1 files changed, 98 insertions, 0 deletions
diff --git a/src/GLSLShaderTest/phong.frag b/src/GLSLShaderTest/phong.frag
new file mode 100644
index 0000000..c9e4365
--- /dev/null
+++ b/src/GLSLShaderTest/phong.frag
@@ -0,0 +1,98 @@
+/*
+ * $RCSfile$
+ *
+ * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in
+ *   the documentation and/or other materials provided with the
+ *   distribution.
+ *
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * This software is provided "AS IS," without a warranty of any
+ * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
+ * EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
+ * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
+ * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
+ * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
+ * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ *
+ * You acknowledge that this software is not designed, licensed or
+ * intended for use in the design, construction, operation or
+ * maintenance of any nuclear facility.
+ *
+ * $Revision$
+ * $Date$
+ * $State$
+ */
+
+// A GLSL fragment program for handling 1 directional light with specular.
+// This implements per-pixel lighting (Phong shading)
+
+void directionalLight0(
+    in    vec3 normal,
+    inout vec4 ambient,
+    inout vec4 diffuse,
+    inout vec4 specular)
+{
+    // Normalized light direction and half vector
+    vec3 lightDirection = normalize(vec3(gl_LightSource[0].position));
+    vec3 halfVector = normalize(vec3(gl_LightSource[0].halfVector));
+
+    float nDotVP; // normal . light_direction
+    float nDotHV; // normal . light_half_vector
+    float pf; // power factor
+
+    nDotVP = max(0.0, dot(normal, lightDirection));
+    nDotHV = max(0.0, dot(normal, halfVector));
+
+    if (nDotVP == 0.0) {
+	pf = 0.0;
+    }
+    else {
+	pf = pow(nDotHV, gl_FrontMaterial.shininess);
+    }
+
+    ambient += gl_LightSource[0].ambient;
+    diffuse += gl_LightSource[0].diffuse * nDotVP;
+    specular += gl_LightSource[0].specular * pf;
+}
+
+
+// Per-pixel normal (input from vertex shader)
+varying vec3  Normal;
+
+void main()
+{
+    vec3 unitNorm = normalize(Normal);
+    vec4 amb = vec4(0.0);
+    vec4 diff = vec4(0.0);
+    vec4 spec = vec4(0.0);
+    int i;
+
+    directionalLight0(unitNorm, amb, diff, spec);
+
+    // Apply the result of the lighting equation
+    vec4 secondaryColor = vec4(vec3(spec * gl_FrontMaterial.specular), 1.0);
+    vec4 color = vec4(vec3(gl_FrontLightModelProduct.sceneColor +
+		       amb * gl_FrontMaterial.ambient +
+		       diff * gl_FrontMaterial.diffuse), 1.0);
+
+    gl_FragColor = color + secondaryColor;
+}