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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 #define ERROR_EPSILON 0.1 |
| 31 |
| 32 void main (void) |
| 33 { |
| 34 vec4 L1 = vec4(1.0, 2.0, 3.0, 4.0); |
| 35 vec4 L2 = vec4(5.0, 6.0, 7.0, 8.0); |
| 36 vec4 L3 = vec4(9.0, 10.0, 11.0, 12.0); |
| 37 vec4 L4 = vec4(13.0, 14.0, 15.0, 16.0); |
| 38 |
| 39 mat4 a = mat4(L1,L2,L3,L4); |
| 40 |
| 41 float gray,sum1=0.0,sum2=0.0,sum3=0.0,sum4=0.0; |
| 42 int i; |
| 43 |
| 44 sum1 = sum1 + a[0][0]; |
| 45 sum2 = sum2 + a[1][0]; |
| 46 sum3 = sum3 + a[2][0]; |
| 47 sum4 = sum4 + a[3][0]; |
| 48 |
| 49 sum1 = sum1 + a[0][1]; |
| 50 sum2 = sum2 + a[1][1]; |
| 51 sum3 = sum3 + a[2][1]; |
| 52 sum4 = sum4 + a[3][1]; |
| 53 |
| 54 sum1 = sum1 + a[0][2]; |
| 55 sum2 = sum2 + a[1][2]; |
| 56 sum3 = sum3 + a[2][2]; |
| 57 sum4 = sum4 + a[3][2]; |
| 58 |
| 59 sum1 = sum1 + a[0][3]; |
| 60 sum2 = sum2 + a[1][3]; |
| 61 sum3 = sum3 + a[2][3]; |
| 62 sum4 = sum4 + a[3][3]; |
| 63 |
| 64 if( ( sum1 > 10.0-ERROR_EPSILON && sum1 < 10.0+ERROR_EPSILON ) && |
| 65 ( sum2 > 26.0-ERROR_EPSILON && sum2 < 26.0+ERROR_EPSILON) && |
| 66 ( sum3 > 42.0-ERROR_EPSILON && sum3 < 42.0+ERROR_EPSILON) && |
| 67 ( sum4 > 58.0-ERROR_EPSILON && sum4 < 58.0+ERROR_EPSILON) ) |
| 68 gray=1.0; |
| 69 else gray=0.0; |
| 70 color = vec4(gray, gray, gray, 1.0); |
| 71 gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex; |
| 72 } |
| 73 |
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