//  @ Project : OpenGL ES Wrapper
//  @ File Name : eglConfigWrapper.h
//  @ Date : 2006-7-5
//  @ Author : kongfu.yang
//  @ Company : http://www.play3d.net
//  @ Copyright : 2006-7, Example source license. By keep this header comment, you may use this source file in your project for non-commicial or commicial purpose.


#ifndef _EGL_CONFIG_WRAPPER_H_
#define _EGL_CONFIG_WRAPPER_H_

#include <gles/egl.h>

#define MAX_ATTRIBUTES_OF_CONFIG 0x30

struct ConfigAttribute
{
		EGLint id;
		EGLint value;
		TCHAR * name;
        TCHAR * explain;
};

class ConfigDescription 
{
public:
  ConfigAttribute attributes[MAX_ATTRIBUTES_OF_CONFIG];

  ConfigDescription()
  {
	  init();
  }

  void init()
  {
	  int i = 0;

	  attributes[i].id = EGL_BUFFER_SIZE; 
	  attributes[i].name = TEXT("EGL_BUFFER_SIZE");
      attributes[i++].explain = TEXT("color buffer bits, r+g+b+ alpha");

	  attributes[i].id = EGL_ALPHA_SIZE;
	  attributes[i].name = TEXT("EGL_ALPHA_SIZE");
      attributes[i++].explain = TEXT("bits for alpha");

	  attributes[i].id = EGL_BLUE_SIZE;
	  attributes[i].name = TEXT("EGL_BLUE_SIZE");
      attributes[i++].explain = TEXT("blue color bits");

	  attributes[i].id = EGL_GREEN_SIZE;
	  attributes[i].name = TEXT("EGL_GREEN_SIZE");
      attributes[i++].explain = TEXT("green color bits");

	  attributes[i].id = EGL_RED_SIZE;
	  attributes[i].name = TEXT("EGL_RED_SIZE");
      attributes[i++].explain = TEXT("red color bits");

	  attributes[i].id = EGL_DEPTH_SIZE;
	  attributes[i].name = TEXT("EGL_DEPTH_SIZE");
      attributes[i++].explain = TEXT("z buffer depth");

	  attributes[i].id = EGL_STENCIL_SIZE;
	  attributes[i].name = TEXT("EGL_STENCIL_SIZE");
      attributes[i++].explain = TEXT("stancil bits per pixel");

	  attributes[i].id = EGL_CONFIG_CAVEAT;
	  attributes[i].name = TEXT("EGL_CONFIG_CAVEAT");
      attributes[i++].explain = TEXT("side effect of the config, EGL_NONE(0x3038), EGL_SLOW_CONFIG(0x3050), EGL_NON_COMFORMANT_CONFIG(0x3051,native optimized, but failed to EGL standard comformant test)");

	  attributes[i].id = EGL_CONFIG_ID;
	  attributes[i].name = TEXT("EGL_CONFIG_ID");
      attributes[i++].explain = TEXT("given config ID");

	  attributes[i].id = EGL_LEVEL;
	  attributes[i].name = TEXT("EGL_LEVEL");
      attributes[i++].explain = TEXT("0 is defalt, <0 underlay, >0 overlay");

	  attributes[i].id = EGL_MAX_PBUFFER_PIXELS;
	  attributes[i].name = TEXT("EGL_MAX_PBUFFER_PIXELS");
      attributes[i++].explain = TEXT("maximum pixels in a pbuffer,  maybe not max_width * max_height");

	  attributes[i].id = EGL_MAX_PBUFFER_HEIGHT;
	  attributes[i].name = TEXT("EGL_MAX_PBUFFER_HEIGHT");
      attributes[i++].explain = TEXT("maximum pixels in y direction");

	  attributes[i].id = EGL_MAX_PBUFFER_WIDTH;
	  attributes[i].name = TEXT("EGL_MAX_PBUFFER_WIDTH");
      attributes[i++].explain = TEXT("maximum pixels in x direction");

	  attributes[i].id = EGL_NATIVE_RENDERABLE;
	  attributes[i].name = TEXT("EGL_NATIVE_RENDERABLE");
      attributes[i++].explain = TEXT("native API (GDI) can draw on EGL surface");

	  attributes[i].id = EGL_NATIVE_VISUAL_ID;
	  attributes[i].name = TEXT("EGL_NATIVE_VISUAL_ID");
      attributes[i++].explain = TEXT("native visual (pixel format) ID");

	  attributes[i].id = EGL_NATIVE_VISUAL_TYPE;
	  attributes[i].name = TEXT("EGL_NATIVE_VISUAL_TYPE");
      attributes[i++].explain = TEXT("native visual type (PIXELFORMAT) ?");

	  attributes[i].id = EGL_SAMPLES;
	  attributes[i].name = TEXT("EGL_SAMPLES");
      attributes[i++].explain = TEXT("sample count required by a multisampling buffer. 0 if none sample buffer");

	  attributes[i].id = EGL_SAMPLE_BUFFERS;
	  attributes[i].name = TEXT("EGL_SAMPLE_BUFFERS");
      attributes[i++].explain = TEXT("number of multisampling buffers");

	  attributes[i].id = EGL_SURFACE_TYPE;
	  attributes[i].name = TEXT("EGL_SURFACE_TYPE");
      attributes[i++].explain = TEXT("supported surface type in config, EGL_WINDOW_BIT(1)|EGL_PIXMAP_BIT(2)|EGL_PBUFFER_BIT(4)");

	  attributes[i].id = EGL_TRANSPARENT_TYPE;
	  attributes[i].name = TEXT("EGL_TRANSPARENT_TYPE");
      attributes[i++].explain = TEXT("support a special color as transparent. EGL_NONE(0x3038),EGL_TRANSPARENT_RGB(0x3052)");

	  attributes[i].id = EGL_TRANSPARENT_BLUE_VALUE;
	  attributes[i].name = TEXT("EGL_TRANSPARENT_BLUE_VALUE");
      attributes[i++].explain = TEXT("blue component of transparent color");

	  attributes[i].id = EGL_TRANSPARENT_GREEN_VALUE;
	  attributes[i].name = TEXT("EGL_TRANSPARENT_GREEN_VALUE");
      attributes[i++].explain = TEXT("green component of transparent color");

	  attributes[i].id = EGL_TRANSPARENT_RED_VALUE;
	  attributes[i].name = TEXT("EGL_TRANSPARENT_RED_VALUE");
      attributes[i++].explain = TEXT("red component of transparent color");

	  // EGL 1.1
	  attributes[i].id = EGL_BIND_TO_TEXTURE_RGB;
	  attributes[i].name = TEXT("EGL_BIND_TO_TEXTURE_RGB");
      attributes[i++].explain = TEXT("true if bindalble to RGB texture");

	  attributes[i].id = EGL_BIND_TO_TEXTURE_RGBA;
	  attributes[i].name = TEXT("EGL_BIND_TO_TEXTURE_RGBA");
      attributes[i++].explain = TEXT("true if bindalbe to RGBA texture");

	  attributes[i].id = EGL_MIN_SWAP_INTERVAL;
	  attributes[i].name = TEXT("EGL_MIN_SWAP_INTERVAL");
      attributes[i++].explain = TEXT("minimum swap interval");

	  attributes[i].id = EGL_MAX_SWAP_INTERVAL;
	  attributes[i].name = TEXT("EGL_MAX_SWAP_INTERVAL");
      attributes[i++].explain = TEXT("maximum swap interval");

	  attributes[i].id = 0;
      attributes[i].value = 0;
	  attributes[i].name = 0;
      attributes[i++].explain = 0;
  }

	bool describe(EGLDisplay dpy, EGLConfig config)
	{
		for ( int i = 0; i < MAX_ATTRIBUTES_OF_CONFIG && attributes[i].id != 0; ++i )
		{
			eglGetConfigAttrib( dpy, config, attributes[i].id, &attributes[i].value);
		}

		return true;
	}
};

#endif //_EGL_CONFIG_WRAPPER_H_