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Generalize unsized pixel format computation

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This commit is contained in:
Alexei Kotov 2024-04-16 02:52:25 +03:00
parent 3c0c1717a9
commit 443e341ae7
4 changed files with 132 additions and 12 deletions
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117
components/sceneutil/util.cpp
View file

@ -286,18 +286,125 @@ namespace SceneUtil
mOperationQueue->add(operation);
}
bool isRedGreenPixelFormat(GLenum format)
GLenum computeUnsizedPixelFormat(GLenum format)
{
switch (format)
{
case GL_RG:
case GL_RG_INTEGER:
// Try compressed formats first, they're more likely to be used
// Generic
case GL_COMPRESSED_ALPHA_ARB:
return GL_ALPHA;
case GL_COMPRESSED_INTENSITY_ARB:
return GL_INTENSITY;
case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
return GL_LUMINANCE_ALPHA;
case GL_COMPRESSED_LUMINANCE_ARB:
return GL_LUMINANCE;
case GL_COMPRESSED_RGB_ARB:
return GL_RGB;
case GL_COMPRESSED_RGBA_ARB:
return GL_RGBA;
// S3TC
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
return GL_RGB;
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
return GL_RGBA;
// RGTC
case GL_COMPRESSED_RED_RGTC1_EXT:
case GL_COMPRESSED_SIGNED_RED_RGTC1_EXT:
return GL_RED;
case GL_COMPRESSED_RED_GREEN_RGTC2_EXT:
case GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT:
return true;
return GL_RG;
// PVRTC
case GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG:
case GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG:
return GL_RGB;
case GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG:
case GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG:
return GL_RGBA;
// ETC
case GL_COMPRESSED_R11_EAC:
case GL_COMPRESSED_SIGNED_R11_EAC:
return GL_RED;
case GL_COMPRESSED_RG11_EAC:
case GL_COMPRESSED_SIGNED_RG11_EAC:
return GL_RG;
case GL_ETC1_RGB8_OES:
case GL_COMPRESSED_RGB8_ETC2:
case GL_COMPRESSED_SRGB8_ETC2:
return GL_RGB;
case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2:
case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2:
case GL_COMPRESSED_RGBA8_ETC2_EAC:
case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC:
return GL_RGBA;
// ASTC
case GL_COMPRESSED_RGBA_ASTC_4x4_KHR:
case GL_COMPRESSED_RGBA_ASTC_5x4_KHR:
case GL_COMPRESSED_RGBA_ASTC_5x5_KHR:
case GL_COMPRESSED_RGBA_ASTC_6x5_KHR:
case GL_COMPRESSED_RGBA_ASTC_6x6_KHR:
case GL_COMPRESSED_RGBA_ASTC_8x5_KHR:
case GL_COMPRESSED_RGBA_ASTC_8x6_KHR:
case GL_COMPRESSED_RGBA_ASTC_8x8_KHR:
case GL_COMPRESSED_RGBA_ASTC_10x5_KHR:
case GL_COMPRESSED_RGBA_ASTC_10x6_KHR:
case GL_COMPRESSED_RGBA_ASTC_10x8_KHR:
case GL_COMPRESSED_RGBA_ASTC_10x10_KHR:
case GL_COMPRESSED_RGBA_ASTC_12x10_KHR:
case GL_COMPRESSED_RGBA_ASTC_12x12_KHR:
case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR:
case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR:
case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR:
case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR:
case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR:
case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR:
case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR:
case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR:
case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR:
case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR:
case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR:
case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR:
case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR:
case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR:
return GL_RGBA;
// Plug in some holes computePixelFormat has, you never know when these could come in handy
case GL_INTENSITY4:
case GL_INTENSITY8:
case GL_INTENSITY12:
case GL_INTENSITY16:
return GL_INTENSITY;
case GL_LUMINANCE4:
case GL_LUMINANCE8:
case GL_LUMINANCE12:
case GL_LUMINANCE16:
return GL_LUMINANCE;
case GL_LUMINANCE4_ALPHA4:
case GL_LUMINANCE6_ALPHA2:
case GL_LUMINANCE8_ALPHA8:
case GL_LUMINANCE12_ALPHA4:
case GL_LUMINANCE12_ALPHA12:
case GL_LUMINANCE16_ALPHA16:
return GL_LUMINANCE_ALPHA;
}
return false;
return osg::Image::computePixelFormat(format);
}
}

4
components/sceneutil/util.hpp
View file

@ -113,7 +113,9 @@ namespace SceneUtil
osg::ref_ptr<osg::OperationQueue> mOperationQueue;
};
bool isRedGreenPixelFormat(GLenum format);
// Compute the unsized format equivalent to the given pixel format
// Unlike osg::Image::computePixelFormat, this also covers compressed formats
GLenum computeUnsizedPixelFormat(GLenum format);
}
#endif

10
components/shader/shadervisitor.cpp
View file

@ -447,10 +447,14 @@ namespace Shader
if (normalMap != nullptr && normalMap->getImage(0))
{
// Special handling for red-green normal maps (e.g. BC5 or R8G8)
if (SceneUtil::isRedGreenPixelFormat(normalMap->getImage(0)->getPixelFormat()))
switch (SceneUtil::computeUnsizedPixelFormat(normalMap->getImage(0)->getPixelFormat()))
{
mRequirements.back().mReconstructNormalZ = true;
mRequirements.back().mNormalHeight = false;
case GL_RG:
case GL_RG_INTEGER:
{
mRequirements.back().mReconstructNormalZ = true;
mRequirements.back().mNormalHeight = false;
}
}
}

13
components/terrain/material.cpp
View file

@ -282,10 +282,17 @@ namespace Terrain
// Special handling for red-green normal maps (e.g. BC5 or R8G8).
const osg::Image* image = it->mNormalMap->getImage(0);
if (image && SceneUtil::isRedGreenPixelFormat(image->getPixelFormat()))
if (image)
{
reconstructNormalZ = true;
parallax = false;
switch (SceneUtil::computeUnsizedPixelFormat(image->getPixelFormat()))
{
case GL_RG:
case GL_RG_INTEGER:
{
reconstructNormalZ = true;
parallax = false;
}
}
}
}