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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 float x; |
| 35 // Declare a 3 by 3 matrix with unique elements. |
| 36 mat3 a = mat3( 1.0, 2.0, 4.0, // 1.0 8.0 64.0 |
| 37 8.0, 16.0, 32.0, // 2.0 16.0 128.0 |
| 38 64.0, 128.0, 256.0); // 4.0 32.0 256.0 |
| 39 |
| 40 // Copy the matrix to another non-const matrix. |
| 41 mat3 b = a; |
| 42 |
| 43 // Check each element of the copy. |
| 44 bool elms = true; |
| 45 if(b[0][0] != 1.0) elms = false; |
| 46 if(b[0][1] != 2.0) elms = false; |
| 47 if(b[0][2] != 4.0) elms = false; |
| 48 if(b[1][0] != 8.0) elms = false; |
| 49 if(b[1][1] != 16.0) elms = false; |
| 50 if(b[1][2] != 32.0) elms = false; |
| 51 if(b[2][0] != 64.0) elms = false; |
| 52 if(b[2][1] != 128.0) elms = false; |
| 53 if(b[2][2] != 256.0) elms = false; |
| 54 |
| 55 // Add up each row of the copy. |
| 56 bool rows = true; |
| 57 x = b[0][0] + b[1][0] + b[2][0]; |
| 58 if( x < 73.0-ERROR_EPSILON || x > 73.0+ERROR_EPSILON ) rows = false; |
| 59 x = b[0][1] + b[1][1] + b[2][1]; |
| 60 if(x < 146.0-ERROR_EPSILON || x > 146.0+ERROR_EPSILON ) rows = false; |
| 61 x = b[0][2] + b[1][2] + b[2][2]; |
| 62 if(x < 292.0-ERROR_EPSILON || x > 292.0+ERROR_EPSILON ) rows = false; |
| 63 |
| 64 // Add up each column of the copy. |
| 65 bool cols = true; |
| 66 x = b[0][0] + b[0][1] + b[0][2]; |
| 67 if( x < 7.0-ERROR_EPSILON || x > 7.0+ERROR_EPSILON ) cols = false; |
| 68 x = b[1][0] + b[1][1] + b[1][2]; |
| 69 if(x < 56.0-ERROR_EPSILON || x > 56.0+ERROR_EPSILON) cols = false; |
| 70 x = b[2][0] + b[2][1] + b[2][2]; |
| 71 if(x < 448.0-ERROR_EPSILON || x > 448.0+ERROR_EPSILON) cols = false; |
| 72 |
| 73 // Check if all of the operations were successful. |
| 74 float gray = elms && rows && cols ? 1.0 : 0.0; |
| 75 |
| 76 // Assign the varying variable color. |
| 77 color = vec4(gray, gray, gray, 1.0); |
| 78 |
| 79 // Transform the vertex position. |
| 80 gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex; |
| 81 } |
| 82 |
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