1 files changed, 100 insertions, 0 deletions
diff --git a/source/blender/gpu/shaders/gpu_shader_geometry.glsl b/source/blender/gpu/shaders/gpu_shader_geometry.glsl
new file mode 100644
index 00000000000..a0ae96a1f72
--- /dev/null
+++ b/source/blender/gpu/shaders/gpu_shader_geometry.glsl
@@ -0,0 +1,100 @@
+uniform int PrimitiveIdBase;
+uniform int osd_active_uv_offset;
+
+varying vec3 varnormal;
+varying vec3 varposition;
+
+in block {
+	VertexData v;
+} inpt[4];
+
+uniform bool osd_flat_shading;
+uniform int osd_fvar_count;
+
+#define INTERP_FACE_VARYING_2(result, fvarOffset, tessCoord)  \
+	{ \
+		vec2 v[4]; \
+		int primOffset = (gl_PrimitiveID + PrimitiveIdBase) * 4; \
+		for (int i = 0; i < 4; ++i) { \
+			int index = (primOffset + i) * osd_fvar_count + fvarOffset; \
+			v[i] = vec2(texelFetch(FVarDataBuffer, index).s, \
+			            texelFetch(FVarDataBuffer, index + 1).s); \
+		} \
+		result = mix(mix(v[0], v[1], tessCoord.s), \
+		             mix(v[3], v[2], tessCoord.s), \
+		             tessCoord.t); \
+	}
+
+uniform samplerBuffer FVarDataBuffer;
+
+out block {
+	VertexData v;
+} outpt;
+
+void set_mtface_vertex_attrs(vec2 st);
+
+void emit_flat(int index, vec3 normal)
+{
+	outpt.v.position = inpt[index].v.position;
+	outpt.v.normal = normal;
+
+	/* Compatibility */
+	varnormal = outpt.v.normal;
+	varposition = outpt.v.position.xyz;
+
+	/* TODO(sergey): Only uniform subdivisions atm. */
+	vec2 quadst[4] = vec2[](vec2(0,0), vec2(1,0), vec2(1,1), vec2(0,1));
+	vec2 st = quadst[index];
+
+	INTERP_FACE_VARYING_2(outpt.v.uv, osd_active_uv_offset, st);
+
+	set_mtface_vertex_attrs(st);
+
+	gl_Position = gl_ProjectionMatrix * inpt[index].v.position;
+	EmitVertex();
+}
+
+void emit_smooth(int index)
+{
+	outpt.v.position = inpt[index].v.position;
+	outpt.v.normal = inpt[index].v.normal;
+
+	/* Compatibility */
+	varnormal = outpt.v.normal;
+	varposition = outpt.v.position.xyz;
+
+	/* TODO(sergey): Only uniform subdivisions atm. */
+	vec2 quadst[4] = vec2[](vec2(0,0), vec2(1,0), vec2(1,1), vec2(0,1));
+	vec2 st = quadst[index];
+
+	INTERP_FACE_VARYING_2(outpt.v.uv, osd_active_uv_offset, st);
+
+	set_mtface_vertex_attrs(st);
+
+	gl_Position = gl_ProjectionMatrix * inpt[index].v.position;
+	EmitVertex();
+}
+
+void main()
+{
+	gl_PrimitiveID = gl_PrimitiveIDIn;
+
+	if (osd_flat_shading) {
+		vec3 A = (inpt[0].v.position - inpt[1].v.position).xyz;
+		vec3 B = (inpt[3].v.position - inpt[1].v.position).xyz;
+		vec3 flat_normal = normalize(cross(B, A));
+		emit_flat(0, flat_normal);
+		emit_flat(1, flat_normal);
+		emit_flat(3, flat_normal);
+		emit_flat(2, flat_normal);
+	}
+	else {
+		emit_smooth(0);
+		emit_smooth(1);
+		emit_smooth(3);
+		emit_smooth(2);
+	}
+	EndPrimitive();
+}
+
+void set_mtface_vertex_attrs(vec2 st) {