michael@0: #include "precompiled.h"
michael@0: //
michael@0: // Copyright (c) 2002-2013 The ANGLE Project Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: //
michael@0: 
michael@0: // utilities.cpp: Conversion functions and other utility routines.
michael@0: 
michael@0: #include "libGLESv2/utilities.h"
michael@0: #include "libGLESv2/mathutil.h"
michael@0: 
michael@0: namespace gl
michael@0: {
michael@0: 
michael@0: int UniformComponentCount(GLenum type)
michael@0: {
michael@0:     switch (type)
michael@0:     {
michael@0:       case GL_BOOL:
michael@0:       case GL_FLOAT:
michael@0:       case GL_INT:
michael@0:       case GL_SAMPLER_2D:
michael@0:       case GL_SAMPLER_CUBE:
michael@0:           return 1;
michael@0:       case GL_BOOL_VEC2:
michael@0:       case GL_FLOAT_VEC2:
michael@0:       case GL_INT_VEC2:
michael@0:           return 2;
michael@0:       case GL_INT_VEC3:
michael@0:       case GL_FLOAT_VEC3:
michael@0:       case GL_BOOL_VEC3:
michael@0:           return 3;
michael@0:       case GL_BOOL_VEC4:
michael@0:       case GL_FLOAT_VEC4:
michael@0:       case GL_INT_VEC4:
michael@0:       case GL_FLOAT_MAT2:
michael@0:           return 4;
michael@0:       case GL_FLOAT_MAT3:
michael@0:           return 9;
michael@0:       case GL_FLOAT_MAT4:
michael@0:           return 16;
michael@0:       default:
michael@0:           UNREACHABLE();
michael@0:     }
michael@0: 
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: GLenum UniformComponentType(GLenum type)
michael@0: {
michael@0:     switch(type)
michael@0:     {
michael@0:       case GL_BOOL:
michael@0:       case GL_BOOL_VEC2:
michael@0:       case GL_BOOL_VEC3:
michael@0:       case GL_BOOL_VEC4:
michael@0:           return GL_BOOL;
michael@0:       case GL_FLOAT:
michael@0:       case GL_FLOAT_VEC2:
michael@0:       case GL_FLOAT_VEC3:
michael@0:       case GL_FLOAT_VEC4:
michael@0:       case GL_FLOAT_MAT2:
michael@0:       case GL_FLOAT_MAT3:
michael@0:       case GL_FLOAT_MAT4:
michael@0:           return GL_FLOAT;
michael@0:       case GL_INT:
michael@0:       case GL_SAMPLER_2D:
michael@0:       case GL_SAMPLER_CUBE:
michael@0:       case GL_INT_VEC2:
michael@0:       case GL_INT_VEC3:
michael@0:       case GL_INT_VEC4:
michael@0:           return GL_INT;
michael@0:       default:
michael@0:           UNREACHABLE();
michael@0:     }
michael@0: 
michael@0:     return GL_NONE;
michael@0: }
michael@0: 
michael@0: size_t UniformComponentSize(GLenum type)
michael@0: {
michael@0:     switch(type)
michael@0:     {
michael@0:       case GL_BOOL:  return sizeof(GLint);
michael@0:       case GL_FLOAT: return sizeof(GLfloat);
michael@0:       case GL_INT:   return sizeof(GLint);
michael@0:       default:       UNREACHABLE();
michael@0:     }
michael@0: 
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: size_t UniformInternalSize(GLenum type)
michael@0: {
michael@0:     // Expanded to 4-element vectors
michael@0:     return UniformComponentSize(UniformComponentType(type)) * VariableRowCount(type) * 4;
michael@0: }
michael@0: 
michael@0: size_t UniformExternalSize(GLenum type)
michael@0: {
michael@0:     return UniformComponentSize(UniformComponentType(type)) * UniformComponentCount(type);
michael@0: }
michael@0: 
michael@0: int VariableRowCount(GLenum type)
michael@0: {
michael@0:     switch (type)
michael@0:     {
michael@0:       case GL_NONE:
michael@0:         return 0;
michael@0:       case GL_BOOL:
michael@0:       case GL_FLOAT:
michael@0:       case GL_INT:
michael@0:       case GL_BOOL_VEC2:
michael@0:       case GL_FLOAT_VEC2:
michael@0:       case GL_INT_VEC2:
michael@0:       case GL_INT_VEC3:
michael@0:       case GL_FLOAT_VEC3:
michael@0:       case GL_BOOL_VEC3:
michael@0:       case GL_BOOL_VEC4:
michael@0:       case GL_FLOAT_VEC4:
michael@0:       case GL_INT_VEC4:
michael@0:       case GL_SAMPLER_2D:
michael@0:       case GL_SAMPLER_CUBE:
michael@0:         return 1;
michael@0:       case GL_FLOAT_MAT2:
michael@0:         return 2;
michael@0:       case GL_FLOAT_MAT3:
michael@0:         return 3;
michael@0:       case GL_FLOAT_MAT4:
michael@0:         return 4;
michael@0:       default:
michael@0:         UNREACHABLE();
michael@0:     }
michael@0: 
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: int VariableColumnCount(GLenum type)
michael@0: {
michael@0:     switch (type)
michael@0:     {
michael@0:       case GL_NONE:
michael@0:         return 0;
michael@0:       case GL_BOOL:
michael@0:       case GL_FLOAT:
michael@0:       case GL_INT:
michael@0:       case GL_SAMPLER_2D:
michael@0:       case GL_SAMPLER_CUBE:
michael@0:         return 1;
michael@0:       case GL_BOOL_VEC2:
michael@0:       case GL_FLOAT_VEC2:
michael@0:       case GL_INT_VEC2:
michael@0:       case GL_FLOAT_MAT2:
michael@0:         return 2;
michael@0:       case GL_INT_VEC3:
michael@0:       case GL_FLOAT_VEC3:
michael@0:       case GL_BOOL_VEC3:
michael@0:       case GL_FLOAT_MAT3:
michael@0:         return 3;
michael@0:       case GL_BOOL_VEC4:
michael@0:       case GL_FLOAT_VEC4:
michael@0:       case GL_INT_VEC4:
michael@0:       case GL_FLOAT_MAT4:
michael@0:         return 4;
michael@0:       default:
michael@0:         UNREACHABLE();
michael@0:     }
michael@0: 
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: int AllocateFirstFreeBits(unsigned int *bits, unsigned int allocationSize, unsigned int bitsSize)
michael@0: {
michael@0:     ASSERT(allocationSize <= bitsSize);
michael@0: 
michael@0:     unsigned int mask = std::numeric_limits<unsigned int>::max() >> (std::numeric_limits<unsigned int>::digits - allocationSize);
michael@0: 
michael@0:     for (unsigned int i = 0; i < bitsSize - allocationSize + 1; i++)
michael@0:     {
michael@0:         if ((*bits & mask) == 0)
michael@0:         {
michael@0:             *bits |= mask;
michael@0:             return i;
michael@0:         }
michael@0: 
michael@0:         mask <<= 1;
michael@0:     }
michael@0: 
michael@0:     return -1;
michael@0: }
michael@0: 
michael@0: GLsizei ComputePitch(GLsizei width, GLint internalformat, GLint alignment)
michael@0: {
michael@0:     ASSERT(alignment > 0 && isPow2(alignment));
michael@0: 
michael@0:     GLsizei rawPitch = ComputePixelSize(internalformat) * width;
michael@0:     return (rawPitch + alignment - 1) & ~(alignment - 1);
michael@0: }
michael@0: 
michael@0: GLsizei ComputeCompressedPitch(GLsizei width, GLenum internalformat)
michael@0: {
michael@0:     return ComputeCompressedSize(width, 1, internalformat);
michael@0: }
michael@0: 
michael@0: GLsizei ComputeCompressedSize(GLsizei width, GLsizei height, GLenum internalformat)
michael@0: {
michael@0:     switch (internalformat)
michael@0:     {
michael@0:       case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
michael@0:       case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
michael@0:         return 8 * ((width + 3) / 4) * ((height + 3) / 4);
michael@0:       case GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE:
michael@0:       case GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE:
michael@0:         return 16 * ((width + 3) / 4) * ((height + 3) / 4);
michael@0:       default:
michael@0:         return 0;
michael@0:     }
michael@0: }
michael@0: 
michael@0: GLsizei ComputeTypeSize(GLenum type)
michael@0: {
michael@0:     switch (type)
michael@0:     {
michael@0:       case GL_BYTE:                            return 1;
michael@0:       case GL_UNSIGNED_BYTE:                   return 1;
michael@0:       case GL_SHORT:                           return 2;
michael@0:       case GL_UNSIGNED_SHORT:                  return 2;
michael@0:       case GL_INT:                             return 4;
michael@0:       case GL_UNSIGNED_INT:                    return 4;
michael@0:       case GL_FLOAT:                           return 4;
michael@0:       case GL_HALF_FLOAT_OES:                  return 2;
michael@0:       case GL_UNSIGNED_SHORT_5_6_5:            return 2;
michael@0:       case GL_UNSIGNED_SHORT_4_4_4_4:          return 2;
michael@0:       case GL_UNSIGNED_SHORT_5_5_5_1:          return 2;
michael@0:       case GL_UNSIGNED_SHORT_4_4_4_4_REV_EXT:  return 2;
michael@0:       case GL_UNSIGNED_SHORT_1_5_5_5_REV_EXT:  return 2;
michael@0:       case GL_UNSIGNED_INT_2_10_10_10_REV_EXT: return 4;
michael@0:       case GL_UNSIGNED_INT_24_8_OES:           return 4;
michael@0:       default: UNREACHABLE();                  return 0;
michael@0:     }
michael@0: }
michael@0: 
michael@0: bool IsCompressed(GLenum format)
michael@0: {
michael@0:     if(format == GL_COMPRESSED_RGB_S3TC_DXT1_EXT ||
michael@0:        format == GL_COMPRESSED_RGBA_S3TC_DXT1_EXT ||
michael@0:        format == GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE ||
michael@0:        format == GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE)
michael@0:     {
michael@0:         return true;
michael@0:     }
michael@0:     else
michael@0:     {
michael@0:         return false;
michael@0:     }
michael@0: }
michael@0: 
michael@0: bool IsDepthTexture(GLenum format)
michael@0: {
michael@0:     if (format == GL_DEPTH_COMPONENT ||
michael@0:         format == GL_DEPTH_STENCIL_OES ||
michael@0:         format == GL_DEPTH_COMPONENT16 ||
michael@0:         format == GL_DEPTH_COMPONENT32_OES ||
michael@0:         format == GL_DEPTH24_STENCIL8_OES)
michael@0:     {
michael@0:         return true;
michael@0:     }
michael@0: 
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: bool IsStencilTexture(GLenum format)
michael@0: {
michael@0:     if (format == GL_DEPTH_STENCIL_OES ||
michael@0:         format == GL_DEPTH24_STENCIL8_OES)
michael@0:     {
michael@0:         return true;
michael@0:     }
michael@0: 
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: void MakeValidSize(bool isImage, bool isCompressed, GLsizei *requestWidth, GLsizei *requestHeight, int *levelOffset)
michael@0: {
michael@0:     int upsampleCount = 0;
michael@0: 
michael@0:     if (isCompressed)
michael@0:     {
michael@0:         // Don't expand the size of full textures that are at least 4x4
michael@0:         // already.
michael@0:         if (isImage || *requestWidth < 4 || *requestHeight < 4)
michael@0:         {
michael@0:             while (*requestWidth % 4 != 0 || *requestHeight % 4 != 0)
michael@0:             {
michael@0:                 *requestWidth <<= 1;
michael@0:                 *requestHeight <<= 1;
michael@0:                 upsampleCount++;
michael@0:             }
michael@0:         }
michael@0:     }
michael@0:     *levelOffset = upsampleCount;
michael@0: }
michael@0: 
michael@0: // Returns the size, in bytes, of a single texel in an Image
michael@0: int ComputePixelSize(GLint internalformat)
michael@0: {
michael@0:     switch (internalformat)
michael@0:     {
michael@0:       case GL_ALPHA8_EXT:                       return sizeof(unsigned char);
michael@0:       case GL_LUMINANCE8_EXT:                   return sizeof(unsigned char);
michael@0:       case GL_ALPHA32F_EXT:                     return sizeof(float);
michael@0:       case GL_LUMINANCE32F_EXT:                 return sizeof(float);
michael@0:       case GL_ALPHA16F_EXT:                     return sizeof(unsigned short);
michael@0:       case GL_LUMINANCE16F_EXT:                 return sizeof(unsigned short);
michael@0:       case GL_LUMINANCE8_ALPHA8_EXT:            return sizeof(unsigned char) * 2;
michael@0:       case GL_LUMINANCE_ALPHA32F_EXT:           return sizeof(float) * 2;
michael@0:       case GL_LUMINANCE_ALPHA16F_EXT:           return sizeof(unsigned short) * 2;
michael@0:       case GL_RGB8_OES:                         return sizeof(unsigned char) * 3;
michael@0:       case GL_RGB565:                           return sizeof(unsigned short);
michael@0:       case GL_RGB32F_EXT:                       return sizeof(float) * 3;
michael@0:       case GL_RGB16F_EXT:                       return sizeof(unsigned short) * 3;
michael@0:       case GL_RGBA8_OES:                        return sizeof(unsigned char) * 4;
michael@0:       case GL_RGBA4:                            return sizeof(unsigned short);
michael@0:       case GL_RGB5_A1:                          return sizeof(unsigned short);
michael@0:       case GL_RGBA32F_EXT:                      return sizeof(float) * 4;
michael@0:       case GL_RGBA16F_EXT:                      return sizeof(unsigned short) * 4;
michael@0:       case GL_BGRA8_EXT:                        return sizeof(unsigned char) * 4;
michael@0:       case GL_BGRA4_ANGLEX:                     return sizeof(unsigned short);
michael@0:       case GL_BGR5_A1_ANGLEX:                   return sizeof(unsigned short);
michael@0:       default: UNREACHABLE();
michael@0:     }
michael@0: 
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: bool IsCubemapTextureTarget(GLenum target)
michael@0: {
michael@0:     return (target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X && target <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z);
michael@0: }
michael@0: 
michael@0: bool IsInternalTextureTarget(GLenum target)
michael@0: {
michael@0:     return target == GL_TEXTURE_2D || IsCubemapTextureTarget(target);
michael@0: }
michael@0: 
michael@0: GLint ConvertSizedInternalFormat(GLenum format, GLenum type)
michael@0: {
michael@0:     switch (format)
michael@0:     {
michael@0:       case GL_ALPHA:
michael@0:         switch (type)
michael@0:         {
michael@0:           case GL_UNSIGNED_BYTE:    return GL_ALPHA8_EXT;
michael@0:           case GL_FLOAT:            return GL_ALPHA32F_EXT;
michael@0:           case GL_HALF_FLOAT_OES:   return GL_ALPHA16F_EXT;
michael@0:           default:                  UNIMPLEMENTED();
michael@0:         }
michael@0:         break;
michael@0:       case GL_LUMINANCE:
michael@0:         switch (type)
michael@0:         {
michael@0:           case GL_UNSIGNED_BYTE:    return GL_LUMINANCE8_EXT;
michael@0:           case GL_FLOAT:            return GL_LUMINANCE32F_EXT;
michael@0:           case GL_HALF_FLOAT_OES:   return GL_LUMINANCE16F_EXT;
michael@0:           default:                  UNIMPLEMENTED();
michael@0:         }
michael@0:         break;
michael@0:       case GL_LUMINANCE_ALPHA:
michael@0:         switch (type)
michael@0:         {
michael@0:           case GL_UNSIGNED_BYTE:    return GL_LUMINANCE8_ALPHA8_EXT;
michael@0:           case GL_FLOAT:            return GL_LUMINANCE_ALPHA32F_EXT;
michael@0:           case GL_HALF_FLOAT_OES:   return GL_LUMINANCE_ALPHA16F_EXT;
michael@0:           default:                  UNIMPLEMENTED();
michael@0:         }
michael@0:         break;
michael@0:       case GL_RGB:
michael@0:         switch (type)
michael@0:         {
michael@0:           case GL_UNSIGNED_BYTE:            return GL_RGB8_OES;
michael@0:           case GL_UNSIGNED_SHORT_5_6_5:     return GL_RGB565;
michael@0:           case GL_FLOAT:                    return GL_RGB32F_EXT;
michael@0:           case GL_HALF_FLOAT_OES:           return GL_RGB16F_EXT;
michael@0:           default:                          UNIMPLEMENTED();
michael@0:         }
michael@0:         break;
michael@0:       case GL_RGBA:
michael@0:         switch (type)
michael@0:         {
michael@0:           case GL_UNSIGNED_BYTE:            return GL_RGBA8_OES;
michael@0:           case GL_UNSIGNED_SHORT_4_4_4_4:   return GL_RGBA4;
michael@0:           case GL_UNSIGNED_SHORT_5_5_5_1:   return GL_RGB5_A1;
michael@0:           case GL_FLOAT:                    return GL_RGBA32F_EXT;
michael@0:           case GL_HALF_FLOAT_OES:           return GL_RGBA16F_EXT;
michael@0:             break;
michael@0:           default:                          UNIMPLEMENTED();
michael@0:         }
michael@0:         break;
michael@0:       case GL_BGRA_EXT:
michael@0:         switch (type)
michael@0:         {
michael@0:           case GL_UNSIGNED_BYTE:                    return GL_BGRA8_EXT;
michael@0:           case GL_UNSIGNED_SHORT_4_4_4_4_REV_EXT:   return GL_BGRA4_ANGLEX;
michael@0:           case GL_UNSIGNED_SHORT_1_5_5_5_REV_EXT:   return GL_BGR5_A1_ANGLEX;
michael@0:           default:                                  UNIMPLEMENTED();
michael@0:         }
michael@0:         break;
michael@0:       case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
michael@0:       case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
michael@0:       case GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE:
michael@0:       case GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE:
michael@0:         return format;
michael@0:       case GL_DEPTH_COMPONENT:
michael@0:         switch (type)
michael@0:         {
michael@0:           case GL_UNSIGNED_SHORT:           return GL_DEPTH_COMPONENT16;
michael@0:           case GL_UNSIGNED_INT:             return GL_DEPTH_COMPONENT32_OES;
michael@0:           default:                          UNIMPLEMENTED();
michael@0:         }
michael@0:         break;
michael@0:       case GL_DEPTH_STENCIL_OES:
michael@0:         switch (type)
michael@0:         {
michael@0:           case GL_UNSIGNED_INT_24_8_OES:    return GL_DEPTH24_STENCIL8_OES;
michael@0:           default:                          UNIMPLEMENTED();
michael@0:         }
michael@0:         break;
michael@0:       default:
michael@0:         UNIMPLEMENTED();
michael@0:     }
michael@0: 
michael@0:     return GL_NONE;
michael@0: }
michael@0: 
michael@0: GLenum ExtractFormat(GLenum internalformat)
michael@0: {
michael@0:     switch (internalformat)
michael@0:     {
michael@0:       case GL_RGB565:                          return GL_RGB;
michael@0:       case GL_RGBA4:                           return GL_RGBA;
michael@0:       case GL_RGB5_A1:                         return GL_RGBA;
michael@0:       case GL_RGB8_OES:                        return GL_RGB;
michael@0:       case GL_RGBA8_OES:                       return GL_RGBA;
michael@0:       case GL_LUMINANCE8_ALPHA8_EXT:           return GL_LUMINANCE_ALPHA;
michael@0:       case GL_LUMINANCE8_EXT:                  return GL_LUMINANCE;
michael@0:       case GL_ALPHA8_EXT:                      return GL_ALPHA;
michael@0:       case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:    return GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
michael@0:       case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:   return GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
michael@0:       case GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE: return GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE;
michael@0:       case GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE: return GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE;
michael@0:       case GL_RGBA32F_EXT:                     return GL_RGBA;
michael@0:       case GL_RGB32F_EXT:                      return GL_RGB;
michael@0:       case GL_ALPHA32F_EXT:                    return GL_ALPHA;
michael@0:       case GL_LUMINANCE32F_EXT:                return GL_LUMINANCE;
michael@0:       case GL_LUMINANCE_ALPHA32F_EXT:          return GL_LUMINANCE_ALPHA;
michael@0:       case GL_RGBA16F_EXT:                     return GL_RGBA;
michael@0:       case GL_RGB16F_EXT:                      return GL_RGB;
michael@0:       case GL_ALPHA16F_EXT:                    return GL_ALPHA;
michael@0:       case GL_LUMINANCE16F_EXT:                return GL_LUMINANCE;
michael@0:       case GL_LUMINANCE_ALPHA16F_EXT:          return GL_LUMINANCE_ALPHA;
michael@0:       case GL_BGRA8_EXT:                       return GL_BGRA_EXT;
michael@0:       case GL_DEPTH_COMPONENT16:               return GL_DEPTH_COMPONENT;
michael@0:       case GL_DEPTH_COMPONENT32_OES:           return GL_DEPTH_COMPONENT;
michael@0:       case GL_DEPTH24_STENCIL8_OES:            return GL_DEPTH_STENCIL_OES;
michael@0:       default:                                 return GL_NONE;   // Unsupported
michael@0:     }
michael@0: }
michael@0: 
michael@0: GLenum ExtractType(GLenum internalformat)
michael@0: {
michael@0:     switch (internalformat)
michael@0:     {
michael@0:       case GL_RGB565:                          return GL_UNSIGNED_SHORT_5_6_5;
michael@0:       case GL_RGBA4:                           return GL_UNSIGNED_SHORT_4_4_4_4;
michael@0:       case GL_RGB5_A1:                         return GL_UNSIGNED_SHORT_5_5_5_1;
michael@0:       case GL_RGB8_OES:                        return GL_UNSIGNED_BYTE;
michael@0:       case GL_RGBA8_OES:                       return GL_UNSIGNED_BYTE;
michael@0:       case GL_LUMINANCE8_ALPHA8_EXT:           return GL_UNSIGNED_BYTE;
michael@0:       case GL_LUMINANCE8_EXT:                  return GL_UNSIGNED_BYTE;
michael@0:       case GL_ALPHA8_EXT:                      return GL_UNSIGNED_BYTE;
michael@0:       case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:    return GL_UNSIGNED_BYTE;
michael@0:       case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:   return GL_UNSIGNED_BYTE;
michael@0:       case GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE: return GL_UNSIGNED_BYTE;
michael@0:       case GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE: return GL_UNSIGNED_BYTE;
michael@0:       case GL_RGBA32F_EXT:                     return GL_FLOAT;
michael@0:       case GL_RGB32F_EXT:                      return GL_FLOAT;
michael@0:       case GL_ALPHA32F_EXT:                    return GL_FLOAT;
michael@0:       case GL_LUMINANCE32F_EXT:                return GL_FLOAT;
michael@0:       case GL_LUMINANCE_ALPHA32F_EXT:          return GL_FLOAT;
michael@0:       case GL_RGBA16F_EXT:                     return GL_HALF_FLOAT_OES;
michael@0:       case GL_RGB16F_EXT:                      return GL_HALF_FLOAT_OES;
michael@0:       case GL_ALPHA16F_EXT:                    return GL_HALF_FLOAT_OES;
michael@0:       case GL_LUMINANCE16F_EXT:                return GL_HALF_FLOAT_OES;
michael@0:       case GL_LUMINANCE_ALPHA16F_EXT:          return GL_HALF_FLOAT_OES;
michael@0:       case GL_BGRA8_EXT:                       return GL_UNSIGNED_BYTE;
michael@0:       case GL_DEPTH_COMPONENT16:               return GL_UNSIGNED_SHORT;
michael@0:       case GL_DEPTH_COMPONENT32_OES:           return GL_UNSIGNED_INT;
michael@0:       case GL_DEPTH24_STENCIL8_OES:            return GL_UNSIGNED_INT_24_8_OES;
michael@0:       default:                                 return GL_NONE;   // Unsupported
michael@0:     }
michael@0: }
michael@0: 
michael@0: bool IsColorRenderable(GLenum internalformat)
michael@0: {
michael@0:     switch (internalformat)
michael@0:     {
michael@0:       case GL_RGBA4:
michael@0:       case GL_RGB5_A1:
michael@0:       case GL_RGB565:
michael@0:       case GL_RGB8_OES:
michael@0:       case GL_RGBA8_OES:
michael@0:         return true;
michael@0:       case GL_DEPTH_COMPONENT16:
michael@0:       case GL_STENCIL_INDEX8:
michael@0:       case GL_DEPTH24_STENCIL8_OES:
michael@0:         return false;
michael@0:       case GL_BGRA8_EXT:
michael@0:           return true;
michael@0:       default:
michael@0:         UNIMPLEMENTED();
michael@0:     }
michael@0: 
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: bool IsDepthRenderable(GLenum internalformat)
michael@0: {
michael@0:     switch (internalformat)
michael@0:     {
michael@0:       case GL_DEPTH_COMPONENT16:
michael@0:       case GL_DEPTH24_STENCIL8_OES:
michael@0:         return true;
michael@0:       case GL_STENCIL_INDEX8:
michael@0:       case GL_RGBA4:
michael@0:       case GL_RGB5_A1:
michael@0:       case GL_RGB565:
michael@0:       case GL_RGB8_OES:
michael@0:       case GL_RGBA8_OES:
michael@0:         return false;
michael@0:       default:
michael@0:         UNIMPLEMENTED();
michael@0:     }
michael@0: 
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: bool IsStencilRenderable(GLenum internalformat)
michael@0: {
michael@0:     switch (internalformat)
michael@0:     {
michael@0:       case GL_STENCIL_INDEX8:
michael@0:       case GL_DEPTH24_STENCIL8_OES:
michael@0:         return true;
michael@0:       case GL_RGBA4:
michael@0:       case GL_RGB5_A1:
michael@0:       case GL_RGB565:
michael@0:       case GL_RGB8_OES:
michael@0:       case GL_RGBA8_OES:
michael@0:       case GL_DEPTH_COMPONENT16:
michael@0:         return false;
michael@0:       default:
michael@0:         UNIMPLEMENTED();
michael@0:     }
michael@0: 
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: bool IsFloat32Format(GLint internalformat)
michael@0: {
michael@0:     switch (internalformat)
michael@0:     {
michael@0:       case GL_RGBA32F_EXT:
michael@0:       case GL_RGB32F_EXT:
michael@0:       case GL_ALPHA32F_EXT:
michael@0:       case GL_LUMINANCE32F_EXT:
michael@0:       case GL_LUMINANCE_ALPHA32F_EXT:
michael@0:         return true;
michael@0:       default:
michael@0:         return false;
michael@0:     }
michael@0: }
michael@0: 
michael@0: bool IsFloat16Format(GLint internalformat)
michael@0: {
michael@0:     switch (internalformat)
michael@0:     {
michael@0:       case GL_RGBA16F_EXT:
michael@0:       case GL_RGB16F_EXT:
michael@0:       case GL_ALPHA16F_EXT:
michael@0:       case GL_LUMINANCE16F_EXT:
michael@0:       case GL_LUMINANCE_ALPHA16F_EXT:
michael@0:         return true;
michael@0:       default:
michael@0:         return false;
michael@0:     }
michael@0: }
michael@0: 
michael@0: unsigned int GetAlphaSize(GLenum colorFormat)
michael@0: {
michael@0:     switch (colorFormat)
michael@0:     {
michael@0:       case GL_RGBA16F_EXT:
michael@0:         return 16;
michael@0:       case GL_RGBA32F_EXT:
michael@0:         return 32;
michael@0:       case GL_RGBA4:
michael@0:         return 4;
michael@0:       case GL_RGBA8_OES:
michael@0:       case GL_BGRA8_EXT:
michael@0:         return 8;
michael@0:       case GL_RGB5_A1:
michael@0:         return 1;
michael@0:       case GL_RGB8_OES:
michael@0:       case GL_RGB565:
michael@0:       case GL_RGB32F_EXT:
michael@0:       case GL_RGB16F_EXT:
michael@0:         return 0;
michael@0:       default:
michael@0:         return 0;
michael@0:     }
michael@0: }
michael@0: 
michael@0: unsigned int GetRedSize(GLenum colorFormat)
michael@0: {
michael@0:     switch (colorFormat)
michael@0:     {
michael@0:       case GL_RGBA16F_EXT:
michael@0:       case GL_RGB16F_EXT:
michael@0:         return 16;
michael@0:       case GL_RGBA32F_EXT:
michael@0:       case GL_RGB32F_EXT:
michael@0:         return 32;
michael@0:       case GL_RGBA4:
michael@0:         return 4;
michael@0:       case GL_RGBA8_OES:
michael@0:       case GL_BGRA8_EXT:
michael@0:       case GL_RGB8_OES:
michael@0:         return 8;
michael@0:       case GL_RGB5_A1:
michael@0:       case GL_RGB565:
michael@0:         return 5;
michael@0:       default:
michael@0:         return 0;
michael@0:     }
michael@0: }
michael@0: 
michael@0: unsigned int GetGreenSize(GLenum colorFormat)
michael@0: {
michael@0:     switch (colorFormat)
michael@0:     {
michael@0:       case GL_RGBA16F_EXT:
michael@0:       case GL_RGB16F_EXT:
michael@0:         return 16;
michael@0:       case GL_RGBA32F_EXT:
michael@0:       case GL_RGB32F_EXT:
michael@0:         return 32;
michael@0:       case GL_RGBA4:
michael@0:         return 4;
michael@0:       case GL_RGBA8_OES:
michael@0:       case GL_BGRA8_EXT:
michael@0:       case GL_RGB8_OES:
michael@0:         return 8;
michael@0:       case GL_RGB5_A1:
michael@0:         return 5;
michael@0:       case GL_RGB565:
michael@0:         return 6;
michael@0:       default:
michael@0:         return 0;
michael@0:     }
michael@0: }
michael@0: 
michael@0: unsigned int GetBlueSize(GLenum colorFormat)
michael@0: {
michael@0:     switch (colorFormat)
michael@0:     {
michael@0:       case GL_RGBA16F_EXT:
michael@0:       case GL_RGB16F_EXT:
michael@0:         return 16;
michael@0:       case GL_RGBA32F_EXT:
michael@0:       case GL_RGB32F_EXT:
michael@0:         return 32;
michael@0:       case GL_RGBA4:
michael@0:         return 4;
michael@0:       case GL_RGBA8_OES:
michael@0:       case GL_BGRA8_EXT:
michael@0:       case GL_RGB8_OES:
michael@0:         return 8;
michael@0:       case GL_RGB5_A1:
michael@0:       case GL_RGB565:
michael@0:         return 5;
michael@0:       default:
michael@0:         return 0;
michael@0:     }
michael@0: }
michael@0: 
michael@0: unsigned int GetDepthSize(GLenum depthFormat)
michael@0: {
michael@0:     switch (depthFormat)
michael@0:     {
michael@0:       case GL_DEPTH_COMPONENT16:        return 16;
michael@0:       case GL_DEPTH_COMPONENT32_OES:    return 32;
michael@0:       case GL_DEPTH24_STENCIL8_OES:     return 24;
michael@0:       default:                          return 0;
michael@0:     }
michael@0: }
michael@0: 
michael@0: unsigned int GetStencilSize(GLenum stencilFormat)
michael@0: {
michael@0:     switch (stencilFormat)
michael@0:     {
michael@0:       case GL_DEPTH24_STENCIL8_OES:     return 8;
michael@0:       default:                          return 0;
michael@0:     }
michael@0: }
michael@0: 
michael@0: bool IsTriangleMode(GLenum drawMode)
michael@0: {
michael@0:     switch (drawMode)
michael@0:     {
michael@0:       case GL_TRIANGLES:
michael@0:       case GL_TRIANGLE_FAN:
michael@0:       case GL_TRIANGLE_STRIP:
michael@0:         return true;
michael@0:       case GL_POINTS:
michael@0:       case GL_LINES:
michael@0:       case GL_LINE_LOOP:
michael@0:       case GL_LINE_STRIP:
michael@0:         return false;
michael@0:       default: UNREACHABLE();
michael@0:     }
michael@0: 
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: }
michael@0: 
michael@0: std::string getTempPath()
michael@0: {
michael@0:     char path[MAX_PATH];
michael@0:     DWORD pathLen = GetTempPathA(sizeof(path) / sizeof(path[0]), path);
michael@0:     if (pathLen == 0)
michael@0:     {
michael@0:         UNREACHABLE();
michael@0:         return std::string();
michael@0:     }
michael@0: 
michael@0:     UINT unique = GetTempFileNameA(path, "sh", 0, path);
michael@0:     if (unique == 0)
michael@0:     {
michael@0:         UNREACHABLE();
michael@0:         return std::string();
michael@0:     }
michael@0:     
michael@0:     return path;
michael@0: }
michael@0: 
michael@0: void writeFile(const char* path, const void* content, size_t size)
michael@0: {
michael@0:     FILE* file = fopen(path, "w");
michael@0:     if (!file)
michael@0:     {
michael@0:         UNREACHABLE();
michael@0:         return;
michael@0:     }
michael@0: 
michael@0:     fwrite(content, sizeof(char), size, file);
michael@0:     fclose(file);
michael@0: }