r600g: implement compression for MSAA colorbuffers for evergreen

This adds the FMASK and CMASK buffers. They share the same resource
with color data.

COMPRESSION and FAST_CLEAR are always enabled if both FMASK and CMASK are
allocated. We initialize the CMASK to a "compressed" state (not "fast cleared"),
so that we can keep FAST_CLEAR enabled all the time.

Both FMASK and CMASK must be present at the moment. If either one is missing,
the other one is not used.

v2: add cayman regs in the list

Reviewed-by: Jerome Glisse <[email protected]>

2 files changed, 50 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/util/u_blitter.c b/src/gallium/auxiliary/util/u_blitter.c
index 25c7119b9f2..ad4ccd9eb46 100644
--- a/src/gallium/auxiliary/util/u_blitter.c
+++ b/src/gallium/auxiliary/util/u_blitter.c
@@ -1553,3 +1553,48 @@ void util_blitter_custom_resolve_color(struct blitter_context *blitter,
    pipe_surface_reference(&srcsurf, NULL);
    pipe_surface_reference(&dstsurf, NULL);
 }
+
+void util_blitter_custom_color(struct blitter_context *blitter,
+                               struct pipe_surface *dstsurf,
+                               void *custom_blend)
+{
+   struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
+   struct pipe_context *pipe = ctx->base.pipe;
+   struct pipe_framebuffer_state fb_state;
+
+   assert(dstsurf->texture);
+   if (!dstsurf->texture)
+      return;
+
+   /* check the saved state */
+   blitter_set_running_flag(ctx);
+   blitter_check_saved_vertex_states(ctx);
+   blitter_check_saved_fragment_states(ctx);
+   blitter_check_saved_fb_state(ctx);
+
+   /* bind states */
+   pipe->bind_blend_state(pipe, custom_blend);
+   pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_stencil);
+   pipe->bind_fs_state(pipe, blitter_get_fs_col(ctx, 1, FALSE));
+   pipe->bind_vertex_elements_state(pipe, ctx->velem_state);
+   pipe->set_sample_mask(pipe, (1ull << MAX2(1, dstsurf->texture->nr_samples)) - 1);
+
+   /* set a framebuffer state */
+   fb_state.width = dstsurf->width;
+   fb_state.height = dstsurf->height;
+   fb_state.nr_cbufs = 1;
+   fb_state.cbufs[0] = dstsurf;
+   fb_state.zsbuf = 0;
+   pipe->set_framebuffer_state(pipe, &fb_state);
+   pipe->set_sample_mask(pipe, ~0);
+
+   blitter_set_common_draw_rect_state(ctx);
+   blitter_set_dst_dimensions(ctx, dstsurf->width, dstsurf->height);
+   blitter->draw_rectangle(blitter, 0, 0, dstsurf->width, dstsurf->height,
+                           0, 0, NULL);
+
+   blitter_restore_vertex_states(ctx);
+   blitter_restore_fragment_states(ctx);
+   blitter_restore_fb_state(ctx);
+   blitter_unset_running_flag(ctx);
+}
diff --git a/src/gallium/auxiliary/util/u_blitter.h b/src/gallium/auxiliary/util/u_blitter.h
index f227902c163..e06e8b12d53 100644
--- a/src/gallium/auxiliary/util/u_blitter.h
+++ b/src/gallium/auxiliary/util/u_blitter.h
@@ -308,6 +308,11 @@ void util_blitter_custom_depth_stencil(struct blitter_context *blitter,
 				       unsigned sample_mask,
 				       void *dsa_stage, float depth);
 
+/* Used by r600g for color decompression. */
+void util_blitter_custom_color(struct blitter_context *blitter,
+                               struct pipe_surface *dstsurf,
+                               void *custom_blend);
+
 /* Used by r600g for MSAA color resolve. */
 void util_blitter_custom_resolve_color(struct blitter_context *blitter,
                                        struct pipe_resource *dst,