From: Ian Romanick <ian.d.roman...@intel.com> If an application requests a generic compressed format for a texture and the driver does not pick a specific compressed format, return the generic base format (e.g., GL_RGBA) for the GL_TEXTURE_INTERNAL_FORMAT query.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=3165 Cc: Brian Paul <bri...@vmware.com> --- src/mesa/main/texparam.c | 20 +++++++++++++++++--- 1 files changed, 17 insertions(+), 3 deletions(-) diff --git a/src/mesa/main/texparam.c b/src/mesa/main/texparam.c index 4b9dcb5..c4ec295 100644 --- a/src/mesa/main/texparam.c +++ b/src/mesa/main/texparam.c @@ -915,9 +915,23 @@ _mesa_GetTexLevelParameteriv( GLenum target, GLint level, *params = _mesa_compressed_format_to_glenum(ctx, texFormat); } else { - /* return the user's requested internal format */ - *params = img->InternalFormat; - } + /* If the true internal format is not compressed but the user + * requested a generic compressed format, we have to return the + * generic base format that matches. + * + * From page 119 (page 129 of the PDF) of the OpenGL 1.3 spec: + * + * "If no specific compressed format is available, + * internalformat is instead replaced by the corresponding base + * internal format." + * + * Otherwise just return the user's requested internal format + */ + const GLenum f = + _mesa_gl_compressed_format_base_format(img->InternalFormat); + + *params = (f != 0) ? f : img->InternalFormat; + } break; case GL_TEXTURE_BORDER: *params = img->Border; -- 1.7.4.4 _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
