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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 /* This epsilon will work as long as the magnitude of the float is < 128. |
| 32 * This can be seen by taking the spec relative mediump precision of 2^-10: |
| 33 * 0.125 / 2^-10 = 128 |
| 34 */ |
| 35 #define ERROR_EPSILON (0.125) |
| 36 |
| 37 void main (void) |
| 38 { |
| 39 mat4 a = mat4( 1.0, 2.0, 3.0, 4.0, |
| 40 5.0, 6.0, 7.0, 8.0, |
| 41 9.0, 10.0, 11.0, 12.0, |
| 42 13.0, 14.0, 15.0, 16.0); |
| 43 float gray,sum1=0.0,sum2=0.0,sum3=0.0,sum4=0.0; |
| 44 int i; |
| 45 |
| 46 |
| 47 sum1 += a[0][0]; |
| 48 sum2 += a[1][0]; |
| 49 sum3 += a[2][0]; |
| 50 sum4 += a[3][0]; |
| 51 |
| 52 sum1 += a[0][1]; |
| 53 sum2 += a[1][1]; |
| 54 sum3 += a[2][1]; |
| 55 sum4 += a[3][1]; |
| 56 |
| 57 sum1 += a[0][2]; |
| 58 sum2 += a[1][2]; |
| 59 sum3 += a[2][2]; |
| 60 sum4 += a[3][2]; |
| 61 |
| 62 sum1 += a[0][3]; |
| 63 sum2 += a[1][3]; |
| 64 sum3 += a[2][3]; |
| 65 sum4 += a[3][3]; |
| 66 |
| 67 if( ( sum1 > 10.0-ERROR_EPSILON && sum1 < 10.0+ERROR_EPSILON ) && |
| 68 ( sum2 > 26.0-ERROR_EPSILON && sum2 < 26.0+ERROR_EPSILON) && |
| 69 ( sum3 > 42.0-ERROR_EPSILON && sum3 < 42.0+ERROR_EPSILON) && |
| 70 ( sum4 > 58.0-ERROR_EPSILON && sum4 < 58.0+ERROR_EPSILON) ) |
| 71 gray=1.0; |
| 72 else gray=0.0; |
| 73 gl_FragColor = vec4(gray, gray, gray, 1.0); |
| 74 } |
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