radeonsi: split sample locations into its own state atom

Sample locations are not updated as often as framebuffers.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

src/gallium/drivers/radeonsi/si_hw_context.c

@@ -145,6 +145,7 @@ void si_begin_new_cs(struct si_context *ctx)
 
 	ctx->clip_regs.dirty = true;
 	ctx->framebuffer.atom.dirty = true;
+	ctx->msaa_sample_locs.dirty = true;
 	ctx->msaa_config.dirty = true;
 	ctx->db_render_state.dirty = true;
 	ctx->b.streamout.enable_atom.dirty = true;

src/gallium/drivers/radeonsi/si_pipe.c

@@ -112,6 +112,9 @@ static struct pipe_context *si_create_context(struct pipe_screen *screen, void *
 	sctx->cache_flush = si_atom_cache_flush;
 	sctx->atoms.s.cache_flush = &sctx->cache_flush;
 
+	sctx->msaa_sample_locs = si_atom_msaa_sample_locs;
+	sctx->atoms.s.msaa_sample_locs = &sctx->msaa_sample_locs;
+
 	sctx->msaa_config = si_atom_msaa_config;
 	sctx->atoms.s.msaa_config = &sctx->msaa_config;
 

src/gallium/drivers/radeonsi/si_pipe.h

@@ -151,6 +151,7 @@ struct si_context {
 			struct r600_atom *streamout_begin;
 			struct r600_atom *streamout_enable; /* must be after streamout_begin */
 			struct r600_atom *framebuffer;
+			struct r600_atom *msaa_sample_locs;
 			struct r600_atom *db_render_state;
 			struct r600_atom *msaa_config;
 			struct r600_atom *clip_regs;
@@ -181,6 +182,7 @@ struct si_context {
 	unsigned			border_color_offset;
 
 	struct r600_atom		clip_regs;
+	struct r600_atom		msaa_sample_locs;
 	struct r600_atom		msaa_config;
 	int				ps_iter_samples;
 

src/gallium/drivers/radeonsi/si_state.c

@@ -2093,6 +2093,8 @@ static void si_set_framebuffer_state(struct pipe_context *ctx,
 		constbuf.buffer_size = sctx->framebuffer.nr_samples * 2 * 4;
 		ctx->set_constant_buffer(ctx, PIPE_SHADER_FRAGMENT,
 					 SI_DRIVER_STATE_CONST_BUF, &constbuf);
+
+		sctx->msaa_sample_locs.dirty = true;
 	}
 }
 
@@ -2196,10 +2198,19 @@ static void si_emit_framebuffer_state(struct si_context *sctx, struct r600_atom
         /* PA_SC_WINDOW_SCISSOR_TL is set in si_init_config() */
 	r600_write_context_reg(cs, R_028208_PA_SC_WINDOW_SCISSOR_BR,
 			       S_028208_BR_X(state->width) | S_028208_BR_Y(state->height));
+}
+
+static void si_emit_msaa_sample_locs(struct r600_common_context *rctx,
+				     struct r600_atom *atom)
+{
+	struct si_context *sctx = (struct si_context *)rctx;
+	struct radeon_winsys_cs *cs = sctx->b.rings.gfx.cs;
 
 	cayman_emit_msaa_sample_locs(cs, sctx->framebuffer.nr_samples);
 }
 
+const struct r600_atom si_atom_msaa_sample_locs = { si_emit_msaa_sample_locs, 18 }; /* number of CS dwords */
+
 static void si_emit_msaa_config(struct r600_common_context *rctx, struct r600_atom *atom)
 {
 	struct si_context *sctx = (struct si_context *)rctx;

src/gallium/drivers/radeonsi/si_state.h

@@ -269,6 +269,7 @@ void si_init_shader_functions(struct si_context *sctx);
 
 /* si_state_draw.c */
 extern const struct r600_atom si_atom_cache_flush;
+extern const struct r600_atom si_atom_msaa_sample_locs;
 extern const struct r600_atom si_atom_msaa_config;
 void si_emit_cache_flush(struct r600_common_context *sctx, struct r600_atom *atom);
 void si_draw_vbo(struct pipe_context *ctx, const struct pipe_draw_info *dinfo);