3dlockedrect, NULL, 0) == D3D_OK && d3dlockedrect.pBits)
+                               {
+                                       if (prevbuffer)
+                                               memcpy(d3dlockedrect.pBits, prevbuffer, width*height*glt->bytesperpixel);
+                                       else
+                                               memset(d3dlockedrect.pBits, 255, width*height*glt->bytesperpixel);
+                                       IDirect3DTexture9_UnlockRect((IDirect3DTexture9*)glt->d3dtexture, mip);
+                               }
+                               mip++;
+                               if ((glt->flags & TEXF_MIPMAP) && prevbuffer)
                                {
                                        while (width > 1 || height > 1 || depth > 1)
                                        {
                                                Image_MipReduce32(prevbuffer, resizebuffer, &width, &height, &depth, 1, 1, 1);
                                                prevbuffer = resizebuffer;
-                                               qglTexImage2D(GL_TEXTURE_2D, mip++, glt->glinternalformat, width, height, 0, glt->glformat, glt->gltype, prevbuffer);CHECKGLERROR
+                                               if (IDirect3DTexture9_LockRect((IDirect3DTexture9*)glt->d3dtexture, mip, &d3dlockedrect, NULL, 0) == D3D_OK && d3dlockedrect.pBits)
+                                               {
+                                                       memcpy(d3dlockedrect.pBits, prevbuffer, width*height*glt->bytesperpixel);
+                                                       IDirect3DTexture9_UnlockRect((IDirect3DTexture9*)glt->d3dtexture, mip);
+                                               }
+                                               mip++;
                                        }
                                }
                                break;
                        case GLTEXTURETYPE_3D:
-                               qglTexImage3D(GL_TEXTURE_3D, mip++, glt->glinternalformat, width, height, depth, 0, glt->glformat, glt->gltype, prevbuffer);CHECKGLERROR
+                               if (IDirect3DVolumeTexture9_LockBox((IDirect3DVolumeTexture9*)glt->d3dtexture, mip, &d3dlockedbox, NULL, 0) == D3D_OK && d3dlockedbox.pBits)
+                               {
+                                       // we are not honoring the RowPitch or SlicePitch, hopefully this works with all sizes
+                                       memcpy(d3dlockedbox.pBits, prevbuffer, width*height*depth*glt->bytesperpixel);
+                                       IDirect3DVolumeTexture9_UnlockBox((IDirect3DVolumeTexture9*)glt->d3dtexture, mip);
+                               }
+                               mip++;
                                if (glt->flags & TEXF_MIPMAP)
                                {
                                        while (width > 1 || height > 1 || depth > 1)
                                        {
                                                Image_MipReduce32(prevbuffer, resizebuffer, &width, &height, &depth, 1, 1, 1);
                                                prevbuffer = resizebuffer;
-                                               qglTexImage3D(GL_TEXTURE_3D, mip++, glt->glinternalformat, width, height, depth, 0, glt->glformat, glt->gltype, prevbuffer);CHECKGLERROR
+                                               if (IDirect3DVolumeTexture9_LockBox((IDirect3DVolumeTexture9*)glt->d3dtexture, mip, &d3dlockedbox, NULL, 0) == D3D_OK && d3dlockedbox.pBits)
+                                               {
+                                                       // we are not honoring the RowPitch or SlicePitch, hopefully this works with all sizes
+                                                       memcpy(d3dlockedbox.pBits, prevbuffer, width*height*depth*glt->bytesperpixel);
+                                                       IDirect3DVolumeTexture9_UnlockBox((IDirect3DVolumeTexture9*)glt->d3dtexture, mip);
+                                               }
+                                               mip++;
                                        }
                                }
                                break;
@@ -1148,64 +1310,10 @@ static void R_Upload(gltexture_t *glt, const unsigned char *data, int fragx, int
                                                prevbuffer = resizebuffer;
                                        }
                                        mip = 0;
-                                       qglTexImage2D(cubemapside[i], mip++, glt->glinternalformat, width, height, 0, glt->glformat, glt->gltype, prevbuffer);CHECKGLERROR
-                                       if (glt->flags & TEXF_MIPMAP)
+                                       if (IDirect3DCubeTexture9_LockRect((IDirect3DCubeTexture9*)glt->d3dtexture, (D3DCUBEMAP_FACES)i, mip, &d3dlockedrect, NULL, 0) == D3D_OK && d3dlockedrect.pBits)
                                        {
-                                               while (width > 1 || height > 1 || depth > 1)
-                                               {
-                                                       Image_MipReduce32(prevbuffer, resizebuffer, &width, &height, &depth, 1, 1, 1);
-                                                       prevbuffer = resizebuffer;
-                                                       qglTexImage2D(cubemapside[i], mip++, glt->glinternalformat, width, height, 0, glt->glformat, glt->gltype, prevbuffer);CHECKGLERROR
-                                               }
-                                       }
-                               }
-                               break;
-                       case GLTEXTURETYPE_RECTANGLE:
-                               qglTexImage2D(GL_TEXTURE_RECTANGLE_ARB, mip++, glt->glinternalformat, width, height, 0, glt->glformat, glt->gltype, NULL);CHECKGLERROR
-                               break;
-                       }
-                       GL_SetupTextureParameters(glt->flags, glt->textype->textype, glt->texturetype);
-                       qglBindTexture(gltexturetypeenums[glt->texturetype], oldbindtexnum);CHECKGLERROR
-                       break;
-               case RENDERPATH_D3D9:
-#ifdef SUPPORTD3D
-                       if (!(glt->flags & TEXF_RENDERTARGET))
-                       {
-                               D3DLOCKED_RECT d3dlockedrect;
-                               D3DLOCKED_BOX d3dlockedbox;
-                               switch(glt->texturetype)
-                               {
-                               case GLTEXTURETYPE_2D:
-                                       if (IDirect3DTexture9_LockRect((IDirect3DTexture9*)glt->d3dtexture, mip, &d3dlockedrect, NULL, 0) == D3D_OK && d3dlockedrect.pBits)
-                                       {
-                                               if (prevbuffer)
-                                                       memcpy(d3dlockedrect.pBits, prevbuffer, width*height*glt->bytesperpixel);
-                                               else
-                                                       memset(d3dlockedrect.pBits, 255, width*height*glt->bytesperpixel);
-                                               IDirect3DTexture9_UnlockRect((IDirect3DTexture9*)glt->d3dtexture, mip);
-                                       }
-                                       mip++;
-                                       if ((glt->flags & TEXF_MIPMAP) && prevbuffer)
-                                       {
-                                               while (width > 1 || height > 1 || depth > 1)
-                                               {
-                                                       Image_MipReduce32(prevbuffer, resizebuffer, &width, &height, &depth, 1, 1, 1);
-                                                       prevbuffer = resizebuffer;
-                                                       if (IDirect3DTexture9_LockRect((IDirect3DTexture9*)glt->d3dtexture, mip, &d3dlockedrect, NULL, 0) == D3D_OK && d3dlockedrect.pBits)
-                                                       {
-                                                               memcpy(d3dlockedrect.pBits, prevbuffer, width*height*glt->bytesperpixel);
-                                                               IDirect3DTexture9_UnlockRect((IDirect3DTexture9*)glt->d3dtexture, mip);
-                                                       }
-                                                       mip++;
-                                               }
-                                       }
-                                       break;
-                               case GLTEXTURETYPE_3D:
-                                       if (IDirect3DVolumeTexture9_LockBox((IDirect3DVolumeTexture9*)glt->d3dtexture, mip, &d3dlockedbox, NULL, 0) == D3D_OK && d3dlockedbox.pBits)
-                                       {
-                                               // we are not honoring the RowPitch or SlicePitch, hopefully this works with all sizes
-                                               memcpy(d3dlockedbox.pBits, prevbuffer, width*height*depth*glt->bytesperpixel);
-                                               IDirect3DVolumeTexture9_UnlockBox((IDirect3DVolumeTexture9*)glt->d3dtexture, mip);
+                                               memcpy(d3dlockedrect.pBits, prevbuffer, width*height*glt->bytesperpixel);
+                                               IDirect3DCubeTexture9_UnlockRect((IDirect3DCubeTexture9*)glt->d3dtexture, (D3DCUBEMAP_FACES)i, mip);
                                        }
                                        mip++;
                                        if (glt->flags & TEXF_MIPMAP)
@@ -1214,114 +1322,68 @@ static void R_Upload(gltexture_t *glt, const unsigned char *data, int fragx, int
                                                {
                                                        Image_MipReduce32(prevbuffer, resizebuffer, &width, &height, &depth, 1, 1, 1);
                                                        prevbuffer = resizebuffer;
-                                                       if (IDirect3DVolumeTexture9_LockBox((IDirect3DVolumeTexture9*)glt->d3dtexture, mip, &d3dlockedbox, NULL, 0) == D3D_OK && d3dlockedbox.pBits)
+                                                       if (IDirect3DCubeTexture9_LockRect((IDirect3DCubeTexture9*)glt->d3dtexture, (D3DCUBEMAP_FACES)i, mip, &d3dlockedrect, NULL, 0) == D3D_OK && d3dlockedrect.pBits)
                                                        {
-                                                               // we are not honoring the RowPitch or SlicePitch, hopefully this works with all sizes
-                                                               memcpy(d3dlockedbox.pBits, prevbuffer, width*height*depth*glt->bytesperpixel);
-                                                               IDirect3DVolumeTexture9_UnlockBox((IDirect3DVolumeTexture9*)glt->d3dtexture, mip);
+                                                               memcpy(d3dlockedrect.pBits, prevbuffer, width*height*glt->bytesperpixel);
+                                                               IDirect3DCubeTexture9_UnlockRect((IDirect3DCubeTexture9*)glt->d3dtexture, (D3DCUBEMAP_FACES)i, mip);
                                                        }
                                                        mip++;
                                                }
                                        }
-                                       break;
-                               case GLTEXTURETYPE_CUBEMAP:
-                                       // convert and upload each side in turn,
-                                       // from a continuous block of input texels
-                                       texturebuffer = (unsigned char *)prevbuffer;
-                                       for (i = 0;i < 6;i++)
-                                       {
-                                               prevbuffer = texturebuffer;
-                                               texturebuffer += glt->inputwidth * glt->inputheight * glt->inputdepth * glt->textype->inputbytesperpixel;
-                                               if (glt->inputwidth != width || glt->inputheight != height || glt->inputdepth != depth)
-                                               {
-                                                       Image_Resample32(prevbuffer, glt->inputwidth, glt->inputheight, glt->inputdepth, resizebuffer, width, height, depth, r_lerpimages.integer);
-                                                       prevbuffer = resizebuffer;
-                                               }
-                                               // picmip/max_size
-                                               while (width > glt->tilewidth || height > glt->tileheight || depth > glt->tiledepth)
-                                               {
-                                                       Image_MipReduce32(prevbuffer, resizebuffer, &width, &height, &depth, glt->tilewidth, glt->tileheight, glt->tiledepth);
-                                                       prevbuffer = resizebuffer;
-                                               }
-                                               mip = 0;
-                                               if (IDirect3DCubeTexture9_LockRect((IDirect3DCubeTexture9*)glt->d3dtexture, (D3DCUBEMAP_FACES)i, mip, &d3dlockedrect, NULL, 0) == D3D_OK && d3dlockedrect.pBits)
-                                               {
-                                                       memcpy(d3dlockedrect.pBits, prevbuffer, width*height*glt->bytesperpixel);
-                                                       IDirect3DCubeTexture9_UnlockRect((IDirect3DCubeTexture9*)glt->d3dtexture, (D3DCUBEMAP_FACES)i, mip);
-                                               }
-                                               mip++;
-                                               if (glt->flags & TEXF_MIPMAP)
-                                               {
-                                                       while (width > 1 || height > 1 || depth > 1)
-                                                       {
-                                                               Image_MipReduce32(prevbuffer, resizebuffer, &width, &height, &depth, 1, 1, 1);
-                                                               prevbuffer = resizebuffer;
-                                                               if (IDirect3DCubeTexture9_LockRect((IDirect3DCubeTexture9*)glt->d3dtexture, (D3DCUBEMAP_FACES)i, mip, &d3dlockedrect, NULL, 0) == D3D_OK && d3dlockedrect.pBits)
-                                                               {
-                                                                       memcpy(d3dlockedrect.pBits, prevbuffer, width*height*glt->bytesperpixel);
-                                                                       IDirect3DCubeTexture9_UnlockRect((IDirect3DCubeTexture9*)glt->d3dtexture, (D3DCUBEMAP_FACES)i, mip);
-                                                               }
-                                                               mip++;
-                                                       }
-                                               }
-                                       }
-                                       break;
-                               case GLTEXTURETYPE_RECTANGLE:
-                                       Sys_Error("Direct3D does not have RECTANGLE textures\n");
-                                       break;
                                }
+                               break;
                        }
-                       glt->d3daddressw = 0;
-                       if (glt->flags & TEXF_CLAMP)
-                       {
-                               glt->d3daddressu = D3DTADDRESS_CLAMP;
-                               glt->d3daddressv = D3DTADDRESS_CLAMP;
-                               if (glt->tiledepth > 1)
-                                       glt->d3daddressw = D3DTADDRESS_CLAMP;
-                       }
-                       else
-                       {
-                               glt->d3daddressu = D3DTADDRESS_WRAP;
-                               glt->d3daddressv = D3DTADDRESS_WRAP;
-                               if (glt->tiledepth > 1)
-                                       glt->d3daddressw = D3DTADDRESS_WRAP;
-                       }
-                       glt->d3dmipmaplodbias = 0;
-                       glt->d3dmaxmiplevel = 0;
-                       glt->d3dmaxmiplevelfilter = d3d_filter_nomip ? 0 : glt->d3dmaxmiplevel;
-                       if (glt->flags & TEXF_FORCELINEAR)
-                       {
-                               glt->d3dminfilter = D3DTEXF_LINEAR;
-                               glt->d3dmagfilter = D3DTEXF_LINEAR;
-                               glt->d3dmipfilter = D3DTEXF_POINT;
-                       }
-                       else if (glt->flags & TEXF_FORCENEAREST)
-                       {
-                               glt->d3dminfilter = D3DTEXF_POINT;
-                               glt->d3dmagfilter = D3DTEXF_POINT;
-                               glt->d3dmipfilter = D3DTEXF_POINT;
-                       }
-                       else if (glt->flags & TEXF_MIPMAP)
-                       {
-                               glt->d3dminfilter = d3d_filter_mipmin;
-                               glt->d3dmagfilter = d3d_filter_mipmag;
-                               glt->d3dmipfilter = d3d_filter_mipmix;
-                       }
-                       else
-                       {
-                               glt->d3dminfilter = d3d_filter_flatmin;
-                               glt->d3dmagfilter = d3d_filter_flatmag;
-                               glt->d3dmipfilter = d3d_filter_flatmix;
-                       }
-#endif
-                       break;
-               case RENDERPATH_D3D10:
-                       Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
-                       break;
-               case RENDERPATH_D3D11:
-                       Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
-                       break;
                }
+               glt->d3daddressw = 0;
+               if (glt->flags & TEXF_CLAMP)
+               {
+                       glt->d3daddressu = D3DTADDRESS_CLAMP;
+                       glt->d3daddressv = D3DTADDRESS_CLAMP;
+                       if (glt->tiledepth > 1)
+                               glt->d3daddressw = D3DTADDRESS_CLAMP;
+               }
+               else
+               {
+                       glt->d3daddressu = D3DTADDRESS_WRAP;
+                       glt->d3daddressv = D3DTADDRESS_WRAP;
+                       if (glt->tiledepth > 1)
+                               glt->d3daddressw = D3DTADDRESS_WRAP;
+               }
+               glt->d3dmipmaplodbias = 0;
+               glt->d3dmaxmiplevel = 0;
+               glt->d3dmaxmiplevelfilter = d3d_filter_nomip ? 0 : glt->d3dmaxmiplevel;
+               if (glt->flags & TEXF_FORCELINEAR)
+               {
+                       glt->d3dminfilter = D3DTEXF_LINEAR;
+                       glt->d3dmagfilter = D3DTEXF_LINEAR;
+                       glt->d3dmipfilter = D3DTEXF_POINT;
+               }
+               else if (glt->flags & TEXF_FORCENEAREST)
+               {
+                       glt->d3dminfilter = D3DTEXF_POINT;
+                       glt->d3dmagfilter = D3DTEXF_POINT;
+                       glt->d3dmipfilter = D3DTEXF_POINT;
+               }
+               else if (glt->flags & TEXF_MIPMAP)
+               {
+                       glt->d3dminfilter = d3d_filter_mipmin;
+                       glt->d3dmagfilter = d3d_filter_mipmag;
+                       glt->d3dmipfilter = d3d_filter_mipmix;
+               }
+               else
+               {
+                       glt->d3dminfilter = d3d_filter_flatmin;
+                       glt->d3dmagfilter = d3d_filter_flatmag;
+                       glt->d3dmipfilter = d3d_filter_flatmix;
+               }
+#endif
+               break;
+       case RENDERPATH_D3D10:
+               Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
+               break;
+       case RENDERPATH_D3D11:
+               Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
+               break;
        }
 }
 
@@ -1336,11 +1398,6 @@ static rtexture_t *R_SetupTexture(rtexturepool_t *rtexturepool, const char *iden
        if (cls.state == ca_dedicated)
                return NULL;
 
-       if (texturetype == GLTEXTURETYPE_RECTANGLE && !vid.support.arb_texture_rectangle)
-       {
-               Con_Printf ("R_LoadTexture: rectangle texture not supported by driver\n");
-               return NULL;
-       }
        if (texturetype == GLTEXTURETYPE_CUBEMAP && !vid.support.arb_texture_cube_map)
        {
                Con_Printf ("R_LoadTexture: cubemap texture not supported by driver\n");
@@ -1501,7 +1558,13 @@ static rtexture_t *R_SetupTexture(rtexturepool_t *rtexturepool, const char *iden
                        glt->d3dformat = d3dformat;
                        glt->d3dusage = d3dusage;
                        glt->d3dpool = d3dpool;
-                       if (glt->tiledepth > 1)
+                       glt->d3disdepthsurface = textype == TEXTYPE_SHADOWMAP;
+                       if (glt->d3disdepthsurface)
+                       {
+                               if (FAILED(d3dresult = IDirect3DDevice9_CreateDepthStencilSurface(vid_d3d9dev, glt->tilewidth, glt->tileheight, (D3DFORMAT)glt->d3dformat, D3DMULTISAMPLE_NONE, 0, false, (IDirect3DSurface9 **)&glt->d3dtexture, NULL)))
+                                       Sys_Error("IDirect3DDevice9_CreateDepthStencilSurface failed!");
+                       }
+                       else if (glt->tiledepth > 1)
                        {
                                if (FAILED(d3dresult = IDirect3DDevice9_CreateVolumeTexture(vid_d3d9dev, glt->tilewidth, glt->tileheight, glt->tiledepth, glt->miplevels, glt->d3dusage, (D3DFORMAT)glt->d3dformat, (D3DPOOL)glt->d3dpool, (IDirect3DVolumeTexture9 **)&glt->d3dtexture, NULL)))
                                        Sys_Error("IDirect3DDevice9_CreateVolumeTexture failed!");
@@ -1527,7 +1590,7 @@ static rtexture_t *R_SetupTexture(rtexturepool_t *rtexturepool, const char *iden
                break;
        }
 
-       R_Upload(glt, data, 0, 0, 0, glt->inputwidth, glt->inputheight, glt->inputdepth);
+       R_UploadFullTexture(glt, data);
        if ((glt->flags & TEXF_ALLOWUPDATES) && gl_nopartialtextureupdates.integer)
                glt->bufferpixels = (unsigned char *)Mem_Alloc(texturemempool, glt->tilewidth*glt->tileheight*glt->tiledepth*glt->sides*glt->bytesperpixel);
 
@@ -1557,11 +1620,6 @@ rtexture_t *R_LoadTextureCubeMap(rtexturepool_t *rtexturepool, const char *ident
        return R_SetupTexture(rtexturepool, identifier, width, width, 1, 6, flags, miplevel, textype, GLTEXTURETYPE_CUBEMAP, data, palette);
 }
 
-rtexture_t *R_LoadTextureRectangle(rtexturepool_t *rtexturepool, const char *identifier, int width, int height, const unsigned char *data, textype_t textype, int flags, int miplevel, const unsigned int *palette)
-{
-       return R_SetupTexture(rtexturepool, identifier, width, height, 1, 1, flags, miplevel, textype, GLTEXTURETYPE_RECTANGLE, data, palette);
-}
-
 static int R_ShadowMapTextureFlags(int precision, qboolean filter)
 {
        int flags = TEXF_RENDERTARGET | TEXF_CLAMP;
@@ -1574,22 +1632,12 @@ static int R_ShadowMapTextureFlags(int precision, qboolean filter)
        return flags;
 }
 
-rtexture_t *R_LoadTextureShadowMapRectangle(rtexturepool_t *rtexturepool, const char *identifier, int width, int height, int precision, qboolean filter)
-{
-       return R_SetupTexture(rtexturepool, identifier, width, height, 1, 1, R_ShadowMapTextureFlags(precision, filter), -1, TEXTYPE_SHADOWMAP, GLTEXTURETYPE_RECTANGLE, NULL, NULL);
-}
-
 rtexture_t *R_LoadTextureShadowMap2D(rtexturepool_t *rtexturepool, const char *identifier, int width, int height, int precision, qboolean filter)
 {
        return R_SetupTexture(rtexturepool, identifier, width, height, 1, 1, R_ShadowMapTextureFlags(precision, filter), -1, TEXTYPE_SHADOWMAP, GLTEXTURETYPE_2D, NULL, NULL);
 }
 
-rtexture_t *R_LoadTextureShadowMapCube(rtexturepool_t *rtexturepool, const char *identifier, int width, int precision, qboolean filter)
-{
-    return R_SetupTexture(rtexturepool, identifier, width, width, 1, 6, R_ShadowMapTextureFlags(precision, filter), -1, TEXTYPE_SHADOWMAP, GLTEXTURETYPE_CUBEMAP, NULL, NULL);
-}
-
-int R_SaveTextureDDSFile(rtexture_t *rt, const char *filename, qboolean skipuncompressed)
+int R_SaveTextureDDSFile(rtexture_t *rt, const char *filename, qboolean skipuncompressed, qboolean hasalpha)
 {
        gltexture_t *glt = (gltexture_t *)rt;
        unsigned char *dds;
@@ -1625,6 +1673,15 @@ int R_SaveTextureDDSFile(rtexture_t *rt, const char *filename, qboolean skipunco
        case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT: ddsfourcc = "DXT3";bytesperblock = 16;break;
        case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT: ddsfourcc = "DXT5";bytesperblock = 16;break;
        }
+       // if premultiplied alpha, say so in the DDS file
+       if(glt->flags & TEXF_RGBMULTIPLYBYALPHA)
+       {
+               switch(internalformat)
+               {
+                       case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT: ddsfourcc = "DXT2";break;
+                       case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT: ddsfourcc = "DXT4";break;
+               }
+       }
        if (!bytesperblock && skipuncompressed)
                return -3; // skipped
        memset(mipinfo, 0, sizeof(mipinfo));
@@ -1664,13 +1721,15 @@ int R_SaveTextureDDSFile(rtexture_t *rt, const char *filename, qboolean skipunco
        else
        {
                dds_flags = 0x100F; // DDSD_CAPS | DDSD_PIXELFORMAT | DDSD_WIDTH | DDSD_HEIGHT | DDSD_PITCH
-               dds_format_flags = 0x41; // DDPF_RGB | DDPF_ALPHAPIXELS
+               dds_format_flags = 0x40; // DDPF_RGB
        }
        if (mipmaps)
        {
                dds_flags |= 0x20000; // DDSD_MIPMAPCOUNT
                dds_caps1 |= 0x400008; // DDSCAPS_MIPMAP | DDSCAPS_COMPLEX
        }
+       if(hasalpha)
+               dds_format_flags |= 0x1; // DDPF_ALPHAPIXELS
        memcpy(dds, "DDS ", 4);
        StoreLittleLong(dds+4, ddssize);
        StoreLittleLong(dds+8, dds_flags);
@@ -1717,13 +1776,14 @@ rtexture_t *R_LoadTextureDDSFile(rtexturepool_t *rtexturepool, const char *filen
        gltexture_t *glt;
        gltexturepool_t *pool = (gltexturepool_t *)rtexturepool;
        textypeinfo_t *texinfo;
-       int mip, mipwidth, mipheight, mipsize;
+       int mip, mipwidth, mipheight, mipsize, mipsize_total;
        unsigned int c;
        GLint oldbindtexnum = 0;
-       const unsigned char *mippixels, *ddspixels;
+       const unsigned char *mippixels, *ddspixels, *mippixels_start;
        unsigned char *dds;
        fs_offset_t ddsfilesize;
        unsigned int ddssize;
+       qboolean force_swdecode = (r_texture_dds_swdecode.integer > 1);
 
        if (cls.state == ca_dedicated)
                return NULL;
@@ -1751,7 +1811,11 @@ rtexture_t *R_LoadTextureDDSFile(rtexturepool_t *rtexturepool, const char *filen
        dds_height = BuffLittleLong(dds+12);
        ddspixels = dds + 128;
 
-       flags &= ~TEXF_ALPHA;
+       if(r_texture_dds_load_alphamode.integer == 0)
+               if(!(dds_format_flags & 0x1)) // DDPF_ALPHAPIXELS
+                       flags &= ~TEXF_ALPHA;
+
+       //flags &= ~TEXF_ALPHA; // disabled, as we DISABLE TEXF_ALPHA in the alpha detection, not enable it!
        if ((dds_format_flags & 0x40) && BuffLittleLong(dds+88) == 32)
        {
                // very sloppy BGRA 32bit identification
@@ -1765,12 +1829,15 @@ rtexture_t *R_LoadTextureDDSFile(rtexturepool_t *rtexturepool, const char *filen
                        Con_Printf("^1%s: invalid BGRA DDS image\n", filename);
                        return NULL;
                }
-               // check alpha
-               for (i = 3;i < size;i += 4)
-                       if (ddspixels[i] < 255)
-                               break;
-               if (i >= size)
-                       flags &= ~TEXF_ALPHA;
+               if((r_texture_dds_load_alphamode.integer == 1) && (flags & TEXF_ALPHA))
+               {
+                       // check alpha
+                       for (i = 3;i < size;i += 4)
+                               if (ddspixels[i] < 255)
+                                       break;
+                       if (i >= size)
+                               flags &= ~TEXF_ALPHA;
+               }
        }
        else if (!memcmp(dds+84, "DXT1", 4))
        {
@@ -1788,16 +1855,47 @@ rtexture_t *R_LoadTextureDDSFile(rtexturepool_t *rtexturepool, const char *filen
                        Con_Printf("^1%s: invalid DXT1 DDS image\n", filename);
                        return NULL;
                }
-               for (i = 0;i < size;i += bytesperblock)
-                       if (ddspixels[i+0] + ddspixels[i+1] * 256 <= ddspixels[i+2] + ddspixels[i+3] * 256)
-                               break;
-               if (i < size)
-                       textype = TEXTYPE_DXT1A;
-               else
-                       flags &= ~TEXF_ALPHA;
+               if(r_texture_dds_load_alphamode.integer && (flags & TEXF_ALPHA))
+               {
+                       if(r_texture_dds_load_alphamode.integer == 1)
+                       {
+                               // check alpha
+                               for (i = 0;i < size;i += bytesperblock)
+                                       if (ddspixels[i+0] + ddspixels[i+1] * 256 <= ddspixels[i+2] + ddspixels[i+3] * 256)
+                                       {
+                                               // NOTE: this assumes sizeof(unsigned int) == 4
+                                               unsigned int data = * (unsigned int *) &(ddspixels[i+4]);
+                                               // check if data, in base 4, contains a digit 3 (DXT1: transparent pixel)
+                                               if(data & (data<<1) & 0xAAAAAAAA)//rgh
+                                                       break;
+                                       }
+                               if (i < size)
+                                       textype = TEXTYPE_DXT1A;
+                               else
+                                       flags &= ~TEXF_ALPHA;
+                       }
+                       else
+                       {
+                               flags &= ~TEXF_ALPHA;
+                       }
+               }
        }
-       else if (!memcmp(dds+84, "DXT3", 4))
+       else if (!memcmp(dds+84, "DXT3", 4) || !memcmp(dds+84, "DXT2", 4))
        {
+               if(!memcmp(dds+84, "DXT2", 4))
+               {
+                       if(!(flags & TEXF_RGBMULTIPLYBYALPHA))
+                       {
+                               Con_Printf("^1%s: expecting DXT3 image without premultiplied alpha, got DXT2 image with premultiplied alpha\n", filename);
+                       }
+               }
+               else
+               {
+                       if(flags & TEXF_RGBMULTIPLYBYALPHA)
+                       {
+                               Con_Printf("^1%s: expecting DXT2 image without premultiplied alpha, got DXT3 image without premultiplied alpha\n", filename);
+                       }
+               }
                textype = TEXTYPE_DXT3;
                bytesperblock = 16;
                bytesperpixel = 0;
@@ -1808,9 +1906,24 @@ rtexture_t *R_LoadTextureDDSFile(rtexturepool_t *rtexturepool, const char *filen
                        Con_Printf("^1%s: invalid DXT3 DDS image\n", filename);
                        return NULL;
                }
+               // we currently always assume alpha
        }
-       else if (!memcmp(dds+84, "DXT5", 4))
+       else if (!memcmp(dds+84, "DXT5", 4) || !memcmp(dds+84, "DXT4", 4))
        {
+               if(!memcmp(dds+84, "DXT4", 4))
+               {
+                       if(!(flags & TEXF_RGBMULTIPLYBYALPHA))
+                       {
+                               Con_Printf("^1%s: expecting DXT5 image without premultiplied alpha, got DXT4 image with premultiplied alpha\n", filename);
+                       }
+               }
+               else
+               {
+                       if(flags & TEXF_RGBMULTIPLYBYALPHA)
+                       {
+                               Con_Printf("^1%s: expecting DXT4 image without premultiplied alpha, got DXT5 image without premultiplied alpha\n", filename);
+                       }
+               }
                textype = TEXTYPE_DXT5;
                bytesperblock = 16;
                bytesperpixel = 0;
@@ -1821,6 +1934,7 @@ rtexture_t *R_LoadTextureDDSFile(rtexturepool_t *rtexturepool, const char *filen
                        Con_Printf("^1%s: invalid DXT5 DDS image\n", filename);
                        return NULL;
                }
+               // we currently always assume alpha
        }
        else
        {
@@ -1829,10 +1943,106 @@ rtexture_t *R_LoadTextureDDSFile(rtexturepool_t *rtexturepool, const char *filen
                return NULL;
        }
 
+       force_swdecode = false;
+       if(bytesperblock)
+       {
+               if(vid.support.arb_texture_compression && vid.support.ext_texture_compression_s3tc)
+               {
+                       if(r_texture_dds_swdecode.integer > 1)
+                               force_swdecode = true;
+               }
+               else
+               {
+                       if(r_texture_dds_swdecode.integer < 1)
+                       {
+                               // unsupported
+                               Mem_Free(dds);
+                               return NULL;
+                       }
+                       force_swdecode = true;
+               }
+       }
+
        // return whether this texture is transparent
        if (hasalphaflag)
                *hasalphaflag = (flags & TEXF_ALPHA) != 0;
 
+       // if we SW decode, choose 2 sizes bigger
+       if(force_swdecode)
+       {
+               // this is quarter res, so do not scale down more than we have to
+               miplevel -= 2;
+
+               if(miplevel < 0)
+                       Con_DPrintf("WARNING: fake software decoding of compressed texture %s degraded quality\n", filename);
+       }
+
+       // this is where we apply gl_picmip
+       mippixels_start = ddspixels;
+       mipwidth = dds_width;
+       mipheight = dds_height;
+       while(miplevel >= 1 && dds_miplevels >= 1)
+       {
+               if (mipwidth <= 1 && mipheight <= 1)
+                       break;
+               mipsize = bytesperblock ? ((mipwidth+3)/4)*((mipheight+3)/4)*bytesperblock : mipwidth*mipheight*bytesperpixel;
+               mippixels_start += mipsize; // just skip
+               --dds_miplevels;
+               --miplevel;
+               if (mipwidth > 1)
+                       mipwidth >>= 1;
+               if (mipheight > 1)
+                       mipheight >>= 1;
+       }
+       mipsize_total = ddssize - 128 - (mippixels_start - ddspixels);
+       mipsize = bytesperblock ? ((mipwidth+3)/4)*((mipheight+3)/4)*bytesperblock : mipwidth*mipheight*bytesperpixel;
+
+       // from here on, we do not need the ddspixels and ddssize any more (apart from the statistics entry in glt)
+
+       // fake decode S3TC if needed
+       if(force_swdecode)
+       {
+               int mipsize_new = mipsize_total / bytesperblock * 4;
+               unsigned char *mipnewpixels = (unsigned char *) Mem_Alloc(tempmempool, mipsize_new);
+               unsigned char *p = mipnewpixels;
+               for (i = bytesperblock == 16 ? 8 : 0;i < (int)mipsize_total;i += bytesperblock, p += 4)
+               {
+                       c = mippixels_start[i] + 256*mippixels_start[i+1] + 65536*mippixels_start[i+2] + 16777216*mippixels_start[i+3];
+                       p[2] = (((c >> 11) & 0x1F) + ((c >> 27) & 0x1F)) * (0.5f / 31.0f * 255.0f);
+                       p[1] = (((c >>  5) & 0x3F) + ((c >> 21) & 0x3F)) * (0.5f / 63.0f * 255.0f);
+                       p[0] = (((c      ) & 0x1F) + ((c >> 16) & 0x1F)) * (0.5f / 31.0f * 255.0f);
+                       if(textype == TEXTYPE_DXT5)
+                               p[3] = (0.5 * mippixels_start[i-8] + 0.5 * mippixels_start[i-7]);
+                       else if(textype == TEXTYPE_DXT3)
+                               p[3] = (
+                                         (mippixels_start[i-8] & 0x0F)
+                                       + (mippixels_start[i-8] >> 4)
+                                       + (mippixels_start[i-7] & 0x0F)
+                                       + (mippixels_start[i-7] >> 4)
+                                       + (mippixels_start[i-6] & 0x0F)
+                                       + (mippixels_start[i-6] >> 4)
+                                       + (mippixels_start[i-5] & 0x0F)
+                                       + (mippixels_start[i-5] >> 4)
+                                      ) * (0.125f / 15.0f * 255.0f);
+                       else
+                               p[3] = 255;
+               }
+
+               textype = TEXTYPE_BGRA;
+               bytesperblock = 0;
+               bytesperpixel = 4;
+
+               // as each block becomes a pixel, we must use pixel count for this
+               mipwidth = (mipwidth + 3) / 4;
+               mipheight = (mipheight + 3) / 4;
+               mipsize = bytesperpixel * mipwidth * mipheight;
+               mippixels_start = mipnewpixels;
+               mipsize_total = mipsize_new;
+       }
+
+       // start mip counting
+       mippixels = mippixels_start;
+
        // calculate average color if requested
        if (avgcolor)
        {
@@ -1840,27 +2050,31 @@ rtexture_t *R_LoadTextureDDSFile(rtexturepool_t *rtexturepool, const char *filen
                Vector4Clear(avgcolor);
                if (bytesperblock)
                {
-                       for (i = bytesperblock == 16 ? 8 : 0;i < size;i += bytesperblock)
+                       for (i = bytesperblock == 16 ? 8 : 0;i < mipsize;i += bytesperblock)
                        {
-                               c = ddspixels[i] + 256*ddspixels[i+1] + 65536*ddspixels[i+2] + 16777216*ddspixels[i+3];
+                               c = mippixels[i] + 256*mippixels[i+1] + 65536*mippixels[i+2] + 16777216*mippixels[i+3];
                                avgcolor[0] += ((c >> 11) & 0x1F) + ((c >> 27) & 0x1F);
                                avgcolor[1] += ((c >>  5) & 0x3F) + ((c >> 21) & 0x3F);
                                avgcolor[2] += ((c      ) & 0x1F) + ((c >> 16) & 0x1F);
+                               if(textype == TEXTYPE_DXT5)
+                                       avgcolor[3] = (0.5 * mippixels[i-8] + 0.5 * mippixels[i-7]);
+                               else
+                                       avgcolor[3] += 255;
                        }
                        f = (float)bytesperblock / size;
                        avgcolor[0] *= (0.5f / 31.0f) * f;
                        avgcolor[1] *= (0.5f / 63.0f) * f;
                        avgcolor[2] *= (0.5f / 31.0f) * f;
-                       avgcolor[3] = 1; // too hard to calculate
+                       avgcolor[3] *= f;
                }
                else
                {
-                       for (i = 0;i < size;i += 4)
+                       for (i = 0;i < mipsize;i += 4)
                        {
-                               avgcolor[0] += ddspixels[i+2];
-                               avgcolor[1] += ddspixels[i+1];
-                               avgcolor[2] += ddspixels[i];
-                               avgcolor[3] += ddspixels[i+3];
+                               avgcolor[0] += mippixels[i+2];
+                               avgcolor[1] += mippixels[i+1];
+                               avgcolor[2] += mippixels[i];
+                               avgcolor[3] += mippixels[i+3];
                        }
                        f = (1.0f / 255.0f) * bytesperpixel / size;
                        avgcolor[0] *= f;
@@ -1870,37 +2084,15 @@ rtexture_t *R_LoadTextureDDSFile(rtexturepool_t *rtexturepool, const char *filen
                }
        }
 
-       // this is where we apply gl_picmip
-       mippixels = ddspixels;
-       mipwidth = dds_width;
-       mipheight = dds_height;
-       while(miplevel >= 1 && dds_miplevels >= 1)
-       {
-               if (mipwidth <= 1 && mipheight <= 1)
-                       break;
-               mipsize = bytesperblock ? ((mipwidth+3)/4)*((mipheight+3)/4)*bytesperblock : mipwidth*mipheight*bytesperpixel;
-               mippixels += mipsize; // just skip
-               --dds_miplevels;
-               --miplevel;
-               if (mipwidth > 1)
-                       mipwidth >>= 1;
-               if (mipheight > 1)
-                       mipheight >>= 1;
-       }
+       // when not requesting mipmaps, do not load them
+       if(!(flags & TEXF_MIPMAP))
+               dds_miplevels = 0;
 
-       if (dds_miplevels > 1)
+       if (dds_miplevels >= 1)
                flags |= TEXF_MIPMAP;
        else
                flags &= ~TEXF_MIPMAP;
 
-       // if S3TC is not supported, there's very little we can do about it
-       if (bytesperblock && !vid.support.ext_texture_compression_s3tc)
-       {
-               Mem_Free(dds);
-               Con_Printf("^1%s: DDS file is compressed but OpenGL driver does not support S3TC\n", filename);
-               return NULL;
-       }
-
        texinfo = R_GetTexTypeInfo(textype, flags);
 
        glt = (gltexture_t *)Mem_ExpandableArray_AllocRecord(&texturearray);
@@ -1977,7 +2169,7 @@ rtexture_t *R_LoadTextureDDSFile(rtexturepool_t *rtexturepool, const char *filen
        for (mip = 0;mip <= dds_miplevels;mip++) // <= to include the not-counted "largest" miplevel
        {
                mipsize = bytesperblock ? ((mipwidth+3)/4)*((mipheight+3)/4)*bytesperblock : mipwidth*mipheight*bytesperpixel;
-               if (mippixels + mipsize > dds + ddssize)
+               if (mippixels + mipsize > mippixels_start + mipsize_total)
                        break;
                switch(vid.renderpath)
                {
@@ -2084,6 +2276,8 @@ rtexture_t *R_LoadTextureDDSFile(rtexturepool_t *rtexturepool, const char *filen
        }
 
        Mem_Free(dds);
+       if(force_swdecode)
+               Mem_Free((unsigned char *) mippixels_start);
        return (rtexture_t *)glt;
 }
 
@@ -2106,7 +2300,7 @@ void R_UpdateTexture(rtexture_t *rt, const unsigned char *data, int x, int y, in
                Host_Error("R_UpdateTexture: no texture supplied");
        if (!glt->texnum && !glt->d3dtexture)
        {
-               Con_Printf("R_UpdateTexture: texture %p \"%s\" in pool %p has not been uploaded yet", glt, glt->identifier, glt->pool);
+               Con_Printf("R_UpdateTexture: texture %p \"%s\" in pool %p has not been uploaded yet", (void *)glt, glt->identifier, (void *)glt->pool);
                return;
        }
        // update part of the texture
@@ -2142,8 +2336,10 @@ void R_UpdateTexture(rtexture_t *rt, const unsigned char *data, int x, int y, in
                for (j = 0;j < height;j++, output += outputskip, input += inputskip)
                        memcpy(output, input, width*bpp);
        }
+       else if (x || y || width != glt->inputwidth || height != glt->inputheight)
+               R_UploadPartialTexture(glt, data, x, y, 0, width, height, 1);
        else
-               R_Upload(glt, data, x, y, 0, width, height, 1);
+               R_UploadFullTexture(glt, data);
 }
 
 int R_RealGetTexture(rtexture_t *rt)
@@ -2157,7 +2353,7 @@ int R_RealGetTexture(rtexture_t *rt)
                if (glt->buffermodified && glt->bufferpixels)
                {
                        glt->buffermodified = false;
-                       R_Upload(glt, glt->bufferpixels, 0, 0, 0, glt->tilewidth, glt->tileheight, glt->tiledepth);
+                       R_UploadFullTexture(glt, glt->bufferpixels);
                }
                glt->dirty = false;
                return glt->texnum;
@@ -2170,7 +2366,7 @@ void R_ClearTexture (rtexture_t *rt)
 {
        gltexture_t *glt = (gltexture_t *)rt;
 
-       R_Upload( glt, NULL, 0, 0, 0, glt->tilewidth, glt->tileheight, glt->tiledepth );
+       R_UploadFullTexture(glt, NULL);
 }
 
 int R_PicmipForFlags(int flags)
@@ -2196,5 +2392,5 @@ int R_PicmipForFlags(int flags)
                else
                        miplevel += gl_picmip_other.integer;
        }
-       return miplevel;
+       return max(0, miplevel);
 }