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work around egregious driver bug

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This commit is contained in:
David Rose 2008-08-16 00:23:15 +00:00
parent 0423cdd69d
commit 33b54effd2
1 changed files with 9 additions and 1 deletions
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10
panda/src/glstuff/glGraphicsStateGuardian_src.cxx
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@ -7772,7 +7772,15 @@ extract_texture_image(PTA_uchar &image, size_t &page_size,
GLP(GetTexLevelParameteriv)(target, n, GL_TEXTURE_COMPRESSED_IMAGE_SIZE, &image_size); GLP(GetTexLevelParameteriv)(target, n, GL_TEXTURE_COMPRESSED_IMAGE_SIZE, &image_size);
page_size = image_size / tex->get_z_size(); page_size = image_size / tex->get_z_size();
image = PTA_uchar::empty_array(image_size); image = PTA_uchar::empty_array(image_size);
_glGetCompressedTexImage(target, n, image.p());
// Some drivers (ATI!) seem to try to overstuff more bytes in the
// array than they asked us to allocate (that is, more bytes than
// GL_TEXTURE_COMPRESSED_IMAGE_SIZE), requiring us to overallocate
// and then copy the result into our final buffer. Sheesh.
unsigned char *buffer = (unsigned char *)alloca(image_size + 32);
_glGetCompressedTexImage(target, n, buffer);
memcpy(image.p(), buffer, image_size);
} }
// Now see if we were successful. // Now see if we were successful.