Pixel-Composer/shaders/sh_channel_R2A/sh_channel_R2A.fsh

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//
// Simple passthrough fragment shader
//
varying vec2 v_vTexcoord;
varying vec4 v_vColour;
void main() {
vec4 col = texture2D( gm_BaseTexture, v_vTexcoord );
gl_FragColor = vec4(0., 0., 0., col.r);
}