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|
/**************************************************************************
*
* Copyright 2014 VMware, Inc.
* All Rights Reserved.
*
* 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.
*
**************************************************************************/
#include "glstate_internal.hpp"
#include <assert.h>
#include <iostream>
#include <limits>
#include <type_traits>
#include "glsize.hpp"
#include "glstate.hpp"
namespace glstate {
/**
* Sames as enumToString, but with special provision to handle luminance/alpha
* formats.
*
* OpenGL 2.1 specification states that "internalFormat may (for backwards
* compatibility with the 1.0 version of the GL) also take on the integer
* values 1, 2, 3, and 4, which are equivalent to symbolic constants LUMINANCE,
* LUMINANCE ALPHA, RGB, and RGBA respectively".
*/
const char *
formatToString(GLenum internalFormat) {
switch (internalFormat) {
case 1:
return "GL_LUMINANCE";
case 2:
return "GL_LUMINANCE_ALPHA";
case 3:
return "GL_RGB";
case 4:
return "GL_RGBA";
default:
return enumToString(internalFormat);
}
}
static const InternalFormatDesc
internalFormatDescs[] = {
// GLenum internalFormat, GLenum format, GLenum type, GLenum readType
// Unsized UNORM
{ 1, GL_RED, GL_NONE, GL_UNSIGNED_BYTE },
{ 2, GL_RG, GL_NONE, GL_UNSIGNED_BYTE },
{ 3, GL_RGB, GL_NONE, GL_UNSIGNED_BYTE },
{ 4, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_RED, GL_RED, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_GREEN, GL_GREEN, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_BLUE, GL_BLUE, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_RG, GL_RG, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_RGB, GL_RGB, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_BGR, GL_BGR, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_RGBA, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_BGRA, GL_BGRA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE, GL_LUMINANCE, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_ALPHA, GL_ALPHA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE_ALPHA, GL_LUMINANCE_ALPHA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_INTENSITY, GL_INTENSITY, GL_NONE, GL_UNSIGNED_BYTE },
// Unsized SNORM
{ GL_RED_SNORM, GL_RED, GL_NONE, GL_FLOAT },
{ GL_RG_SNORM, GL_RG, GL_NONE, GL_FLOAT },
{ GL_RGB_SNORM, GL_RGB, GL_NONE, GL_FLOAT },
{ GL_RGBA_SNORM, GL_RGBA, GL_NONE, GL_FLOAT },
{ GL_LUMINANCE_SNORM, GL_LUMINANCE, GL_NONE, GL_FLOAT },
{ GL_ALPHA_SNORM, GL_ALPHA, GL_NONE, GL_FLOAT },
{ GL_LUMINANCE_ALPHA_SNORM, GL_LUMINANCE_ALPHA, GL_NONE, GL_FLOAT },
{ GL_INTENSITY_SNORM, GL_INTENSITY, GL_NONE, GL_FLOAT },
// 4-bit UNORM
{ GL_RGB4, GL_RGB, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_RGBA4, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE4, GL_LUMINANCE, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_ALPHA4, GL_ALPHA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE4_ALPHA4, GL_LUMINANCE_ALPHA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_INTENSITY4, GL_INTENSITY, GL_NONE, GL_UNSIGNED_BYTE },
// 8-bit UNORM
{ GL_R8, GL_RED, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_RG8, GL_RG, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_RGB8, GL_RGB, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_BGRA8_EXT, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE8, GL_LUMINANCE, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_ALPHA8, GL_ALPHA, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE8_ALPHA8, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_INTENSITY8, GL_INTENSITY, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
// 8-bit SNORM
{ GL_R8_SNORM, GL_RED, GL_BYTE, GL_FLOAT },
{ GL_RG8_SNORM, GL_RG, GL_BYTE, GL_FLOAT },
{ GL_RGB8_SNORM, GL_RGB, GL_BYTE, GL_FLOAT },
{ GL_RGBA8_SNORM, GL_RGBA, GL_BYTE, GL_FLOAT },
{ GL_LUMINANCE8_SNORM, GL_LUMINANCE, GL_BYTE, GL_FLOAT },
{ GL_ALPHA8_SNORM, GL_ALPHA, GL_BYTE, GL_FLOAT },
{ GL_LUMINANCE8_ALPHA8_SNORM, GL_LUMINANCE_ALPHA, GL_BYTE, GL_FLOAT },
{ GL_INTENSITY8_SNORM, GL_INTENSITY, GL_BYTE, GL_FLOAT },
// Other UNORM
{ GL_R3_G3_B2, GL_RGB, GL_UNSIGNED_BYTE_2_3_3_REV, GL_UNSIGNED_BYTE },
{ GL_RGB4, GL_RGB, GL_UNSIGNED_SHORT_4_4_4_4_REV, GL_UNSIGNED_BYTE },
{ GL_RGB5, GL_RGB, GL_UNSIGNED_SHORT_1_5_5_5_REV, GL_UNSIGNED_BYTE },
{ GL_RGB10, GL_RGB, GL_UNSIGNED_INT_2_10_10_10_REV, GL_UNSIGNED_BYTE },
{ GL_RGB12, GL_RGB, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_RGBA2, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_RGBA4, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4_REV, GL_UNSIGNED_BYTE },
{ GL_RGB5_A1, GL_RGBA, GL_UNSIGNED_SHORT_1_5_5_5_REV, GL_UNSIGNED_BYTE },
{ GL_RGB10_A2, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, GL_UNSIGNED_BYTE },
{ GL_RGBA12, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
// 16-bit UNORM
{ GL_R16, GL_RED, GL_UNSIGNED_SHORT, GL_FLOAT },
{ GL_RG16, GL_RG, GL_UNSIGNED_SHORT, GL_FLOAT },
{ GL_RGB16, GL_RGB, GL_UNSIGNED_SHORT, GL_FLOAT },
{ GL_RGBA16, GL_RGBA, GL_UNSIGNED_SHORT, GL_FLOAT },
{ GL_LUMINANCE16, GL_LUMINANCE, GL_UNSIGNED_SHORT, GL_FLOAT },
{ GL_ALPHA16, GL_ALPHA, GL_UNSIGNED_SHORT, GL_FLOAT },
{ GL_LUMINANCE16_ALPHA16, GL_LUMINANCE_ALPHA, GL_UNSIGNED_SHORT, GL_FLOAT },
{ GL_INTENSITY16, GL_INTENSITY, GL_UNSIGNED_SHORT, GL_FLOAT },
// 16-bit SNORM
{ GL_R16_SNORM, GL_RED, GL_SHORT, GL_FLOAT },
{ GL_RG16_SNORM, GL_RG, GL_SHORT, GL_FLOAT },
{ GL_RGB16_SNORM, GL_RGB, GL_SHORT, GL_FLOAT },
{ GL_RGBA16_SNORM, GL_RGBA, GL_SHORT, GL_FLOAT },
{ GL_LUMINANCE16_SNORM, GL_LUMINANCE, GL_SHORT, GL_FLOAT },
{ GL_ALPHA16_SNORM, GL_ALPHA, GL_SHORT, GL_FLOAT },
{ GL_LUMINANCE16_ALPHA16_SNORM, GL_LUMINANCE_ALPHA, GL_SHORT, GL_FLOAT },
{ GL_INTENSITY16_SNORM, GL_INTENSITY, GL_SHORT, GL_FLOAT },
// 16-bit float
{ GL_R16F, GL_RED, GL_HALF_FLOAT, GL_FLOAT },
{ GL_RG16F, GL_RG, GL_HALF_FLOAT, GL_FLOAT },
{ GL_RGB16F, GL_RGB, GL_HALF_FLOAT, GL_FLOAT },
{ GL_RGBA16F, GL_RGBA, GL_HALF_FLOAT, GL_FLOAT },
{ GL_LUMINANCE16F_ARB, GL_LUMINANCE, GL_HALF_FLOAT, GL_FLOAT },
{ GL_ALPHA16F_ARB, GL_ALPHA, GL_HALF_FLOAT, GL_FLOAT },
{ GL_LUMINANCE_ALPHA16F_ARB, GL_LUMINANCE_ALPHA, GL_HALF_FLOAT, GL_FLOAT },
{ GL_INTENSITY16F_ARB, GL_INTENSITY, GL_HALF_FLOAT, GL_FLOAT },
// 32-bit float
{ GL_R32F, GL_RED, GL_FLOAT, GL_FLOAT },
{ GL_RG32F, GL_RG, GL_FLOAT, GL_FLOAT },
{ GL_RGB32F, GL_RGB, GL_FLOAT, GL_FLOAT },
{ GL_RGBA32F, GL_RGBA, GL_FLOAT, GL_FLOAT },
{ GL_LUMINANCE32F_ARB, GL_LUMINANCE, GL_FLOAT, GL_FLOAT },
{ GL_ALPHA32F_ARB, GL_ALPHA, GL_FLOAT, GL_FLOAT },
{ GL_LUMINANCE_ALPHA32F_ARB, GL_LUMINANCE_ALPHA, GL_FLOAT, GL_FLOAT },
{ GL_INTENSITY32F_ARB, GL_INTENSITY, GL_FLOAT, GL_FLOAT },
// Other float
{ GL_R11F_G11F_B10F, GL_RGB, GL_UNSIGNED_INT_10F_11F_11F_REV, GL_FLOAT },
{ GL_RGB9_E5, GL_RGB, GL_UNSIGNED_INT_5_9_9_9_REV, GL_FLOAT },
// Unsized integer
// FIXME: currently we can only dump integers as GL_UNSIGNED_BYTE
{ GL_RED_INTEGER, GL_RED_INTEGER, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_GREEN_INTEGER, GL_GREEN_INTEGER, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_BLUE_INTEGER, GL_BLUE_INTEGER, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_ALPHA_INTEGER, GL_ALPHA_INTEGER, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_RG_INTEGER, GL_RG_INTEGER, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_RGB_INTEGER, GL_RGB_INTEGER, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_BGR_INTEGER, GL_BGR_INTEGER, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_RGBA_INTEGER, GL_RGBA_INTEGER, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_BGRA_INTEGER, GL_BGRA_INTEGER, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE_INTEGER_EXT, GL_LUMINANCE_INTEGER_EXT, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE_ALPHA_INTEGER_EXT, GL_LUMINANCE_ALPHA_INTEGER_EXT, GL_NONE, GL_UNSIGNED_BYTE },
// 8-bit unsigned integer
{ GL_R8UI, GL_RED_INTEGER, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_RG8UI, GL_RG_INTEGER, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_RGB8UI, GL_RGB_INTEGER, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_RGBA8UI, GL_RGBA_INTEGER, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE8UI_EXT, GL_LUMINANCE_INTEGER_EXT, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_ALPHA8UI_EXT, GL_ALPHA_INTEGER_EXT, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE_ALPHA8UI_EXT, GL_LUMINANCE_ALPHA_INTEGER_EXT, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_INTENSITY8UI_EXT, GL_RED_INTEGER, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
// 8-bit signed integer
{ GL_R8I, GL_RED_INTEGER, GL_BYTE, GL_UNSIGNED_BYTE },
{ GL_RG8I, GL_RG_INTEGER, GL_BYTE, GL_UNSIGNED_BYTE },
{ GL_RGB8I, GL_RGB_INTEGER, GL_BYTE, GL_UNSIGNED_BYTE },
{ GL_RGBA8I, GL_RGBA_INTEGER, GL_BYTE, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE8I_EXT, GL_LUMINANCE_INTEGER_EXT, GL_BYTE, GL_UNSIGNED_BYTE },
{ GL_ALPHA8I_EXT, GL_ALPHA_INTEGER_EXT, GL_BYTE, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE_ALPHA8I_EXT, GL_LUMINANCE_ALPHA_INTEGER_EXT, GL_BYTE, GL_UNSIGNED_BYTE },
{ GL_INTENSITY8I_EXT, GL_RED_INTEGER, GL_BYTE, GL_UNSIGNED_BYTE },
// 10-bit unsigned integer
{ GL_RGB10_A2UI, GL_RGBA_INTEGER, GL_UNSIGNED_INT_2_10_10_10_REV, GL_UNSIGNED_BYTE },
// 16-bit unsigned integer
{ GL_R16UI, GL_RED_INTEGER, GL_UNSIGNED_SHORT, GL_UNSIGNED_BYTE },
{ GL_RG16UI, GL_RG_INTEGER, GL_UNSIGNED_SHORT, GL_UNSIGNED_BYTE },
{ GL_RGB16UI, GL_RGB_INTEGER, GL_UNSIGNED_SHORT, GL_UNSIGNED_BYTE },
{ GL_RGBA16UI, GL_RGBA_INTEGER, GL_UNSIGNED_SHORT, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE16UI_EXT, GL_LUMINANCE_INTEGER_EXT, GL_UNSIGNED_SHORT, GL_UNSIGNED_BYTE },
{ GL_ALPHA16UI_EXT, GL_ALPHA_INTEGER_EXT, GL_UNSIGNED_SHORT, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE_ALPHA16UI_EXT, GL_LUMINANCE_ALPHA_INTEGER_EXT, GL_UNSIGNED_SHORT, GL_UNSIGNED_BYTE },
{ GL_INTENSITY16UI_EXT, GL_RED_INTEGER, GL_UNSIGNED_SHORT, GL_UNSIGNED_BYTE },
// 16-bit signed integer
{ GL_R16I, GL_RED_INTEGER, GL_SHORT, GL_UNSIGNED_BYTE },
{ GL_RG16I, GL_RG_INTEGER, GL_SHORT, GL_UNSIGNED_BYTE },
{ GL_RGB16I, GL_RGB_INTEGER, GL_SHORT, GL_UNSIGNED_BYTE },
{ GL_RGBA16I, GL_RGBA_INTEGER, GL_SHORT, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE16I_EXT, GL_LUMINANCE_INTEGER_EXT, GL_SHORT, GL_UNSIGNED_BYTE },
{ GL_ALPHA16I_EXT, GL_ALPHA_INTEGER_EXT, GL_SHORT, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE_ALPHA16I_EXT, GL_LUMINANCE_ALPHA_INTEGER_EXT, GL_SHORT, GL_UNSIGNED_BYTE },
{ GL_INTENSITY16I_EXT, GL_RED_INTEGER, GL_SHORT, GL_UNSIGNED_BYTE },
// 32-bit unsigned integer
{ GL_R32UI, GL_RED_INTEGER, GL_UNSIGNED_INT, GL_UNSIGNED_BYTE },
{ GL_RG32UI, GL_RG_INTEGER, GL_UNSIGNED_INT, GL_UNSIGNED_BYTE },
{ GL_RGB32UI, GL_RGB_INTEGER, GL_UNSIGNED_INT, GL_UNSIGNED_BYTE },
{ GL_RGBA32UI, GL_RGBA_INTEGER, GL_UNSIGNED_INT, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE32UI_EXT, GL_LUMINANCE_INTEGER_EXT, GL_UNSIGNED_INT, GL_UNSIGNED_BYTE },
{ GL_ALPHA32UI_EXT, GL_ALPHA_INTEGER_EXT, GL_UNSIGNED_INT, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE_ALPHA32UI_EXT, GL_LUMINANCE_ALPHA_INTEGER_EXT, GL_UNSIGNED_INT, GL_UNSIGNED_BYTE },
{ GL_INTENSITY32UI_EXT, GL_RED_INTEGER, GL_UNSIGNED_INT, GL_UNSIGNED_BYTE },
// 32-bit signed integer
{ GL_R32I, GL_RED_INTEGER, GL_INT, GL_UNSIGNED_BYTE },
{ GL_RG32I, GL_RG_INTEGER, GL_INT, GL_UNSIGNED_BYTE },
{ GL_RGB32I, GL_RGB_INTEGER, GL_INT, GL_UNSIGNED_BYTE },
{ GL_RGBA32I, GL_RGBA_INTEGER, GL_INT, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE32I_EXT, GL_LUMINANCE_INTEGER_EXT, GL_INT, GL_UNSIGNED_BYTE },
{ GL_ALPHA32I_EXT, GL_ALPHA_INTEGER_EXT, GL_INT, GL_UNSIGNED_BYTE },
{ GL_LUMINANCE_ALPHA32I_EXT, GL_LUMINANCE_ALPHA_INTEGER_EXT, GL_INT, GL_UNSIGNED_BYTE },
{ GL_INTENSITY32I_EXT, GL_RED_INTEGER, GL_INT, GL_UNSIGNED_BYTE },
// Compressed
{ GL_COMPRESSED_RED, GL_RED, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_RED_RGTC1, GL_RED, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_R11_EAC, GL_RED, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_RG, GL_RG, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_RG_RGTC2, GL_RG, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_RG11_EAC, GL_RG, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_RGB, GL_RGB, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_RGB_S3TC_DXT1_EXT, GL_RGB, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_RGB8_ETC2, GL_RGB, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_RGBA, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_RGBA_S3TC_DXT3_EXT, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_RGBA8_ETC2_EAC, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_LUMINANCE, GL_LUMINANCE, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_LUMINANCE_ALPHA, GL_LUMINANCE_ALPHA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_LUMINANCE_LATC1_EXT, GL_LUMINANCE, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT, GL_LUMINANCE_ALPHA, GL_NONE, GL_UNSIGNED_BYTE },
// Compressed signed
{ GL_COMPRESSED_SIGNED_RED_RGTC1, GL_RED, GL_NONE, GL_FLOAT },
{ GL_COMPRESSED_SIGNED_R11_EAC, GL_RED, GL_NONE, GL_FLOAT },
{ GL_COMPRESSED_SIGNED_RG_RGTC2, GL_RG, GL_NONE, GL_FLOAT },
{ GL_COMPRESSED_SIGNED_RG11_EAC, GL_RG, GL_NONE, GL_FLOAT },
{ GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT, GL_LUMINANCE, GL_NONE, GL_FLOAT },
{ GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT, GL_LUMINANCE_ALPHA, GL_NONE, GL_FLOAT },
// SRGB
{ GL_SRGB, GL_RGB, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_SRGB8, GL_RGB, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_SRGB_ALPHA, GL_RGBA, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_SRGB8_ALPHA8, GL_RGBA, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_SLUMINANCE_ALPHA, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_SLUMINANCE8_ALPHA8, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_SLUMINANCE, GL_LUMINANCE, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_SLUMINANCE8, GL_LUMINANCE, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_SRGB, GL_RGB, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_SRGB_ALPHA, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_SLUMINANCE, GL_LUMINANCE, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_SLUMINANCE_ALPHA, GL_LUMINANCE_ALPHA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_SRGB_S3TC_DXT1_EXT, GL_RGB, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT, GL_RGBA, GL_NONE, GL_UNSIGNED_BYTE },
// depth-stencil
{ GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, GL_NONE, GL_FLOAT },
{ GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT, GL_FLOAT },
{ GL_DEPTH_COMPONENT24, GL_DEPTH_COMPONENT, GL_NONE, GL_FLOAT },
{ GL_DEPTH_COMPONENT32, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, GL_FLOAT },
{ GL_DEPTH_COMPONENT32F, GL_DEPTH_COMPONENT, GL_FLOAT, GL_FLOAT },
{ GL_DEPTH_COMPONENT32F_NV, GL_DEPTH_COMPONENT, GL_FLOAT, GL_FLOAT },
{ GL_DEPTH_STENCIL, GL_DEPTH_STENCIL, GL_NONE, GL_FLOAT },
{ GL_DEPTH24_STENCIL8, GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8_EXT, GL_FLOAT },
{ GL_DEPTH32F_STENCIL8, GL_DEPTH_STENCIL, GL_FLOAT_32_UNSIGNED_INT_24_8_REV, GL_FLOAT },
{ GL_DEPTH32F_STENCIL8_NV, GL_DEPTH_STENCIL, GL_FLOAT_32_UNSIGNED_INT_24_8_REV, GL_FLOAT },
{ GL_STENCIL_INDEX, GL_STENCIL_INDEX, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_STENCIL_INDEX1, GL_STENCIL_INDEX, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_STENCIL_INDEX4, GL_STENCIL_INDEX, GL_NONE, GL_UNSIGNED_BYTE },
{ GL_STENCIL_INDEX8, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE },
{ GL_STENCIL_INDEX16, GL_STENCIL_INDEX, GL_UNSIGNED_SHORT, GL_UNSIGNED_BYTE },
};
static const InternalFormatDesc
defaultInternalFormatDesc = {
GL_RGBA, GL_RGBA, GL_NONE, GL_FLOAT
};
const InternalFormatDesc &
getInternalFormatDesc(GLenum internalFormat)
{
for (unsigned i = 0; i < sizeof internalFormatDescs / sizeof internalFormatDescs[0]; ++i) {
if (internalFormatDescs[i].internalFormat == internalFormat) {
return internalFormatDescs[i];
}
}
std::cerr << "warning: unexpected internalFormat " << enumToString(internalFormat) << "\n";
return defaultInternalFormatDesc;
}
/**
* Choose appropriate format/type for glReadPixels()/glGetTexImage()
*/
void
chooseReadBackFormat(const InternalFormatDesc &formatDesc, GLenum &format, GLenum &type)
{
/* TODO: leverage glGetInternalformat where available */
type = formatDesc.readType;
assert(type == GL_UNSIGNED_BYTE || type == GL_FLOAT);
switch (formatDesc.format) {
case GL_RED:
case GL_GREEN:
case GL_BLUE:
case GL_RG:
case GL_RGB:
case GL_BGR:
format = GL_RGB;
break;
case GL_ALPHA:
case GL_RGBA:
case GL_BGRA:
case GL_INTENSITY:
format = GL_RGBA;
break;
case GL_LUMINANCE:
format = GL_LUMINANCE;
break;
case GL_LUMINANCE_ALPHA:
format = GL_LUMINANCE_ALPHA;
break;
case GL_RED_INTEGER:
case GL_GREEN_INTEGER:
case GL_BLUE_INTEGER:
case GL_RG_INTEGER:
case GL_RGB_INTEGER:
case GL_BGR_INTEGER:
case GL_ALPHA_INTEGER:
case GL_RGBA_INTEGER:
case GL_BGRA_INTEGER:
format = GL_RGBA_INTEGER;
break;
case GL_LUMINANCE_INTEGER_EXT:
format = GL_LUMINANCE_INTEGER_EXT;
break;
case GL_LUMINANCE_ALPHA_INTEGER_EXT:
format = GL_LUMINANCE_ALPHA_INTEGER_EXT;
break;
case GL_DEPTH_COMPONENT:
case GL_DEPTH_STENCIL:
/* TODO: allow pick stencil component too*/
format = GL_DEPTH_COMPONENT;
type = GL_FLOAT;
break;
case GL_STENCIL_INDEX:
format = GL_STENCIL_INDEX;
type = GL_UNSIGNED_BYTE;
break;
default:
assert(0);
format = GL_RGBA;
type = GL_FLOAT;
break;
}
}
void
getImageFormat(GLenum format, GLenum type,
GLuint & channels, image::ChannelType & channelType)
{
channels = _gl_format_channels(format);
switch (type) {
case GL_UNSIGNED_BYTE:
channelType = image::TYPE_UNORM8;
break;
case GL_FLOAT:
channelType = image::TYPE_FLOAT;
break;
default:
assert(0);
}
}
// Macros for describing arbitrary swizzles
#define SWIZZLE_X 0
#define SWIZZLE_Y 1
#define SWIZZLE_Z 2
#define SWIZZLE_W 3
#define SWIZZLE_0 4
#define SWIZZLE_1 5
#define SWIZZLE_COUNT 6
#define SWIZZLE_BITS 4
#define SWIZZLE_MASK ((1 << SWIZZLE_BITS) - 1)
#define SWIZZLE(x, y, z, w) \
(((SWIZZLE_##x) << (SWIZZLE_BITS*0)) | \
((SWIZZLE_##y) << (SWIZZLE_BITS*1)) | \
((SWIZZLE_##z) << (SWIZZLE_BITS*2)) | \
((SWIZZLE_##w) << (SWIZZLE_BITS*3)))
#define SWIZZLE_RGBA SWIZZLE(X,Y,Z,W)
#define SWIZZLE_RGB SWIZZLE(X,Y,Z,1)
#define SWIZZLE_RG SWIZZLE(X,Y,0,1)
#define SWIZZLE_R SWIZZLE(X,0,0,1)
#define SWIZZLE_LA SWIZZLE(X,X,X,Y)
#define SWIZZLE_L SWIZZLE(X,X,X,1)
#define SWIZZLE_A SWIZZLE(0,0,0,X)
#define SWIZZLE_I SWIZZLE(X,X,X,X)
#define SWIZZLE_EXTRACT(swizzle, channel) \
((swizzle) >> (SWIZZLE_BITS * (channel)) & SWIZZLE_MASK)
// Template that can describe all regular array-based pixel formats
template< typename Type, unsigned components, bool normalized, uint16_t swizzle >
class PixelTemplate : public PixelFormat
{
protected:
static_assert( 1 <= components && components <= 4, "invalid number of components" );
static const unsigned swizzle_r = SWIZZLE_EXTRACT(swizzle, 0);
static const unsigned swizzle_g = SWIZZLE_EXTRACT(swizzle, 1);
static const unsigned swizzle_b = SWIZZLE_EXTRACT(swizzle, 2);
static const unsigned swizzle_a = SWIZZLE_EXTRACT(swizzle, 3);
static_assert( swizzle_r < components || swizzle_r == SWIZZLE_0 || swizzle_r == SWIZZLE_1, "invalid R swizzle" );
static_assert( swizzle_g < components || swizzle_g == SWIZZLE_0 || swizzle_g == SWIZZLE_1, "invalid G swizzle" );
static_assert( swizzle_b < components || swizzle_b == SWIZZLE_0 || swizzle_b == SWIZZLE_1, "invalid B swizzle" );
static_assert( swizzle_a < components || swizzle_a == SWIZZLE_0 || swizzle_a == SWIZZLE_1, "invalid A swizzle" );
// We must use double precision intermediate values when normalizing 32bits integers.
typedef typename std::conditional< normalized && sizeof(Type) >= 4 , double , float >::type Scale;
// Scale normalized types
template<typename T = void>
static inline Scale
scale(Scale value, typename std::enable_if<normalized, T>::type* = 0)
{
static_assert( normalized, "should only be instantiated for normalized types" );
#ifndef _MSC_VER
static constexpr Type typeMax = std::numeric_limits<Type>::max();
static_assert( static_cast<Type>(static_cast<Scale>(typeMax)) == typeMax,
"intermediate type cannot represent maximum value without loss of precission" );
static constexpr Scale scaleFactor = Scale(1) / Scale(typeMax);
static_assert( Scale(typeMax) * scaleFactor == Scale(1), "cannot represent unity" );
static_assert( Scale(0) * scaleFactor == Scale(0), "cannot represent zero" );
#else
// XXX: MSCV doesn't support constexpr yet
static const Type typeMax = std::numeric_limits<Type>::max();
assert( static_cast<Type>(static_cast<Scale>(typeMax)) == typeMax );
static const Scale scaleFactor = Scale(1) / Scale(typeMax);
assert( Scale(typeMax) * scaleFactor == Scale(1) );
assert( Scale(0) * scaleFactor == Scale(0) );
#endif
return value * scaleFactor;
}
// No-op for unormalized types
template<typename T = void>
static inline Scale
scale(Scale value, typename std::enable_if<!normalized, T>::type* = 0)
{
static_assert( !normalized, "should only be instantiated for non-normalized types" );
return value;
}
// Unpack a single pixel
static inline void
unpackPixel(const Type *inPixel, float outPixel[4])
{
float scaledComponents[SWIZZLE_COUNT];
for (unsigned component = 0; component < components; ++component) {
Scale scaledComponent = scale(static_cast<Scale>(inPixel[component]));
scaledComponents[component] = static_cast<float>(scaledComponent);
}
scaledComponents[SWIZZLE_0] = 0.0f;
scaledComponents[SWIZZLE_1] = 1.0f;
outPixel[0] = scaledComponents[swizzle_r];
outPixel[1] = scaledComponents[swizzle_g];
outPixel[2] = scaledComponents[swizzle_b];
outPixel[3] = scaledComponents[swizzle_a];
}
public:
inline
PixelTemplate(void) {
}
size_t
size(void) const {
return sizeof(Type) * components;
}
void
unpackSpan(const uint8_t *inSpan, float *outSpan, unsigned width) const
{
const Type *inPixel = reinterpret_cast<const Type *>(inSpan);
for (unsigned x = 0; x < width; ++x) {
unpackPixel(inPixel, outSpan);
inPixel += components;
outSpan += 4;
}
}
};
const PixelFormat *
getPixelFormat(GLenum internalFormat)
{
static const bool Y = true;
static const bool N = false;
#define CASE(internalFormat, type, components, norm, swizzle) \
case GL_##internalFormat: \
{ \
static const PixelTemplate< GL##type, components, norm, SWIZZLE_##swizzle > pixel; \
return &pixel; \
}
switch (internalFormat) {
CASE(ALPHA8, ubyte, 1, Y, A);
CASE(ALPHA16, ushort, 1, Y, A);
CASE(ALPHA16F_ARB, half, 1, N, A);
CASE(ALPHA32F_ARB, float, 1, N, A);
CASE(ALPHA8I_EXT, byte, 1, N, A);
CASE(ALPHA16I_EXT, short, 1, N, A);
CASE(ALPHA32I_EXT, int, 1, N, A);
CASE(ALPHA8UI_EXT, ubyte, 1, N, A);
CASE(ALPHA16UI_EXT, ushort, 1, N, A);
CASE(ALPHA32UI_EXT, uint, 1, N, A);
CASE(LUMINANCE8, ubyte, 1, Y, L);
CASE(LUMINANCE16, ushort, 1, Y, L);
CASE(LUMINANCE16F_ARB, half, 1, N, L);
CASE(LUMINANCE32F_ARB, float, 1, N, L);
CASE(LUMINANCE8I_EXT, byte, 1, N, L);
CASE(LUMINANCE16I_EXT, short, 1, N, L);
CASE(LUMINANCE32I_EXT, int, 1, N, L);
CASE(LUMINANCE8UI_EXT, ubyte, 1, N, L);
CASE(LUMINANCE16UI_EXT, ushort, 1, N, L);
CASE(LUMINANCE32UI_EXT, uint, 1, N, L);
CASE(LUMINANCE8_ALPHA8, ubyte, 2, Y, LA);
CASE(LUMINANCE16_ALPHA16, ushort, 2, Y, LA);
CASE(LUMINANCE_ALPHA16F_ARB, half, 2, N, LA);
CASE(LUMINANCE_ALPHA32F_ARB, float, 2, N, LA);
CASE(LUMINANCE_ALPHA8I_EXT, byte, 2, N, LA);
CASE(LUMINANCE_ALPHA16I_EXT, short, 2, N, LA);
CASE(LUMINANCE_ALPHA32I_EXT, int, 2, N, LA);
CASE(LUMINANCE_ALPHA8UI_EXT, ubyte, 2, N, LA);
CASE(LUMINANCE_ALPHA16UI_EXT, ushort, 2, N, LA);
CASE(LUMINANCE_ALPHA32UI_EXT, uint, 2, N, LA);
CASE(INTENSITY8, ubyte, 1, Y, I);
CASE(INTENSITY16, ushort, 1, Y, I);
CASE(INTENSITY16F_ARB, half, 1, N, I);
CASE(INTENSITY32F_ARB, float, 1, N, I);
CASE(INTENSITY8I_EXT, byte, 1, N, I);
CASE(INTENSITY16I_EXT, short, 1, N, I);
CASE(INTENSITY32I_EXT, int, 1, N, I);
CASE(INTENSITY8UI_EXT, ubyte, 1, N, I);
CASE(INTENSITY16UI_EXT, ushort, 1, N, I);
CASE(INTENSITY32UI_EXT, uint, 1, N, I);
CASE(RGBA8, ubyte, 4, Y, RGBA);
CASE(RGBA16, ushort, 4, Y, RGBA);
CASE(RGBA16F, half, 4, N, RGBA);
CASE(RGBA32F, float, 4, N, RGBA);
CASE(RGBA8I, byte, 4, N, RGBA);
CASE(RGBA16I, short, 4, N, RGBA);
CASE(RGBA32I, int, 4, N, RGBA);
CASE(RGBA8UI, ubyte, 4, N, RGBA);
CASE(RGBA16UI, ushort, 4, N, RGBA);
CASE(RGBA32UI, uint, 4, N, RGBA);
CASE(RGB8, ubyte, 3, Y, RGB);
CASE(RGB16, ushort, 3, Y, RGB);
CASE(RGB16F, half, 3, N, RGB);
CASE(RGB32F, float, 3, N, RGB);
CASE(RGB8I, byte, 3, N, RGB);
CASE(RGB16I, short, 3, N, RGB);
CASE(RGB32I, int, 3, N, RGB);
CASE(RGB8UI, ubyte, 3, N, RGB);
CASE(RGB16UI, ushort, 3, N, RGB);
CASE(RGB32UI, uint, 3, N, RGB);
CASE(RG8, ubyte, 2, Y, RG);
CASE(RG16, ushort, 2, Y, RG);
CASE(RG16F, half, 2, N, RG);
CASE(RG32F, float, 2, N, RG);
CASE(RG8I, byte, 2, N, RG);
CASE(RG16I, short, 2, N, RG);
CASE(RG32I, int, 2, N, RG);
CASE(RG8UI, ubyte, 2, N, RG);
CASE(RG16UI, ushort, 2, N, RG);
CASE(RG32UI, uint, 2, N, RG);
CASE(R8, ubyte, 1, Y, R);
CASE(R16, ushort, 1, Y, R);
CASE(R16F, half, 1, N, R);
CASE(R32F, float, 1, N, R);
CASE(R8I, byte, 1, N, R);
CASE(R16I, short, 1, N, R);
CASE(R32I, int, 1, N, R);
CASE(R8UI, ubyte, 1, N, R);
CASE(R16UI, ushort, 1, N, R);
CASE(R32UI, uint, 1, N, R);
default:
return nullptr;
}
#undef CASE
}
} /* namespace glstate */
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