+static void
+upload_gs_state(struct brw_context *brw)
+{
+ /* BRW_NEW_GEOMETRY_PROGRAM */
+ bool active = brw->geometry_program;
+ /* BRW_NEW_GS_PROG_DATA */
+ const struct brw_vue_prog_data *prog_data = &brw->gs.prog_data->base;
+ const struct brw_stage_state *stage_state = &brw->gs.base;
+
+ if (!active || stage_state->push_const_size == 0) {
+ /* Disable the push constant buffers. */
+ BEGIN_BATCH(5);
+ OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 | (5 - 2));
+ OUT_BATCH(0);
+ OUT_BATCH(0);
+ OUT_BATCH(0);
+ OUT_BATCH(0);
+ ADVANCE_BATCH();
+ } else {
+ BEGIN_BATCH(5);
+ OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 |
+ GEN6_CONSTANT_BUFFER_0_ENABLE |
+ (5 - 2));
+ /* Pointer to the GS constant buffer. Covered by the set of
+ * state flags from gen6_upload_vs_constants
+ */
+ OUT_BATCH(stage_state->push_const_offset +
+ stage_state->push_const_size - 1);
+ OUT_BATCH(0);
+ OUT_BATCH(0);
+ OUT_BATCH(0);
+ ADVANCE_BATCH();
+ }
+
+ if (active) {
+ BEGIN_BATCH(7);
+ OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
+ OUT_BATCH(stage_state->prog_offset);
+
+ /* GEN6_GS_SPF_MODE and GEN6_GS_VECTOR_MASK_ENABLE are enabled as it
+ * was previously done for gen6.
+ *
+ * TODO: test with both disabled to see if the HW is behaving
+ * as expected, like in gen7.
+ */
+ OUT_BATCH(GEN6_GS_SPF_MODE | GEN6_GS_VECTOR_MASK_ENABLE |
+ ((ALIGN(stage_state->sampler_count, 4)/4) <<
+ GEN6_GS_SAMPLER_COUNT_SHIFT) |
+ ((prog_data->base.binding_table.size_bytes / 4) <<
+ GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT));
+
+ if (prog_data->base.total_scratch) {
+ OUT_RELOC(stage_state->scratch_bo,
+ I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
+ ffs(prog_data->base.total_scratch) - 11);
+ } else {
+ OUT_BATCH(0); /* no scratch space */
+ }
+
+ OUT_BATCH((prog_data->urb_read_length <<
+ GEN6_GS_URB_READ_LENGTH_SHIFT) |
+ (0 << GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT) |
+ (prog_data->base.dispatch_grf_start_reg <<
+ GEN6_GS_DISPATCH_START_GRF_SHIFT));
+
+ OUT_BATCH(((brw->max_gs_threads - 1) << GEN6_GS_MAX_THREADS_SHIFT) |
+ GEN6_GS_STATISTICS_ENABLE |
+ GEN6_GS_SO_STATISTICS_ENABLE |
+ GEN6_GS_RENDERING_ENABLE);
+
+ if (brw->gs.prog_data->gen6_xfb_enabled) {
+ /* GEN6_GS_REORDER is equivalent to GEN7_GS_REORDER_TRAILING
+ * in gen7. SNB and IVB specs are the same regarding the reordering of
+ * TRISTRIP/TRISTRIP_REV vertices and triangle orientation, so we do
+ * the same thing in both generations. For more details, see the
+ * comment in gen7_gs_state.c
+ */
+ OUT_BATCH(GEN6_GS_REORDER |
+ GEN6_GS_SVBI_PAYLOAD_ENABLE |
+ GEN6_GS_ENABLE);
+ } else {
+ OUT_BATCH(GEN6_GS_REORDER | GEN6_GS_ENABLE);
+ }
+ ADVANCE_BATCH();
+ } else if (brw->ff_gs.prog_active) {
+ /* In gen6, transform feedback for the VS stage is done with an ad-hoc GS
+ * program. This function provides the needed 3DSTATE_GS for this.
+ */
+ upload_gs_state_for_tf(brw);
+ } else {
+ /* No GS function required */
+ BEGIN_BATCH(7);
+ OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
+ OUT_BATCH(0); /* prog_bo */
+ OUT_BATCH((0 << GEN6_GS_SAMPLER_COUNT_SHIFT) |
+ (0 << GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT));
+ OUT_BATCH(0); /* scratch space base offset */
+ OUT_BATCH((1 << GEN6_GS_DISPATCH_START_GRF_SHIFT) |
+ (0 << GEN6_GS_URB_READ_LENGTH_SHIFT) |
+ (0 << GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT));
+ OUT_BATCH((0 << GEN6_GS_MAX_THREADS_SHIFT) |
+ GEN6_GS_STATISTICS_ENABLE |
+ GEN6_GS_RENDERING_ENABLE);
+ OUT_BATCH(0);
+ ADVANCE_BATCH();
+ }
+ brw->gs.enabled = active;
+}
+