// vert //

void main(void) {
	gl_Position = qgl_ftransform();
}


// frag //

uniform sampler2D tex_0, tex_sum;

const vec3 luma = vec3(0.299, 0.587, 0.114);

void main(void) {
	ivec2 tc = ivec2(gl_FragCoord.xy);
	vec4 src = texelFetch(tex_0, tc, 0);
	vec4 sum = texelFetch(tex_sum, ivec2(0,0), 0);
	vec3 res = src.rgb;
	float l = dot(res, luma);
	float g = 2.2/dot(sum.rgb, luma);
	res /= l;
	//res = log(res + vec3(2.)) - log(vec3(2.));
	//res = pow(res,vec3(1/2.2));
	//l = pow(l,1/2.2);
	l = 1 - exp(-l*g);
	//l /= 100;
	//res = pow(res,vec3(2.2));
	//l = pow(l,2.2);
	qgl_FragColor.rgb = res * l;
	//qgl_FragColor.rgb = sum.rgb*10;
}