1 files changed, 57 insertions, 0 deletions
diff --git a/src/GLSLShaderTest/dimple.frag b/src/GLSLShaderTest/dimple.frag
new file mode 100644
index 0000000..70d2982
--- /dev/null
+++ b/src/GLSLShaderTest/dimple.frag
@@ -0,0 +1,57 @@
+
+//
+// dimple.frag: Fragment shader for bump mapping dimples (bumps)
+//
+// author: John Kessenich
+//
+// Copyright (c) 2002: 3Dlabs, Inc.
+//
+//
+varying vec3 LightDir;
+varying vec3 EyeDir;
+varying vec3 Normal;
+
+const vec3 color = vec3(0.7, 0.6, 0.18);
+
+//const float Density = 16.0;
+//const float Size = 0.25;
+
+//uniform float Density;
+//uniform float Size;
+float Density = 27.6;
+float Size = 0.13025;
+
+
+//uniform float Scale;
+
+const float SpecularFactor = 0.5;
+
+void main (void)
+{
+    vec3 litColor;
+
+    vec2 c = Density * (gl_TexCoord[0].xy);
+    vec2 p = fract(c) - vec2(0.5);
+    float d = (p.x * p.x) + (p.y * p.y);
+    if (d >= Size)
+        p = vec2(0.0);
+
+    vec3 normDelta = vec3(-p.x, -p.y, 1.0);
+      
+    litColor = color * max(0.0, dot(normDelta, LightDir));
+      
+    float t = 2.0 * dot(LightDir, normDelta);
+    vec3 reflectDir = t * normDelta;
+    reflectDir = LightDir - reflectDir;
+    
+//    vec3 reflectDir = LightDir - 2.0 * dot(LightDir, normDelta) * normDelta;
+    
+    float spec = max(dot(EyeDir, reflectDir), 0.0);
+    spec = spec * spec;
+    spec = spec * spec;
+    spec *= SpecularFactor;
+
+    litColor = min(litColor + spec, vec3(1.0));
+    gl_FragColor = vec4(litColor, 1.0);
+//    gl_FragColor = vec4(Scale);
+}