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Preliminary steps to support for compressed 3D textures.

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This commit is contained in:
Robert Osfield
2004-09-29 10:01:46 +00:00
parent f5e61a74fc
commit e08328a449
6 changed files with 120 additions and 30 deletions
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64
src/osg/Image.cpp
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@@ -20,6 +20,7 @@
#include <osg/Geometry>
#include <osg/StateSet>
#include <osg/Texture2D>
#include <osg/Texture3D>
#include "dxtctool.h"
@@ -404,20 +405,31 @@ void Image::readPixels(int x,int y,int width,int height,
void Image::readImageFromCurrentTexture(unsigned int contextID, bool copyMipMapsIfAvailable)
{
const osg::Texture::Extensions* extensions = osg::Texture::getExtensions(contextID,true);
const osg::Texture3D::Extensions* extensions3D = osg::Texture3D::getExtensions(contextID,true);
GLboolean binding1D, binding2D, binding3D;
glGetBooleanv(GL_TEXTURE_BINDING_1D, &binding1D);
glGetBooleanv(GL_TEXTURE_BINDING_2D, &binding2D);
glGetBooleanv(GL_TEXTURE_BINDING_3D, &binding3D);
GLenum textureMode = binding1D ? GL_TEXTURE_1D : binding2D ? GL_TEXTURE_2D : binding3D ? GL_TEXTURE_3D : 0;
if (textureMode==0) return;
GLint internalformat;
GLint width;
GLint height;
GLint depth;
GLint numMipMaps = 0;
if (copyMipMapsIfAvailable)
{
for(;numMipMaps<20;++numMipMaps)
{
glGetTexLevelParameteriv(GL_TEXTURE_2D, numMipMaps, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, numMipMaps, GL_TEXTURE_HEIGHT, &height);
glGetTexLevelParameteriv(GL_TEXTURE_2D, numMipMaps, GL_TEXTURE_DEPTH, &depth);
glGetTexLevelParameteriv(textureMode, numMipMaps, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(textureMode, numMipMaps, GL_TEXTURE_HEIGHT, &height);
glGetTexLevelParameteriv(textureMode, numMipMaps, GL_TEXTURE_DEPTH, &depth);
if (width==0 || height==0 || depth==0) break;
}
}
@@ -429,11 +441,23 @@ void Image::readImageFromCurrentTexture(unsigned int contextID, bool copyMipMaps
GLint compressed = 0;
if (extensions->isCompressedTexImage2DSupported())
if (textureMode==GL_TEXTURE_2D)
{
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_COMPRESSED_ARB,&compressed);
if (extensions->isCompressedTexImage2DSupported())
{
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_COMPRESSED_ARB,&compressed);
}
}
else if (textureMode==GL_TEXTURE_2D)
{
if (extensions3D->isCompressedTexImage3DSupported())
{
glGetTexLevelParameteriv(GL_TEXTURE_3D, 0, GL_TEXTURE_COMPRESSED_ARB,&compressed);
}
}
/* if the compression has been successful */
if (compressed == GL_TRUE)
{
@@ -447,7 +471,7 @@ void Image::readImageFromCurrentTexture(unsigned int contextID, bool copyMipMaps
if (i>0) mipMapData.push_back(total_size);
GLint compressed_size;
glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, &compressed_size);
glGetTexLevelParameteriv(textureMode, i, GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, &compressed_size);
total_size += compressed_size;
}
@@ -462,10 +486,10 @@ void Image::readImageFromCurrentTexture(unsigned int contextID, bool copyMipMaps
deallocateData(); // and sets it to NULL.
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &internalformat);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_DEPTH, &depth);
glGetTexLevelParameteriv(textureMode, 0, GL_TEXTURE_INTERNAL_FORMAT, &internalformat);
glGetTexLevelParameteriv(textureMode, 0, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(textureMode, 0, GL_TEXTURE_HEIGHT, &height);
glGetTexLevelParameteriv(textureMode, 0, GL_TEXTURE_DEPTH, &depth);
_data = data;
_s = width;
@@ -480,7 +504,7 @@ void Image::readImageFromCurrentTexture(unsigned int contextID, bool copyMipMaps
for(i=0;i<numMipMaps;++i)
{
extensions->glGetCompressedTexImage(GL_TEXTURE_2D, i, getMipmapData(i));
extensions->glGetCompressedTexImage(textureMode, i, getMipmapData(i));
}
++_modifiedTag;
@@ -496,9 +520,9 @@ void Image::readImageFromCurrentTexture(unsigned int contextID, bool copyMipMaps
{
if (i>0) mipMapData.push_back(total_size);
glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &height);
glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_DEPTH, &depth);
glGetTexLevelParameteriv(textureMode, i, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(textureMode, i, GL_TEXTURE_HEIGHT, &height);
glGetTexLevelParameteriv(textureMode, i, GL_TEXTURE_DEPTH, &depth);
unsigned int level_size = computeRowWidthInBytes(width,_pixelFormat,GL_UNSIGNED_BYTE,_packing)*height*depth;
@@ -515,10 +539,10 @@ void Image::readImageFromCurrentTexture(unsigned int contextID, bool copyMipMaps
deallocateData(); // and sets it to NULL.
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &internalformat);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_DEPTH, &depth);
glGetTexLevelParameteriv(textureMode, 0, GL_TEXTURE_INTERNAL_FORMAT, &internalformat);
glGetTexLevelParameteriv(textureMode, 0, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(textureMode, 0, GL_TEXTURE_HEIGHT, &height);
glGetTexLevelParameteriv(textureMode, 0, GL_TEXTURE_DEPTH, &depth);
_data = data;
_s = width;
@@ -533,7 +557,7 @@ void Image::readImageFromCurrentTexture(unsigned int contextID, bool copyMipMaps
for(i=0;i<numMipMaps;++i)
{
glGetTexImage(GL_TEXTURE_2D,i,_pixelFormat,_dataType,getMipmapData(i));
glGetTexImage(textureMode,i,_pixelFormat,_dataType,getMipmapData(i));
}
++_modifiedTag;