i965 gen6: Implement pass-through GS for transform feedback.

[mesa.git] / src / mesa / drivers / dri / i965 / gen6_gs_state.c

diff --git a/src/mesa/drivers/dri/i965/gen6_gs_state.c b/src/mesa/drivers/dri/i965/gen6_gs_state.c
index d29f0290727db43f805aade3a4b36f259cabbd5c..42962a64d366e97df1bb401a182454a5b6b8a043 100644 (file)
--- a/src/mesa/drivers/dri/i965/gen6_gs_state.c
+++ b/src/mesa/drivers/dri/i965/gen6_gs_state.c
@@ -44,22 +44,36 @@ upload_gs_state(struct brw_context *brw)
    OUT_BATCH(0);
    ADVANCE_BATCH();
 
-   // GS should never be used on Gen6.  Disable it.
-   assert(!brw->gs.prog_active);
-   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();
+   if (brw->gs.prog_active) {
+      BEGIN_BATCH(7);
+      OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
+      OUT_BATCH(brw->gs.prog_offset);
+      OUT_BATCH(GEN6_GS_SPF_MODE | GEN6_GS_VECTOR_MASK_ENABLE);
+      OUT_BATCH(0); /* no scratch space */
+      OUT_BATCH((1 << GEN6_GS_DISPATCH_START_GRF_SHIFT) |
+               (brw->gs.prog_data->urb_read_length << GEN6_GS_URB_READ_LENGTH_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);
+      OUT_BATCH(GEN6_GS_ENABLE);
+      ADVANCE_BATCH();
+   } else {
+      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();
+   }
 }
 
 const struct brw_tracked_state gen6_gs_state = {