//-----------------------------------------------------------------------------
// V12 Engine
// 
// Copyright (c) 2001 GarageGames.Com
// Portions Copyright (c) 2001 by Sierra Online, Inc.
//-----------------------------------------------------------------------------

#ifndef _PLATFORMGL_H_
#define _PLATFORMGL_H_

#include <gl.h>
#include <glu.h>


bool QGL_EXT_Init();


struct GLState
{
   bool suppARBMultitexture;
   bool suppPackedPixels;
   bool suppLockedArrays;
   bool suppTextureEnvCombine;
   bool suppVertexArrayRange;
   bool suppFogCoord;
   bool suppEdgeClamp;
};

extern GLState gGLState;
#define UNSIGNED_SHORT_5_6_5 0x8363
#define UNSIGNED_SHORT_5_6_5_REV 0x8364

extern bool gOpenGLDisableCVA;
extern bool gOpenGLDisableTEC;
extern bool gOpenGLDisableARBMT;
extern bool gOpenGLDisableFC;

inline bool dglDoesSupportCompiledVertexArray() 
{
   return gGLState.suppLockedArrays && (gOpenGLDisableCVA == false);
}

inline bool dglDoesSupportTextureEnvCombine()
{
   return gGLState.suppTextureEnvCombine && (gOpenGLDisableTEC == false);
}

inline bool dglDoesSupportARBMultitexture()
{
   return gGLState.suppARBMultitexture && (gOpenGLDisableARBMT == false);
}

inline bool dglDoesSupportVertexArrayRange()
{
   return gGLState.suppVertexArrayRange;
}

inline bool dglDoesSupportFogCoord()
{
   return gGLState.suppFogCoord && (gOpenGLDisableFC == false);
}

inline bool dglDoesSupportEdgeClamp()
{
   return gGLState.suppEdgeClamp;
}




//
// until Apple exposes some extensions we'll need to stub them here
//

/* EXT_combine */
#define GL_COMBINE_EXT                    0x8570
#define GL_COMBINE_RGB_EXT                0x8571
#define GL_COMBINE_ALPHA_EXT              0x8572
#define GL_SOURCE0_RGB_EXT                0x8580
#define GL_SOURCE1_RGB_EXT                0x8581
#define GL_SOURCE2_RGB_EXT                0x8582
#define GL_SOURCE0_ALPHA_EXT              0x8588
#define GL_SOURCE1_ALPHA_EXT              0x8589
#define GL_SOURCE2_ALPHA_EXT              0x858A
#define GL_OPERAND0_RGB_EXT               0x8590
#define GL_OPERAND1_RGB_EXT               0x8591
#define GL_OPERAND2_RGB_EXT               0x8592
#define GL_OPERAND0_ALPHA_EXT             0x8598
#define GL_OPERAND1_ALPHA_EXT             0x8599
#define GL_OPERAND2_ALPHA_EXT             0x859A
#define GL_RGB_SCALE_EXT                  0x8573
#define GL_ADD_SIGNED_EXT                 0x8574
#define GL_INTERPOLATE_EXT                0x8575
#define GL_CONSTANT_EXT                   0x8576
#define GL_PRIMARY_COLOR_EXT              0x8577
#define GL_PREVIOUS_EXT                   0x8578

/* EXT_fog_coord */
#define GL_FOG_COORDINATE_SOURCE_EXT        -1
#define GL_FOG_COORDINATE_EXT               -1
#define GL_FRAGMENT_DEPTH_EXT               -1
#define GL_FOG_COORDINATE_ARRAY_EXT         -1

/* EXT_texture_edge_clamp */
#define GL_CLAMP_TO_EDGE_EXT                 0x812F

// stubbed unsupported extensions
inline void glFogCoordfEXT(GLfloat ) {}
inline void glFogCoordPointerEXT(GLenum, GLsizei, void *) {}





#endif // _PLATFORMGL_H_