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

dungeon_crawler

fixed the shader non-conformity by explicitly converting 2.2 to vec3 before passing it to pow for the texel inverse-gamma thing

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 27 Oct 2012 01:54:39 +0300
parents	acfe0c0110fc
children

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@43	8 const vec3 lpos = vec3(0.0, 0.0, -0.5);
nuclear@43	9 const vec3 vdir = vec3(0.0, 0.0, 1.0);
nuclear@43	10
nuclear@43	11 const vec3 lcol = vec3(1.0, 0.732, 0.437);
nuclear@43	12
nuclear@41	13 void main()
nuclear@41	14 {
nuclear@41	15 vec3 texel = texture2D(tex_dif, gl_TexCoord[0].st).xyz;
nuclear@41	16
nuclear@41	17 vec3 n = normalize(norm);
nuclear@41	18 vec3 t = normalize(tang);
nuclear@41	19 vec3 b = cross(n, t);
nuclear@41	20
nuclear@41	21 mat3 tbn_mat = mat3(
nuclear@41	22 t.x, b.x, n.x,
nuclear@41	23 t.y, b.y, n.y,
nuclear@41	24 t.z, b.z, n.z);
nuclear@41	25
nuclear@41	26 vec3 ldir = tbn_mat * normalize(lpos - pos);
nuclear@41	27 vec3 hvec = normalize(vdir + ldir);
nuclear@41	28
nuclear@41	29 n = normalize(texture2D(tex_norm, gl_TexCoord[0].st).xyz * 2.0 - 1.0);
nuclear@41	30 float ndotl = max(dot(n, ldir), 0.0);
nuclear@41	31 float ndoth = max(dot(n, hvec), 0.0);
nuclear@41	32
nuclear@41	33 vec3 diffuse = gl_FrontMaterial.diffuse.xyz * texel * ndotl;
nuclear@41	34 vec3 specular = gl_FrontMaterial.specular.xyz * pow(ndoth, gl_FrontMaterial.shininess);
nuclear@41	35
nuclear@41	36 float fog = clamp((fog_end + pos.z) / (fog_end - fog_start), 0.0, 1.0);
nuclear@41	37
nuclear@43	38 gl_FragColor = vec4((diffuse + specular) * lcol * fog, 1.0);
nuclear@41	39 }