Cleanup image processing example script.

    char a;

};

void filter(struct color_s *in, struct color_s *out, struct vecF32_3_s *luminanceVector) {

    struct vecF32_3_s pixel;

    pixel.x = (in->r & 0xFF) / 255.0f;

    pixel.y = (in->g & 0xFF) / 255.0f;

    pixel.z = (in->b & 0xFF) / 255.0f;

    float luminance = vec3Dot(luminanceVector, &pixel);

    luminance = maxf(0.0f, luminance - Params->threshold);

    vec3Scale(&pixel, signf(luminance));

    out->a = in->a;

    out->r = pixel.x * 255.0f;

    out->g = pixel.y * 255.0f;

    out->b = pixel.z * 255.0f;

}

void main() {

    int t = uptimeMillis();

    struct color_s *in = (struct color_s *) InPixel;

    struct color_s *out = (struct color_s *) OutPixel;

    struct vecF32_3_s luminanceVector;

    luminanceVector.x = 0.2125f;

    luminanceVector.y = 0.7154f;

    luminanceVector.z = 0.0721f;

    int count = Params->inWidth * Params->inHeight;

    int i;

    float threshold = (Params->threshold * 255.f);

    for (i = 0; i < count; i++) {

        filter(in, out, &luminanceVector);

        float luminance = 0.2125f * in->r +

                          0.7154f * in->g +

                          0.0721f * in->b;

        luminance = maxf(0.0f, luminance - threshold);

        vec3Scale(&pixel, luminance > 0);

        out->a = in->a;

        out->r = pixel.x;

        out->g = pixel.y;

        out->b = pixel.z;

        in++;

        out++;