X-Git-Url: http://de.git.xonotic.org/?p=xonotic%2Fdarkplaces.git;a=blobdiff_plain;f=gl_backend.c;h=c5fa542f4783654d115021070022080bcbb7d53c;hp=3e92f4bed53f7070d9ad2e392e5e0b9475cb12a9;hb=3bd4b0e091f90d0dc390b19b5b9bdde0b3d4b20a;hpb=51ff0537d076d438c3282aa9d866c549ac561ee9

diff --git a/gl_backend.c b/gl_backend.c
index 3e92f4be..c5fa542f 100644
--- a/gl_backend.c
+++ b/gl_backend.c
@@ -1,18 +1,15 @@
 
 #include "quakedef.h"
+#include "image.h"
 
-cvar_t gl_mesh_maxtriangles = {0, "gl_mesh_maxtriangles", "1024"};
+cvar_t gl_mesh_maxverts = {0, "gl_mesh_maxverts", "1024"};
 cvar_t gl_mesh_floatcolors = {0, "gl_mesh_floatcolors", "1"};
-cvar_t gl_mesh_drawmode = {CVAR_SAVE, "gl_mesh_drawmode", "3"};
+cvar_t gl_mesh_drawrangeelements = {0, "gl_mesh_drawrangeelements", "1"};
 
 cvar_t r_render = {0, "r_render", "1"};
 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1"}; // whether or not to use dithering
 cvar_t gl_lockarrays = {0, "gl_lockarrays", "1"};
 
-// this is used to increase gl_mesh_maxtriangles automatically if a mesh was
-// too large for the buffers in the previous frame
-int overflowedverts = 0;
-
 int gl_maxdrawrangeelementsvertices;
 int gl_maxdrawrangeelementsindices;
 
@@ -65,179 +62,135 @@ void GL_PrintError(int errornumber, char *filename, int linenumber)
 }
 #endif
 
-float r_mesh_farclip;
-
-static float viewdist;
-// sign bits (true if negative) for vpn[] entries, so quick integer compares can be used instead of float compares
-static int vpnbit0, vpnbit1, vpnbit2;
+#define BACKENDACTIVECHECK if (!backendactive) Sys_Error("GL backend function called when backend is not active\n");
 
-int c_meshs, c_meshtris;
-
-int lightscalebit;
-float lightscale;
-float overbrightscale;
+int c_meshs, c_meshelements;
 
 void SCR_ScreenShot_f (void);
 
-static int max_tris;
-static int max_verts; // always max_tris * 3
+// these are externally accessible
+int r_lightmapscalebit;
+float r_colorscale;
+float *varray_vertex;
+float *varray_color;
+float *varray_texcoord[MAX_TEXTUREUNITS];
+int mesh_maxverts;
+
+static matrix4x4_t backend_viewmatrix;
+static matrix4x4_t backend_modelmatrix;
+static matrix4x4_t backend_modelviewmatrix;
+static matrix4x4_t backend_glmodelviewmatrix;
+static matrix4x4_t backend_projectmatrix;
+
+static int backendunits, backendactive;
+static qbyte *varray_bcolor;
+static mempool_t *gl_backend_mempool;
 
-typedef struct buf_mesh_s
-{
-	int depthmask;
-	int depthtest;
-	int blendfunc1, blendfunc2;
-	int textures[MAX_TEXTUREUNITS];
-	int texturergbscale[MAX_TEXTUREUNITS];
-	int firsttriangle;
-	int triangles;
-	int firstvert;
-	int verts;
-	matrix4x4_t matrix;
-	struct buf_mesh_s *chain;
-}
-buf_mesh_t;
+/*
+note: here's strip order for a terrain row:
+0--1--2--3--4
+|\ |\ |\ |\ |
+| \| \| \| \|
+A--B--C--D--E
+
+A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
+
+*elements++ = i + row;
+*elements++ = i;
+*elements++ = i + row + 1;
+*elements++ = i;
+*elements++ = i + 1;
+*elements++ = i + row + 1;
+*/
 
-typedef struct buf_tri_s
-{
-	int index[3];
-}
-buf_tri_t;
+int polygonelements[768];
 
-typedef struct
+void GL_Backend_AllocArrays(void)
 {
-	float v[4];
-}
-buf_vertex_t;
+	int i;
 
-typedef struct
-{
-	float c[4];
-}
-buf_fcolor_t;
+	for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
+	{
+		polygonelements[i * 3 + 0] = 0;
+		polygonelements[i * 3 + 1] = i + 1;
+		polygonelements[i * 3 + 2] = i + 2;
+	}
 
-typedef struct
-{
-	qbyte c[4];
+	if (!gl_backend_mempool)
+		gl_backend_mempool = Mem_AllocPool("GL_Backend");
+
+	varray_vertex = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
+	varray_color = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
+	varray_bcolor = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(qbyte[4]));
+	for (i = 0;i < backendunits;i++)
+		varray_texcoord[i] = Mem_Alloc(gl_backend_mempool, mesh_maxverts * sizeof(float[4]));
+	for (;i < MAX_TEXTUREUNITS;i++)
+		varray_texcoord[i] = NULL;
 }
-buf_bcolor_t;
 
-typedef struct
+void GL_Backend_FreeArrays(int resizingbuffers)
 {
-	float t[2];
+	int i;
+	if (resizingbuffers)
+		Mem_EmptyPool(gl_backend_mempool);
+	else
+		Mem_FreePool(&gl_backend_mempool);
+	varray_vertex = NULL;
+	varray_color = NULL;
+	varray_bcolor = NULL;
+	for (i = 0;i < MAX_TEXTUREUNITS;i++)
+		varray_texcoord[i] = NULL;
 }
-buf_texcoord_t;
-
-static int currenttriangle, currentvertex, backendunits, backendactive;
-static buf_mesh_t buf_mesh;
-static buf_tri_t *buf_tri;
-static buf_vertex_t *buf_vertex;
-static buf_fcolor_t *buf_fcolor;
-static buf_bcolor_t *buf_bcolor;
-static buf_texcoord_t *buf_texcoord[MAX_TEXTUREUNITS];
-
-static mempool_t *gl_backend_mempool;
-static int resizingbuffers = false;
 
 static void gl_backend_start(void)
 {
-	int i;
-
-	qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
-	qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
-
-	Con_Printf("OpenGL Backend started with gl_mesh_maxtriangles %i\n", gl_mesh_maxtriangles.integer);
+	Con_Printf("OpenGL Backend started with gl_mesh_maxverts %i\n", gl_mesh_maxverts.integer);
 	if (qglDrawRangeElements != NULL)
+	{
+		qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
+		qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
+		CHECKGLERROR
 		Con_Printf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
+	}
 	if (strstr(gl_renderer, "3Dfx"))
 	{
 		Con_Printf("3Dfx driver detected, forcing gl_mesh_floatcolors to 0 to prevent crashs\n");
 		Cvar_SetValueQuick(&gl_mesh_floatcolors, 0);
 	}
-	Con_Printf("\n");
-
-	max_verts = max_tris * 3;
 
-	if (!gl_backend_mempool)
-		gl_backend_mempool = Mem_AllocPool("GL_Backend");
-
-#define BACKENDALLOC(var, count, sizeofstruct, varname)\
-	{\
-		var = Mem_Alloc(gl_backend_mempool, count * sizeof(sizeofstruct));\
-		if (var == NULL)\
-			Sys_Error("gl_backend_start: unable to allocate memory for %s (%d bytes)\n", (varname), count * sizeof(sizeofstruct));\
-		memset(var, 0, count * sizeof(sizeofstruct));\
-	}
+	backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 
-	BACKENDALLOC(buf_tri, max_tris, buf_tri_t, "buf_tri")
-	BACKENDALLOC(buf_vertex, max_verts, buf_vertex_t, "buf_vertex")
-	BACKENDALLOC(buf_fcolor, max_verts, buf_fcolor_t, "buf_fcolor")
-	BACKENDALLOC(buf_bcolor, max_verts, buf_bcolor_t, "buf_bcolor")
+	GL_Backend_AllocArrays();
 
-	for (i = 0;i < MAX_TEXTUREUNITS;i++)
-	{
-		// only allocate as many texcoord arrays as we need
-		if (i < gl_textureunits)
-		{
-			BACKENDALLOC(buf_texcoord[i], max_verts, buf_texcoord_t, va("buf_texcoord[%d]", i))
-		}
-		else
-		{
-			buf_texcoord[i] = NULL;
-		}
-	}
-	backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 	backendactive = true;
 }
 
 static void gl_backend_shutdown(void)
 {
-	Con_Printf("OpenGL Backend shutting down\n");
-
-	if (resizingbuffers)
-		Mem_EmptyPool(gl_backend_mempool);
-	else
-		Mem_FreePool(&gl_backend_mempool);
-
 	backendunits = 0;
 	backendactive = false;
-}
 
-static void gl_backend_bufferchanges(int init)
-{
-	if (overflowedverts > gl_mesh_maxtriangles.integer * 3)
-		Cvar_SetValueQuick(&gl_mesh_maxtriangles, (int) ((overflowedverts + 2) / 3));
-	overflowedverts = 0;
-
-	if (gl_mesh_drawmode.integer < 0)
-		Cvar_SetValueQuick(&gl_mesh_drawmode, 0);
-	if (gl_mesh_drawmode.integer > 3)
-		Cvar_SetValueQuick(&gl_mesh_drawmode, 3);
+	Con_Printf("OpenGL Backend shutting down\n");
 
-	if (gl_mesh_drawmode.integer >= 3 && qglDrawRangeElements == NULL)
-	{
-		// change drawmode 3 to 2 if 3 won't work at all
-		Cvar_SetValueQuick(&gl_mesh_drawmode, 2);
-	}
+	GL_Backend_FreeArrays(false);
+}
 
+void GL_Backend_CheckCvars(void)
+{
 	// 21760 is (65536 / 3) rounded off to a multiple of 128
-	if (gl_mesh_maxtriangles.integer < 1024)
-		Cvar_SetValueQuick(&gl_mesh_maxtriangles, 1024);
-	if (gl_mesh_maxtriangles.integer > 21760)
-		Cvar_SetValueQuick(&gl_mesh_maxtriangles, 21760);
-
-	if (max_tris != gl_mesh_maxtriangles.integer)
-	{
-		max_tris = gl_mesh_maxtriangles.integer;
+	if (gl_mesh_maxverts.integer < 1024)
+		Cvar_SetValueQuick(&gl_mesh_maxverts, 1024);
+	if (gl_mesh_maxverts.integer > 21760)
+		Cvar_SetValueQuick(&gl_mesh_maxverts, 21760);
+}
 
-		if (!init)
-		{
-			resizingbuffers = true;
-			gl_backend_shutdown();
-			gl_backend_start();
-			resizingbuffers = false;
-		}
-	}
+void GL_Backend_ResizeArrays(int numtriangles)
+{
+	Cvar_SetValueQuick(&gl_mesh_maxverts, numtriangles);
+	GL_Backend_CheckCvars();
+	mesh_maxverts = gl_mesh_maxverts.integer;
+	GL_Backend_FreeArrays(true);
+	GL_Backend_AllocArrays();
 }
 
 static void gl_backend_newmap(void)
@@ -253,88 +206,130 @@ void gl_backend_init(void)
 	Cvar_SetValue("r_render", 0);
 #endif
 
-	Cvar_RegisterVariable(&gl_mesh_maxtriangles);
+	Cvar_RegisterVariable(&gl_mesh_maxverts);
 	Cvar_RegisterVariable(&gl_mesh_floatcolors);
-	Cvar_RegisterVariable(&gl_mesh_drawmode);
+	Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
+	GL_Backend_CheckCvars();
 	R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
-	gl_backend_bufferchanges(true);
 }
 
-int arraylocked = false;
+void GL_SetupView_ViewPort (int x, int y, int width, int height)
+{
+	if (!r_render.integer)
+		return;
 
-void GL_LockArray(int first, int count)
+	// y is weird beause OpenGL is bottom to top, we use top to bottom
+	qglViewport(x, vid.realheight - (y + height), width, height);
+	CHECKGLERROR
+}
+
+void GL_SetupView_Orientation_Identity (void)
 {
-	if (!arraylocked && gl_supportslockarrays && gl_lockarrays.integer && gl_mesh_drawmode.integer > 0)
-	{
-		qglLockArraysEXT(first, count);
-		CHECKGLERROR
-		arraylocked = true;
-	}
+	Matrix4x4_CreateIdentity(&backend_viewmatrix);
+	memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 }
 
-void GL_UnlockArray(void)
+void GL_SetupView_Orientation_FromEntity (vec3_t origin, vec3_t angles)
 {
-	if (arraylocked)
-	{
-		qglUnlockArraysEXT();
-		CHECKGLERROR
-		arraylocked = false;
-	}
+	Matrix4x4_CreateRotate(&backend_viewmatrix, -90, 1, 0, 0);
+	Matrix4x4_ConcatRotate(&backend_viewmatrix, 90, 0, 0, 1);
+	Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[2], 1, 0, 0);
+	Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[0], 0, 1, 0);
+	Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[1], 0, 0, 1);
+	Matrix4x4_ConcatTranslate(&backend_viewmatrix, -origin[0], -origin[1], -origin[2]);
+	memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 }
 
-/*
-=============
-GL_SetupFrame
-=============
-*/
-static void GL_SetupFrame (void)
+void GL_SetupView_Mode_Perspective (double fovx, double fovy, double zNear, double zFar)
 {
 	double xmax, ymax;
-	double fovx, fovy, zNear, zFar, aspect;
 
 	if (!r_render.integer)
 		return;
 
-	qglDepthFunc (GL_LEQUAL);CHECKGLERROR
-
 	// set up viewpoint
 	qglMatrixMode(GL_PROJECTION);CHECKGLERROR
-	qglLoadIdentity ();CHECKGLERROR
-
-	// y is weird beause OpenGL is bottom to top, we use top to bottom
-	qglViewport(r_refdef.x, vid.realheight - (r_refdef.y + r_refdef.height), r_refdef.width, r_refdef.height);CHECKGLERROR
-
-	// depth range
-	zNear = 1.0;
-	zFar = r_mesh_farclip;
-	if (zFar < 64)
-		zFar = 64;
-
-	// fov angles
-	fovx = r_refdef.fov_x;
-	fovy = r_refdef.fov_y;
-	aspect = r_refdef.width / r_refdef.height;
-
+	qglLoadIdentity();CHECKGLERROR
 	// pyramid slopes
-	xmax = zNear * tan(fovx * M_PI / 360.0) * aspect;
+	xmax = zNear * tan(fovx * M_PI / 360.0);
 	ymax = zNear * tan(fovy * M_PI / 360.0);
-
 	// set view pyramid
 	qglFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
+	qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
+	GL_SetupView_Orientation_Identity();
+}
+
+void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double fovx, double fovy, double zNear)
+{
+	float nudge, m[16];
+
+	if (!r_render.integer)
+		return;
 
+	// set up viewpoint
+	qglMatrixMode(GL_PROJECTION);CHECKGLERROR
+	qglLoadIdentity();CHECKGLERROR
+	// set view pyramid
+	nudge = 1.0 - 1.0 / (1<<23);
+	m[ 0] = 1.0 / tan(fovx * M_PI / 360.0);
+	m[ 1] = 0;
+	m[ 2] = 0;
+	m[ 3] = 0;
+	m[ 4] = 0;
+	m[ 5] = 1.0 / tan(fovy * M_PI / 360.0);
+	m[ 6] = 0;
+	m[ 7] = 0;
+	m[ 8] = 0;
+	m[ 9] = 0;
+	m[10] = -1 * nudge;
+	m[11] = -1 * nudge;
+	m[12] = 0;
+	m[13] = 0;
+	m[14] = -2 * zNear * nudge;
+	m[15] = 0;
+	qglLoadMatrixf(m);
 	qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
-	qglLoadIdentity ();CHECKGLERROR
+	GL_SetupView_Orientation_Identity();
+	backend_projectmatrix.m[0][0] = m[0];
+	backend_projectmatrix.m[1][0] = m[1];
+	backend_projectmatrix.m[2][0] = m[2];
+	backend_projectmatrix.m[3][0] = m[3];
+	backend_projectmatrix.m[0][1] = m[4];
+	backend_projectmatrix.m[1][1] = m[5];
+	backend_projectmatrix.m[2][1] = m[6];
+	backend_projectmatrix.m[3][1] = m[7];
+	backend_projectmatrix.m[0][2] = m[8];
+	backend_projectmatrix.m[1][2] = m[9];
+	backend_projectmatrix.m[2][2] = m[10];
+	backend_projectmatrix.m[3][2] = m[11];
+	backend_projectmatrix.m[0][3] = m[12];
+	backend_projectmatrix.m[1][3] = m[13];
+	backend_projectmatrix.m[2][3] = m[14];
+	backend_projectmatrix.m[3][3] = m[15];
+}
 
-	// put Z going up
-	qglRotatef (-90,  1, 0, 0);CHECKGLERROR
-	qglRotatef (90,  0, 0, 1);CHECKGLERROR
-	// camera rotation
-	qglRotatef (-r_refdef.viewangles[2],  1, 0, 0);CHECKGLERROR
-	qglRotatef (-r_refdef.viewangles[0],  0, 1, 0);CHECKGLERROR
-	qglRotatef (-r_refdef.viewangles[1],  0, 0, 1);CHECKGLERROR
-	// camera location
-	qglTranslatef (-r_refdef.vieworg[0],  -r_refdef.vieworg[1],  -r_refdef.vieworg[2]);CHECKGLERROR
+void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
+{
+	if (!r_render.integer)
+		return;
+
+	// set up viewpoint
+	qglMatrixMode(GL_PROJECTION);CHECKGLERROR
+	qglLoadIdentity();CHECKGLERROR
+	qglOrtho(x1, x2, y2, y1, zNear, zFar);
+	qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
+	GL_SetupView_Orientation_Identity();
+}
+
+typedef struct gltextureunit_s
+{
+	int t1d, t2d, t3d, tcubemap;
+	int arrayenabled;
+	float rgbscale, alphascale;
+	int combinergb, combinealpha;
+	// FIXME: add more combine stuff
 }
+gltextureunit_t;
 
 static struct
 {
@@ -342,170 +337,162 @@ static struct
 	int blendfunc2;
 	int blend;
 	GLboolean depthmask;
-	int depthtest;
+	int depthdisable;
 	int unit;
 	int clientunit;
-	int texture[MAX_TEXTUREUNITS];
-	float texturergbscale[MAX_TEXTUREUNITS];
+	gltextureunit_t units[MAX_TEXTUREUNITS];
+	int colorarray;
 }
 gl_state;
 
 void GL_SetupTextureState(void)
 {
 	int i;
-	if (backendunits > 1)
+	gltextureunit_t *unit;
+	for (i = 0;i < backendunits;i++)
 	{
-		for (i = 0;i < backendunits;i++)
-		{
+		if (qglActiveTexture)
 			qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
-			qglBindTexture(GL_TEXTURE_2D, gl_state.texture[i]);CHECKGLERROR
-			if (gl_combine.integer)
-			{
-				qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, gl_state.texturergbscale[i]);CHECKGLERROR
-				qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
-			}
-			else
-			{
-				qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
-			}
-			if (gl_state.texture[i])
-			{
-				qglEnable(GL_TEXTURE_2D);CHECKGLERROR
-			}
-			else
-			{
-				qglDisable(GL_TEXTURE_2D);CHECKGLERROR
-			}
-			if (gl_mesh_drawmode.integer > 0)
-			{
-				qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
-				qglTexCoordPointer(2, GL_FLOAT, sizeof(buf_texcoord_t), buf_texcoord[i]);CHECKGLERROR
-				if (gl_state.texture[i])
-				{
-					qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
-				}
-				else
-				{
-					qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
-				}
-			}
-		}
-	}
-	else
-	{
-		qglBindTexture(GL_TEXTURE_2D, gl_state.texture[0]);CHECKGLERROR
-		qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
-		if (gl_state.texture[0])
+		if (qglClientActiveTexture)
+			qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
+		unit = gl_state.units + i;
+		unit->t1d = 0;
+		unit->t2d = 0;
+		unit->t3d = 0;
+		unit->tcubemap = 0;
+		unit->rgbscale = 1;
+		unit->alphascale = 1;
+		unit->combinergb = GL_MODULATE;
+		unit->combinealpha = GL_MODULATE;
+		unit->arrayenabled = false;
+		qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
+		if (gl_texture3d || gl_texturecubemap)
 		{
-			qglEnable(GL_TEXTURE_2D);CHECKGLERROR
+			qglTexCoordPointer(3, GL_FLOAT, sizeof(float[4]), varray_texcoord[i]);CHECKGLERROR
 		}
 		else
 		{
-			qglDisable(GL_TEXTURE_2D);CHECKGLERROR
+			qglTexCoordPointer(2, GL_FLOAT, sizeof(float[4]), varray_texcoord[i]);CHECKGLERROR
 		}
-		if (gl_mesh_drawmode.integer > 0)
+		qglDisable(GL_TEXTURE_1D);CHECKGLERROR
+		qglDisable(GL_TEXTURE_2D);CHECKGLERROR
+		if (gl_texture3d)
 		{
-			qglTexCoordPointer(2, GL_FLOAT, sizeof(buf_texcoord_t), buf_texcoord[0]);CHECKGLERROR
-			if (gl_state.texture[0])
-			{
-				qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
-			}
-			else
-			{
-				qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
-			}
+			qglDisable(GL_TEXTURE_3D);CHECKGLERROR
+		}
+		if (gl_texturecubemap)
+		{
+			qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
+		}
+		if (gl_combine.integer)
+		{
+			qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
+		}
+		else
+		{
+			qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 		}
 	}
 }
 
-// called at beginning of frame
-int usedarrays;
-void R_Mesh_Start(float farclip)
+void GL_Backend_ResetState(void)
 {
-	int i;
-	if (!backendactive)
-		Sys_Error("R_Mesh_Clear: called when backend is not active\n");
-
-	CHECKGLERROR
-
-	gl_backend_bufferchanges(false);
-
-	currenttriangle = 0;
-	currentvertex = 0;
-	r_mesh_farclip = farclip;
-	viewdist = DotProduct(r_origin, vpn);
-	vpnbit0 = vpn[0] < 0;
-	vpnbit1 = vpn[1] < 0;
-	vpnbit2 = vpn[2] < 0;
-
-	c_meshs = 0;
-	c_meshtris = 0;
-
-	GL_SetupFrame();
-
-	gl_state.unit = 0;
-	gl_state.clientunit = 0;
+	memset(&gl_state, 0, sizeof(gl_state));
+	gl_state.depthdisable = false;
+	gl_state.blendfunc1 = GL_ONE;
+	gl_state.blendfunc2 = GL_ZERO;
+	gl_state.blend = false;
+	gl_state.depthmask = GL_TRUE;
+	gl_state.colorarray = false;
 
-	for (i = 0;i < backendunits;i++)
-	{
-		gl_state.texture[i] = 0;
-		gl_state.texturergbscale[i] = 1;
-	}
+	qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
+	qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 
 	qglEnable(GL_CULL_FACE);CHECKGLERROR
 	qglCullFace(GL_FRONT);CHECKGLERROR
-
-	gl_state.depthtest = true;
 	qglEnable(GL_DEPTH_TEST);CHECKGLERROR
-
-	gl_state.blendfunc1 = GL_ONE;
-	gl_state.blendfunc2 = GL_ZERO;
 	qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
-
-	gl_state.blend = 0;
 	qglDisable(GL_BLEND);CHECKGLERROR
-
-	gl_state.depthmask = GL_TRUE;
 	qglDepthMask(gl_state.depthmask);CHECKGLERROR
+	qglVertexPointer(3, GL_FLOAT, sizeof(float[4]), varray_vertex);CHECKGLERROR
+	qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
+	if (gl_mesh_floatcolors.integer)
+	{
+		qglColorPointer(4, GL_FLOAT, sizeof(float[4]), varray_color);CHECKGLERROR
+	}
+	else
+	{
+		qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(qbyte[4]), varray_bcolor);CHECKGLERROR
+	}
+	GL_Color(1, 1, 1, 1);
 
-	usedarrays = false;
-	if (gl_mesh_drawmode.integer > 0)
+	GL_SetupTextureState();
+}
+
+void GL_UseColorArray(void)
+{
+	if (!gl_state.colorarray)
 	{
-		usedarrays = true;
-		qglVertexPointer(3, GL_FLOAT, sizeof(buf_vertex_t), &buf_vertex[0].v[0]);CHECKGLERROR
-		qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
-		if (gl_mesh_floatcolors.integer)
-		{
-			qglColorPointer(4, GL_FLOAT, sizeof(buf_fcolor_t), &buf_fcolor[0].c[0]);CHECKGLERROR
-		}
-		else
-		{
-			qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(buf_bcolor_t), &buf_bcolor[0].c[0]);CHECKGLERROR
-		}
+		gl_state.colorarray = true;
 		qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 	}
+}
 
-	GL_SetupTextureState();
+void GL_Color(float cr, float cg, float cb, float ca)
+{
+	if (gl_state.colorarray)
+	{
+		gl_state.colorarray = false;
+		qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
+	}
+	qglColor4f(cr, cg, cb, ca);
+}
+
+void GL_TransformToScreen(const vec4_t in, vec4_t out)
+{
+	vec4_t temp;
+	float iw;
+	Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
+	Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
+	iw = 1.0f / out[3];
+	out[0] = r_refdef.x + (out[0] * iw + 1.0f) * r_refdef.width * 0.5f;
+	out[1] = r_refdef.y + (out[1] * iw + 1.0f) * r_refdef.height * 0.5f;
+	out[2] = out[2] * iw;
+}
+
+// called at beginning of frame
+void R_Mesh_Start(void)
+{
+	BACKENDACTIVECHECK
+
+	CHECKGLERROR
+
+	GL_Backend_CheckCvars();
+	if (mesh_maxverts != gl_mesh_maxverts.integer)
+		GL_Backend_ResizeArrays(gl_mesh_maxverts.integer);
+
+	GL_Backend_ResetState();
 }
 
 int gl_backend_rebindtextures;
 
-void GL_ConvertColorsFloatToByte(void)
+void GL_ConvertColorsFloatToByte(int numverts)
 {
 	int i, k, total;
 	// LordHavoc: to avoid problems with aliasing (treating memory as two
@@ -515,10 +502,10 @@ void GL_ConvertColorsFloatToByte(void)
 	volatile float *fcolor;
 	qbyte *bcolor;
 
-	total = currentvertex * 4;
+	total = numverts * 4;
 
 	// shift float to have 8bit fraction at base of number
-	fcolor = &buf_fcolor->c[0];
+	fcolor = varray_color;
 	for (i = 0;i < total;)
 	{
 		fcolor[i    ] += 32768.0f;
@@ -529,8 +516,8 @@ void GL_ConvertColorsFloatToByte(void)
 	}
 
 	// then read as integer and kill float bits...
-	icolor = (int *)&buf_fcolor->c[0];
-	bcolor = &buf_bcolor->c[0];
+	icolor = (int *)varray_color;
+	bcolor = varray_bcolor;
 	for (i = 0;i < total;)
 	{
 		k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (qbyte) k;
@@ -541,75 +528,110 @@ void GL_ConvertColorsFloatToByte(void)
 	}
 }
 
-void GL_MeshState(void)
+// enlarges geometry buffers if they are too small
+void _R_Mesh_ResizeCheck(int numverts)
 {
-	int i;
-	if (backendunits > 1)
+	if (numverts > mesh_maxverts)
 	{
-		for (i = 0;i < backendunits;i++)
-		{
-			if (gl_state.texture[i] != buf_mesh.textures[i])
-			{
-				if (gl_state.unit != i)
-				{
-					qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
-				}
-				if (gl_state.texture[i] == 0)
-				{
-					qglEnable(GL_TEXTURE_2D);CHECKGLERROR
-					// have to disable texcoord array on disabled texture
-					// units due to NVIDIA driver bug with
-					// compiled_vertex_array
-					if (gl_state.clientunit != i)
-					{
-						qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
-					}
-					qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
-				}
-				qglBindTexture(GL_TEXTURE_2D, (gl_state.texture[i] = buf_mesh.textures[i]));CHECKGLERROR
-				if (gl_state.texture[i] == 0)
-				{
-					qglDisable(GL_TEXTURE_2D);CHECKGLERROR
-					// have to disable texcoord array on disabled texture
-					// units due to NVIDIA driver bug with
-					// compiled_vertex_array
-					if (gl_state.clientunit != i)
-					{
-						qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
-					}
-					qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
-				}
-			}
-			if (gl_state.texturergbscale[i] != buf_mesh.texturergbscale[i])
-			{
-				if (gl_state.unit != i)
-				{
-					qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
-				}
-				qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.texturergbscale[i] = buf_mesh.texturergbscale[i]));CHECKGLERROR
-			}
-		}
+		BACKENDACTIVECHECK
+		GL_Backend_ResizeArrays(numverts + 100);
+		GL_Backend_ResetState();
+	}
+}
+
+// renders the mesh
+void R_Mesh_Draw(int numverts, int numtriangles, const int *elements)
+{
+	int numelements;
+	if (numtriangles == 0 || numverts == 0)
+	{
+		Con_Printf("R_Mesh_Draw(%d, %d, %08p);\n", numverts, numtriangles, elements);
+		return;
+	}
+	numelements = numtriangles * 3;
+	c_meshs++;
+	c_meshelements += numelements;
+	if (gl_state.colorarray && !gl_mesh_floatcolors.integer)
+		GL_ConvertColorsFloatToByte(numverts);
+	if (!r_render.integer)
+		return;
+	if (gl_supportslockarrays && gl_lockarrays.integer)
+	{
+		qglLockArraysEXT(0, numverts);
+		CHECKGLERROR
+		if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
+			qglDrawRangeElements(GL_TRIANGLES, 0, numverts, numelements, GL_UNSIGNED_INT, (const GLuint *) elements);
+		else
+			qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (const GLuint *) elements);
+		CHECKGLERROR
+		qglUnlockArraysEXT();
+		CHECKGLERROR
 	}
 	else
 	{
-		if (gl_state.texture[0] != buf_mesh.textures[0])
+		qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (const GLuint *) elements);
+		CHECKGLERROR
+	}
+}
+
+// restores backend state, used when done with 3D rendering
+void R_Mesh_Finish(void)
+{
+	int i;
+	BACKENDACTIVECHECK
+
+	for (i = backendunits - 1;i >= 0;i--)
+	{
+		if (qglActiveTexture)
+			qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
+		if (qglClientActiveTexture)
+			qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
+		qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
+		qglDisable(GL_TEXTURE_1D);CHECKGLERROR
+		qglDisable(GL_TEXTURE_2D);CHECKGLERROR
+		if (gl_texture3d)
 		{
-			if (gl_state.texture[0] == 0)
-			{
-				qglEnable(GL_TEXTURE_2D);CHECKGLERROR
-				qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
-			}
-			qglBindTexture(GL_TEXTURE_2D, (gl_state.texture[0] = buf_mesh.textures[0]));CHECKGLERROR
-			if (gl_state.texture[0] == 0)
-			{
-				qglDisable(GL_TEXTURE_2D);CHECKGLERROR
-				qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
-			}
+			qglDisable(GL_TEXTURE_3D);CHECKGLERROR
+		}
+		if (gl_texturecubemap)
+		{
+			qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
+		}
+		qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
+		if (gl_combine.integer)
+		{
+			qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
+			qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 		}
 	}
-	if (gl_state.blendfunc1 != buf_mesh.blendfunc1 || gl_state.blendfunc2 != buf_mesh.blendfunc2)
+	qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
+	qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
+
+	qglDisable(GL_BLEND);CHECKGLERROR
+	qglEnable(GL_DEPTH_TEST);CHECKGLERROR
+	qglDepthMask(GL_TRUE);CHECKGLERROR
+	qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
+}
+
+void R_Mesh_Matrix(const matrix4x4_t *matrix)
+{
+	if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
+	{
+		backend_modelmatrix = *matrix;
+		Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
+		Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
+		qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
+	}
+}
+
+// sets up the requested state
+void R_Mesh_MainState(const rmeshstate_t *m)
+{
+	BACKENDACTIVECHECK
+
+	if (gl_state.blendfunc1 != m->blendfunc1 || gl_state.blendfunc2 != m->blendfunc2)
 	{
-		qglBlendFunc(gl_state.blendfunc1 = buf_mesh.blendfunc1, gl_state.blendfunc2 = buf_mesh.blendfunc2);CHECKGLERROR
+		qglBlendFunc(gl_state.blendfunc1 = m->blendfunc1, gl_state.blendfunc2 = m->blendfunc2);CHECKGLERROR
 		if (gl_state.blendfunc2 == GL_ZERO)
 		{
 			if (gl_state.blendfunc1 == GL_ONE)
@@ -638,96 +660,27 @@ void GL_MeshState(void)
 			}
 		}
 	}
-	if (gl_state.depthtest != buf_mesh.depthtest)
+	if (gl_state.depthdisable != m->depthdisable)
 	{
-		gl_state.depthtest = buf_mesh.depthtest;
-		if (gl_state.depthtest)
-			qglEnable(GL_DEPTH_TEST);
-		else
+		gl_state.depthdisable = m->depthdisable;
+		if (gl_state.depthdisable)
 			qglDisable(GL_DEPTH_TEST);
+		else
+			qglEnable(GL_DEPTH_TEST);
 	}
-	if (gl_state.depthmask != buf_mesh.depthmask)
-	{
-		qglDepthMask(gl_state.depthmask = buf_mesh.depthmask);CHECKGLERROR
-	}
-}
-
-void GL_DrawRangeElements(int firstvert, int endvert, int indexcount, GLuint *index)
-{
-	unsigned int i, j, in;
-	if (gl_mesh_drawmode.integer >= 3/* && (endvert - firstvert) <= gl_maxdrawrangeelementsvertices && (indexcount) <= gl_maxdrawrangeelementsindices*/)
-	{
-		// GL 1.2 or GL 1.1 with extension
-		qglDrawRangeElements(GL_TRIANGLES, firstvert, endvert, indexcount, GL_UNSIGNED_INT, index);
-	}
-	else if (gl_mesh_drawmode.integer >= 2)
-	{
-		// GL 1.1
-		qglDrawElements(GL_TRIANGLES, indexcount, GL_UNSIGNED_INT, index);
-	}
-	else if (gl_mesh_drawmode.integer >= 1)
-	{
-		// GL 1.1
-		// feed it manually using glArrayElement
-		qglBegin(GL_TRIANGLES);
-		for (i = 0;i < indexcount;i++)
-			qglArrayElement(index[i]);
-		qglEnd();
-	}
-	else
+	if (gl_state.depthmask != (m->blendfunc2 == GL_ZERO || m->depthwrite))
 	{
-		// GL 1.1 but not using vertex arrays - 3dfx glquake minigl driver
-		// feed it manually
-		qglBegin(GL_TRIANGLES);
-		if (gl_state.texture[1]) // if the mesh uses multiple textures
-		{
-			// the minigl doesn't have this (because it does not have ARB_multitexture)
-			for (i = 0;i < indexcount;i++)
-			{
-				in = index[i];
-				qglColor4ub(buf_bcolor[in].c[0], buf_bcolor[in].c[1], buf_bcolor[in].c[2], buf_bcolor[in].c[3]);
-				for (j = 0;j < backendunits;j++)
-					if (gl_state.texture[j])
-						qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, buf_texcoord[j][in].t[0], buf_texcoord[j][in].t[1]);
-				qglVertex3f(buf_vertex[in].v[0], buf_vertex[in].v[1], buf_vertex[in].v[2]);
-			}
-		}
-		else
-		{
-			for (i = 0;i < indexcount;i++)
-			{
-				in = index[i];
-				qglColor4ub(buf_bcolor[in].c[0], buf_bcolor[in].c[1], buf_bcolor[in].c[2], buf_bcolor[in].c[3]);
-				if (gl_state.texture[0])
-					qglTexCoord2f(buf_texcoord[0][in].t[0], buf_texcoord[0][in].t[1]);
-				qglVertex3f(buf_vertex[in].v[0], buf_vertex[in].v[1], buf_vertex[in].v[2]);
-			}
-		}
-		qglEnd();
+		qglDepthMask(gl_state.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite));CHECKGLERROR
 	}
 }
 
-// renders mesh buffers, called to flush buffers when full
-void R_Mesh_Render(void)
+void R_Mesh_TextureState(const rmeshstate_t *m)
 {
-	int i;
-	float *v, tempv[4], m[12];
+	int i, combinergb, combinealpha;
+	float scale;
+	gltextureunit_t *unit;
 
-	if (!backendactive)
-		Sys_Error("R_Mesh_Render: called when backend is not active\n");
-
-	if (!r_render.integer)
-	{
-		currenttriangle = 0;
-		currentvertex = 0;
-		return;
-	}
-
-	CHECKGLERROR
-
-	// drawmode 0 always uses byte colors
-	if (!gl_mesh_floatcolors.integer || gl_mesh_drawmode.integer <= 0)
-		GL_ConvertColorsFloatToByte();
+	BACKENDACTIVECHECK
 
 	if (gl_backend_rebindtextures)
 	{
@@ -735,179 +688,147 @@ void R_Mesh_Render(void)
 		GL_SetupTextureState();
 	}
 
-	GL_MeshState();
-	m[0] = buf_mesh.matrix.m[0][0];
-	m[1] = buf_mesh.matrix.m[0][1];
-	m[2] = buf_mesh.matrix.m[0][2];
-	m[3] = buf_mesh.matrix.m[0][3];
-	m[4] = buf_mesh.matrix.m[1][0];
-	m[5] = buf_mesh.matrix.m[1][1];
-	m[6] = buf_mesh.matrix.m[1][2];
-	m[7] = buf_mesh.matrix.m[1][3];
-	m[8] = buf_mesh.matrix.m[2][0];
-	m[9] = buf_mesh.matrix.m[2][1];
-	m[10] = buf_mesh.matrix.m[2][2];
-	m[11] = buf_mesh.matrix.m[2][3];
-	for (i = 0, v = buf_vertex[buf_mesh.firstvert].v;i < buf_mesh.verts;i++, v += 4)
-	{
-		VectorCopy(v, tempv);
-		//Matrix4x4_Transform(&buf_mesh.matrix, tempv, v);
-		v[0] = tempv[0] * m[0] + tempv[1] * m[1] + tempv[2] * m[2] + m[3];
-		v[1] = tempv[0] * m[4] + tempv[1] * m[5] + tempv[2] * m[6] + m[7];
-		v[2] = tempv[0] * m[8] + tempv[1] * m[9] + tempv[2] * m[10] + m[11];
-	}
-	GL_LockArray(0, currentvertex);
-	GL_DrawRangeElements(buf_mesh.firstvert, buf_mesh.firstvert + buf_mesh.verts, buf_mesh.triangles * 3, (unsigned int *)&buf_tri[buf_mesh.firsttriangle].index[0]);CHECKGLERROR
-
-	currenttriangle = 0;
-	currentvertex = 0;
-
-	GL_UnlockArray();CHECKGLERROR
-}
-
-// restores backend state, used when done with 3D rendering
-void R_Mesh_Finish(void)
-{
-	int i;
-	if (backendunits > 1)
+	for (i = 0;i < backendunits;i++)
 	{
-		for (i = backendunits - 1;i >= 0;i--)
+		unit = gl_state.units + i;
+		if (unit->t1d != m->tex1d[i] || unit->t2d != m->tex[i] || unit->t3d != m->tex3d[i] || unit->tcubemap != m->texcubemap[i])
 		{
-			qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
-			qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
-			if (gl_combine.integer)
+			if (gl_state.unit != i)
 			{
-				qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
+				qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 			}
-			if (i > 0)
+			if (m->tex1d[i] || m->tex[i] || m->tex3d[i] || m->texcubemap[i])
 			{
-				qglDisable(GL_TEXTURE_2D);CHECKGLERROR
+				if (!unit->arrayenabled)
+				{
+					unit->arrayenabled = true;
+					if (gl_state.clientunit != i)
+					{
+						qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
+					}
+					qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
+				}
 			}
 			else
 			{
-				qglEnable(GL_TEXTURE_2D);CHECKGLERROR
+				if (unit->arrayenabled)
+				{
+					unit->arrayenabled = false;
+					if (gl_state.clientunit != i)
+					{
+						qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
+					}
+					qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
+				}
 			}
-			qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
-
-			if (usedarrays)
+			combinergb = m->texcombinergb[i];
+			combinealpha = m->texcombinealpha[i];
+			if (!combinergb)
+				combinergb = GL_MODULATE;
+			if (!combinealpha)
+				combinealpha = GL_MODULATE;
+			if (unit->combinergb != combinergb)
 			{
-				qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
-				qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
+				unit->combinergb = combinergb;
+				if (gl_combine.integer)
+				{
+					qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
+				}
+				else
+				{
+					qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
+				}
+			}
+			if (unit->combinealpha != combinealpha)
+			{
+				unit->combinealpha = combinealpha;
+				if (gl_combine.integer)
+				{
+					qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
+				}
+			}
+			if (unit->t1d != m->tex1d[i])
+			{
+				if (m->tex1d[i])
+				{
+					if (unit->t1d == 0)
+						qglEnable(GL_TEXTURE_1D);CHECKGLERROR
+				}
+				else
+				{
+					if (unit->t1d)
+						qglDisable(GL_TEXTURE_1D);CHECKGLERROR
+				}
+				qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
+			}
+			if (unit->t2d != m->tex[i])
+			{
+				if (m->tex[i])
+				{
+					if (unit->t2d == 0)
+						qglEnable(GL_TEXTURE_2D);CHECKGLERROR
+				}
+				else
+				{
+					if (unit->t2d)
+						qglDisable(GL_TEXTURE_2D);CHECKGLERROR
+				}
+				qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
+			}
+			if (unit->t3d != m->tex3d[i])
+			{
+				if (m->tex3d[i])
+				{
+					if (unit->t3d == 0)
+						qglEnable(GL_TEXTURE_3D);CHECKGLERROR
+				}
+				else
+				{
+					if (unit->t3d)
+						qglDisable(GL_TEXTURE_3D);CHECKGLERROR
+				}
+				qglBindTexture(GL_TEXTURE_3D, (unit->t3d = m->tex3d[i]));CHECKGLERROR
+			}
+			if (unit->tcubemap != m->texcubemap[i])
+			{
+				if (m->texcubemap[i])
+				{
+					if (unit->tcubemap == 0)
+						qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
+				}
+				else
+				{
+					if (unit->tcubemap)
+						qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
+				}
+				qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 			}
 		}
-	}
-	else
-	{
-		qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
-		qglEnable(GL_TEXTURE_2D);CHECKGLERROR
-		if (usedarrays)
-		{
-			qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
-		}
-	}
-	if (usedarrays)
-	{
-		qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
-		qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
-	}
-
-	qglDisable(GL_BLEND);CHECKGLERROR
-	qglEnable(GL_DEPTH_TEST);CHECKGLERROR
-	qglDepthMask(GL_TRUE);CHECKGLERROR
-	qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
-}
-
-void R_Mesh_ClearDepth(void)
-{
-	R_Mesh_Finish();
-	qglClear(GL_DEPTH_BUFFER_BIT);
-	R_Mesh_Start(r_mesh_farclip);
-}
-
-// allocates space in geometry buffers, and fills in pointers to the buffers in passsed struct
-// (this is used for very high speed rendering, no copying)
-int R_Mesh_Draw_GetBuffer(rmeshbufferinfo_t *m, int wantoverbright)
-{
-	// these are static because gcc runs out of virtual registers otherwise
-	int i, j, overbright;
-	float scaler;
-
-	if (!backendactive)
-		Sys_Error("R_Mesh_Draw_GetBuffer: called when backend is not active\n");
-
-	if (!m->numtriangles
-	 || !m->numverts)
-		Host_Error("R_Mesh_Draw_GetBuffer: no triangles or verts\n");
-
-	i = max(m->numtriangles * 3, m->numverts);
-	if (overflowedverts < i)
-		overflowedverts = i;
-
-	if (m->numtriangles > max_tris || m->numverts > max_verts)
-	{
-		Con_Printf("R_Mesh_Draw_GetBuffer: mesh too big for current gl_mesh_maxtriangles setting, increasing limits\n");
-		return false;
-	}
-
-	c_meshs++;
-	c_meshtris += m->numtriangles;
-	m->index = &buf_tri[currenttriangle].index[0];
-	m->vertex = &buf_vertex[currentvertex].v[0];
-	m->color = &buf_fcolor[currentvertex].c[0];
-	for (i = 0;i < backendunits;i++)
-		m->texcoords[i] = &buf_texcoord[i][currentvertex].t[0];
-
-	// opaque meshs are rendered directly
-	buf_mesh.firsttriangle = currenttriangle;
-	buf_mesh.firstvert = currentvertex;
-	currenttriangle += m->numtriangles;
-	currentvertex += m->numverts;
-
-	buf_mesh.blendfunc1 = m->blendfunc1;
-	buf_mesh.blendfunc2 = m->blendfunc2;
-	buf_mesh.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite);
-	buf_mesh.depthtest = !m->depthdisable;
-	buf_mesh.triangles = m->numtriangles;
-	buf_mesh.verts = m->numverts;
-	buf_mesh.matrix = m->matrix; // this copies the struct
-
-	overbright = false;
-	scaler = 1;
-	if (m->blendfunc1 == GL_DST_COLOR)
-	{
-		// check if it is a 2x modulate with framebuffer
-		if (m->blendfunc2 == GL_SRC_COLOR)
-			scaler *= 0.5f;
-	}
-	else if (m->blendfunc2 != GL_SRC_COLOR)
-	{
-		if (m->tex[0])
+		scale = max(m->texrgbscale[i], 1);
+		if (gl_state.units[i].rgbscale != scale)
 		{
-			overbright = wantoverbright && gl_combine.integer;
-			if (overbright)
-				scaler *= 0.25f;
+			if (gl_state.unit != i)
+			{
+				qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
+			}
+			qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.units[i].rgbscale = scale));CHECKGLERROR
 		}
-		scaler *= overbrightscale;
-	}
-	m->colorscale = scaler;
-
-	j = -1;
-	for (i = 0;i < MAX_TEXTUREUNITS;i++)
-	{
-		if ((buf_mesh.textures[i] = m->tex[i]))
+		scale = max(m->texalphascale[i], 1);
+		if (gl_state.units[i].alphascale != scale)
 		{
-			j = i;
-			if (i >= backendunits)
-				Sys_Error("R_Mesh_Draw_GetBuffer: texture %i supplied when there are only %i texture units\n", j + 1, backendunits);
+			if (gl_state.unit != i)
+			{
+				qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
+			}
+			qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (gl_state.units[i].alphascale = scale));CHECKGLERROR
 		}
-		buf_mesh.texturergbscale[i] = m->texrgbscale[i];
-		if (buf_mesh.texturergbscale[i] != 1 && buf_mesh.texturergbscale[i] != 2 && buf_mesh.texturergbscale[i] != 4)
-			buf_mesh.texturergbscale[i] = 1;
 	}
-	if (overbright && j >= 0)
-		buf_mesh.texturergbscale[j] = 4;
+}
 
-	return true;
+void R_Mesh_State(const rmeshstate_t *m)
+{
+	R_Mesh_MainState(m);
+	R_Mesh_TextureState(m);
 }
 
 /*
@@ -921,7 +842,7 @@ int R_Mesh_Draw_GetBuffer(rmeshbufferinfo_t *m, int wantoverbright)
 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
 {
 	qboolean ret;
-	int i;
+	int i, j;
 	qbyte *buffer;
 
 	if (!r_render.integer)
@@ -933,8 +854,13 @@ qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
 
 	// LordHavoc: compensate for v_overbrightbits when using hardware gamma
 	if (v_hwgamma.integer)
+	{
 		for (i = 0;i < width * height * 3;i++)
-			buffer[i] <<= v_overbrightbits.integer;
+		{
+			j = buffer[i] << v_overbrightbits.integer;
+			buffer[i] = (qbyte) (bound(0, j, 255));
+		}
+	}
 
 	ret = Image_WriteTGARGB_preflipped(filename, width, height, buffer);
 
@@ -950,8 +876,16 @@ void R_ClearScreen(void)
 	{
 		// clear to black
 		qglClearColor(0,0,0,0);CHECKGLERROR
+		qglClearDepth(1);CHECKGLERROR
+		if (gl_stencil)
+		{
+			// LordHavoc: we use a stencil centered around 128 instead of 0,
+			// to avoid clamping interfering with strange shadow volume
+			// drawing orders
+			qglClearStencil(128);CHECKGLERROR
+		}
 		// clear the screen
-		qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);CHECKGLERROR
+		qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));CHECKGLERROR
 		// set dithering mode
 		if (gl_dither.integer)
 		{
@@ -987,13 +921,12 @@ void SCR_UpdateScreen (void)
 		Cvar_SetValueQuick(&gl_combine, 0);
 
 	// lighting scale
-	overbrightscale = 1.0f / (float) (1 << v_overbrightbits.integer);
+	r_colorscale = 1.0f / (float) (1 << v_overbrightbits.integer);
 
 	// lightmaps only
-	lightscalebit = v_overbrightbits.integer;
+	r_lightmapscalebit = v_overbrightbits.integer;
 	if (gl_combine.integer && r_textureunits.integer > 1)
-		lightscalebit += 2;
-	lightscale = 1.0f / (float) (1 << lightscalebit);
+		r_lightmapscalebit += 2;
 
 	R_TimeReport("setup");