nir: Add a pass for gathering transform feedback info

This is different from the GL_ARB_spirv pass because it generates a much
simpler data structure that isn't tied to OpenGL and mtypes.h.

Reviewed-by: Samuel Pitoiset <[email protected]>

1 files changed, 59 insertions, 0 deletions

diff --git a/src/compiler/nir/nir_xfb_info.h b/src/compiler/nir/nir_xfb_info.h
new file mode 100644
index 00000000000..9b543df5f47
--- /dev/null
+++ b/src/compiler/nir/nir_xfb_info.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright © 2018 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef NIR_XFB_INFO_H
+#define NIR_XFB_INFO_H
+
+#include "nir.h"
+
+#define NIR_MAX_XFB_BUFFERS 4
+#define NIR_MAX_XFB_STREAMS 4
+
+typedef struct {
+   uint8_t buffer;
+   uint16_t offset;
+   uint8_t location;
+   uint8_t component_mask;
+} nir_xfb_output_info;
+
+typedef struct {
+   uint8_t buffers_written;
+   uint8_t streams_written;
+
+   uint16_t strides[NIR_MAX_XFB_BUFFERS];
+   uint8_t buffer_to_stream[NIR_MAX_XFB_STREAMS];
+
+   uint16_t output_count;
+   nir_xfb_output_info outputs[0];
+} nir_xfb_info;
+
+static inline size_t
+nir_xfb_info_size(uint16_t output_count)
+{
+   return sizeof(nir_xfb_info) + sizeof(nir_xfb_output_info) * output_count;
+}
+
+nir_xfb_info *
+nir_gather_xfb_info(const nir_shader *shader, void *mem_ctx);
+
+#endif /* NIR_XFB_INFO_H */