f2f4f5f06f
Since most Clutter actors aren't much more than textured quads; flushing the journal typically involves lots of 'change modelview; draw quad' sequences. The amount of overhead involved in uploading a new modelview and queuing that primitive is huge in comparison to simply transforming 4 vertices by the current modelview when logging quads. (Note if your GPU supports HW vertex transform, then it still does the projective and viewport transforms) At the same time a --cogl-debug=disable-software-transform option has been added for comparison and debugging. This change allows typical pick scenes to be batched into a single draw call and I'm seeing test-pick run over 200% faster with this. (i965 + Mesa 7.6-devel)