RAS_Sobel2DFilter.h File Reference

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Variables
const char *	SobelFragmentShader

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Detailed Description

Definition in file RAS_Sobel2DFilter.h.

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Variable Documentation

const char* SobelFragmentShader

Initial value:

STRINGIFY(
uniform sampler2D bgl_RenderedTexture;
uniform vec2 bgl_TextureCoordinateOffset[9];

void main(void)
{
    vec4 sample[9];

    for (int i = 0; i < 9; i++)
    {
        sample[i] = texture2D(bgl_RenderedTexture,
                              gl_TexCoord[0].st + bgl_TextureCoordinateOffset[i]);
    }

    vec4 horizEdge = sample[2] + (2.0*sample[5]) + sample[8] -
            (sample[0] + (2.0*sample[3]) + sample[6]);

    vec4 vertEdge = sample[0] + (2.0*sample[1]) + sample[2] -
            (sample[6] + (2.0*sample[7]) + sample[8]);

    gl_FragColor.rgb = sqrt((horizEdge.rgb * horizEdge.rgb) +
                            (vertEdge.rgb * vertEdge.rgb));
    gl_FragColor.a = 1.0;
}
)

Definition at line 35 of file RAS_Sobel2DFilter.h.