ab.rgbluma.jxs

<jittershader name="rgbluma">
	<description>
	Convert to a luminance image
	</description>
	<param name="tex0" type="int" default="0" />
	<language name="glsl" version="1.0">
		<bind param="tex0" program="fp" />
		<program name="vp" type="vertex" source="sh.passthru.xform.vp.glsl" />
		<program name="fp" type="fragment">
<![CDATA[

// texcoords
varying vec2 texcoord0;

// samplers
uniform sampler2DRect tex0;

const vec4 lumcoeff = vec4(0.299,0.587,0.114,0.);

// entry point
void main()
{   
	vec4 a = texture2DRect(tex0, texcoord0);
	float luma = dot(a,lumcoeff);
	gl_FragColor = vec4(luma);
}

]]>
		</program>
	</language>
</jittershader>