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-rw-r--r--src/mesa/drivers/dri/i965/brw_vs_emit.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_vs_emit.c b/src/mesa/drivers/dri/i965/brw_vs_emit.c
index 524f1211ce..1da5a3f502 100644
--- a/src/mesa/drivers/dri/i965/brw_vs_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_vs_emit.c
@@ -69,13 +69,17 @@ static void brw_vs_alloc_regs( struct brw_vs_compile *c )
{
GLuint i, reg = 0, mrf;
-#if 0
- if (c->vp->program.Base.Parameters->NumParameters >= 6)
- c->use_const_buffer = 1;
+ /* Determine whether to use a real constant buffer or use a block
+ * of GRF registers for constants. The later is faster but only
+ * works if everything fits in the GRF.
+ * XXX this heuristic/check may need some fine tuning...
+ */
+ if (c->vp->program.Base.Parameters->NumParameters +
+ c->vp->program.Base.NumTemporaries + 20 > BRW_MAX_GRF)
+ c->use_const_buffer = GL_TRUE;
else
-#endif
c->use_const_buffer = GL_FALSE;
- /*printf("use_const_buffer = %d\n", c->use_const_buffer);*/
+ printf("use_const_buffer = %d\n", c->use_const_buffer);
/* r0 -- reserved as usual
*/