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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 vec4 function(inout vec4 par); |
| 33 bool is_all(const in vec4 par, const in float value); |
| 34 void set_all(out vec4 par, const in float value); |
| 35 |
| 36 void main (void) |
| 37 { |
| 38 vec4 par = vec4(1.0, 1.0, 1.0, 1.0); |
| 39 vec4 ret = vec4(0.0, 0.0, 0.0, 0.0); |
| 40 |
| 41 float gray = 0.0; |
| 42 |
| 43 ret = function(par); |
| 44 |
| 45 // The parameter should be changed by the function and the function shou
ld return 1.0. |
| 46 if(is_all(par, 0.0) && is_all(ret, 1.0)) |
| 47 { |
| 48 gray = 1.0; |
| 49 } |
| 50 |
| 51 gl_FragColor = vec4(gray, gray, gray, 1.0); |
| 52 } |
| 53 |
| 54 // Function definition. |
| 55 vec4 function(inout vec4 par) |
| 56 { |
| 57 // Return the value of the parameter. |
| 58 if(is_all(par, 1.0)) |
| 59 { |
| 60 // Test parameter qualifier (default is "in"). |
| 61 set_all(par, 0.0); |
| 62 |
| 63 return vec4(1.0, 1.0, 1.0, 1.0); |
| 64 } |
| 65 else |
| 66 return vec4(0.0, 0.0, 0.0, 0.0); |
| 67 } |
| 68 |
| 69 bool is_all(const in vec4 par, const in float value) |
| 70 { |
| 71 bool ret = true; |
| 72 |
| 73 if(par[0] != value) |
| 74 ret = false; |
| 75 if(par[1] != value) |
| 76 ret = false; |
| 77 if(par[2] != value) |
| 78 ret = false; |
| 79 if(par[3] != value) |
| 80 ret = false; |
| 81 |
| 82 return ret; |
| 83 } |
| 84 |
| 85 void set_all(out vec4 par, const in float value) |
| 86 { |
| 87 par[0] = value; |
| 88 par[1] = value; |
| 89 par[2] = value; |
| 90 par[3] = value; |
| 91 } |
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