1 files changed, 25 insertions, 0 deletions
diff --git a/source/blender/gpu/shaders/material/gpu_shader_material_tangent.glsl b/source/blender/gpu/shaders/material/gpu_shader_material_tangent.glsl
new file mode 100644
index 00000000000..ff2dbc7ead3
--- /dev/null
+++ b/source/blender/gpu/shaders/material/gpu_shader_material_tangent.glsl
@@ -0,0 +1,25 @@
+void tangent_orco_x(vec3 orco_in, out vec3 orco_out)
+{
+  orco_out = orco_in.xzy * vec3(0.0, -0.5, 0.5) + vec3(0.0, 0.25, -0.25);
+}
+
+void tangent_orco_y(vec3 orco_in, out vec3 orco_out)
+{
+  orco_out = orco_in.zyx * vec3(-0.5, 0.0, 0.5) + vec3(0.25, 0.0, -0.25);
+}
+
+void tangent_orco_z(vec3 orco_in, out vec3 orco_out)
+{
+  orco_out = orco_in.yxz * vec3(-0.5, 0.5, 0.0) + vec3(0.25, -0.25, 0.0);
+}
+
+void node_tangentmap(vec4 attr_tangent, out vec3 tangent)
+{
+  tangent = normalize(attr_tangent.xyz);
+}
+
+void node_tangent(vec3 N, vec3 orco, mat4 objmat, out vec3 T)
+{
+  T = (objmat * vec4(orco, 0.0)).xyz;
+  T = cross(N, normalize(cross(T, N)));
+}