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Integrated submission from Boris Bralo:

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Supported added for precompiled mip maps stored in osg::Image, and read
by osg::Texture.

Updates to TerraPage loader for support of compressed texture images and
precompiled mip maps.
This commit is contained in:
Robert Osfield
2002-04-22 21:13:33 +00:00
parent 8b30a10375
commit dcfef4a023
4 changed files with 168 additions and 29 deletions
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106
src/osg/Texture.cpp
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@@ -11,6 +11,10 @@
#include <osg/GLU>
#ifndef PFNGLCOMPRESSEDTEXIMAGE2DARBPROC
typedef void (APIENTRY * PFNGLCOMPRESSEDTEXIMAGE2DARBPROC) (GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLsizei imageSize, const GLvoid *data);
#endif
using namespace osg;
@@ -339,6 +343,7 @@ void Texture::applyTexImage(GLenum target, Image* image, State& state) const
static bool s_S3TC_Compression = isGLExtensionSupported("GL_EXT_texture_compression_s3tc");
// select the internalFormat required for the texture.
bool compressed = false;
GLint internalFormat = image->getInternalTextureFormat();
switch(_internalFormatMode)
{
@@ -349,6 +354,7 @@ void Texture::applyTexImage(GLenum target, Image* image, State& state) const
case(USE_ARB_COMPRESSION):
if (s_ARB_Compression)
{
compressed = true;
switch(image->getPixelFormat())
{
case(1): internalFormat = GL_COMPRESSED_ALPHA_ARB; break;
@@ -369,6 +375,7 @@ void Texture::applyTexImage(GLenum target, Image* image, State& state) const
case(USE_S3TC_DXT1_COMPRESSION):
if (s_S3TC_Compression)
{
compressed = true;
switch(image->getPixelFormat())
{
case(3): internalFormat = GL_COMPRESSED_RGB_S3TC_DXT1_EXT; break;
@@ -384,6 +391,7 @@ void Texture::applyTexImage(GLenum target, Image* image, State& state) const
case(USE_S3TC_DXT3_COMPRESSION):
if (s_S3TC_Compression)
{
compressed = true;
switch(image->getPixelFormat())
{
case(3):
@@ -399,6 +407,7 @@ void Texture::applyTexImage(GLenum target, Image* image, State& state) const
case(USE_S3TC_DXT5_COMPRESSION):
if (s_S3TC_Compression)
{
compressed = true;
switch(image->getPixelFormat())
{
case(3):
@@ -421,33 +430,102 @@ void Texture::applyTexImage(GLenum target, Image* image, State& state) const
// when use 16 bit textures rather than 24/32bit textures.
// internalFormat = GL_RGBA4;
// an experiment to look at the changes in performance
// when use 16 bit textures rather than 24/32bit textures.
// internalFormat = GL_RGBA4;
static PFNGLCOMPRESSEDTEXIMAGE2DARBPROC glCompressedTexImage2D_ptr =
(PFNGLCOMPRESSEDTEXIMAGE2DARBPROC)getGLExtensionFuncPtr("glCompressedTexImage2DARB");
if (_subloadMode == OFF) {
if( _min_filter == LINEAR || _min_filter == NEAREST )
{
glTexImage2D( target, 0, internalFormat,
image->s(), image->t(), 0,
(GLenum)image->getPixelFormat(),
(GLenum)image->getDataType(),
image->data() );
if ( !compressed )
{
glTexImage2D( target, 0, internalFormat,
image->s(), image->t(), 0,
(GLenum)image->getPixelFormat(),
(GLenum)image->getDataType(),
image->data() );
// just estimate estimate it right now..
// note, ignores texture compression..
_textureObjectSize = image->s()*image->t()*4;
// just estimate estimate it right now..
// note, ignores texture compression..
_textureObjectSize = image->s()*image->t()*4;
}
else if(glCompressedTexImage2D_ptr)
{
GLint blockSize = ( internalFormat == GL_COMPRESSED_RGB_S3TC_DXT1_EXT ? 8 : 16 );
GLint size = ((image->s()+3)/4)*((image->t()+3)/4)*blockSize;
glCompressedTexImage2D_ptr(target, 0, internalFormat,
image->s(), image->t(),0,
size,
image->data());
_textureObjectSize = size;
}
}
else
{
gluBuild2DMipmaps( target, internalFormat,
if(!image->isMipmap())
{
gluBuild2DMipmaps( target, internalFormat,
image->s(),image->t(),
(GLenum)image->getPixelFormat(), (GLenum)image->getDataType(),
image->data() );
// just estimate size it right now..
// crude x2 multiplier to account for minmap storage.
// note, ignores texture compression..
_textureObjectSize = image->s()*image->t()*4;
}
else
{
_textureObjectSize = 0;
size_t no_mipmaps = image->getNumMipmaps();
int width = image->s();
int height = image->t();
if( !compressed )
{
for( size_t k = 0 ; k < no_mipmaps && (width || height) ;k++)
{
if (width == 0)
width = 1;
if (height == 0)
height = 1;
// just estimate size it right now..
// crude x2 multiplier to account for minmap storage.
// note, ignores texture compression..
_textureObjectSize = image->s()*image->t()*4;
glTexImage2D( target, k, internalFormat,
width, height, 0,
(GLenum)image->getPixelFormat(),
(GLenum)image->getDataType(),
image->getMipmapData(k));
_textureObjectSize += width*height*4;
width >>= 1;
height >>= 1;
}
}
else if(glCompressedTexImage2D_ptr)
{
GLint blockSize = ( internalFormat == GL_COMPRESSED_RGB_S3TC_DXT1_EXT ? 8 : 16 );
GLint size = 0;
for( size_t k = 0 ; k < no_mipmaps && (width || height) ;k++)
{
if (width == 0)
width = 1;
if (height == 0)
height = 1;
size = ((width+3)/4)*((height+3)/4)*blockSize;
glCompressedTexImage2D_ptr(target, k, internalFormat,
width, height, 0, size, image->getMipmapData(k));
_textureObjectSize += size;
width >>= 1;
height >>= 1;
}
}
}
}