diff options
Diffstat (limited to 'source/gameengine/Rasterizer/RAS_OpenGLFilters/RAS_Prewitt2DFilter.h')
-rw-r--r-- | source/gameengine/Rasterizer/RAS_OpenGLFilters/RAS_Prewitt2DFilter.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/source/gameengine/Rasterizer/RAS_OpenGLFilters/RAS_Prewitt2DFilter.h b/source/gameengine/Rasterizer/RAS_OpenGLFilters/RAS_Prewitt2DFilter.h new file mode 100644 index 00000000000..a6897bd33d4 --- /dev/null +++ b/source/gameengine/Rasterizer/RAS_OpenGLFilters/RAS_Prewitt2DFilter.h @@ -0,0 +1,31 @@ +#ifndef __RAS_PREWITT2DFILTER +#define __RAS_PREWITT2DFILTER + +char * PrewittFragmentShader=STRINGIFY( +uniform sampler2D sampler0; +uniform vec2 tc_offset[9]; + +void main(void) +{ + vec4 sample[9]; + + for (int i = 0; i < 9; i++) + { + sample[i] = texture2D(sampler0, + gl_TexCoord[0].st + tc_offset[i]); + } + + vec4 horizEdge = sample[2] + sample[5] + sample[8] - + (sample[0] + sample[3] + sample[6]); + + vec4 vertEdge = sample[0] + sample[1] + sample[2] - + (sample[6] + sample[7] + sample[8]); + + gl_FragColor.rgb = sqrt((horizEdge.rgb * horizEdge.rgb) + + (vertEdge.rgb * vertEdge.rgb)); + gl_FragColor.a = 1.0; +} + +); +#endif + |