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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 #ifdef GL_ES |
| 27 precision mediump float; |
| 28 #endif |
| 29 varying vec4 color; |
| 30 |
| 31 // Function declaration. |
| 32 mat4 function(in mat4 par); |
| 33 bool is_all(const in mat4 par, const in float value); |
| 34 void set_all(out mat4 par, const in float value); |
| 35 |
| 36 void main (void) |
| 37 { |
| 38 mat4 par = mat4(1.0, 1.0, 1.0, 1.0, |
| 39 1.0, 1.0, 1.0, 1.0, |
| 40 1.0, 1.0, 1.0, 1.0, |
| 41 1.0, 1.0, 1.0, 1.0); |
| 42 mat4 ret = mat4(0.0, 0.0, 0.0, 0.0, |
| 43 0.0, 0.0, 0.0, 0.0, |
| 44 0.0, 0.0, 0.0, 0.0, |
| 45 0.0, 0.0, 0.0, 0.0); |
| 46 |
| 47 float gray = 0.0; |
| 48 |
| 49 ret = function(par); |
| 50 |
| 51 // The parameter should remain unchanged by the function and the functio
n should return 1.0. |
| 52 if(is_all(par, 1.0) && is_all(ret, 1.0)) |
| 53 { |
| 54 gray = 1.0; |
| 55 } |
| 56 |
| 57 gl_FragColor = vec4(gray, gray, gray, 1.0); |
| 58 } |
| 59 |
| 60 // Function definition. |
| 61 mat4 function(in mat4 par) |
| 62 { |
| 63 // Return the value of the parameter. |
| 64 if(is_all(par, 1.0)) |
| 65 { |
| 66 // Test parameter qualifier (default is "in"). |
| 67 set_all(par, 0.0); |
| 68 |
| 69 return mat4(1.0, 1.0, 1.0, 1.0, |
| 70 1.0, 1.0, 1.0, 1.0, |
| 71 1.0, 1.0, 1.0, 1.0, |
| 72 1.0, 1.0, 1.0, 1.0); |
| 73 } |
| 74 else |
| 75 return mat4(0.0, 0.0, 0.0, 0.0, |
| 76 0.0, 0.0, 0.0, 0.0, |
| 77 0.0, 0.0, 0.0, 0.0, |
| 78 0.0, 0.0, 0.0, 0.0); |
| 79 } |
| 80 |
| 81 bool is_all(const in mat4 par, const in float value) |
| 82 { |
| 83 bool ret = true; |
| 84 |
| 85 if(par[0][0] != value) |
| 86 ret = false; |
| 87 if(par[0][1] != value) |
| 88 ret = false; |
| 89 if(par[0][2] != value) |
| 90 ret = false; |
| 91 if(par[0][3] != value) |
| 92 ret = false; |
| 93 |
| 94 if(par[1][0] != value) |
| 95 ret = false; |
| 96 if(par[1][1] != value) |
| 97 ret = false; |
| 98 if(par[1][2] != value) |
| 99 ret = false; |
| 100 if(par[1][3] != value) |
| 101 ret = false; |
| 102 |
| 103 if(par[2][0] != value) |
| 104 ret = false; |
| 105 if(par[2][1] != value) |
| 106 ret = false; |
| 107 if(par[2][2] != value) |
| 108 ret = false; |
| 109 if(par[2][3] != value) |
| 110 ret = false; |
| 111 |
| 112 if(par[3][0] != value) |
| 113 ret = false; |
| 114 if(par[3][1] != value) |
| 115 ret = false; |
| 116 if(par[3][2] != value) |
| 117 ret = false; |
| 118 if(par[3][3] != value) |
| 119 ret = false; |
| 120 |
| 121 return ret; |
| 122 } |
| 123 |
| 124 void set_all(out mat4 par, const in float value) |
| 125 { |
| 126 par[0][0] = value; |
| 127 par[0][1] = value; |
| 128 par[0][2] = value; |
| 129 par[0][3] = value; |
| 130 |
| 131 par[1][0] = value; |
| 132 par[1][1] = value; |
| 133 par[1][2] = value; |
| 134 par[1][3] = value; |
| 135 |
| 136 par[2][0] = value; |
| 137 par[2][1] = value; |
| 138 par[2][2] = value; |
| 139 par[2][3] = value; |
| 140 |
| 141 par[3][0] = value; |
| 142 par[3][1] = value; |
| 143 par[3][2] = value; |
| 144 par[3][3] = value; |
| 145 } |
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