//-----------------------------------------------------------------------------
// Copyright (c) 2013 GarageGames, LLC
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//-----------------------------------------------------------------------------

#ifndef _PLATFORMGL_H_
#define _PLATFORMGL_H_

//put this here so the GUI can get to it
//<--%PUAP% -Mat add #defines for min window/resolution size
#define MIN_RESOLUTION_X			320
#define MIN_RESOLUTION_Y			320//for 230 x 480 or 480 x 320
#define MIN_RESOLUTION_BIT_DEPTH	32
#define MIN_RESOLUTION_XY_STRING	"320 320"
//%PUAP%-->

/// We use the standard Apple OpenGL framework headers.
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#include <OpenGL/glext.h>

/// Allows outline mode drawing via a function pointer swapping trick.
/// Must be included AFTER all the OpenGL headers.
#include "platformOSX/osxOutlineGL.h"


//------------------------------------------------------------------------------
/// This is legacy stuff for the d3d wrapper layer.
// The code that requires these stubs should probably be ifdef'd out of any non w32 build
//------------------------------------------------------------------------------
extern GLboolean glAvailableVertexBufferEXT();
extern GLint glAllocateVertexBufferEXT(GLsizei size, GLint format, GLboolean preserve);
extern void* glLockVertexBufferEXT(GLint handle, GLsizei size);
extern void glUnlockVertexBufferEXT(GLint handle);
extern void glSetVertexBufferEXT(GLint handle);
extern void glOffsetVertexBufferEXT(GLint handle, GLuint offset);
extern void glFillVertexBufferEXT(GLint handle, GLint first, GLsizei count);
extern void glFreeVertexBufferEXT(GLint handle);
// these are extensions for glAllocateVertexBufferEXT
#define GL_V12MTVFMT_EXT                      0x8702
#define GL_V12MTNVFMT_EXT                     0x8703
#define GL_V12FTVFMT_EXT                      0x8704
#define GL_V12FMTVFMT_EXT                     0x8705
//------------------------------------------------------------------------------

// make sure this is defined, as we need to use it when around.
// some versions of OSX only define the SGIS version ( same hexcode )
#ifndef GL_CLAMP_TO_EDGE_EXT
#define GL_CLAMP_TO_EDGE_EXT                     0x812F
#endif

//10.6 (snow leopard) apparently doesnt have this,
//"GL_COLOR_INDEX8_EXT Not defined as GL_EXT_paletted_texture is deprecated"
//many links online complaining and the fix is obvious - Sven
#ifndef GL_COLOR_INDEX8_EXT
#define GL_COLOR_INDEX8_EXT 0x80E5
#endif

//Same problem as above, 10.6 
#ifndef glColorTableEXT
#define glColorTableEXT glColorTable
#endif //glColorTableEXT

/// GL state information.
struct GLState
{
   bool suppARBMultitexture;
   bool suppEXTblendcolor;
   bool suppEXTblendminmax;
   bool suppPackedPixels;
   bool suppTexEnvAdd;
   bool suppLockedArrays;

   bool suppTextureEnvCombine;
   bool suppVertexArrayRange;
   bool suppFogCoord;
   bool suppEdgeClamp;

   bool suppTextureCompression;
   bool suppS3TC;
   bool suppFXT1;
   bool suppTexAnisotropic;

   bool suppPalettedTexture;
   bool suppVertexBuffer;
   bool suppSwapInterval;

   GLint maxFSAASamples;

   unsigned int triCount[4];
   unsigned int primCount[4];
   unsigned int primMode; // 0-3

   GLfloat maxAnisotropy;
   GLint   maxTextureUnits;
};

extern GLState gGLState;

extern bool gOpenGLDisablePT;
extern bool gOpenGLDisableCVA;
extern bool gOpenGLDisableTEC;
extern bool gOpenGLDisableARBMT;
extern bool gOpenGLDisableFC;
extern bool gOpenGLDisableTCompress;
extern bool gOpenGLNoEnvColor;
extern float gOpenGLGammaCorrection;
extern bool gOpenGLNoDrawArraysAlpha;

//------------------------------------------------------------------------------
/// Inline state getters for dgl
//------------------------------------------------------------------------------
inline void dglSetRenderPrimType(unsigned int type)
{
   gGLState.primMode = type;
}

inline void dglClearPrimMetrics()
{
   for(int i = 0; i < 4; i++)
      gGLState.triCount[i] = gGLState.primCount[i] = 0;
}

inline bool dglDoesSupportPalettedTexture()
{
   return gGLState.suppPalettedTexture && (gOpenGLDisablePT == false);
}

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 dglDoesSupportEXTBlendColor()
{
   return gGLState.suppEXTblendcolor;
}

inline bool dglDoesSupportEXTBlendMinMax()
{
   return gGLState.suppEXTblendminmax;
}

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

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

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

inline bool dglDoesSupportTextureCompression()
{
   return gGLState.suppTextureCompression && (gOpenGLDisableTCompress == false);
}

inline bool dglDoesSupportS3TC()
{
   return gGLState.suppS3TC;
}

inline bool dglDoesSupportFXT1()
{
   return gGLState.suppFXT1;
}

inline bool dglDoesSupportTexEnvAdd()
{
   return gGLState.suppTexEnvAdd;
}

inline bool dglDoesSupportTexAnisotropy()
{
   return gGLState.suppTexAnisotropic;
}

inline bool dglDoesSupportVertexBuffer()
{
   return false;
}

inline GLfloat dglGetMaxAnisotropy()
{
   return gGLState.maxAnisotropy;
}

inline GLint dglGetMaxTextureUnits()
{
   if (dglDoesSupportARBMultitexture())
      return gGLState.maxTextureUnits;
   else
      return 1; 
}

//------------------------------------------------------------------------------
/// For radeon cards we can do fast FSAA mode switching.
/// Sets Full Scene Anti-Aliasing (FSAA) samples ( 1x, 2x, 4x ) via aglSetInteger()
//------------------------------------------------------------------------------
#define ATI_FSAA_LEVEL ((unsigned long)510)  
void dglSetFSAASamples(GLint aasamp);

void getGLCapabilities();

#endif // _PLATFORMGL_H_