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-rw-r--r--src/gallium/drivers/freedreno/freedreno_lowering.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/src/gallium/drivers/freedreno/freedreno_lowering.h b/src/gallium/drivers/freedreno/freedreno_lowering.h
index 2862e5d3b6b..2d36d8faf81 100644
--- a/src/gallium/drivers/freedreno/freedreno_lowering.h
+++ b/src/gallium/drivers/freedreno/freedreno_lowering.h
@@ -33,6 +33,25 @@
#include "tgsi/tgsi_scan.h"
struct fd_lowering_config {
+ /* For fragment shaders, generate a shader that emulates two
+ * sided color by inserting a BGCOLOR input for each COLOR
+ * input, and insert a CMP instruction to select the correct
+ * color to use based on the TGSI_SEMANTIC_FACE input.
+ *
+ * Note that drivers which use this to emulate two sided color
+ * will:
+ * a) need to generate (on demand) alternate shaders to use
+ * depending on the rasterizer state (ie. whether two
+ * sided shading enabled)
+ * b) expect to see the BGCOLOR semantic name in fragment
+ * shaders. During linkage, the driver should simply
+ * map VS.OUT.BGCOLOR[n] to FS.IN.BGCOLOR[n] (in the
+ * same was as linking other outs/ins).
+ */
+ unsigned color_two_side : 1;
+
+ /* TODO support for alpha_to_one as well?? */
+
/* Individual OPC lowerings, if lower_<opc> is TRUE then
* enable lowering of TGSI_OPCODE_<opc>
*/