OpenSubdiv: Add OpenSubdiv files which are related on the CCGSubSurf and GPU

Those files are still not in use (SCons will tyr to compile new CCGSubSurf files
but no code will be in use at all because those new files are fully wrapped by
ifdef WITH_OPENSUBDIV check).

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) {