| |
| /* |
| ** 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. |
| */ |
| |
| |
| /* The following files are direct copies of each other: |
| * |
| * GL/acos/acos_float_frag_xvary_ref.frag |
| * GL/asin/asin_float_frag_xvary_ref.frag |
| * |
| * Care should be taken to apply any changes to both. Only the last |
| * line where gl_FragColor is assigned should be different. |
| */ |
| |
| #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 asinValues[17]; |
| asinValues[0] = -1.5708; |
| asinValues[1] = -1.06544; |
| asinValues[2] = -0.848062; |
| asinValues[3] = -0.675132; |
| asinValues[4] = -0.523599; |
| asinValues[5] = -0.384397; |
| asinValues[6] = -0.25268; |
| asinValues[7] = -0.125328; |
| asinValues[8] = 0.0; |
| asinValues[9] = 0.125328; |
| asinValues[10] = 0.25268; |
| asinValues[11] = 0.384397; |
| asinValues[12] = 0.523599; |
| asinValues[13] = 0.675132; |
| asinValues[14] = 0.848062; |
| asinValues[15] = 1.06544; |
| asinValues[16] = 1.5708; |
| |
| const float M_PI = 3.14159265358979323846; |
| float c = 2.0 * (color.r - 0.5); |
| |
| float arrVal = (c + 1.0) * 8.0; |
| int arr0 = int(floor(arrVal)); |
| float weight = arrVal - floor(arrVal); |
| float asin_c = 0.0; |
| |
| if (arr0 == 0) |
| asin_c = lerp(asinValues[0], asinValues[1], weight); |
| else if (arr0 == 1) |
| asin_c = lerp(asinValues[1], asinValues[2], weight); |
| else if (arr0 == 2) |
| asin_c = lerp(asinValues[2], asinValues[3], weight); |
| else if (arr0 == 3) |
| asin_c = lerp(asinValues[3], asinValues[4], weight); |
| else if (arr0 == 4) |
| asin_c = lerp(asinValues[4], asinValues[5], weight); |
| else if (arr0 == 5) |
| asin_c = lerp(asinValues[5], asinValues[6], weight); |
| else if (arr0 == 6) |
| asin_c = lerp(asinValues[6], asinValues[7], weight); |
| else if (arr0 == 7) |
| asin_c = lerp(asinValues[7], asinValues[8], weight); |
| else if (arr0 == 8) |
| asin_c = lerp(asinValues[8], asinValues[9], weight); |
| else if (arr0 == 9) |
| asin_c = lerp(asinValues[9], asinValues[10], weight); |
| else if (arr0 == 10) |
| asin_c = lerp(asinValues[10], asinValues[11], weight); |
| else if (arr0 == 11) |
| asin_c = lerp(asinValues[11], asinValues[12], weight); |
| else if (arr0 == 12) |
| asin_c = lerp(asinValues[12], asinValues[13], weight); |
| else if (arr0 == 13) |
| asin_c = lerp(asinValues[13], asinValues[14], weight); |
| else if (arr0 == 14) |
| asin_c = lerp(asinValues[14], asinValues[15], weight); |
| else if (arr0 == 15) |
| asin_c = lerp(asinValues[15], asinValues[16], weight); |
| else if (arr0 == 16) |
| asin_c = asinValues[16]; |
| |
| gl_FragColor = vec4(asin_c / M_PI + 0.5, 0.0, 0.0, 1.0); |
| } |