i965: execution of frag-shader when it has atomic buffer

Ensure that the GPU spawns the fragment shader thread for those
fragment shaders with atomic buffer access.

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Signed-off-by: Kevin Rogovin <kevin.rogovin@intel.com>

src/mesa/drivers/dri/i965/gen7_wm_state.c

@@ -77,6 +77,10 @@ upload_wm_state(struct brw_context *brw)
       dw1 |= GEN7_WM_KILL_ENABLE;
    }
 
+   if (_mesa_active_fragment_shader_has_atomic_ops(&brw->ctx)) {
+      dw1 |= GEN7_WM_DISPATCH_ENABLE;
+   }
+
    /* _NEW_BUFFERS | _NEW_COLOR */
    if (brw_color_buffer_write_enabled(brw) || writes_depth ||
        dw1 & GEN7_WM_KILL_ENABLE) {

src/mesa/drivers/dri/i965/gen8_ps_state.c

@@ -58,6 +58,9 @@ gen8_upload_ps_extra(struct brw_context *brw,
    if (prog_data->uses_omask)
       dw1 |= GEN8_PSX_OMASK_TO_RENDER_TARGET;
 
+   if (_mesa_active_fragment_shader_has_atomic_ops(&brw->ctx))
+      dw1 |= GEN8_PSX_SHADER_HAS_UAV;
+
    BEGIN_BATCH(2);
    OUT_BATCH(_3DSTATE_PS_EXTRA << 16 | (2 - 2));
    OUT_BATCH(dw1);