1 files changed, 19 insertions, 0 deletions
diff --git a/progs/glsl/reflect.vert b/progs/glsl/reflect.vert
new file mode 100644
index 00000000000..402be38bf7b
--- /dev/null
+++ b/progs/glsl/reflect.vert
@@ -0,0 +1,19 @@
+// Vertex shader for cube-texture reflection mapping
+// Brian Paul
+
+
+varying vec3 normal;
+
+void main() 
+{
+   vec3 n = gl_NormalMatrix * gl_Normal;
+   vec3 u = normalize(vec3(gl_ModelViewMatrix * gl_Vertex));
+   float two_n_dot_u = 2.0 * dot(n, u);
+   vec4 f;
+   f.xyz = u - n * two_n_dot_u;
+
+   // outputs
+   normal = n;
+   gl_TexCoord[0] = gl_TextureMatrix[0] * f;
+   gl_Position = ftransform();
+}