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diff --git a/intern/gawain/gawain/gwn_shader_interface.h b/intern/gawain/gawain/gwn_shader_interface.h
new file mode 100644
index 00000000000..cb3aeb84239
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+++ b/intern/gawain/gawain/gwn_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 "gwn_common.h"
+
+typedef enum {
+	GWN_UNIFORM_NONE, // uninitialized/unknown
+
+	GWN_UNIFORM_MODELVIEW,  // mat4 ModelViewMatrix
+	GWN_UNIFORM_PROJECTION, // mat4 ProjectionMatrix
+	GWN_UNIFORM_MVP,        // mat4 ModelViewProjectionMatrix
+
+	GWN_UNIFORM_MODELVIEW_INV,  // mat4 ModelViewInverseMatrix
+	GWN_UNIFORM_PROJECTION_INV, // mat4 ProjectionInverseMatrix
+
+	GWN_UNIFORM_NORMAL,     // mat3 NormalMatrix
+
+	GWN_UNIFORM_COLOR, // vec4 color
+
+	GWN_UNIFORM_CUSTOM // custom uniform, not one of the above built-ins
+} Gwn_UniformBuiltin;
+
+typedef struct Gwn_ShaderInput {
+	const char* name;
+	unsigned name_hash;
+	GLenum gl_type;
+	Gwn_UniformBuiltin builtin_type; // only for uniform inputs
+	GLint size;
+	GLint location;
+} Gwn_ShaderInput;
+
+typedef struct Gwn_ShaderInterface {
+	uint16_t uniform_ct;
+	uint16_t attrib_ct;
+	Gwn_ShaderInput inputs[0]; // dynamic size, uniforms followed by attribs
+} Gwn_ShaderInterface;
+
+Gwn_ShaderInterface* GWN_shaderinterface_create(GLint program_id);
+void GWN_shaderinterface_discard(Gwn_ShaderInterface*);
+
+const Gwn_ShaderInput* GWN_shaderinterface_uniform(const Gwn_ShaderInterface*, const char* name);
+const Gwn_ShaderInput* GWN_shaderinterface_uniform_builtin(const Gwn_ShaderInterface*, Gwn_UniformBuiltin);
+const Gwn_ShaderInput* GWN_shaderinterface_attr(const Gwn_ShaderInterface*, const char* name);