radeonsi: add glClearBufferSubData acceleration

8-bit and 16-bit clears which are not aligned to dwords are done in software.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

diff --git a/src/gallium/drivers/radeonsi/si_blit.c b/src/gallium/drivers/radeonsi/si_blit.c
index d320ac426518211aea42362c1219173c0f4d9942..31f22c4acf71c92ab75029e27557d9c900b58e9b 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_blit.c
+++ b/src/gallium/drivers/radeonsi/si_blit.c
@@ -737,9 +737,69 @@ static void si_flush_resource(struct pipe_context *ctx,
        }
 }
 
+static void si_pipe_clear_buffer(struct pipe_context *ctx,
+                                struct pipe_resource *dst,
+                                unsigned offset, unsigned size,
+                                const void *clear_value_ptr,
+                                int clear_value_size)
+{
+       struct si_context *sctx = (struct si_context*)ctx;
+       uint32_t dword_value;
+       unsigned i;
+
+       assert(offset % clear_value_size == 0);
+       assert(size % clear_value_size == 0);
+
+       if (clear_value_size > 4) {
+               const uint32_t *u32 = clear_value_ptr;
+               bool clear_dword_duplicated = true;
+
+               /* See if we can lower large fills to dword fills. */
+               for (i = 1; i < clear_value_size / 4; i++)
+                       if (u32[0] != u32[i]) {
+                               clear_dword_duplicated = false;
+                               break;
+                       }
+
+               if (!clear_dword_duplicated) {
+                       /* Use transform feedback for 64-bit, 96-bit, and
+                        * 128-bit fills.
+                        */
+                       union pipe_color_union clear_value;
+
+                       memcpy(&clear_value, clear_value_ptr, clear_value_size);
+                       si_blitter_begin(ctx, SI_DISABLE_RENDER_COND);
+                       util_blitter_clear_buffer(sctx->blitter, dst, offset,
+                                                 size, clear_value_size / 4,
+                                                 &clear_value);
+                       si_blitter_end(ctx);
+                       return;
+               }
+       }
+
+       /* Expand the clear value to a dword. */
+       switch (clear_value_size) {
+       case 1:
+               dword_value = *(uint8_t*)clear_value_ptr;
+               dword_value |= (dword_value << 8) |
+                              (dword_value << 16) |
+                              (dword_value << 24);
+               break;
+       case 2:
+               dword_value = *(uint16_t*)clear_value_ptr;
+               dword_value |= dword_value << 16;
+               break;
+       default:
+               dword_value = *(uint32_t*)clear_value_ptr;
+       }
+
+       sctx->b.clear_buffer(ctx, dst, offset, size, dword_value, false);
+}
+
 void si_init_blit_functions(struct si_context *sctx)
 {
        sctx->b.b.clear = si_clear;
+       sctx->b.b.clear_buffer = si_pipe_clear_buffer;
        sctx->b.b.clear_render_target = si_clear_render_target;
        sctx->b.b.clear_depth_stencil = si_clear_depth_stencil;
        sctx->b.b.resource_copy_region = si_resource_copy_region;