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From Johannes Baeuerele, "I have extended the pvr reader plugin to support etc1 compression(GL_ETC1_RGB8_OES). The changes attached to this submission are based on today's trunk.

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The pvr format which can be used as a wrapper for different compressed and uncompressed formats supports this compression algorithm. The original pvr compression uses the pvrtc format. The handling of pvrtc is already implemented in the pvr plugin. PVR provides wrapper functionality for some formats, e.g. etc or even dxt/dds.

Our target system (gles2) is able to use the etc compression format. With minor changes in the submitted files, there is no need to write a separate plugin. However the original pvr texture compression formats are not supported on our target, which is the reason for this extension.

The changes mainly consist in the definition on new enum values in the classes and headers of ReaderWriterPVR,Image and Texture. I also found some locations where the handling of the original pvr textures was not implemented. These are also part of this submission."
This commit is contained in:
Robert Osfield
2011-04-21 17:04:50 +00:00
parent 634344aef5
commit a793958836
4 changed files with 89 additions and 6 deletions
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52
src/osg/Texture.cpp
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@@ -138,6 +138,8 @@ void Texture::TextureProfile::computeSize()
case(GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG): numBitsPerTexel = 2; break;
case(GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG): numBitsPerTexel = 4; break;
case(GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG): numBitsPerTexel = 4; break;
case(GL_ETC1_RGB8_OES): numBitsPerTexel = 4; break;
}
_size = (unsigned int)(ceil(double(_width * _height * _depth * numBitsPerTexel)/8.0));
@@ -1358,7 +1360,40 @@ void Texture::computeInternalFormatWithImage(const osg::Image& image) const
}
else internalFormat = image.getInternalTextureFormat();
break;
case(USE_PVRTC_2BPP_COMPRESSION):
if (extensions->isTextureCompressionPVRTC2BPPSupported())
{
switch(image.getPixelFormat())
{
case(3):
case(GL_RGB): internalFormat = GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG; break;
case(4):
case(GL_RGBA): internalFormat = GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG; break;
default: internalFormat = image.getInternalTextureFormat(); break;
}
}
case(USE_PVRTC_4BPP_COMPRESSION):
if (extensions->isTextureCompressionPVRTC4BPPSupported())
{
switch(image.getPixelFormat())
{
case(3):
case(GL_RGB): internalFormat = GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG; break;
case(4):
case(GL_RGBA): internalFormat = GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG; break;
default: internalFormat = image.getInternalTextureFormat(); break;
}
}
case(USE_ETC_COMPRESSION):
if (extensions->isTextureCompressionETCSupported())
{
switch(image.getPixelFormat())
{
case(3):
case(GL_RGB): internalFormat = GL_ETC1_RGB8_OES; break;
default: internalFormat = image.getInternalTextureFormat(); break;
}
}
case(USE_RGTC1_COMPRESSION):
if (extensions->isTextureCompressionRGTCSupported())
{
@@ -1505,6 +1540,7 @@ bool Texture::isCompressedInternalFormat(GLint internalFormat)
case(GL_COMPRESSED_RED_RGTC1_EXT):
case(GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT):
case(GL_COMPRESSED_RED_GREEN_RGTC2_EXT):
case(GL_ETC1_RGB8_OES):
case(GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG):
case(GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG):
case(GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG):
@@ -1521,6 +1557,8 @@ void Texture::getCompressedSize(GLenum internalFormat, GLint width, GLint height
blockSize = 8;
else if (internalFormat == GL_COMPRESSED_RGBA_S3TC_DXT3_EXT || internalFormat == GL_COMPRESSED_RGBA_S3TC_DXT5_EXT)
blockSize = 16;
else if (internalFormat == GL_ETC1_RGB8_OES)
blockSize = 16;
else if (internalFormat == GL_COMPRESSED_RED_RGTC1_EXT || internalFormat == GL_COMPRESSED_SIGNED_RED_RGTC1_EXT)
blockSize = 8;
else if (internalFormat == GL_COMPRESSED_RED_GREEN_RGTC2_EXT || internalFormat == GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT)
@@ -1777,10 +1815,15 @@ void Texture::applyTexImage2D_load(State& state, GLenum target, const Image* ima
switch(_internalFormat)
{
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG:
case GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG:
case GL_ETC1_RGB8_OES:
case GL_COMPRESSED_RGB: _internalFormat = GL_RGB; break;
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
case GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG:
case GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG:
case GL_COMPRESSED_RGBA: _internalFormat = GL_RGBA; break;
case GL_COMPRESSED_ALPHA: _internalFormat = GL_ALPHA; break;
case GL_COMPRESSED_LUMINANCE: _internalFormat = GL_LUMINANCE; break;
@@ -2413,6 +2456,13 @@ Texture::Extensions::Extensions(unsigned int contextID)
_isTextureCompressionS3TCSupported = isGLExtensionSupported(contextID,"GL_EXT_texture_compression_s3tc");
_isTextureCompressionPVRTC2BPPSupported = isGLExtensionSupported(contextID,"GL_IMG_texture_compression_pvrtc");
_isTextureCompressionPVRTC4BPPSupported = _isTextureCompressionPVRTC2BPPSupported;//covered by same extension
_isTextureCompressionETCSupported = isGLExtensionSupported(contextID,"GL_OES_compressed_ETC1_RGB8_texture");
_isTextureCompressionRGTCSupported = isGLExtensionSupported(contextID,"GL_EXT_texture_compression_rgtc");
_isTextureCompressionPVRTCSupported = isGLExtensionSupported(contextID,"GL_IMG_texture_compression_pvrtc");