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

dungeon_crawler

added samurai's texel center fix for the color grading palette lookup

author	John Tsiombikas <nuclear@member.fsf.org>
date	Tue, 23 Oct 2012 14:57:08 +0300
parents	a27528035e20
children	d89b403f630b

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@72	7 vec4 color = texture2D(fbtex, gl_TexCoord[0].st);
nuclear@76	8 vec3 tc = (color.xyz * 15.0 + 0.5) / 16.0;
nuclear@72	9 // use that color as an index into the palette
nuclear@76	10 gl_FragColor = vec4(texture3D(paltex, tc).xyz, color.a);
nuclear@65	11 }