Add ToT WebGL conformance tests : part 9

conformance/ogles/GL2FixedTests/lighting_diffuse/lighting_diffuse.vert

+
+/*
+** Copyright (c) 2012 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be included
+** in all copies or substantial portions of the Materials.
+**
+** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+
+uniform mat4 gtf_ModelViewMatrix;
+uniform mat4 gtf_ModelViewProjectionMatrix;
+uniform mat3 gtf_NormalMatrix;
+
+attribute vec4 gtf_Vertex;
+attribute vec4 gtf_Color;
+attribute vec3 gtf_Normal;
+
+varying vec4 color;
+
+vec4 Ambient;
+vec4 Diffuse;
+vec4 Specular;
+
+const vec3 lightPosition = vec3(0.0, 0.0, 10.0);
+const float lightAttenuationConstant = 1.0;
+const float lightAttenuationLinear = 0.0;
+const float lightAttenuationQuadratic = 0.0;
+
+const vec4 lightAmbient = vec4(0.0, 0.0, 0.0, 0.0);
+vec4 lightDiffuse = vec4(1.0, 0.0, 0.0, 1.0);
+
+const vec4 materialAmbient = vec4(0.0, 0.0, 0.0, 1.0);
+const vec4 materialDiffuse = vec4(1.0, 1.0, 1.0, 1.0);
+const vec4 materialSpecular = vec4(0.0, 0.0, 0.0, 0.0);
+const float materialShininess = 20.0;
+
+const vec4 sceneColor = vec4(0.0, 0.0, 0.0, 0.0);
+
+
+void pointLight(in int i, in vec3 normal, in vec3 eye, in vec3 ecPosition3)
+{
+   float nDotVP;       // normal . light direction
+   float nDotHV;       // normal . light half vector
+   float pf;           // power factor
+   float attenuation;  // computed attenuation factor
+   float d;            // distance from surface to light source
+   vec3  VP;           // direction from surface to light position
+   vec3  halfVector;   // direction of maximum highlights
+
+   // Compute vector from surface to light position
+   VP = lightPosition - ecPosition3;
+
+   // Compute distance between surface and light position
+   d = length(VP);
+
+   // Normalize the vector from surface to light position
+   VP = normalize(VP);
+
+   // Compute attenuation
+   attenuation = 1.0 / (lightAttenuationConstant +
+       lightAttenuationLinear * d +
+       lightAttenuationQuadratic * d * d);
+
+   halfVector = normalize(VP + eye);
+
+   nDotVP = max(0.0, dot(normal, VP));
+   nDotHV = max(0.0, dot(normal, halfVector));
+
+   if (nDotVP == 0.0)
+   {
+       pf = 0.0;
+   }
+   else
+   {
+       pf = pow(nDotHV, materialShininess);
+
+   }
+   Ambient  += lightAmbient * attenuation;
+   Diffuse  += lightDiffuse * nDotVP * attenuation;
+//   Specular += lightSpecular * pf * attenuation;
+}
+
+vec3 fnormal(void)
+{
+    //Compute the normal 
+    vec3 normal = gtf_Normal * gtf_NormalMatrix;
+    normal = normalize(normal);
+        
+        // This should change to "return normal" but for this test, we force a normal pointing towards the light
+        // return normal
+    return vec3(0.0, 0.0, 1.0);
+}
+
+void flight(in vec3 normal, in vec4 ecPosition, float alphaFade)
+{
+    vec3 ecPosition3;
+    vec3 eye;
+
+    ecPosition3 = (vec3 (ecPosition)) / ecPosition.w;
+    eye = vec3 (0.0, 0.0, 1.0);
+
+    // Clear the light intensity accumulators
+    Ambient  = vec4 (0.0);
+    Diffuse  = vec4 (0.0);
+    Specular = vec4 (0.0);
+        
+        lightDiffuse = gtf_Color;
+
+    pointLight(0, normal, eye, ecPosition3);
+
+    color = sceneColor +
+      Ambient  * materialAmbient +
+      Diffuse  * materialDiffuse;
+    color += Specular * materialSpecular;
+    color = clamp( color, 0.0, 1.0 );
+
+    color.a *= alphaFade;
+}
+
+
+void main (void)
+{
+    vec3  transformedNormal;
+    float alphaFade = 1.0;
+
+    // Eye-coordinate position of vertex, needed in various calculations
+    vec4 ecPosition = gtf_ModelViewMatrix * gtf_Vertex;
+
+    // Do fixed functionality vertex transform
+    gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
+    transformedNormal = fnormal();
+    flight(transformedNormal, ecPosition, alphaFade);
+}