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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 |
| 30 /* This epsilon will work as long as the magnitude of the float is < 128. |
| 31 * This can be seen by taking the spec relative mediump precision of 2^-10: |
| 32 * 0.125 / 2^-10 = 128 |
| 33 */ |
| 34 #define ERROR_EPSILON (0.125) |
| 35 |
| 36 void main (void) |
| 37 { |
| 38 float x; |
| 39 // Declare a constant 2 by 2 matrix with unique elements. |
| 40 const mat2 a = mat2(1.0, 2.0, // 1.0 4.0 |
| 41 4.0, 8.0); // 2.0 8.0 |
| 42 |
| 43 // Copy the constant matrix to another non-const matrix. |
| 44 mat2 b = a; |
| 45 |
| 46 // Check each element of the copy. |
| 47 bool elms = true; |
| 48 if(b[0][0] != 1.0) elms = false; |
| 49 if(b[0][1] != 2.0) elms = false; |
| 50 if(b[1][0] != 4.0) elms = false; |
| 51 if(b[1][1] != 8.0) elms = false; |
| 52 |
| 53 // Add up each row of the copy. |
| 54 bool rows = true; |
| 55 x = b[0][0] + b[1][0]; |
| 56 if(x < 5.0-ERROR_EPSILON || x > 5.0+ERROR_EPSILON) rows = false; |
| 57 x = b[0][1] + b[1][1]; |
| 58 if(x < 10.0-ERROR_EPSILON || x > 10.0+ERROR_EPSILON) rows = false; |
| 59 |
| 60 // Add up each column of the copy. |
| 61 bool cols = true; |
| 62 x = b[0][0] + b[0][1]; |
| 63 if(x < 3.0-ERROR_EPSILON || x > 3.0+ERROR_EPSILON) cols = false; |
| 64 x = b[1][0] + b[1][1]; |
| 65 if(x < 12.0-ERROR_EPSILON || x > 12.0+ERROR_EPSILON) cols = false; |
| 66 |
| 67 // Check if all of the operations were successful. |
| 68 float gray = elms && rows && cols ? 1.0 : 0.0; |
| 69 |
| 70 // Assign the fragment color. |
| 71 gl_FragColor = vec4(gray, gray, gray, 1.0); |
| 72 } |
| 73 |
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