glviewvol: sdr/fast.p.glsl annotate

glviewvol

annotate sdr/fast.p.glsl @ 10:89efc666105c

mostly done

author	John Tsiombikas <nuclear@member.fsf.org>
date	Wed, 31 Dec 2014 05:21:47 +0200
parents	931a6b35f1cd
children

rev	line source
nuclear@10	1 #version 120
nuclear@10	2
nuclear@4	3 uniform sampler3D vol_tex;
nuclear@4	4 uniform sampler1D xfer_tex;
nuclear@4	5
nuclear@10	6 uniform vec3 light_dir[3] = vec3[3](
nuclear@9	7 vec3(0.5, 0.5, 1.0),
nuclear@9	8 vec3(-1.0, 0.2, 0.5),
nuclear@9	9 vec3(-0.2, 0.0, -7.0)
nuclear@10	10 );
nuclear@10	11 uniform vec3 light_color[3] = vec3[3](
nuclear@9	12 vec3(0.9, 0.7, 0.68),
nuclear@9	13 vec3(0.5, 0.6, 0.9),
nuclear@9	14 vec3(0.3, 0.3, 0.3)
nuclear@10	15 );
nuclear@9	16
nuclear@9	17 const vec3 ambient = vec3(0.1, 0.1, 0.1);
nuclear@9	18 const vec3 vdir = vec3(0.0, 0.0, 1.0);
nuclear@9	19 const float dimmer = 0.7;
nuclear@9	20
nuclear@4	21 void main()
nuclear@4	22 {
nuclear@8	23 vec3 tc = gl_TexCoord[0].xyz;
nuclear@8	24 float max_manh_dist = max(tc.x, max(tc.y, tc.z));
nuclear@8	25 float min_manh_dist = min(tc.x, min(tc.y, tc.z));
nuclear@8	26 float border = step(0.0, min_manh_dist) * (1.0 - step(1.0, max_manh_dist));
nuclear@8	27
nuclear@4	28 vec4 voxel = texture3D(vol_tex, gl_TexCoord[0].xyz);
nuclear@4	29 vec4 color = texture1D(xfer_tex, voxel.a);
nuclear@4	30
nuclear@8	31 float alpha = color.a * border;
nuclear@8	32 if(alpha < 0.001) discard;
nuclear@8	33
nuclear@9	34 vec3 norm = normalize(voxel.rgb * 2.0 - 1.0);
nuclear@9	35
nuclear@9	36 vec3 diffuse = vec3(0.0, 0.0, 0.0);
nuclear@9	37 vec3 specular = vec3(0.0, 0.0, 0.0);
nuclear@9	38
nuclear@9	39 for(int i=0; i<3; i++) {
nuclear@9	40 vec3 ldir = normalize(light_dir[i]);
nuclear@9	41 vec3 hdir = normalize(vdir + ldir);
nuclear@9	42
nuclear@9	43 float ndotl = max(dot(norm, ldir), 0.0);
nuclear@9	44 float ndoth = max(dot(norm, hdir), 0.0);
nuclear@9	45
nuclear@9	46 diffuse += light_color[i] * color.rgb * ndotl;
nuclear@9	47 specular += light_color[i] * vec3(0.6, 0.6, 0.6) * pow(ndoth, 50.0);
nuclear@9	48 }
nuclear@9	49
nuclear@9	50 gl_FragColor.rgb = ambient + (diffuse + specular) * dimmer;
nuclear@8	51 gl_FragColor.a = alpha;
nuclear@4	52 }