diff options
Diffstat (limited to 'src/mesa/drivers/dri/i965/gen7_sol_state.c')
| -rw-r--r-- | src/mesa/drivers/dri/i965/gen7_sol_state.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/src/mesa/drivers/dri/i965/gen7_sol_state.c b/src/mesa/drivers/dri/i965/gen7_sol_state.c index 11b2e2ecf96..d2c3ae35536 100644 --- a/src/mesa/drivers/dri/i965/gen7_sol_state.c +++ b/src/mesa/drivers/dri/i965/gen7_sol_state.c @@ -223,14 +223,28 @@ upload_3dstate_streamout(struct brw_context *brw, bool active, uint32_t dw1 = 0, dw2 = 0; int i; + /* + * From ARB_transform_feedback3: + * + * "When a generated primitive query for a vertex stream is active, the + * primitives-generated count is incremented every time a primitive + * emitted to that stream reaches the Discarding Rasterization stage + * (see Section 3.x) right before rasterization. This counter is + * incremented whether or not transform feedback is active." + * + * Since we can only keep track of generated primitives for each stream + * in the SOL stage we need to make sure it is always active even if + * transform beedback is not. This way we can track primitives generated + * in each stream via SO_PRIMITIVE_STORAGE_NEEDED. + */ + dw1 |= SO_FUNCTION_ENABLE; + dw1 |= SO_STATISTICS_ENABLE; + if (active) { int urb_entry_read_offset = 0; int urb_entry_read_length = (vue_map->num_slots + 1) / 2 - urb_entry_read_offset; - dw1 |= SO_FUNCTION_ENABLE; - dw1 |= SO_STATISTICS_ENABLE; - /* _NEW_LIGHT */ if (ctx->Light.ProvokingVertex != GL_FIRST_VERTEX_CONVENTION) dw1 |= SO_REORDER_TRAILING; |