Add ToT WebGL conformance tests : part 9

conformance/ogles/GL/refract/refract_vec2_vert_ivarynconst_ref.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.
+*/
+
+
+attribute vec4 gtf_Color;
+attribute vec4 gtf_Vertex;
+uniform mat4 gtf_ModelViewProjectionMatrix;
+varying vec4 color;
+
+void main (void)
+{
+        const float M_PI = 3.14159265358979323846;
+
+        // Both are unit vectors
+        vec2 v1;
+        vec2 v2 = normalize(vec2(1.0, 1.0));
+
+        float theta = gtf_Color.g * 2.0 * M_PI;
+        float phi = gtf_Color.b * 2.0 * M_PI;
+        v1.x = cos(theta) * sin(phi);
+        v1.y = sin(theta) * sin(phi);
+
+        vec2 result;
+        float eta = 0.5;
+        float k = 1.0 - eta * eta * (1.0 - dot(v1, v2) * dot(v1, v2));
+        if(k < 0.0)
+                result = vec2(0.0);
+        else
+                result = eta * v1 - (eta * dot(v1, v2) + sqrt(k)) * v2;
+
+        color = vec4((result + 1.0) / 2.0, 0.0, 1.0);
+        gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
+}