+static void
+brw_wm_payload_setup(struct brw_context *brw,
+ struct brw_wm_compile *c)
+{
+ struct intel_context *intel = &brw->intel;
+ bool uses_depth = (c->fp->program.Base.InputsRead &
+ (1 << FRAG_ATTRIB_WPOS)) != 0;
+
+ if (intel->gen >= 6) {
+ /* R0-1: masks, pixel X/Y coordinates. */
+ c->nr_payload_regs = 2;
+ /* R2: only for 32-pixel dispatch.*/
+ /* R3-4: perspective pixel location barycentric */
+ c->nr_payload_regs += 2;
+ /* R5-6: perspective pixel location bary for dispatch width != 8 */
+ if (c->dispatch_width == 16) {
+ c->nr_payload_regs += 2;
+ }
+ /* R7-10: perspective centroid barycentric */
+ /* R11-14: perspective sample barycentric */
+ /* R15-18: linear pixel location barycentric */
+ /* R19-22: linear centroid barycentric */
+ /* R23-26: linear sample barycentric */
+
+ /* R27: interpolated depth if uses source depth */
+ if (uses_depth) {
+ c->source_depth_reg = c->nr_payload_regs;
+ c->nr_payload_regs++;
+ if (c->dispatch_width == 16) {
+ /* R28: interpolated depth if not 8-wide. */
+ c->nr_payload_regs++;
+ }
+ }
+ /* R29: interpolated W set if GEN6_WM_USES_SOURCE_W.
+ */
+ if (uses_depth) {
+ c->source_w_reg = c->nr_payload_regs;
+ c->nr_payload_regs++;
+ if (c->dispatch_width == 16) {
+ /* R30: interpolated W if not 8-wide. */
+ c->nr_payload_regs++;
+ }
+ }
+ /* R31: MSAA position offsets. */
+ /* R32-: bary for 32-pixel. */
+ /* R58-59: interp W for 32-pixel. */
+
+ if (c->fp->program.Base.OutputsWritten &
+ BITFIELD64_BIT(FRAG_RESULT_DEPTH)) {
+ c->source_depth_to_render_target = GL_TRUE;
+ c->computes_depth = GL_TRUE;
+ }
+ } else {
+ brw_wm_lookup_iz(intel, c);
+ }
+}