1 files changed, 53 insertions, 0 deletions
diff --git a/source/blender/gpu/gawain/vertex_format.h b/source/blender/gpu/gawain/vertex_format.h
new file mode 100644
index 00000000000..09c79603b0c
--- /dev/null
+++ b/source/blender/gpu/gawain/vertex_format.h
@@ -0,0 +1,53 @@
+
+// Gawain vertex format
+//
+// This code is part of the Gawain library, with modifications
+// specific to integration with Blender.
+//
+// Copyright 2016 Mike Erwin
+//
+// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of
+// the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+#pragma once
+
+#include "common.h"
+
+#define MAX_VERTEX_ATTRIBS 16
+#define AVG_VERTEX_ATTRIB_NAME_LEN 5
+#define VERTEX_ATTRIB_NAMES_BUFFER_LEN ((AVG_VERTEX_ATTRIB_NAME_LEN + 1) * MAX_VERTEX_ATTRIBS)
+
+typedef enum {
+	KEEP_FLOAT,
+	KEEP_INT,
+	NORMALIZE_INT_TO_FLOAT, // 127 (ubyte) -> 0.5 (and so on for other int types)
+	CONVERT_INT_TO_FLOAT // 127 (any int type) -> 127.0
+} VertexFetchMode;
+
+typedef struct {
+	GLenum comp_type;
+	unsigned comp_ct; // 1 to 4
+	unsigned sz; // size in bytes, 1 to 16
+	unsigned offset; // from beginning of vertex, in bytes
+	VertexFetchMode fetch_mode;
+	const char* name;
+} Attrib;
+
+typedef struct {
+	unsigned attrib_ct; // 0 to 16 (MAX_VERTEX_ATTRIBS)
+	unsigned stride; // stride in bytes, 1 to 256
+	bool packed;
+	Attrib attribs[MAX_VERTEX_ATTRIBS]; // TODO: variable-size attribs array
+	char names[VERTEX_ATTRIB_NAMES_BUFFER_LEN];
+	unsigned name_offset;
+} VertexFormat;
+
+void VertexFormat_clear(VertexFormat*);
+void VertexFormat_copy(VertexFormat* dest, const VertexFormat* src);
+
+unsigned add_attrib(VertexFormat*, const char* name, GLenum comp_type, unsigned comp_ct, VertexFetchMode);
+
+// for internal use
+void VertexFormat_pack(VertexFormat*);
+unsigned padding(unsigned offset, unsigned alignment);
+unsigned vertex_buffer_size(const VertexFormat*, unsigned vertex_ct);