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| 1 |
| 2 /* |
| 3 ** Copyright (c) 2012 The Khronos Group Inc. |
| 4 ** |
| 5 ** Permission is hereby granted, free of charge, to any person obtaining a |
| 6 ** copy of this software and/or associated documentation files (the |
| 7 ** "Materials"), to deal in the Materials without restriction, including |
| 8 ** without limitation the rights to use, copy, modify, merge, publish, |
| 9 ** distribute, sublicense, and/or sell copies of the Materials, and to |
| 10 ** permit persons to whom the Materials are furnished to do so, subject to |
| 11 ** the following conditions: |
| 12 ** |
| 13 ** The above copyright notice and this permission notice shall be included |
| 14 ** in all copies or substantial portions of the Materials. |
| 15 ** |
| 16 ** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 17 ** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 18 ** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 19 ** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| 20 ** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| 21 ** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| 22 ** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS. |
| 23 */ |
| 24 |
| 25 |
| 26 /* The following files are direct copies of each other: |
| 27 * |
| 28 * GL/acos/acos_float_frag_xvary_ref.frag |
| 29 * GL/asin/asin_float_frag_xvary_ref.frag |
| 30 * |
| 31 * Care should be taken to apply any changes to both. Only the last |
| 32 * line where gl_FragColor is assigned should be different. |
| 33 */ |
| 34 |
| 35 #ifdef GL_ES |
| 36 precision mediump float; |
| 37 #endif |
| 38 varying vec4 color; |
| 39 |
| 40 float lerp(float a, float b, float s) |
| 41 { |
| 42 return a + (b - a) * s; |
| 43 } |
| 44 |
| 45 void main (void) |
| 46 { |
| 47 float asinValues[17]; |
| 48 asinValues[0] = -1.5708; |
| 49 asinValues[1] = -1.06544; |
| 50 asinValues[2] = -0.848062; |
| 51 asinValues[3] = -0.675132; |
| 52 asinValues[4] = -0.523599; |
| 53 asinValues[5] = -0.384397; |
| 54 asinValues[6] = -0.25268; |
| 55 asinValues[7] = -0.125328; |
| 56 asinValues[8] = 0.0; |
| 57 asinValues[9] = 0.125328; |
| 58 asinValues[10] = 0.25268; |
| 59 asinValues[11] = 0.384397; |
| 60 asinValues[12] = 0.523599; |
| 61 asinValues[13] = 0.675132; |
| 62 asinValues[14] = 0.848062; |
| 63 asinValues[15] = 1.06544; |
| 64 asinValues[16] = 1.5708; |
| 65 |
| 66 const float M_PI = 3.14159265358979323846; |
| 67 float c = 2.0 * (color.r - 0.5); |
| 68 |
| 69 float arrVal = (c + 1.0) * 8.0; |
| 70 int arr0 = int(floor(arrVal)); |
| 71 float weight = arrVal - floor(arrVal); |
| 72 float asin_c = 0.0; |
| 73 |
| 74 if (arr0 == 0) |
| 75 asin_c = lerp(asinValues[0], asinValues[1], weight); |
| 76 else if (arr0 == 1) |
| 77 asin_c = lerp(asinValues[1], asinValues[2], weight); |
| 78 else if (arr0 == 2) |
| 79 asin_c = lerp(asinValues[2], asinValues[3], weight); |
| 80 else if (arr0 == 3) |
| 81 asin_c = lerp(asinValues[3], asinValues[4], weight); |
| 82 else if (arr0 == 4) |
| 83 asin_c = lerp(asinValues[4], asinValues[5], weight); |
| 84 else if (arr0 == 5) |
| 85 asin_c = lerp(asinValues[5], asinValues[6], weight); |
| 86 else if (arr0 == 6) |
| 87 asin_c = lerp(asinValues[6], asinValues[7], weight); |
| 88 else if (arr0 == 7) |
| 89 asin_c = lerp(asinValues[7], asinValues[8], weight); |
| 90 else if (arr0 == 8) |
| 91 asin_c = lerp(asinValues[8], asinValues[9], weight); |
| 92 else if (arr0 == 9) |
| 93 asin_c = lerp(asinValues[9], asinValues[10], weight); |
| 94 else if (arr0 == 10) |
| 95 asin_c = lerp(asinValues[10], asinValues[11], weight); |
| 96 else if (arr0 == 11) |
| 97 asin_c = lerp(asinValues[11], asinValues[12], weight); |
| 98 else if (arr0 == 12) |
| 99 asin_c = lerp(asinValues[12], asinValues[13], weight); |
| 100 else if (arr0 == 13) |
| 101 asin_c = lerp(asinValues[13], asinValues[14], weight); |
| 102 else if (arr0 == 14) |
| 103 asin_c = lerp(asinValues[14], asinValues[15], weight); |
| 104 else if (arr0 == 15) |
| 105 asin_c = lerp(asinValues[15], asinValues[16], weight); |
| 106 else if (arr0 == 16) |
| 107 asin_c = asinValues[16]; |
| 108 |
| 109 // acos(x) = PI/2 - asin(x) |
| 110 gl_FragColor = vec4(0.5 - asin_c / M_PI, 0.0, 0.0, 1.0); |
| 111 } |
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