radeonsi: implement SAMPLEPOS fragment shader input

The sample positions are read from a constant buffer.

3 files changed, 28 insertions, 0 deletions

diff --git a/src/gallium/drivers/radeon/cayman_msaa.c b/src/gallium/drivers/radeon/cayman_msaa.c
index 8727f3e2359..47fc5c497f1 100644
--- a/src/gallium/drivers/radeon/cayman_msaa.c
+++ b/src/gallium/drivers/radeon/cayman_msaa.c
@@ -123,6 +123,23 @@ void cayman_get_sample_position(struct pipe_context *ctx, unsigned sample_count,
 	}
 }
 
+void cayman_init_msaa(struct pipe_context *ctx)
+{
+	struct r600_common_context *rctx = (struct r600_common_context*)ctx;
+	int i;
+
+	cayman_get_sample_position(ctx, 1, 0, rctx->sample_locations_1x[0]);
+
+	for (i = 0; i < 2; i++)
+		cayman_get_sample_position(ctx, 2, i, rctx->sample_locations_2x[i]);
+	for (i = 0; i < 4; i++)
+		cayman_get_sample_position(ctx, 4, i, rctx->sample_locations_4x[i]);
+	for (i = 0; i < 8; i++)
+		cayman_get_sample_position(ctx, 8, i, rctx->sample_locations_8x[i]);
+	for (i = 0; i < 16; i++)
+		cayman_get_sample_position(ctx, 16, i, rctx->sample_locations_16x[i]);
+}
+
 void cayman_emit_msaa_sample_locs(struct radeon_winsys_cs *cs, int nr_samples)
 {
 	switch (nr_samples) {
diff --git a/src/gallium/drivers/radeon/r600_pipe_common.c b/src/gallium/drivers/radeon/r600_pipe_common.c
index 70c4d1adefb..4c6cf0e60c1 100644
--- a/src/gallium/drivers/radeon/r600_pipe_common.c
+++ b/src/gallium/drivers/radeon/r600_pipe_common.c
@@ -154,6 +154,7 @@ bool r600_common_context_init(struct r600_common_context *rctx,
 	r600_init_context_texture_functions(rctx);
 	r600_streamout_init(rctx);
 	r600_query_init(rctx);
+	cayman_init_msaa(&rctx->b);
 
 	rctx->allocator_so_filled_size = u_suballocator_create(&rctx->b, 4096, 4,
 							       0, PIPE_USAGE_DEFAULT, TRUE);
diff --git a/src/gallium/drivers/radeon/r600_pipe_common.h b/src/gallium/drivers/radeon/r600_pipe_common.h
index b7e4e65cf11..d82adf5d387 100644
--- a/src/gallium/drivers/radeon/r600_pipe_common.h
+++ b/src/gallium/drivers/radeon/r600_pipe_common.h
@@ -357,6 +357,15 @@ struct r600_common_context {
 	boolean				saved_render_cond_cond;
 	unsigned			saved_render_cond_mode;
 
+	/* MSAA sample locations.
+	 * The first index is the sample index.
+	 * The second index is the coordinate: X, Y. */
+	float				sample_locations_1x[1][2];
+	float				sample_locations_2x[2][2];
+	float				sample_locations_4x[4][2];
+	float				sample_locations_8x[8][2];
+	float				sample_locations_16x[16][2];
+
 	/* Copy one resource to another using async DMA. */
 	void (*dma_copy)(struct pipe_context *ctx,
 			 struct pipe_resource *dst,
@@ -472,6 +481,7 @@ extern const uint32_t eg_sample_locs_4x[4];
 extern const unsigned eg_max_dist_4x;
 void cayman_get_sample_position(struct pipe_context *ctx, unsigned sample_count,
 				unsigned sample_index, float *out_value);
+void cayman_init_msaa(struct pipe_context *ctx);
 void cayman_emit_msaa_sample_locs(struct radeon_winsys_cs *cs, int nr_samples);
 void cayman_emit_msaa_config(struct radeon_winsys_cs *cs, int nr_samples,
 			     int ps_iter_samples);