radeonsi: Add counter to check if a texture is bound to a framebuffer.

Signed-off-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/drivers/radeon/r600_pipe_common.h

@@ -260,6 +260,11 @@ struct r600_texture {
 	uint8_t				stencil_clear_value;
 
 	bool				non_disp_tiling; /* R600-Cayman only */
+
+	/* Counter that should be non-zero if the texture is bound to a
+	 * framebuffer. Implemented in radeonsi only.
+	 */
+	uint32_t			framebuffers_bound;
 };
 
 struct r600_surface {

src/gallium/drivers/radeonsi/si_pipe.c

@@ -40,6 +40,8 @@ static void si_destroy_context(struct pipe_context *context)
 	struct si_context *sctx = (struct si_context *)context;
 	int i;
 
+	si_dec_framebuffer_counters(&sctx->framebuffer.state);
+
 	si_release_all_descriptors(sctx);
 
 	if (sctx->ce_suballocator)

src/gallium/drivers/radeonsi/si_state.c

@@ -2268,6 +2268,21 @@ static void si_init_depth_surface(struct si_context *sctx,
 	surf->depth_initialized = true;
 }
 
+void si_dec_framebuffer_counters(const struct pipe_framebuffer_state *state)
+{
+	for (int i = 0; i < state->nr_cbufs; ++i) {
+		struct r600_surface *surf = NULL;
+		struct r600_texture *rtex;
+
+		if (!state->cbufs[i])
+			continue;
+		surf = (struct r600_surface*)state->cbufs[i];
+		rtex = (struct r600_texture*)surf->base.texture;
+
+		p_atomic_dec(&rtex->framebuffers_bound);
+	}
+}
+
 static void si_set_framebuffer_state(struct pipe_context *ctx,
 				     const struct pipe_framebuffer_state *state)
 {
@@ -2298,6 +2313,7 @@ static void si_set_framebuffer_state(struct pipe_context *ctx,
 		(1 << MAX2(sctx->framebuffer.state.nr_cbufs, state->nr_cbufs)) - 1;
 	sctx->framebuffer.dirty_zsbuf |= sctx->framebuffer.state.zsbuf != state->zsbuf;
 
+	si_dec_framebuffer_counters(&sctx->framebuffer.state);
 	util_copy_framebuffer_state(&sctx->framebuffer.state, state);
 
 	sctx->framebuffer.spi_shader_col_format = 0;
@@ -2342,6 +2358,8 @@ static void si_set_framebuffer_state(struct pipe_context *ctx,
 			sctx->framebuffer.compressed_cb_mask |= 1 << i;
 		}
 		r600_context_add_resource_size(ctx, surf->base.texture);
+
+		p_atomic_inc(&rtex->framebuffers_bound);
 	}
 	/* Set the second SPI format for possible dual-src blending. */
 	if (i == 1 && surf) {

src/gallium/drivers/radeonsi/si_state.h

@@ -308,6 +308,7 @@ si_create_sampler_view_custom(struct pipe_context *ctx,
 			      const struct pipe_sampler_view *state,
 			      unsigned width0, unsigned height0,
 			      unsigned force_level);
+void si_dec_framebuffer_counters(const struct pipe_framebuffer_state *state);
 
 /* si_state_shader.c */
 bool si_update_shaders(struct si_context *sctx);