[Mesa-dev] [PATCH 11/15] radv: gather stream output info

[Samuel Pitoiset]

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
---
 src/amd/vulkan/radv_private.h     |  3 +++
 src/amd/vulkan/radv_shader.h      | 18 ++++++++++++++
 src/amd/vulkan/radv_shader_info.c | 39 +++++++++++++++++++++++++++++++
 3 files changed, 60 insertions(+)

diff --git a/src/amd/vulkan/radv_private.h b/src/amd/vulkan/radv_private.h
index 33ba8a7354..de54e63074 100644
--- a/src/amd/vulkan/radv_private.h
+++ b/src/amd/vulkan/radv_private.h
@@ -99,6 +99,9 @@ typedef uint32_t xcb_window_t;
 #define NUM_META_FS_KEYS 12
 #define RADV_MAX_DRM_DEVICES 8
 #define MAX_VIEWS        8
+#define MAX_SO_STREAMS 4
+#define MAX_SO_BUFFERS 4
+#define MAX_SO_OUTPUTS 64
 
 #define NUM_DEPTH_CLEAR_PIPELINES 3
 
diff --git a/src/amd/vulkan/radv_shader.h b/src/amd/vulkan/radv_shader.h
index dc6c48d306..870e4af0b1 100644
--- a/src/amd/vulkan/radv_shader.h
+++ b/src/amd/vulkan/radv_shader.h
@@ -143,6 +143,22 @@ enum radv_ud_index {
 	AC_UD_TES_MAX_UD,
 	AC_UD_MAX_UD = AC_UD_TCS_MAX_UD,
 };
+
+struct radv_stream_output {
+	uint8_t location;
+	uint8_t buffer;
+	uint16_t offset;
+	uint8_t component_mask;
+	uint8_t stream;
+};
+
+struct radv_streamout_info {
+	uint16_t num_outputs;
+	struct radv_stream_output outputs[MAX_SO_OUTPUTS];
+	uint16_t strides[MAX_SO_BUFFERS];
+	uint32_t enabled_stream_buffers_mask;
+};
+
 struct radv_shader_info {
 	bool loads_push_constants;
 	uint32_t desc_set_used_mask;
@@ -189,6 +205,8 @@ struct radv_shader_info {
 		uint64_t outputs_written;
 		uint64_t patch_outputs_written;
 	} tcs;
+
+	struct radv_streamout_info so;
 };
 
 struct radv_userdata_info {
diff --git a/src/amd/vulkan/radv_shader_info.c b/src/amd/vulkan/radv_shader_info.c
index 29f5f68a32..f7888ec6a6 100644
--- a/src/amd/vulkan/radv_shader_info.c
+++ b/src/amd/vulkan/radv_shader_info.c
@@ -24,6 +24,7 @@
 #include "radv_shader.h"
 #include "nir/nir.h"
 #include "nir/nir_deref.h"
+#include "nir/nir_xfb_info.h"
 
 static void mark_sampler_desc(const nir_variable *var,
 			      struct radv_shader_info *info)
@@ -470,6 +471,39 @@ gather_info_output_decl(const nir_shader *nir, const nir_variable *var,
 	}
 }
 
+static void
+gather_xfb_info(const nir_shader *nir, struct radv_shader_info *info)
+{
+	nir_xfb_info *xfb = nir_gather_xfb_info(nir, NULL);
+	struct radv_streamout_info *so = &info->so;
+
+	if (!xfb)
+		return;
+
+	assert(xfb->output_count < MAX_SO_OUTPUTS);
+	so->num_outputs = xfb->output_count;
+
+	for (unsigned i = 0; i < xfb->output_count; i++) {
+		struct radv_stream_output *output = &so->outputs[i];
+
+		output->buffer = xfb->outputs[i].buffer;
+		output->stream = xfb->buffer_to_stream[xfb->outputs[i].buffer];
+		output->offset = xfb->outputs[i].offset;
+		output->location = xfb->outputs[i].location;
+		output->component_mask = xfb->outputs[i].component_mask;
+
+		so->enabled_stream_buffers_mask |=
+			(1 << output->buffer) << (output->stream * 4);
+
+	}
+
+	for (unsigned i = 0; i < NIR_MAX_XFB_BUFFERS; i++) {
+		so->strides[i] = xfb->strides[i] / 4;
+	}
+
+	ralloc_free(xfb);
+}
+
 void
 radv_nir_shader_info_pass(const struct nir_shader *nir,
 			  const struct radv_nir_compiler_options *options,
@@ -490,4 +524,9 @@ radv_nir_shader_info_pass(const struct nir_shader *nir,
 
 	nir_foreach_variable(variable, &nir->outputs)
 		gather_info_output_decl(nir, variable, info, options);
+
+	if (nir->info.stage == MESA_SHADER_VERTEX ||
+	    nir->info.stage == MESA_SHADER_TESS_EVAL ||
+	    nir->info.stage == MESA_SHADER_GEOMETRY)
+		gather_xfb_info(nir, info);
 }
-- 
2.19.1