[Mesa-dev] [PATCH] i965: Don't emit 3DSTATE_SAMPLER_STATE_POINTERS_VS for compute shaders.

[Kenneth Graunke]

For the render pipeline, the upload_sampler_state_table atom emits
3DSTATE_BINDING_TABLE_POINTERS_XS.  It tries to avoid this for compute:

   if (GEN_GEN >= 7 && stage_state->stage != MESA_SHADER_COMPUTE) {
      /* Emit a 3DSTATE_SAMPLER_STATE_POINTERS_XS packet. */
      genX(emit_sampler_state_pointers_xs)(brw, stage_state);
   } ...

However, we were failing to initialize brw->cs.base.stage, so it was
left as 0 (MESA_SHADER_VERTEX), causing this condition to break.  We
then emitted 3DSTATE_SAMPLER_STATE_POINTERS_VS in GPGPU mode, when
trying to upload CS samplers.  Nothing good can come of this.

Cc: mesa-stable at lists.freedesktop.org
---
 src/mesa/drivers/dri/i965/brw_context.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index eed42468b11..95b00bf8fce 100644
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -874,6 +874,7 @@ brwCreateContext(gl_api api,
    brw->tes.base.stage = MESA_SHADER_TESS_EVAL;
    brw->gs.base.stage = MESA_SHADER_GEOMETRY;
    brw->wm.base.stage = MESA_SHADER_FRAGMENT;
+   brw->cs.base.stage = MESA_SHADER_COMPUTE;
    if (devinfo->gen >= 8) {
       brw->vtbl.emit_depth_stencil_hiz = gen8_emit_depth_stencil_hiz;
    } else if (devinfo->gen >= 7) {
-- 
2.15.0