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[cogl journal] Perform software modelview transform on logged quads.

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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)
This commit is contained in:
Robert Bragg
2009-06-17 01:31:36 +01:00
parent 612a1e2dea
commit efbf483d8c
3 changed files with 120 additions and 44 deletions
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3
clutter/cogl/common/cogl-debug.c
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@ -45,7 +45,8 @@ static const GDebugKey cogl_debug_keys[] = {
{ "client-side-matrices", COGL_DEBUG_FORCE_CLIENT_SIDE_MATRICES },
{ "disable-vbos", COGL_DEBUG_DISABLE_VBOS },
{ "journal", COGL_DEBUG_JOURNAL },
{ "batching", COGL_DEBUG_BATCHING }
{ "batching", COGL_DEBUG_BATCHING },
{ "disable-software-transform", COGL_DEBUG_DISABLE_SOFTWARE_TRANSFORM }
};
static const gint n_cogl_debug_keys = G_N_ELEMENTS (cogl_debug_keys);