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

dungeon_crawler

annotate prototype/sdr/mrt.p.glsl @ 80:a373b36ffc17

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author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 27 Oct 2012 01:59:39 +0300
parents	110b2af4b9d8
children

rev	line source
nuclear@20	1 /* MRT assignments
nuclear@35	2 * 0 - RGB: position, A: shininess
nuclear@20	3 * 1 - RGB: normal
nuclear@60	4 * 2 - RGB: diffuse color, A: shininess str.
nuclear@60	5 * 3 - unused
nuclear@20	6 */
nuclear@20	7
nuclear@20	8 uniform sampler2D tex_dif, tex_norm;
nuclear@20	9
nuclear@35	10 varying vec3 pos, norm, tang;
nuclear@35	11
nuclear@35	12 const float fog_start = 3.0;
nuclear@35	13 const float fog_end = 6.0;
nuclear@16	14
nuclear@16	15 void main()
nuclear@16	16 {
nuclear@20	17 vec3 n = normalize(norm);
nuclear@35	18 vec3 t = normalize(tang);
nuclear@35	19 vec3 b = cross(n, t);
nuclear@35	20
nuclear@35	21 mat3 tbn_mat = mat3(
nuclear@35	22 t.x, t.y, t.z,
nuclear@35	23 b.x, b.y, b.z,
nuclear@35	24 n.x, n.y, n.z);
nuclear@35	25
nuclear@35	26 // grab normal from the normal map, remap it and transform it to view space
nuclear@35	27 n = texture2D(tex_norm, gl_TexCoord[0].st).xyz * 2.0 - 1.0;
nuclear@37	28 n = normalize(tbn_mat * n);
nuclear@35	29
nuclear@35	30 float fog = clamp((fog_end + pos.z) / (fog_end - fog_start), 0.0, 1.0);
nuclear@20	31
nuclear@78	32 vec3 texel_srgb = texture2D(tex_dif, gl_TexCoord[0].st).xyz;
nuclear@80	33 vec3 texel = pow(texel_srgb.xyz, vec3(2.2));
nuclear@78	34
nuclear@78	35 vec3 diffuse = fog * (gl_FrontMaterial.diffuse.xyz * texel);
nuclear@35	36 vec3 spec = fog * gl_FrontMaterial.specular.xyz;
nuclear@20	37 float sstr = (spec.x + spec.y + spec.z) / 3.0;
nuclear@20	38
nuclear@34	39 gl_FragData[0] = vec4(pos, gl_FrontMaterial.shininess);
nuclear@35	40 gl_FragData[1] = vec4(n, 0.0);
nuclear@20	41 gl_FragData[2] = vec4(diffuse, sstr);
nuclear@33	42 //gl_FragData[3] = vec4(0.0, 0.0, 0.0, 0.0);
nuclear@16	43 }