dungeon_crawler: prototype/sdr/post.p.glsl annotate

dungeon_crawler

gamma correct rendering

author	John Tsiombikas <nuclear@member.fsf.org>
date	Fri, 26 Oct 2012 21:22:14 +0300
parents	d89b403f630b
children

rev	line source
nuclear@65	1 uniform sampler2D fbtex;
nuclear@72	2 uniform sampler3D paltex;
nuclear@65	3
nuclear@65	4 void main()
nuclear@65	5 {
nuclear@72	6 // lookup the render output color for this pixel
nuclear@77	7 vec4 fbcolor = texture2D(fbtex, gl_TexCoord[0].st);
nuclear@77	8 vec3 tc = (fbcolor.xyz * 15.0 + 0.5) / 16.0;
nuclear@72	9 // use that color as an index into the palette
nuclear@77	10 vec3 color = texture3D(paltex, tc).xyz;
nuclear@77	11 // gamma-correction
nuclear@78	12
nuclear@78	13 gl_FragColor = vec4(color, fbcolor.a);
nuclear@78	14 //gl_FragColor = vec4(pow(color, 1.0 / 2.2), fbcolor.a);
nuclear@78	15 //gl_FragColor = vec4(sqrt(color), fbcolor.a);
nuclear@65	16 }