BansheeEngine/BansheeGLRenderSystem/Source/BsGLPixelFormat.cpp

#include "BsGLPixelFormat.h"
#include "BsRenderSystem.h"
#include "BsBitwise.h"
#include "BsDebug.h"

namespace BansheeEngine  
{
    GLenum GLPixelUtil::getGLOriginFormat(PixelFormat mFormat)
    {
        switch(mFormat)
        {
			case PF_R8:
				return GL_RED;
			case PF_R8G8:
				return GL_RG;
            case PF_R8G8B8:
                return GL_RGB;
            case PF_B8G8R8:
                return GL_BGR;
			case PF_R8G8B8X8:
			case PF_R8G8B8A8:
			case PF_A8R8G8B8:
			case PF_X8R8G8B8:
                return GL_RGBA;
            case PF_B8G8R8A8:
			case PF_B8G8R8X8:
			case PF_A8B8G8R8:
			case PF_X8B8G8R8:
                return GL_BGRA;
			case PF_FLOAT16_R:
                return GL_RED;
			case PF_FLOAT16_RG:
				return GL_RG;
            case PF_FLOAT16_RGB:
                return GL_RGB;
            case PF_FLOAT16_RGBA:
                return GL_RGBA;
			case PF_FLOAT32_R:
                return GL_RED;
			case PF_FLOAT32_RG:
				return GL_RG;
            case PF_FLOAT32_RGB:
                return GL_RGB;
            case PF_FLOAT32_RGBA:
                return GL_RGBA;
            case PF_DXT1:
                return GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
            case PF_DXT3:
                 return GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
            case PF_DXT5:
                 return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
            default:
                return 0;
        }
    }

    GLenum GLPixelUtil::getGLOriginDataType(PixelFormat format)
    {
        switch(format)
        {
			case PF_R8:
            case PF_R8G8B8:
            case PF_B8G8R8:
			case PF_R8G8:
				return GL_UNSIGNED_BYTE;
			case PF_X8B8G8R8:
			case PF_A8B8G8R8:
			case PF_X8R8G8B8:
            case PF_A8R8G8B8:
				return GL_UNSIGNED_INT_8_8_8_8;
            case PF_B8G8R8A8:
			case PF_B8G8R8X8:
			case PF_R8G8B8A8:
			case PF_R8G8B8X8:
				return GL_UNSIGNED_INT_8_8_8_8_REV;
			case PF_FLOAT16_R:
			case PF_FLOAT16_RG:
            case PF_FLOAT16_RGB:
            case PF_FLOAT16_RGBA:
                return GL_HALF_FLOAT;
			case PF_FLOAT32_R:
			case PF_FLOAT32_RG:
            case PF_FLOAT32_RGB:
            case PF_FLOAT32_RGBA:
                return GL_FLOAT;
            default:
                return 0;
        }
    }

	GLenum GLPixelUtil::getBaseFormatFromCompressedInternalFormat(GLenum internalFormat)
	{
		 switch(internalFormat) 
		 {
		 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
		 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
		 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
		 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
		 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
		 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
			 return GL_RGBA;
		 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
		 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
			 return GL_RGB;
		 case GL_COMPRESSED_RED_RGTC1:
		 case GL_COMPRESSED_SIGNED_RED_RGTC1:
			 return GL_RED;
		 case GL_COMPRESSED_RG_RGTC2:
		 case GL_COMPRESSED_SIGNED_RG_RGTC2:
			 return GL_RG;
		 }

		 return GL_RGBA;
	}
    
    GLenum GLPixelUtil::getGLInternalFormat(PixelFormat mFormat, bool hwGamma)
    {
        switch(mFormat) {
            case PF_R8:
                return GL_R8;
			case PF_R8G8:
				return GL_RG8;
            case PF_R8G8B8:
            case PF_B8G8R8:
			case PF_B8G8R8X8:
			case PF_R8G8B8X8:
				if (hwGamma)
					return GL_SRGB8;
				else
					return GL_RGB8;
            case PF_B8G8R8A8:
			case PF_R8G8B8A8:
				if (hwGamma)
					return GL_SRGB8_ALPHA8;
				else
					return GL_RGBA8;
			case PF_FLOAT16_R:
				return GL_R16F;
            case PF_FLOAT16_RGB:
                return GL_RGB16F;
			case PF_FLOAT16_RG: 
				return GL_RG16F;
            case PF_FLOAT16_RGBA:
                return GL_RGBA16F;
			case PF_FLOAT32_R:
				return GL_R32F;
			case PF_FLOAT32_RG:
				return GL_RG32F;
            case PF_FLOAT32_RGB:
                return GL_RGB32F;
            case PF_FLOAT32_RGBA:
                return GL_RGBA32F;
			case PF_DXT1:
				if (hwGamma)
					return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
				else
					return GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
            case PF_DXT3:
				if (hwGamma)
					return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
				else
	                return GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
            case PF_DXT5:
				if (hwGamma)
					return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
				else
	                return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
			case PF_D16:
				return GL_DEPTH_COMPONENT16;
			case PF_D32:
				return GL_DEPTH_COMPONENT32F;
			case PF_D24S8:
				return GL_DEPTH24_STENCIL8;
			case PF_D32_S8X24:
				return GL_DEPTH32F_STENCIL8;
            default:
                return GL_NONE;
        }
    }

    GLenum GLPixelUtil::getClosestGLInternalFormat(PixelFormat mFormat, bool hwGamma)
    {
        GLenum format = getGLInternalFormat(mFormat, hwGamma);
        if(format==GL_NONE)
		{
			if (hwGamma)
				return GL_SRGB8;
			else
				return GL_RGBA8;
		}
        else
            return format;
    }

	GLenum GLPixelUtil::getDepthStencilTypeFromFormat(PixelFormat mFormat)
	{
		switch(mFormat)
		{
		case PF_D32_S8X24:
			return GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
		case PF_D24S8:
			return GL_UNSIGNED_INT_24_8;
		case PF_D32:
			return GL_FLOAT;
		case PF_D16:
			return GL_UNSIGNED_SHORT;
		}

		BS_EXCEPT(InvalidParametersException, "Invalid depth stencil format");
	}
		
	PixelFormat GLPixelUtil::getClosestEngineFormat(GLenum fmt)
	{
		switch(fmt) 
		{
		case GL_R8:
			return PF_R8;
		case GL_RG8:
			return PF_R8G8;
		case GL_RGB8:
		case GL_SRGB8:
			return PF_R8G8B8X8;
		case GL_RGBA8:
		case GL_SRGB8_ALPHA8:
			return PF_R8G8B8A8;
		case GL_R16F:
			return PF_FLOAT16_R;
		case GL_RG16F:
			return PF_FLOAT16_RG;
		case GL_RG32F:
			return PF_FLOAT32_RG;
		case GL_R32F:
			return PF_FLOAT32_R;
		case GL_RGB16F:
			return PF_FLOAT16_RGB;
		case GL_RGBA16F:
			return PF_FLOAT16_RGBA;
		case GL_RGB32F:
			return PF_FLOAT32_RGB;
		case GL_RGBA32F:
			return PF_FLOAT32_RGBA;
		case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
		case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
		case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
		case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
			return PF_DXT1;
		case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
		case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
			return PF_DXT3;
		case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
		case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
			return PF_DXT5;
		case GL_DEPTH_COMPONENT16:
			return PF_D16;
		case GL_DEPTH_COMPONENT32F:
			return PF_D32;
		case GL_DEPTH24_STENCIL8:
			return PF_D24S8;
		case GL_DEPTH32F_STENCIL8:
			return PF_D32_S8X24;
		default:
			return PF_R8G8B8A8;
		};
	}

	PixelFormat GLPixelUtil::getClosestValidFormat(PixelFormat fmt)
	{
		switch(fmt) 
		{
		case PF_R8:
			return PF_R8;
		case PF_R8G8:
			return PF_R8G8;
		case PF_R8G8B8:
		case PF_B8G8R8:
		case PF_B8G8R8X8:
		case PF_R8G8B8X8:
			return PF_R8G8B8X8;
		case PF_B8G8R8A8:
		case PF_R8G8B8A8:
			return PF_R8G8B8A8;
		case PF_FLOAT16_R:
			return PF_FLOAT16_R;
		case PF_FLOAT16_RGB:
			return PF_FLOAT16_RGB;
		case PF_FLOAT16_RG: 
			return PF_FLOAT16_RG;
		case PF_FLOAT16_RGBA:
			return PF_FLOAT16_RGBA;
		case PF_FLOAT32_R:
			return PF_FLOAT32_R;
		case PF_FLOAT32_RG:
			return PF_FLOAT32_RG;
		case PF_FLOAT32_RGB:
			return PF_FLOAT32_RGB;
		case PF_FLOAT32_RGBA:
			return PF_FLOAT32_RGBA;
		case PF_DXT1:
			return PF_DXT1;
		case PF_DXT3:
			return PF_DXT3;
		case PF_DXT5:
			return PF_DXT5;
		case PF_D16:
			return PF_D16;
		case PF_D32:
			return PF_D32;
		case PF_D24S8:
			return PF_D24S8;
		case PF_D32_S8X24:
			return PF_D32_S8X24;
		default:
			return PF_UNKNOWN;
		}
	}

    UINT32 GLPixelUtil::optionalPO2(UINT32 value)
    {
        const RenderSystemCapabilities *caps = BansheeEngine::RenderSystem::instancePtr()->getCapabilities();
        if(caps->hasCapability(RSC_NON_POWER_OF_2_TEXTURES))
            return value;
        else
            return Bitwise::firstPO2From((UINT32)value);
    }
};