diff options
Diffstat (limited to '3rdparty/bgfx/examples/common/shaderlib.sh')
-rw-r--r-- | 3rdparty/bgfx/examples/common/shaderlib.sh | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/3rdparty/bgfx/examples/common/shaderlib.sh b/3rdparty/bgfx/examples/common/shaderlib.sh index 2bcd43d7df2..f0aee192493 100644 --- a/3rdparty/bgfx/examples/common/shaderlib.sh +++ b/3rdparty/bgfx/examples/common/shaderlib.sh @@ -1,5 +1,5 @@ /* - * Copyright 2011-2018 Branimir Karadzic. All rights reserved. + * Copyright 2011-2019 Branimir Karadzic. All rights reserved. * License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause */ @@ -392,4 +392,22 @@ vec2 texture2DBc5(sampler2D _sampler, vec2 _uv) #endif } +mat3 cofactor( mat4 _m ) +{ + // Reference: + // Cofactor of matrix. Use to transform normals. The code assumes the last column of _m is [0,0,0,1]. + // https://www.shadertoy.com/view/3s33zj + // https://github.com/graphitemaster/normals_revisited + return mat3( + _m[1][1]*_m[2][2]-_m[1][2]*_m[2][1], + _m[1][2]*_m[2][0]-_m[1][0]*_m[2][2], + _m[1][0]*_m[2][1]-_m[1][1]*_m[2][0], + _m[0][2]*_m[2][1]-_m[0][1]*_m[2][2], + _m[0][0]*_m[2][2]-_m[0][2]*_m[2][0], + _m[0][1]*_m[2][0]-_m[0][0]*_m[2][1], + _m[0][1]*_m[1][2]-_m[0][2]*_m[1][1], + _m[0][2]*_m[1][0]-_m[0][0]*_m[1][2], + _m[0][0]*_m[1][1]-_m[0][1]*_m[1][0] ); +} + #endif // __SHADERLIB_SH__ |