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path: root/mesalib/src/mesa/main/texparam.c
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Diffstat (limited to 'mesalib/src/mesa/main/texparam.c')
-rw-r--r--mesalib/src/mesa/main/texparam.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/mesalib/src/mesa/main/texparam.c b/mesalib/src/mesa/main/texparam.c
index 545c44ab9..f62745770 100644
--- a/mesalib/src/mesa/main/texparam.c
+++ b/mesalib/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;