radv: avoid PS partial flushes when viewports/scissors don't change

For Vega10 and Raven that need a special workaround for the
scissor bug.

This seems to give a minor boost for Talos and Dota 2, at least.

To reduce the cost of memcmp, the driver checks if it's
really useful to do the comparison.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

diff --git a/src/amd/vulkan/radv_cmd_buffer.c b/src/amd/vulkan/radv_cmd_buffer.c
index 665ee87..d8f780c 100644 (file)
--- a/src/amd/vulkan/radv_cmd_buffer.c
+++ b/src/amd/vulkan/radv_cmd_buffer.c
@@ -2733,15 +2733,28 @@ void radv_CmdSetViewport(
        const VkViewport*                           pViewports)
 {
        RADV_FROM_HANDLE(radv_cmd_buffer, cmd_buffer, commandBuffer);
+       struct radv_cmd_state *state = &cmd_buffer->state;
        MAYBE_UNUSED const uint32_t total_count = firstViewport + viewportCount;
 
        assert(firstViewport < MAX_VIEWPORTS);
        assert(total_count >= 1 && total_count <= MAX_VIEWPORTS);
 
-       memcpy(cmd_buffer->state.dynamic.viewport.viewports + firstViewport,
-              pViewports, viewportCount * sizeof(*pViewports));
+       if (cmd_buffer->device->physical_device->has_scissor_bug) {
+               /* Try to skip unnecessary PS partial flushes when the viewports
+                * don't change.
+                */
+               if (!(state->dirty & (RADV_CMD_DIRTY_DYNAMIC_VIEWPORT |
+                                     RADV_CMD_DIRTY_DYNAMIC_SCISSOR)) &&
+                   !memcmp(state->dynamic.viewport.viewports + firstViewport,
+                           pViewports, viewportCount * sizeof(*pViewports))) {
+                       return;
+               }
+       }
+
+       memcpy(state->dynamic.viewport.viewports + firstViewport, pViewports,
+              viewportCount * sizeof(*pViewports));
 
-       cmd_buffer->state.dirty |= RADV_CMD_DIRTY_DYNAMIC_VIEWPORT;
+       state->dirty |= RADV_CMD_DIRTY_DYNAMIC_VIEWPORT;
 }
 
 void radv_CmdSetScissor(
@@ -2751,14 +2764,28 @@ void radv_CmdSetScissor(
        const VkRect2D*                             pScissors)
 {
        RADV_FROM_HANDLE(radv_cmd_buffer, cmd_buffer, commandBuffer);
+       struct radv_cmd_state *state = &cmd_buffer->state;
        MAYBE_UNUSED const uint32_t total_count = firstScissor + scissorCount;
 
        assert(firstScissor < MAX_SCISSORS);
        assert(total_count >= 1 && total_count <= MAX_SCISSORS);
 
-       memcpy(cmd_buffer->state.dynamic.scissor.scissors + firstScissor,
-              pScissors, scissorCount * sizeof(*pScissors));
-       cmd_buffer->state.dirty |= RADV_CMD_DIRTY_DYNAMIC_SCISSOR;
+       if (cmd_buffer->device->physical_device->has_scissor_bug) {
+               /* Try to skip unnecessary PS partial flushes when the scissors
+                * don't change.
+                */
+               if (!(state->dirty & (RADV_CMD_DIRTY_DYNAMIC_VIEWPORT |
+                                     RADV_CMD_DIRTY_DYNAMIC_SCISSOR)) &&
+                   !memcmp(state->dynamic.scissor.scissors + firstScissor,
+                           pScissors, scissorCount * sizeof(*pScissors))) {
+                       return;
+               }
+       }
+
+       memcpy(state->dynamic.scissor.scissors + firstScissor, pScissors,
+              scissorCount * sizeof(*pScissors));
+
+       state->dirty |= RADV_CMD_DIRTY_DYNAMIC_SCISSOR;
 }
 
 void radv_CmdSetLineWidth(