1 files changed, 87 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..66477b0cfc7
--- /dev/null
+++ b/source/blender/gpu/gawain/vertex_format.h
@@ -0,0 +1,87 @@
+
+// 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)
+
+#define USE_10_10_10 defined(_WIN32)
+// (GLEW_VERSION_3_3 || GLEW_ARB_vertex_type_2_10_10_10_rev)
+//   ^-- this is only guaranteed on Windows right now, will be true on all platforms soon
+
+typedef enum {
+	COMP_I8 = GL_BYTE,
+	COMP_U8 = GL_UNSIGNED_BYTE,
+	COMP_I16 = GL_SHORT,
+	COMP_U16 = GL_UNSIGNED_SHORT,
+	COMP_I32 = GL_INT,
+	COMP_U32 = GL_UNSIGNED_INT,
+
+	COMP_F32 = GL_FLOAT, // TODO: drop the GL_ equivalence here, use a private lookup table
+
+#if USE_10_10_10
+	COMP_I10 = GL_INT_2_10_10_10_REV
+#endif
+} VertexCompType;
+
+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 {
+	VertexCompType 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, VertexCompType, unsigned comp_ct, VertexFetchMode);
+
+// format conversion
+
+#if USE_10_10_10
+
+typedef struct {
+	int x : 10;
+	int y : 10;
+	int z : 10;
+	int w : 2;	// ignored for our purposes
+} PackedNormal;
+
+PackedNormal convert_i10_v3(const float data[3]);
+
+#endif // USE_10_10_10
+
+// for internal use
+void VertexFormat_pack(VertexFormat*);
+unsigned padding(unsigned offset, unsigned alignment);
+unsigned vertex_buffer_size(const VertexFormat*, unsigned vertex_ct);