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diff --git a/intern/gawain/gawain/shader_interface.h b/intern/gawain/gawain/shader_interface.h
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index 00000000000..bdb0bbf4a8c
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+++ b/intern/gawain/gawain/shader_interface.h
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+
+// Gawain shader interface (C --> GLSL)
+//
+// This code is part of the Gawain library, with modifications
+// specific to integration with Blender.
+//
+// Copyright 2017 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"
+
+typedef enum {
+	UNIFORM_NONE, // uninitialized/unknown
+
+	UNIFORM_MODELVIEW_3D,  // mat4 ModelViewMatrix
+	UNIFORM_PROJECTION_3D, // mat4 ProjectionMatrix
+	UNIFORM_MVP_3D,        // mat4 ModelViewProjectionMatrix
+	UNIFORM_NORMAL_3D,     // mat3 NormalMatrix
+	UNIFORM_INV_NORMAL_3D, // mat3 InverseNormalMatrix
+
+	UNIFORM_MODELVIEW_2D,  // mat3 ModelViewMatrix
+	UNIFORM_PROJECTION_2D, // mat3 ProjectionMatrix
+	UNIFORM_MVP_2D,        // mat3 ModelViewProjectionMatrix
+
+	UNIFORM_COLOR, // vec4 color
+
+	UNIFORM_CUSTOM // custom uniform, not one of the above built-ins
+} BuiltinUniform;
+
+typedef struct {
+	const char* name;
+	GLenum gl_type;
+	BuiltinUniform builtin_type; // only for uniform inputs
+	GLint size;
+	GLint location;
+} ShaderInput;
+
+typedef struct {
+	uint16_t uniform_ct;
+	uint16_t attrib_ct;
+	ShaderInput inputs[0]; // dynamic size, uniforms followed by attribs
+} ShaderInterface;
+
+ShaderInterface* ShaderInterface_create(GLint program_id);
+void ShaderInterface_discard(ShaderInterface*);