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

dungeon_crawler

added flag to force the use of the fallback renderer

author	John Tsiombikas <nuclear@member.fsf.org>
date	Thu, 30 Aug 2012 05:38:03 +0300
parents
children	3fef65352b0b

rev	line source
nuclear@41	1 uniform sampler2D tex_dif, tex_norm;
nuclear@41	2
nuclear@41	3 varying vec3 pos, norm, tang;
nuclear@41	4
nuclear@41	5 const float fog_start = 3.0;
nuclear@41	6 const float fog_end = 6.0;
nuclear@41	7
nuclear@41	8 void main()
nuclear@41	9 {
nuclear@41	10 vec3 texel = texture2D(tex_dif, gl_TexCoord[0].st).xyz;
nuclear@41	11
nuclear@41	12 vec3 n = normalize(norm);
nuclear@41	13 vec3 t = normalize(tang);
nuclear@41	14 vec3 b = cross(n, t);
nuclear@41	15
nuclear@41	16 mat3 tbn_mat = mat3(
nuclear@41	17 t.x, b.x, n.x,
nuclear@41	18 t.y, b.y, n.y,
nuclear@41	19 t.z, b.z, n.z);
nuclear@41	20
nuclear@41	21
nuclear@41	22 const vec3 lpos = vec3(0.0, 0.0, -0.5);
nuclear@41	23 vec3 ldir = tbn_mat * normalize(lpos - pos);
nuclear@41	24
nuclear@41	25 const vec3 vdir = vec3(0.0, 0.0, 1.0);
nuclear@41	26 vec3 hvec = normalize(vdir + ldir);
nuclear@41	27
nuclear@41	28 n = normalize(texture2D(tex_norm, gl_TexCoord[0].st).xyz * 2.0 - 1.0);
nuclear@41	29 float ndotl = max(dot(n, ldir), 0.0);
nuclear@41	30 float ndoth = max(dot(n, hvec), 0.0);
nuclear@41	31
nuclear@41	32 vec3 diffuse = gl_FrontMaterial.diffuse.xyz * texel * ndotl;
nuclear@41	33 vec3 specular = gl_FrontMaterial.specular.xyz * pow(ndoth, gl_FrontMaterial.shininess);
nuclear@41	34
nuclear@41	35 float fog = clamp((fog_end + pos.z) / (fog_end - fog_start), 0.0, 1.0);
nuclear@41	36
nuclear@41	37 gl_FragColor = vec4((diffuse + specular) * fog, 1.0);
nuclear@41	38 }