volmetrics: data/shaders/transfer.f.glsl annotate

volmetrics

port to macosx

author	John Tsiombikas <nuclear@member.fsf.org>
date	Fri, 06 Feb 2015 21:15:23 +0200
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rev	line source
elene@24	1 uniform sampler3D tex;
elene@24	2 uniform float tmin;
elene@24	3 uniform float tmax;
elene@24	4
elene@24	5 float transfer(float x, float tmin, float tmax)
elene@24	6 {
elene@24	7 float dt = 0.25 * (tmax - tmin);
elene@24	8 return smoothstep(tmin - dt, tmin + dt, x) *
elene@24	9 (1.0 - smoothstep(tmax - dt, tmax + dt, x));
elene@24	10 }
elene@24	11
elene@24	12 void main()
elene@24	13 {
elene@24	14 float texel = texture3D(tex, gl_TexCoord[0].xyz).x;
elene@24	15 float val = transfer(texel, tmin, tmax);
elene@24	16
elene@24	17 gl_FragColor = vec4(val, val, val, 1.0);
elene@24	18 }