broadcom/vc5: Fix simulator assertion failures about color RT clears.

When we tried to clear color while storing depth, it assertion failed
about basically not having enough information to decide which color RT to
clear.  It turns out the STORE_GENERAL picks the buffer according to the
color buffer being stored, or all of them if NONE.  If you're doing depth,
it doesn't know which to pick.

diff --git a/src/gallium/drivers/vc5/vc5_rcl.c b/src/gallium/drivers/vc5/vc5_rcl.c
index 22d6eed..1fa00b2 100644 (file)
--- a/src/gallium/drivers/vc5/vc5_rcl.c
+++ b/src/gallium/drivers/vc5/vc5_rcl.c
@@ -157,6 +157,12 @@ vc5_rcl_emit_generic_per_tile_list(struct vc5_job *job, int last_cbuf)
         bool needs_color_clear = job->cleared & pipe_clear_color_buffers;
         bool needs_z_clear = job->cleared & PIPE_CLEAR_DEPTH;
         bool needs_s_clear = job->cleared & PIPE_CLEAR_STENCIL;
+        /* Note that only the color RT being stored will be cleared by a
+         * STORE_GENERAL, or all of them if the buffer is NONE.
+         */
+        bool msaa_color_clear = (needs_color_clear &&
+                                 (job->cleared & pipe_clear_color_buffers) ==
+                                 (job->resolve & pipe_clear_color_buffers));
 
         uint32_t stores_pending = job->resolve;
 
@@ -176,7 +182,7 @@ vc5_rcl_emit_generic_per_tile_list(struct vc5_job *job, int last_cbuf)
 
                 stores_pending &= ~bit;
                 store_raw(cl, psurf, RENDER_TARGET_0 + i,
-                          !stores_pending && needs_color_clear,
+                          !stores_pending && msaa_color_clear,
                           !stores_pending && needs_z_clear,
                           !stores_pending && needs_s_clear);
 
@@ -189,7 +195,7 @@ vc5_rcl_emit_generic_per_tile_list(struct vc5_job *job, int last_cbuf)
                 stores_pending &= ~PIPE_CLEAR_DEPTHSTENCIL;
                 store_raw(cl, job->zsbuf,
                           zs_buffer_from_pipe_bits(job->resolve),
-                          !stores_pending && needs_color_clear,
+                          false,
                           !stores_pending && needs_z_clear,
                           !stores_pending && needs_s_clear);
 
@@ -205,6 +211,9 @@ vc5_rcl_emit_generic_per_tile_list(struct vc5_job *job, int last_cbuf)
                         store.enable_z_write = stores_pending & PIPE_CLEAR_DEPTH;
                         store.enable_stencil_write = stores_pending & PIPE_CLEAR_STENCIL;
 
+                        /* Note that when set this will clear all of the color
+                         * buffers.
+                         */
                         store.disable_colour_buffers_clear_on_write =
                                 !needs_color_clear;
                         store.disable_z_buffer_clear_on_write =
@@ -212,6 +221,14 @@ vc5_rcl_emit_generic_per_tile_list(struct vc5_job *job, int last_cbuf)
                         store.disable_stencil_buffer_clear_on_write =
                                 !needs_s_clear;
                 };
+        } else if (needs_color_clear && !msaa_color_clear) {
+                /* If we had MSAA color stores that didn't match the set of
+                 * MSAA color clears, then we need to clear the color buffers
+                 * now.
+                 */
+                cl_emit(&job->rcl, STORE_TILE_BUFFER_GENERAL, store) {
+                        store.buffer_to_store = NONE;
+                }
         }
 
         cl_emit(cl, RETURN_FROM_SUB_LIST, ret);