| |
| /* |
| ** 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. |
| */ |
| |
| |
| #ifdef GL_ES |
| precision mediump float; |
| #endif |
| varying vec4 color; |
| |
| float lerp(float a, float b, float s) |
| { |
| return a + (b - a) * s; |
| } |
| |
| void main (void) |
| { |
| float sinValues[17]; |
| sinValues[0] = 0.0; |
| sinValues[1] = 0.382683; |
| sinValues[2] = 0.707107; |
| sinValues[3] = 0.92388; |
| sinValues[4] = 1.0; |
| sinValues[5] = 0.92388; |
| sinValues[6] = 0.707107; |
| sinValues[7] = 0.382683; |
| sinValues[8] = 0.0; |
| sinValues[9] = -0.382683; |
| sinValues[10] = -0.707107; |
| sinValues[11] = -0.92388; |
| sinValues[12] = -1.0; |
| sinValues[13] = -0.923879; |
| sinValues[14] = -0.707107; |
| sinValues[15] = -0.382683; |
| sinValues[16] = 0.0; |
| |
| const float M_PI = 3.14159265358979323846; |
| float c = 2.0 * M_PI * color.r; |
| |
| float arrVal = c * 2.546478971; |
| int arr0 = int(floor(arrVal)); |
| float weight = arrVal - floor(arrVal); |
| float sin_c = 0.0; |
| |
| if (arr0 == 0) |
| sin_c = lerp(sinValues[0], sinValues[1], weight); |
| else if (arr0 == 1) |
| sin_c = lerp(sinValues[1], sinValues[2], weight); |
| else if (arr0 == 2) |
| sin_c = lerp(sinValues[2], sinValues[3], weight); |
| else if (arr0 == 3) |
| sin_c = lerp(sinValues[3], sinValues[4], weight); |
| else if (arr0 == 4) |
| sin_c = lerp(sinValues[4], sinValues[5], weight); |
| else if (arr0 == 5) |
| sin_c = lerp(sinValues[5], sinValues[6], weight); |
| else if (arr0 == 6) |
| sin_c = lerp(sinValues[6], sinValues[7], weight); |
| else if (arr0 == 7) |
| sin_c = lerp(sinValues[7], sinValues[8], weight); |
| else if (arr0 == 8) |
| sin_c = lerp(sinValues[8], sinValues[9], weight); |
| else if (arr0 == 9) |
| sin_c = lerp(sinValues[9], sinValues[10], weight); |
| else if (arr0 == 10) |
| sin_c = lerp(sinValues[10], sinValues[11], weight); |
| else if (arr0 == 11) |
| sin_c = lerp(sinValues[11], sinValues[12], weight); |
| else if (arr0 == 12) |
| sin_c = lerp(sinValues[12], sinValues[13], weight); |
| else if (arr0 == 13) |
| sin_c = lerp(sinValues[13], sinValues[14], weight); |
| else if (arr0 == 14) |
| sin_c = lerp(sinValues[14], sinValues[15], weight); |
| else if (arr0 == 15) |
| sin_c = lerp(sinValues[15], sinValues[16], weight); |
| else if (arr0 == 16) |
| sin_c = sinValues[16]; |
| |
| gl_FragColor = vec4(0.5 * sin_c + 0.5, 0.0, 0.0, 1.0); |
| } |