#include "utils/logger.h"
#include "render/gl_shared.h"
#include "render/render_shared.h"

const char *GL_ErrorString( int err )
{
	switch( err )
	{
	case GL_STACK_OVERFLOW:
		return "GL_STACK_OVERFLOW";
	case GL_STACK_UNDERFLOW:
		return "GL_STACK_UNDERFLOW";
	case GL_INVALID_ENUM:
		return "GL_INVALID_ENUM";
	case GL_INVALID_VALUE:
		return "GL_INVALID_VALUE";
	case GL_INVALID_OPERATION:
		return "GL_INVALID_OPERATION";
	case GL_OUT_OF_MEMORY:
		return "GL_OUT_OF_MEMORY";
	default:
		return "UNKNOWN ERROR";
	}
}

void GL_CheckError()
{
	GLenum err;
	if ( (err = glGetError()) != GL_NO_ERROR )
		Msg( "OpenGL Error: %s", GL_ErrorString( err ) );// Msg("OpenGL Error: %s [%s]\n", GL_ErrorString(err), GL_TargetToString(tex->target));
}

void GL_CheckErrorEx( const char* filename, int line )
{
	GLenum err;
	if ( (err = glGetError()) != GL_NO_ERROR )
		Msg( "OpenGL Error: %s at %s:%i", GL_ErrorString( err ), filename, line );// Msg("OpenGL Error: %s [%s]\n", GL_ErrorString(err), GL_TargetToString(tex->target));
}

void GL_CheckErrorFunction(const char* expression, const char* filename, int line)
{
	GLenum err;
	if ( (err = glGetError()) != GL_NO_ERROR )
		Msg( "OpenGL Error: %s (%s) at %s:%i", expression, GL_ErrorString( err ), filename, line );// Msg("OpenGL Error: %s [%s]\n", GL_ErrorString(err), GL_TargetToString(tex->target));
}

void GL_SetTexture( int slot, uint texture )
{
}

uint GetGLBlendFactor(BlendFactor factor)
{
	switch (factor)
	{
	case BF_ZERO:
		return GL_ZERO;
	case BF_ONE:
		return GL_ONE;
	case BF_SRC_COLOR:
		return GL_SRC_COLOR;
	case BF_ONE_MINUS_SRC_COLOR:
		return GL_ONE_MINUS_SRC_COLOR;
	case BF_DST_COLOR:
		return GL_DST_COLOR;
	case BF_ONE_MINUS_DST_COLOR:
		return GL_ONE_MINUS_DST_COLOR;
	case BF_SRC_ALPHA:
		return GL_SRC_ALPHA;
	case BF_ONE_MINUS_SRC_ALPHA:
		return GL_ONE_MINUS_SRC_ALPHA;
	case BF_DST_ALPHA:
		return GL_DST_ALPHA;
	case BF_ONE_MINUS_DST_ALPHA:
		return GL_ONE_MINUS_DST_ALPHA;
	case BF_CONSTANT_COLOR:
		return GL_CONSTANT_COLOR;
	case BF_ONE_MINUS_CONSTANT_COLOR:
		return GL_ONE_MINUS_CONSTANT_COLOR;
	case BF_CONSTANT_ALPHA:
		return GL_CONSTANT_ALPHA;
	case BF_ONE_MINUS_CONSTANT_ALPHA:
		return GL_ONE_MINUS_CONSTANT_ALPHA;
	default:
		break;
	}

	return 0;
}


#define LOAD_GL_FUNC(functype, funcname) \
{ \
	funcname = (functype)wglGetProcAddress(#funcname); \
	if (funcname == NULL) \
		LogMsg("Failed to load %s", #funcname); \
}

void GL_Load()
{
	// OpenGL 1.5
	LOAD_GL_FUNC(PFNGLGENQUERIESPROC, glGenQueries);
	LOAD_GL_FUNC(PFNGLDELETEQUERIESPROC, glDeleteQueries);
	LOAD_GL_FUNC(PFNGLISQUERYPROC, glIsQuery);
	LOAD_GL_FUNC(PFNGLBEGINQUERYPROC, glBeginQuery);
	LOAD_GL_FUNC(PFNGLENDQUERYPROC, glEndQuery);
	LOAD_GL_FUNC(PFNGLGETQUERYIVPROC, glGetQueryiv);
	LOAD_GL_FUNC(PFNGLGETQUERYOBJECTIVPROC, glGetQueryObjectiv);
	LOAD_GL_FUNC(PFNGLGETQUERYOBJECTUIVPROC, glGetQueryObjectuiv);
	LOAD_GL_FUNC(PFNGLBINDBUFFERPROC, glBindBuffer);
	LOAD_GL_FUNC(PFNGLDELETEBUFFERSPROC, glDeleteBuffers);
	LOAD_GL_FUNC(PFNGLGENBUFFERSPROC, glGenBuffers);
	LOAD_GL_FUNC(PFNGLISBUFFERPROC, glIsBuffer);
	LOAD_GL_FUNC(PFNGLBUFFERDATAPROC, glBufferData);
	LOAD_GL_FUNC(PFNGLBUFFERSUBDATAPROC, glBufferSubData);
	LOAD_GL_FUNC(PFNGLGETBUFFERSUBDATAPROC, glGetBufferSubData);
	LOAD_GL_FUNC(PFNGLMAPBUFFERPROC, glMapBuffer);
	LOAD_GL_FUNC(PFNGLUNMAPBUFFERPROC, glUnmapBuffer);
	LOAD_GL_FUNC(PFNGLGETBUFFERPARAMETERIVPROC, glGetBufferParameteriv);
	LOAD_GL_FUNC(PFNGLGETBUFFERPOINTERVPROC, glGetBufferPointerv);
	
}

PFNGLGENQUERIESPROC glGenQueries = NULL;
PFNGLDELETEQUERIESPROC glDeleteQueries = NULL;
PFNGLISQUERYPROC glIsQuery = NULL;
PFNGLBEGINQUERYPROC glBeginQuery = NULL;
PFNGLENDQUERYPROC glEndQuery = NULL;
PFNGLGETQUERYIVPROC glGetQueryiv = NULL;
PFNGLGETQUERYOBJECTIVPROC glGetQueryObjectiv = NULL;
PFNGLGETQUERYOBJECTUIVPROC glGetQueryObjectuiv = NULL;
PFNGLBINDBUFFERPROC glBindBuffer = NULL;
PFNGLDELETEBUFFERSPROC glDeleteBuffers = NULL;
PFNGLGENBUFFERSPROC glGenBuffers = NULL;
PFNGLISBUFFERPROC glIsBuffer = NULL;
PFNGLBUFFERDATAPROC glBufferData = NULL;
PFNGLBUFFERSUBDATAPROC glBufferSubData = NULL;
PFNGLGETBUFFERSUBDATAPROC glGetBufferSubData = NULL;
PFNGLMAPBUFFERPROC glMapBuffer = NULL;
PFNGLUNMAPBUFFERPROC glUnmapBuffer = NULL;
PFNGLGETBUFFERPARAMETERIVPROC glGetBufferParameteriv = NULL;
PFNGLGETBUFFERPOINTERVPROC glGetBufferPointerv = NULL;