diff options
| -rw-r--r-- | src/glsl/builtins/glsl/determinant.glsl | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/glsl/builtins/glsl/determinant.glsl b/src/glsl/builtins/glsl/determinant.glsl new file mode 100644 index 00000000000..32695a874af --- /dev/null +++ b/src/glsl/builtins/glsl/determinant.glsl @@ -0,0 +1,70 @@ +/* + * Copyright © 2012 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +#version 120 +float determinant(mat2 m) +{ + return m[0][0] * m[1][1] - m[1][0] * m[0][1]; +} + +float determinant(mat3 m) +{ + return (+ m[0][0] * (m[1][1] * m[2][2] - m[1][2] * m[2][1]) + - m[0][1] * (m[1][0] * m[2][2] - m[1][2] * m[2][0]) + + m[0][2] * (m[1][0] * m[2][1] - m[1][1] * m[2][0])); +} + +float determinant(mat4 m) +{ + float SubFactor00 = m[2][2] * m[3][3] - m[3][2] * m[2][3]; + float SubFactor01 = m[2][1] * m[3][3] - m[3][1] * m[2][3]; + float SubFactor02 = m[2][1] * m[3][2] - m[3][1] * m[2][2]; + float SubFactor03 = m[2][0] * m[3][3] - m[3][0] * m[2][3]; + float SubFactor04 = m[2][0] * m[3][2] - m[3][0] * m[2][2]; + float SubFactor05 = m[2][0] * m[3][1] - m[3][0] * m[2][1]; + float SubFactor06 = m[1][2] * m[3][3] - m[3][2] * m[1][3]; + float SubFactor07 = m[1][1] * m[3][3] - m[3][1] * m[1][3]; + float SubFactor08 = m[1][1] * m[3][2] - m[3][1] * m[1][2]; + float SubFactor09 = m[1][0] * m[3][3] - m[3][0] * m[1][3]; + float SubFactor10 = m[1][0] * m[3][2] - m[3][0] * m[1][2]; + float SubFactor11 = m[1][1] * m[3][3] - m[3][1] * m[1][3]; + float SubFactor12 = m[1][0] * m[3][1] - m[3][0] * m[1][1]; + float SubFactor13 = m[1][2] * m[2][3] - m[2][2] * m[1][3]; + float SubFactor14 = m[1][1] * m[2][3] - m[2][1] * m[1][3]; + float SubFactor15 = m[1][1] * m[2][2] - m[2][1] * m[1][2]; + float SubFactor16 = m[1][0] * m[2][3] - m[2][0] * m[1][3]; + float SubFactor17 = m[1][0] * m[2][2] - m[2][0] * m[1][2]; + float SubFactor18 = m[1][0] * m[2][1] - m[2][0] * m[1][1]; + + vec4 adj_0; + + adj_0[0] = + (m[1][1] * SubFactor00 - m[1][2] * SubFactor01 + m[1][3] * SubFactor02); + adj_0[1] = - (m[1][0] * SubFactor00 - m[1][2] * SubFactor03 + m[1][3] * SubFactor04); + adj_0[2] = + (m[1][0] * SubFactor01 - m[1][1] * SubFactor03 + m[1][3] * SubFactor05); + adj_0[3] = - (m[1][0] * SubFactor02 - m[1][1] * SubFactor04 + m[1][2] * SubFactor05); + + return (+ m[0][0] * adj_0[0] + + m[0][1] * adj_0[1] + + m[0][2] * adj_0[2] + + m[0][3] * adj_0[3]); +} |