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authorBrian Paul <brianp@vmware.com>2015-10-16 16:14:46 -0600
committerBrian Paul <brianp@vmware.com>2015-10-22 17:19:20 -0600
commit99effaa9658a34eb07255bb1964569c8a86e8dda (patch)
tree72f8a3e07161ec7f7a85b857a62bf877734df263
parent129d34da494840628b2bb1cbb6397d50dab3c999 (diff)
svga: try to avoid index generation for some primitive types
The svga device doesn't directly support quads, quad strips or polygons so we have to convert those types to indexed triangle lists. But we can sometimes avoid that if we're drawing flat/constant-colored prims and we don't have to worry about provoking vertex. Reviewed-by: Charmaine Lee <charmainel@vmware.com> Reviewed-by: José Fonseca <jfonseca@vmware.com>
-rw-r--r--src/gallium/drivers/svga/svga_draw_arrays.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/src/gallium/drivers/svga/svga_draw_arrays.c b/src/gallium/drivers/svga/svga_draw_arrays.c
index e4d776443c5..caf4b17de16 100644
--- a/src/gallium/drivers/svga/svga_draw_arrays.c
+++ b/src/gallium/drivers/svga/svga_draw_arrays.c
@@ -218,6 +218,20 @@ svga_hwtnl_draw_arrays(struct svga_hwtnl *hwtnl,
* the hardware wants.
*/
api_pv = hwtnl->hw_pv;
+
+ if (hwtnl->api_fillmode == PIPE_POLYGON_MODE_FILL) {
+ /* Do some simple primitive conversions to avoid index buffer
+ * generation below. Note that polygons and quads are not directly
+ * supported by the svga device. Also note, we can only do this
+ * for flat/constant-colored rendering because of provoking vertex.
+ */
+ if (prim == PIPE_PRIM_POLYGON) {
+ prim = PIPE_PRIM_TRIANGLE_FAN;
+ }
+ else if (prim == PIPE_PRIM_QUADS && count == 4) {
+ prim = PIPE_PRIM_TRIANGLE_FAN;
+ }
+ }
}
if (hwtnl->api_fillmode != PIPE_POLYGON_MODE_FILL &&