| |
| /* |
| ** 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); |
| |
| color = vec4((v1 - 2.0 * dot(v2, v1) * v2 + 1.0) / 2.0, 0.0, 1.0); |
| gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex; |
| } |