#include "quakedef.h"

// global video state
viddef_t vid;

// LordHavoc: these are only set in wgl
qboolean isG200 = false; // LordHavoc: the Matrox G200 can't do per pixel alpha, and it uses a D3D driver for GL... ugh...
qboolean isRagePro = false; // LordHavoc: the ATI Rage Pro has limitations with per pixel alpha (the color scaler does not apply to per pixel alpha images...), although not as bad as a G200.

// AK FIXME -> input_dest
qboolean in_client_mouse = true;

// AK where should it be placed ?
float in_mouse_x, in_mouse_y;

// GL_ARB_multitexture
int gl_textureunits = 0;
// GL_ARB_texture_env_combine or GL_EXT_texture_env_combine
int gl_combine_extension = false;
// GL_EXT_compiled_vertex_array
int gl_supportslockarrays = false;
// GLX_SGI_video_sync or WGL_EXT_swap_control
int gl_videosyncavailable = false;
// stencil available
int gl_stencil = false;
// 3D textures available
int gl_texture3d = false;
// GL_ARB_texture_cubemap
int gl_texturecubemap = false;
// GL_ARB_texture_env_dot3
int gl_dot3arb = false;
// GL_SGIS_texture_edge_clamp
int gl_support_clamptoedge = false;
// GL_NV_vertex_array_range
int gl_support_var = false;
// GL_NV_vertex_array_range2
int gl_support_var2 = false;
// GL_EXT_texture_filter_anisotropic
int gl_support_anisotropy = false;
// GL_NV_texture_shader
int gl_textureshader = false;

// LordHavoc: if window is hidden, don't update screen
int vid_hidden = true;
// LordHavoc: if window is not the active window, don't hog as much CPU time,
// let go of the mouse, turn off sound, and restore system gamma ramps...
int vid_activewindow = true;

// we don't know until we try it!
cvar_t vid_hardwaregammasupported = {CVAR_READONLY,"vid_hardwaregammasupported","1"};
// whether hardware gamma ramps are currently in effect
int vid_usinghwgamma = false;

unsigned short vid_gammaramps[768];
unsigned short vid_systemgammaramps[768];

cvar_t vid_fullscreen = {CVAR_SAVE, "vid_fullscreen", "1"};
cvar_t vid_width = {CVAR_SAVE, "vid_width", "640"};
cvar_t vid_height = {CVAR_SAVE, "vid_height", "480"};
cvar_t vid_bitsperpixel = {CVAR_SAVE, "vid_bitsperpixel", "32"};

cvar_t vid_mouse = {CVAR_SAVE, "vid_mouse", "1"};
cvar_t gl_combine = {CVAR_SAVE, "gl_combine", "1"};

cvar_t in_pitch_min = {0, "in_pitch_min", "-70"};
cvar_t in_pitch_max = {0, "in_pitch_max", "80"};

cvar_t m_filter = {CVAR_SAVE, "m_filter","0"};

cvar_t v_gamma = {CVAR_SAVE, "v_gamma", "1"};
cvar_t v_contrast = {CVAR_SAVE, "v_contrast", "1"};
cvar_t v_brightness = {CVAR_SAVE, "v_brightness", "0"};
cvar_t v_color_enable = {CVAR_SAVE, "v_color_enable", "0"};
cvar_t v_color_black_r = {CVAR_SAVE, "v_color_black_r", "0"};
cvar_t v_color_black_g = {CVAR_SAVE, "v_color_black_g", "0"};
cvar_t v_color_black_b = {CVAR_SAVE, "v_color_black_b", "0"};
cvar_t v_color_grey_r = {CVAR_SAVE, "v_color_grey_r", "0.5"};
cvar_t v_color_grey_g = {CVAR_SAVE, "v_color_grey_g", "0.5"};
cvar_t v_color_grey_b = {CVAR_SAVE, "v_color_grey_b", "0.5"};
cvar_t v_color_white_r = {CVAR_SAVE, "v_color_white_r", "1"};
cvar_t v_color_white_g = {CVAR_SAVE, "v_color_white_g", "1"};
cvar_t v_color_white_b = {CVAR_SAVE, "v_color_white_b", "1"};
cvar_t v_hwgamma = {CVAR_SAVE, "v_hwgamma", "1"};
cvar_t v_psycho = {0, "v_psycho", "0"};

// brand of graphics chip
const char *gl_vendor;
// graphics chip model and other information
const char *gl_renderer;
// begins with 1.0.0, 1.1.0, 1.2.0, 1.2.1, 1.3.0, 1.3.1, or 1.4.0
const char *gl_version;
// extensions list, space separated
const char *gl_extensions;
// WGL, GLX, or AGL
const char *gl_platform;
// another extensions list, containing platform-specific extensions that are
// not in the main list
const char *gl_platformextensions;
// name of driver library (opengl32.dll, libGL.so.1, or whatever)
char gl_driver[256];

// GL_ARB_multitexture
void (GLAPIENTRY *qglMultiTexCoord2f) (GLenum, GLfloat, GLfloat);
void (GLAPIENTRY *qglMultiTexCoord3f) (GLenum, GLfloat, GLfloat, GLfloat);
void (GLAPIENTRY *qglActiveTexture) (GLenum);
void (GLAPIENTRY *qglClientActiveTexture) (GLenum);

// GL_EXT_compiled_vertex_array
void (GLAPIENTRY *qglLockArraysEXT) (GLint first, GLint count);
void (GLAPIENTRY *qglUnlockArraysEXT) (void);

//GL_NV_vertex_array_range
GLvoid *(GLAPIENTRY *qglAllocateMemoryNV)(GLsizei size, GLfloat readFrequency, GLfloat writeFrequency, GLfloat priority);
GLvoid (GLAPIENTRY *qglFreeMemoryNV)(GLvoid *pointer);
GLvoid (GLAPIENTRY *qglVertexArrayRangeNV)(GLsizei length, GLvoid *pointer);
GLvoid (GLAPIENTRY *qglFlushVertexArrayRangeNV)(GLvoid);

// general GL functions

void (GLAPIENTRY *qglClearColor)(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);

void (GLAPIENTRY *qglClear)(GLbitfield mask);

//void (GLAPIENTRY *qglAlphaFunc)(GLenum func, GLclampf ref);
void (GLAPIENTRY *qglBlendFunc)(GLenum sfactor, GLenum dfactor);
void (GLAPIENTRY *qglCullFace)(GLenum mode);

//void (GLAPIENTRY *qglDrawBuffer)(GLenum mode);
//void (GLAPIENTRY *qglReadBuffer)(GLenum mode);
void (GLAPIENTRY *qglEnable)(GLenum cap);
void (GLAPIENTRY *qglDisable)(GLenum cap);
GLboolean (GLAPIENTRY *qglIsEnabled)(GLenum cap);

void (GLAPIENTRY *qglEnableClientState)(GLenum cap);
void (GLAPIENTRY *qglDisableClientState)(GLenum cap);

//void (GLAPIENTRY *qglGetBooleanv)(GLenum pname, GLboolean *params);
//void (GLAPIENTRY *qglGetDoublev)(GLenum pname, GLdouble *params);
//void (GLAPIENTRY *qglGetFloatv)(GLenum pname, GLfloat *params);
void (GLAPIENTRY *qglGetIntegerv)(GLenum pname, GLint *params);

GLenum (GLAPIENTRY *qglGetError)(void);
const GLubyte* (GLAPIENTRY *qglGetString)(GLenum name);
void (GLAPIENTRY *qglFinish)(void);
void (GLAPIENTRY *qglFlush)(void);

void (GLAPIENTRY *qglClearDepth)(GLclampd depth);
void (GLAPIENTRY *qglDepthFunc)(GLenum func);
void (GLAPIENTRY *qglDepthMask)(GLboolean flag);
void (GLAPIENTRY *qglDepthRange)(GLclampd near_val, GLclampd far_val);
void (GLAPIENTRY *qglColorMask)(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha);

void (GLAPIENTRY *qglDrawRangeElements)(GLenum mode, GLuint start, GLuint end, GLsizei count, GLenum type, const GLvoid *indices);
void (GLAPIENTRY *qglDrawElements)(GLenum mode, GLsizei count, GLenum type, const GLvoid *indices);
void (GLAPIENTRY *qglVertexPointer)(GLint size, GLenum type, GLsizei stride, const GLvoid *ptr);
void (GLAPIENTRY *qglNormalPointer)(GLenum type, GLsizei stride, const GLvoid *ptr);
void (GLAPIENTRY *qglColorPointer)(GLint size, GLenum type, GLsizei stride, const GLvoid *ptr);
void (GLAPIENTRY *qglTexCoordPointer)(GLint size, GLenum type, GLsizei stride, const GLvoid *ptr);
void (GLAPIENTRY *qglArrayElement)(GLint i);

void (GLAPIENTRY *qglColor4f)(GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha);
void (GLAPIENTRY *qglTexCoord2f)(GLfloat s, GLfloat t);
void (GLAPIENTRY *qglTexCoord2f)(GLfloat s, GLfloat t);
void (GLAPIENTRY *qglTexCoord3f)(GLfloat s, GLfloat t, GLfloat r);
void (GLAPIENTRY *qglVertex2f)(GLfloat x, GLfloat y);
void (GLAPIENTRY *qglVertex3f)(GLfloat x, GLfloat y, GLfloat z);
void (GLAPIENTRY *qglBegin)(GLenum mode);
void (GLAPIENTRY *qglEnd)(void);

void (GLAPIENTRY *qglMatrixMode)(GLenum mode);
void (GLAPIENTRY *qglOrtho)(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near_val, GLdouble far_val);
void (GLAPIENTRY *qglFrustum)(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near_val, GLdouble far_val);
void (GLAPIENTRY *qglViewport)(GLint x, GLint y, GLsizei width, GLsizei height);
//void (GLAPIENTRY *qglPushMatrix)(void);
//void (GLAPIENTRY *qglPopMatrix)(void);
void (GLAPIENTRY *qglLoadIdentity)(void);
//void (GLAPIENTRY *qglLoadMatrixd)(const GLdouble *m);
void (GLAPIENTRY *qglLoadMatrixf)(const GLfloat *m);
//void (GLAPIENTRY *qglMultMatrixd)(const GLdouble *m);
//void (GLAPIENTRY *qglMultMatrixf)(const GLfloat *m);
//void (GLAPIENTRY *qglRotated)(GLdouble angle, GLdouble x, GLdouble y, GLdouble z);
//void (GLAPIENTRY *qglRotatef)(GLfloat angle, GLfloat x, GLfloat y, GLfloat z);
//void (GLAPIENTRY *qglScaled)(GLdouble x, GLdouble y, GLdouble z);
//void (GLAPIENTRY *qglScalef)(GLfloat x, GLfloat y, GLfloat z);
//void (GLAPIENTRY *qglTranslated)(GLdouble x, GLdouble y, GLdouble z);
//void (GLAPIENTRY *qglTranslatef)(GLfloat x, GLfloat y, GLfloat z);

void (GLAPIENTRY *qglReadPixels)(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid *pixels);

void (GLAPIENTRY *qglStencilFunc)(GLenum func, GLint ref, GLuint mask);
void (GLAPIENTRY *qglStencilMask)(GLuint mask);
void (GLAPIENTRY *qglStencilOp)(GLenum fail, GLenum zfail, GLenum zpass);
void (GLAPIENTRY *qglClearStencil)(GLint s);

//void (GLAPIENTRY *qglTexEnvf)(GLenum target, GLenum pname, GLfloat param);
void (GLAPIENTRY *qglTexEnvfv)(GLenum target, GLenum pname, const GLfloat *params);
void (GLAPIENTRY *qglTexEnvi)(GLenum target, GLenum pname, GLint param);
void (GLAPIENTRY *qglTexParameterf)(GLenum target, GLenum pname, GLfloat param);
//void (GLAPIENTRY *qglTexParameterfv)(GLenum target, GLenum pname, GLfloat *params);
void (GLAPIENTRY *qglTexParameteri)(GLenum target, GLenum pname, GLint param);

void (GLAPIENTRY *qglGenTextures)(GLsizei n, GLuint *textures);
void (GLAPIENTRY *qglDeleteTextures)(GLsizei n, const GLuint *textures);
void (GLAPIENTRY *qglBindTexture)(GLenum target, GLuint texture);
//void (GLAPIENTRY *qglPrioritizeTextures)(GLsizei n, const GLuint *textures, const GLclampf *priorities);
//GLboolean (GLAPIENTRY *qglAreTexturesResident)(GLsizei n, const GLuint *textures, GLboolean *residences);
GLboolean (GLAPIENTRY *qglIsTexture)(GLuint texture);
//void (GLAPIENTRY *qglPixelStoref)(GLenum pname, GLfloat param);
void (GLAPIENTRY *qglPixelStorei)(GLenum pname, GLint param);

void (GLAPIENTRY *qglTexImage1D)(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLint border, GLenum format, GLenum type, const GLvoid *pixels);
void (GLAPIENTRY *qglTexImage2D)(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid *pixels);
void (GLAPIENTRY *qglTexSubImage1D)(GLenum target, GLint level, GLint xoffset, GLsizei width, GLenum format, GLenum type, const GLvoid *pixels);
void (GLAPIENTRY *qglTexSubImage2D)(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid *pixels);
void (GLAPIENTRY *qglCopyTexImage1D)(GLenum target, GLint level, GLenum internalformat, GLint x, GLint y, GLsizei width, GLint border);
void (GLAPIENTRY *qglCopyTexImage2D)(GLenum target, GLint level, GLenum internalformat, GLint x, GLint y, GLsizei width, GLsizei height, GLint border);
void (GLAPIENTRY *qglCopyTexSubImage1D)(GLenum target, GLint level, GLint xoffset, GLint x, GLint y, GLsizei width);
void (GLAPIENTRY *qglCopyTexSubImage2D)(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width, GLsizei height);


void (GLAPIENTRY *qglDrawRangeElementsEXT)(GLenum mode, GLuint start, GLuint end, GLsizei count, GLenum type, const GLvoid *indices);

//void (GLAPIENTRY *qglColorTableEXT)(int, int, int, int, int, const void *);

void (GLAPIENTRY *qglTexImage3D)(GLenum target, GLint level, GLenum internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, const GLvoid *pixels);
void (GLAPIENTRY *qglTexSubImage3D)(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, const GLvoid *pixels);
void (GLAPIENTRY *qglCopyTexSubImage3D)(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLint x, GLint y, GLsizei width, GLsizei height);

void (GLAPIENTRY *qglScissor)(GLint x, GLint y, GLsizei width, GLsizei height);

void (GLAPIENTRY *qglPolygonOffset)(GLfloat factor, GLfloat units);

int GL_CheckExtension(const char *name, const dllfunction_t *funcs, const char *disableparm, int silent)
{
	int failed = false;
	const dllfunction_t *func;

	Con_DPrintf("checking for %s...  ", name);

	for (func = funcs;func && func->name;func++)
		*func->funcvariable = NULL;

	if (disableparm && (COM_CheckParm(disableparm) || COM_CheckParm("-safe")))
	{
		Con_DPrintf("disabled by commandline\n");
		return false;
	}

	if (strstr(gl_extensions, name) || strstr(gl_platformextensions, name) || (strncmp(name, "GL_", 3) && strncmp(name, "WGL_", 4) && strncmp(name, "GLX_", 4) && strncmp(name, "AGL_", 4)))
	{
		for (func = funcs;func && func->name != NULL;func++)
		{
			// functions are cleared before all the extensions are evaluated
			if (!(*func->funcvariable = (void *) GL_GetProcAddress(func->name)))
			{
				if (!silent)
					Con_Printf("OpenGL extension \"%s\" is missing function \"%s\" - broken driver!\n", name, func->name);
				failed = true;
			}
		}
		// delay the return so it prints all missing functions
		if (failed)
			return false;
		Con_DPrintf("enabled\n");
		return true;
	}
	else
	{
		Con_DPrintf("not detected\n");
		return false;
	}
}

static dllfunction_t opengl110funcs[] =
{
	{"glClearColor", (void **) &qglClearColor},
	{"glClear", (void **) &qglClear},
//	{"glAlphaFunc", (void **) &qglAlphaFunc},
	{"glBlendFunc", (void **) &qglBlendFunc},
	{"glCullFace", (void **) &qglCullFace},
//	{"glDrawBuffer", (void **) &qglDrawBuffer},
//	{"glReadBuffer", (void **) &qglReadBuffer},
	{"glEnable", (void **) &qglEnable},
	{"glDisable", (void **) &qglDisable},
	{"glIsEnabled", (void **) &qglIsEnabled},
	{"glEnableClientState", (void **) &qglEnableClientState},
	{"glDisableClientState", (void **) &qglDisableClientState},
//	{"glGetBooleanv", (void **) &qglGetBooleanv},
//	{"glGetDoublev", (void **) &qglGetDoublev},
//	{"glGetFloatv", (void **) &qglGetFloatv},
	{"glGetIntegerv", (void **) &qglGetIntegerv},
	{"glGetError", (void **) &qglGetError},
	{"glGetString", (void **) &qglGetString},
	{"glFinish", (void **) &qglFinish},
	{"glFlush", (void **) &qglFlush},
	{"glClearDepth", (void **) &qglClearDepth},
	{"glDepthFunc", (void **) &qglDepthFunc},
	{"glDepthMask", (void **) &qglDepthMask},
	{"glDepthRange", (void **) &qglDepthRange},
	{"glDrawElements", (void **) &qglDrawElements},
	{"glColorMask", (void **) &qglColorMask},
	{"glVertexPointer", (void **) &qglVertexPointer},
	{"glNormalPointer", (void **) &qglNormalPointer},
	{"glColorPointer", (void **) &qglColorPointer},
	{"glTexCoordPointer", (void **) &qglTexCoordPointer},
	{"glArrayElement", (void **) &qglArrayElement},
	{"glColor4f", (void **) &qglColor4f},
	{"glTexCoord2f", (void **) &qglTexCoord2f},
	{"glTexCoord3f", (void **) &qglTexCoord3f},
	{"glVertex2f", (void **) &qglVertex2f},
	{"glVertex3f", (void **) &qglVertex3f},
	{"glBegin", (void **) &qglBegin},
	{"glEnd", (void **) &qglEnd},
	{"glMatrixMode", (void **) &qglMatrixMode},
	{"glOrtho", (void **) &qglOrtho},
	{"glFrustum", (void **) &qglFrustum},
	{"glViewport", (void **) &qglViewport},
//	{"glPushMatrix", (void **) &qglPushMatrix},
//	{"glPopMatrix", (void **) &qglPopMatrix},
	{"glLoadIdentity", (void **) &qglLoadIdentity},
//	{"glLoadMatrixd", (void **) &qglLoadMatrixd},
	{"glLoadMatrixf", (void **) &qglLoadMatrixf},
//	{"glMultMatrixd", (void **) &qglMultMatrixd},
//	{"glMultMatrixf", (void **) &qglMultMatrixf},
//	{"glRotated", (void **) &qglRotated},
//	{"glRotatef", (void **) &qglRotatef},
//	{"glScaled", (void **) &qglScaled},
//	{"glScalef", (void **) &qglScalef},
//	{"glTranslated", (void **) &qglTranslated},
//	{"glTranslatef", (void **) &qglTranslatef},
	{"glReadPixels", (void **) &qglReadPixels},
	{"glStencilFunc", (void **) &qglStencilFunc},
	{"glStencilMask", (void **) &qglStencilMask},
	{"glStencilOp", (void **) &qglStencilOp},
	{"glClearStencil", (void **) &qglClearStencil},
//	{"glTexEnvf", (void **) &qglTexEnvf},
	{"glTexEnvfv", (void **) &qglTexEnvfv},
	{"glTexEnvi", (void **) &qglTexEnvi},
	{"glTexParameterf", (void **) &qglTexParameterf},
//	{"glTexParameterfv", (void **) &qglTexParameterfv},
	{"glTexParameteri", (void **) &qglTexParameteri},
//	{"glPixelStoref", (void **) &qglPixelStoref},
	{"glPixelStorei", (void **) &qglPixelStorei},
	{"glGenTextures", (void **) &qglGenTextures},
	{"glDeleteTextures", (void **) &qglDeleteTextures},
	{"glBindTexture", (void **) &qglBindTexture},
//	{"glPrioritizeTextures", (void **) &qglPrioritizeTextures},
//	{"glAreTexturesResident", (void **) &qglAreTexturesResident},
	{"glIsTexture", (void **) &qglIsTexture},
	{"glTexImage1D", (void **) &qglTexImage1D},
	{"glTexImage2D", (void **) &qglTexImage2D},
	{"glTexSubImage1D", (void **) &qglTexSubImage1D},
	{"glTexSubImage2D", (void **) &qglTexSubImage2D},
	{"glCopyTexImage1D", (void **) &qglCopyTexImage1D},
	{"glCopyTexImage2D", (void **) &qglCopyTexImage2D},
	{"glCopyTexSubImage1D", (void **) &qglCopyTexSubImage1D},
	{"glCopyTexSubImage2D", (void **) &qglCopyTexSubImage2D},
	{"glScissor", (void **) &qglScissor},
	{"glPolygonOffset", (void **) &qglPolygonOffset},
	{NULL, NULL}
};

static dllfunction_t drawrangeelementsfuncs[] =
{
	{"glDrawRangeElements", (void **) &qglDrawRangeElements},
	{NULL, NULL}
};

static dllfunction_t drawrangeelementsextfuncs[] =
{
	{"glDrawRangeElementsEXT", (void **) &qglDrawRangeElementsEXT},
	{NULL, NULL}
};

static dllfunction_t multitexturefuncs[] =
{
	{"glMultiTexCoord2fARB", (void **) &qglMultiTexCoord2f},
	{"glMultiTexCoord3fARB", (void **) &qglMultiTexCoord3f},
	{"glActiveTextureARB", (void **) &qglActiveTexture},
	{"glClientActiveTextureARB", (void **) &qglClientActiveTexture},
	{NULL, NULL}
};

static dllfunction_t compiledvertexarrayfuncs[] =
{
	{"glLockArraysEXT", (void **) &qglLockArraysEXT},
	{"glUnlockArraysEXT", (void **) &qglUnlockArraysEXT},
	{NULL, NULL}
};

static dllfunction_t texture3dextfuncs[] =
{
	{"glTexImage3DEXT", (void **) &qglTexImage3D},
	{"glTexSubImage3DEXT", (void **) &qglTexSubImage3D},
	{"glCopyTexSubImage3DEXT", (void **) &qglCopyTexSubImage3D},
	{NULL, NULL}
};

static dllfunction_t glxvarfuncs[] =
{
	{"glXAllocateMemoryNV", (void **) &qglAllocateMemoryNV},
	{"glXFreeMemoryNV", (void **) &qglFreeMemoryNV},
	{"glVertexArrayRangeNV", (void **) &qglVertexArrayRangeNV},
	{"glFlushVertexArrayRangeNV", (void **) &qglFlushVertexArrayRangeNV},
	{NULL, NULL}
};

static dllfunction_t wglvarfuncs[] =
{
	{"wglAllocateMemoryNV", (void **) &qglAllocateMemoryNV},
	{"wglFreeMemoryNV", (void **) &qglFreeMemoryNV},
	{"glVertexArrayRangeNV", (void **) &qglVertexArrayRangeNV},
	{"glFlushVertexArrayRangeNV", (void **) &qglFlushVertexArrayRangeNV},
	{NULL, NULL}
};


void VID_CheckExtensions(void)
{
	gl_stencil = vid_bitsperpixel.integer == 32;
	gl_combine_extension = false;
	gl_dot3arb = false;
	gl_supportslockarrays = false;
	gl_textureunits = 1;
	gl_support_clamptoedge = false;
	gl_support_var = false;
	gl_support_var2 = false;

	if (!GL_CheckExtension("OpenGL 1.1.0", opengl110funcs, NULL, false))
		Sys_Error("OpenGL 1.1.0 functions not found\n");

	Con_DPrintf ("GL_VENDOR: %s\n", gl_vendor);
	Con_DPrintf ("GL_RENDERER: %s\n", gl_renderer);
	Con_DPrintf ("GL_VERSION: %s\n", gl_version);
	Con_DPrintf ("GL_EXTENSIONS: %s\n", gl_extensions);
	Con_DPrintf ("%s_EXTENSIONS: %s\n", gl_platform, gl_platformextensions);

	Con_DPrintf("Checking OpenGL extensions...\n");

	if (!GL_CheckExtension("glDrawRangeElements", drawrangeelementsfuncs, "-nodrawrangeelements", true))
		GL_CheckExtension("GL_EXT_draw_range_elements", drawrangeelementsextfuncs, "-nodrawrangeelements", false);

	if (GL_CheckExtension("GL_ARB_multitexture", multitexturefuncs, "-nomtex", false))
	{
		qglGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &gl_textureunits);
		gl_combine_extension = GL_CheckExtension("GL_ARB_texture_env_combine", NULL, "-nocombine", false) || GL_CheckExtension("GL_EXT_texture_env_combine", NULL, "-nocombine", false);
		if (gl_combine_extension)
			gl_dot3arb = GL_CheckExtension("GL_ARB_texture_env_dot3", NULL, "-nodot3", false);
	}

	gl_texture3d = GL_CheckExtension("GL_EXT_texture3D", texture3dextfuncs, "-notexture3d", false);
	gl_texturecubemap = GL_CheckExtension("GL_ARB_texture_cube_map", NULL, "-nocubemap", false);
	gl_supportslockarrays = GL_CheckExtension("GL_EXT_compiled_vertex_array", compiledvertexarrayfuncs, "-nocva", false);
	gl_support_clamptoedge = GL_CheckExtension("GL_EXT_texture_edge_clamp", NULL, "-noedgeclamp", false) || GL_CheckExtension("GL_SGIS_texture_edge_clamp", NULL, "-noedgeclamp", false);

	if (!strcmp(gl_platform, "GLX"))
		gl_support_var = GL_CheckExtension("GL_NV_vertex_array_range", glxvarfuncs, "-novar", false);
	else if (!strcmp(gl_platform, "WGL"))
		gl_support_var = GL_CheckExtension("GL_NV_vertex_array_range", wglvarfuncs, "-novar", false);
	if (gl_support_var)
		gl_support_var2 = GL_CheckExtension("GL_NV_vertex_array_range2", NULL, "-novar2", false);

	gl_support_anisotropy = GL_CheckExtension("GL_EXT_texture_filter_anisotropic", NULL, "-noanisotropy", false);

	gl_textureshader = GL_CheckExtension("GL_NV_texture_shader", NULL, "-notextureshader", false);

	// we don't care if it's an extension or not, they are identical functions, so keep it simple in the rendering code
	if (qglDrawRangeElements == NULL)
		qglDrawRangeElements = qglDrawRangeElementsEXT;
}

int vid_vertexarrays_are_var = false;
void *VID_AllocVertexArrays(mempool_t *pool, int size, int fast, float readfrequency, float writefrequency, float priority)
{
	void *m;
	vid_vertexarrays_are_var = false;
	if (fast && qglAllocateMemoryNV)
	{
		CHECKGLERROR
		m = qglAllocateMemoryNV(size, readfrequency, writefrequency, priority);
		CHECKGLERROR
		if (m)
		{
			vid_vertexarrays_are_var = true;
			return m;
		}
	}
	return Mem_Alloc(pool, size);
}

void VID_FreeVertexArrays(void *pointer)
{
	if (vid_vertexarrays_are_var)
	{
		CHECKGLERROR
		qglFreeMemoryNV(pointer);
		CHECKGLERROR
	}
	else
		Mem_Free(pointer);
	vid_vertexarrays_are_var = false;
}

void Force_CenterView_f (void)
{
	cl.viewangles[PITCH] = 0;
}

void IN_PreMove(void)
{
}

void CL_AdjustAngles(void);
void IN_PostMove(void)
{
	// clamp after the move as well to prevent messed up rendering angles
	CL_AdjustAngles();
}

/*
===========
IN_DoMove
===========
*/
void IN_ProcessMove(usercmd_t *cmd)
{
	// get basic movement from keyboard
	CL_BaseMove(cmd);

	// OS independent code
	IN_PreMove();

	// allow mice or other external controllers to add to the move
	IN_Move(cmd);

	// OS independent code
	IN_PostMove();
}


void IN_Mouse(usercmd_t *cmd, float mx, float my)
{
	int mouselook = (in_mlook.state & 1) || freelook.integer;
	float mouse_x, mouse_y;
	static float old_mouse_x = 0, old_mouse_y = 0;

	if (m_filter.integer)
	{
		mouse_x = (mx + old_mouse_x) * 0.5;
		mouse_y = (my + old_mouse_y) * 0.5;
	}
	else
	{
		mouse_x = mx;
		mouse_y = my;
	}

	old_mouse_x = mx;
	old_mouse_y = my;

	in_mouse_x = (float) mouse_x * vid.conwidth / vid.realwidth;
	in_mouse_y = (float) mouse_y * vid.conheight / vid.realheight;

	// AK: eveything else is client stuff
	// BTW, this should be seperated somewhen
	if(!in_client_mouse)
		return;

	// LordHavoc: viewzoom affects mouse sensitivity for sniping
	mouse_x *= sensitivity.value * cl.viewzoom;
	mouse_y *= sensitivity.value * cl.viewzoom;

	// Add mouse X/Y movement to cmd
	if ((in_strafe.state & 1) || (lookstrafe.integer && mouselook))
		cmd->sidemove += m_side.value * mouse_x;
	else
		cl.viewangles[YAW] -= m_yaw.value * mouse_x;

	if (mouselook)
		V_StopPitchDrift();

	if (mouselook && !(in_strafe.state & 1))
		cl.viewangles[PITCH] += m_pitch.value * mouse_y;
	else
	{
		if ((in_strafe.state & 1) && noclip_anglehack)
			cmd->upmove -= m_forward.value * mouse_y;
		else
			cmd->forwardmove -= m_forward.value * mouse_y;
	}
}

static float cachegamma, cachebrightness, cachecontrast, cacheblack[3], cachegrey[3], cachewhite[3];
static int cachecolorenable, cachehwgamma;
#define BOUNDCVAR(cvar, m1, m2) c = &(cvar);f = bound(m1, c->value, m2);if (c->value != f) Cvar_SetValueQuick(c, f);
void VID_UpdateGamma(qboolean force)
{
	cvar_t *c;
	float f;
	static int forcenextframe = false;

	// LordHavoc: don't mess with gamma tables if running dedicated
	if (cls.state == ca_dedicated)
		return;

	if (!force
	 && !forcenextframe
	 && !v_psycho.integer
	 && vid_usinghwgamma == (vid_activewindow && v_hwgamma.integer)
	 && v_gamma.value == cachegamma
	 && v_contrast.value == cachecontrast
	 && v_brightness.value == cachebrightness
	 && cachecolorenable == v_color_enable.integer
	 && cacheblack[0] == v_color_black_r.value
	 && cacheblack[1] == v_color_black_g.value
	 && cacheblack[2] == v_color_black_b.value
	 && cachegrey[0] == v_color_grey_r.value
	 && cachegrey[1] == v_color_grey_g.value
	 && cachegrey[2] == v_color_grey_b.value
	 && cachewhite[0] == v_color_white_r.value
	 && cachewhite[1] == v_color_white_g.value
	 && cachewhite[2] == v_color_white_b.value)
		return;
		
	forcenextframe = false;

	if (vid_activewindow && v_hwgamma.integer)
	{
		if (!vid_usinghwgamma)
		{
			vid_usinghwgamma = true;
			Cvar_SetValueQuick(&vid_hardwaregammasupported, VID_GetGamma(vid_systemgammaramps));
		}

		BOUNDCVAR(v_gamma, 0.1, 5);cachegamma = v_gamma.value;
		BOUNDCVAR(v_contrast, 1, 5);cachecontrast = v_contrast.value;
		BOUNDCVAR(v_brightness, 0, 0.8);cachebrightness = v_brightness.value;
		BOUNDCVAR(v_color_black_r, 0, 0.8);cacheblack[0] = v_color_black_r.value;
		BOUNDCVAR(v_color_black_g, 0, 0.8);cacheblack[1] = v_color_black_g.value;
		BOUNDCVAR(v_color_black_b, 0, 0.8);cacheblack[2] = v_color_black_b.value;
		BOUNDCVAR(v_color_grey_r, 0, 0.95);cachegrey[0] = v_color_grey_r.value;
		BOUNDCVAR(v_color_grey_g, 0, 0.95);cachegrey[1] = v_color_grey_g.value;
		BOUNDCVAR(v_color_grey_b, 0, 0.95);cachegrey[2] = v_color_grey_b.value;
		BOUNDCVAR(v_color_white_r, 1, 5);cachewhite[0] = v_color_white_r.value;
		BOUNDCVAR(v_color_white_g, 1, 5);cachewhite[1] = v_color_white_g.value;
		BOUNDCVAR(v_color_white_b, 1, 5);cachewhite[2] = v_color_white_b.value;
		cachecolorenable = v_color_enable.integer;
		cachehwgamma = v_hwgamma.integer;

		if (cachecolorenable)
		{
			BuildGammaTable16(1.0f, invpow(0.5, 1 - cachegrey[0]), cachewhite[0], cacheblack[0], vid_gammaramps);
			BuildGammaTable16(1.0f, invpow(0.5, 1 - cachegrey[1]), cachewhite[1], cacheblack[1], vid_gammaramps + 256);
			BuildGammaTable16(1.0f, invpow(0.5, 1 - cachegrey[2]), cachewhite[2], cacheblack[2], vid_gammaramps + 512);
		}
		else
		{
			BuildGammaTable16(1.0f, cachegamma, cachecontrast, cachebrightness, vid_gammaramps);
			BuildGammaTable16(1.0f, cachegamma, cachecontrast, cachebrightness, vid_gammaramps + 256);
			BuildGammaTable16(1.0f, cachegamma, cachecontrast, cachebrightness, vid_gammaramps + 512);
		}

		// LordHavoc: this code came from Ben Winslow and Zinx Verituse, I have
		// immensely butchered it to work with variable framerates and fit in with
		// the rest of darkplaces.
		if (v_psycho.integer)
		{
			int x, y;
			float t;
			static float n[3], nd[3], nt[3];
			static int init = true;
			unsigned short *ramp;
			forcenextframe = true;
			if (init)
			{
				init = false;
				for (x = 0;x < 3;x++)
				{
					n[x] = lhrandom(0, 1);
					nd[x] = (rand()&1)?-0.25:0.25;
					nt[x] = lhrandom(1, 8.2);
				}
			}
			
			for (x = 0;x < 3;x++)
			{
				nt[x] -= host_realframetime;
				if (nt[x] < 0)
				{
					nd[x] = -nd[x];
					nt[x] += lhrandom(1, 8.2);
				}
				n[x] += nd[x] * host_realframetime;
				n[x] -= floor(n[x]);
			}
		
			for (x = 0, ramp = vid_gammaramps;x < 3;x++)
				for (y = 0, t = n[x] - 0.75f;y < 256;y++, t += 0.75f * (2.0f / 256.0f))
					*ramp++ = cos(t*(M_PI*2.0)) * 32767.0f + 32767.0f;
		}

		Cvar_SetValueQuick(&vid_hardwaregammasupported, VID_SetGamma(vid_gammaramps));
	}
	else
	{
		if (vid_usinghwgamma)
		{
			vid_usinghwgamma = false;
			Cvar_SetValueQuick(&vid_hardwaregammasupported, VID_SetGamma(vid_systemgammaramps));
		}
	}
}

void VID_RestoreSystemGamma(void)
{
	if (vid_usinghwgamma)
	{
		vid_usinghwgamma = false;
		VID_SetGamma(vid_systemgammaramps);
	}
}

void VID_Shared_Init(void)
{
	Cvar_RegisterVariable(&vid_hardwaregammasupported);
	Cvar_RegisterVariable(&v_gamma);
	Cvar_RegisterVariable(&v_brightness);
	Cvar_RegisterVariable(&v_contrast);

	Cvar_RegisterVariable(&v_color_enable);
	Cvar_RegisterVariable(&v_color_black_r);
	Cvar_RegisterVariable(&v_color_black_g);
	Cvar_RegisterVariable(&v_color_black_b);
	Cvar_RegisterVariable(&v_color_grey_r);
	Cvar_RegisterVariable(&v_color_grey_g);
	Cvar_RegisterVariable(&v_color_grey_b);
	Cvar_RegisterVariable(&v_color_white_r);
	Cvar_RegisterVariable(&v_color_white_g);
	Cvar_RegisterVariable(&v_color_white_b);

	Cvar_RegisterVariable(&v_hwgamma);
	
	Cvar_RegisterVariable(&v_psycho);

	Cvar_RegisterVariable(&vid_fullscreen);
	Cvar_RegisterVariable(&vid_width);
	Cvar_RegisterVariable(&vid_height);
	Cvar_RegisterVariable(&vid_bitsperpixel);
	Cvar_RegisterVariable(&vid_mouse);
	Cvar_RegisterVariable(&gl_combine);
	Cvar_RegisterVariable(&in_pitch_min);
	Cvar_RegisterVariable(&in_pitch_max);
	Cvar_RegisterVariable(&m_filter);
	Cmd_AddCommand("force_centerview", Force_CenterView_f);
	Cmd_AddCommand("vid_restart", VID_Restart_f);
	if (gamemode == GAME_GOODVSBAD2)
		Cvar_Set("gl_combine", "0");
}

int current_vid_fullscreen;
int current_vid_width;
int current_vid_height;
int current_vid_bitsperpixel;
int VID_Mode(int fullscreen, int width, int height, int bpp)
{
	Con_Printf("Video: %s %dx%dx%d\n", fullscreen ? "fullscreen" : "window", width, height, bpp);
	if (VID_InitMode(fullscreen, width, height, bpp))
	{
		current_vid_fullscreen = fullscreen;
		current_vid_width = width;
		current_vid_height = height;
		current_vid_bitsperpixel = bpp;
		Cvar_SetValueQuick(&vid_fullscreen, fullscreen);
		Cvar_SetValueQuick(&vid_width, width);
		Cvar_SetValueQuick(&vid_height, height);
		Cvar_SetValueQuick(&vid_bitsperpixel, bpp);
		return true;
	}
	else
		return false;
}

static void VID_OpenSystems(void)
{
	R_Modules_Start();
	S_Startup();
	CDAudio_Startup();
}

static void VID_CloseSystems(void)
{
	CDAudio_Shutdown();
	S_Shutdown();
	R_Modules_Shutdown();
}

int vid_commandlinecheck = true;

void VID_Restart_f(void)
{
	// don't crash if video hasn't started yet
	if (vid_commandlinecheck)
		return;

	Con_Printf("VID_Restart: changing from %s %dx%dx%dbpp, to %s %dx%dx%dbpp.\n",
		current_vid_fullscreen ? "fullscreen" : "window", current_vid_width, current_vid_height, current_vid_bitsperpixel,
		vid_fullscreen.integer ? "fullscreen" : "window", vid_width.integer, vid_height.integer, vid_bitsperpixel.integer);
	VID_Close();
	if (!VID_Mode(vid_fullscreen.integer, vid_width.integer, vid_height.integer, vid_bitsperpixel.integer))
	{
		Con_Printf("Video mode change failed\n");
		if (!VID_Mode(current_vid_fullscreen, current_vid_width, current_vid_height, current_vid_bitsperpixel))
			Sys_Error("Unable to restore to last working video mode\n");
	}
	VID_OpenSystems();
}

void VID_Open(void)
{
	int i, width, height, success;
	if (vid_commandlinecheck)
	{
		// interpret command-line parameters
		vid_commandlinecheck = false;
		if (COM_CheckParm("-window") || COM_CheckParm("-safe"))
			Cvar_SetValueQuick(&vid_fullscreen, false);
		if (COM_CheckParm("-fullscreen"))
			Cvar_SetValueQuick(&vid_fullscreen, true);
		width = 0;
		height = 0;
		if ((i = COM_CheckParm("-width")) != 0)
			width = atoi(com_argv[i+1]);
		if ((i = COM_CheckParm("-height")) != 0)
			height = atoi(com_argv[i+1]);
		if (width == 0)
			width = height * 4 / 3;
		if (height == 0)
			height = width * 3 / 4;
		if (width)
			Cvar_SetValueQuick(&vid_width, width);
		if (height)
			Cvar_SetValueQuick(&vid_height, height);
		if ((i = COM_CheckParm("-bpp")) != 0)
			Cvar_SetQuick(&vid_bitsperpixel, com_argv[i+1]);
	}

	Con_DPrintf("Starting video system\n");
	success = VID_Mode(vid_fullscreen.integer, vid_width.integer, vid_height.integer, vid_bitsperpixel.integer);
	if (!success)
	{
		Con_Printf("Desired video mode fail, trying fallbacks...\n");
		if (!success && vid_bitsperpixel.integer > 16)
			success = VID_Mode(vid_fullscreen.integer, vid_width.integer, vid_height.integer, 16);
		if (!success && (vid_width.integer > 640 || vid_height.integer > 480))
			success = VID_Mode(vid_fullscreen.integer, 640, 480, 16);
		if (!success && vid_fullscreen.integer)
			success = VID_Mode(false, 640, 480, 16);
		if (!success)
			Sys_Error("Video modes failed\n");
	}
	VID_OpenSystems();
}

void VID_Close(void)
{
	VID_CloseSystems();
	VID_Shutdown();
}