42 lines
821 B
GLSL
42 lines
821 B
GLSL
//======= Copyright (c) 2015-2020 Vera Visions LLC. All rights reserved. =======
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//
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// Purpose:
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//
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// Shader used for fading out surfaces after a certain distance.
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// It only has a diffuse map.
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//==============================================================================
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!!ver 110
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!!permu FOG
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!!samps diffuse=0
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#include "sys/defs.h"
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#include "sys/fog.h"
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varying vec2 tex_c;
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varying float eyedist;
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#ifdef VERTEX_SHADER
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void main ()
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{
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tex_c = v_texcoord;
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eyedist = abs( length( e_eyepos - v_position.xyz ) ) / 2048.0;
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if (eyedist > 1.0) {
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eyedist = 1.0;
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} else if (eyedist < 0.0) {
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eyedist = 0.0;
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}
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gl_Position = ftetransform();
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}
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#endif
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#ifdef FRAGMENT_SHADER
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void main ()
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{
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vec4 diffuse_f = texture2D(s_diffuse, tex_c);
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gl_FragColor = vec4( diffuse_f.rgb, (1.0 - eyedist) * diffuse_f.a);
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}
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#endif
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