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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 attribute vec4 gtf_Vertex; |
| 27 uniform mat4 gtf_ModelViewProjectionMatrix; |
| 28 varying vec4 color; |
| 29 |
| 30 // Function declaration. |
| 31 int function(int par); |
| 32 |
| 33 void main (void) |
| 34 { |
| 35 int par = 1; |
| 36 int ret = 0; |
| 37 |
| 38 float gray = 0.0; |
| 39 |
| 40 ret = function(par); |
| 41 |
| 42 // The parameter should remain unchanged by the function and the functio
n should return 1. |
| 43 if((par == 1) && (ret == 1)) |
| 44 { |
| 45 gray = 1.0; |
| 46 } |
| 47 |
| 48 color = vec4(gray, gray, gray, 1.0); |
| 49 gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex; |
| 50 } |
| 51 |
| 52 // Function definition. |
| 53 int function(int par) |
| 54 { |
| 55 // Return the value of the parameter. |
| 56 if(par == 1) |
| 57 { |
| 58 // Test parameter qualifier (default is "in"). |
| 59 par = 0; |
| 60 |
| 61 return 1; |
| 62 } |
| 63 else |
| 64 return 0; |
| 65 } |
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