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authorEric Anholt <eric@anholt.net>2012-07-27 15:57:07 -0700
committerEric Anholt <eric@anholt.net>2012-08-09 09:07:49 -0700
commitb3367f56d880550befb31a0100c448e1d607915f (patch)
tree9009b50636ec4b00ba8ee8814012bc5c3092380f /src/mesa/drivers/dri
parent3eb8d7122507600ca7c65f8f3fd0e9e9dee7a432 (diff)
i965/vs: Convert EdgeFlagPointer values appropriately for the VS on gen4.
Fixes piglit gl-2.0/edgeflag. NOTE: This is a candidate for the 8.0 branch. Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Diffstat (limited to 'src/mesa/drivers/dri')
-rw-r--r--src/mesa/drivers/dri/i965/brw_draw_upload.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_draw_upload.c b/src/mesa/drivers/dri/i965/brw_draw_upload.c
index 82dd81d03c..b606de226b 100644
--- a/src/mesa/drivers/dri/i965/brw_draw_upload.c
+++ b/src/mesa/drivers/dri/i965/brw_draw_upload.c
@@ -721,6 +721,16 @@ static void brw_emit_vertices(struct brw_context *brw)
uint32_t comp2 = BRW_VE1_COMPONENT_STORE_SRC;
uint32_t comp3 = BRW_VE1_COMPONENT_STORE_SRC;
+ /* The gen4 driver expects edgeflag to come in as a float, and passes
+ * that float on to the tests in the clipper. Mesa's current vertex
+ * attribute value for EdgeFlag is stored as a float, which works out.
+ * glEdgeFlagPointer, on the other hand, gives us an unnormalized
+ * integer ubyte. Just rewrite that to convert to a float.
+ */
+ if (input->attrib == VERT_ATTRIB_EDGEFLAG &&
+ format == BRW_SURFACEFORMAT_R8_UINT)
+ format = BRW_SURFACEFORMAT_R8_SSCALED;
+
switch (input->glarray->Size) {
case 0: comp0 = BRW_VE1_COMPONENT_STORE_0;
case 1: comp1 = BRW_VE1_COMPONENT_STORE_0;