55 lines
1.3 KiB
GLSL
55 lines
1.3 KiB
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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// A skybox cube with two cloud layers, which get occluded by a blended
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// second skybox cube.
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//==============================================================================
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!!ver 110
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!!permu FOG
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!!samps cloudA=0 cloudB=1 box:samplerCube=2 mountains:samplerCube=3
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#include "sys/defs.h"
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#include "sys/fog.h"
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varying vec3 cloudpos;
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varying vec3 boxpos;
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#ifdef VERTEX_SHADER
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void main ()
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{
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boxpos = v_position.xyz - e_eyepos;
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cloudpos = v_position.xyz;
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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 mountains = textureCube( s_mountains, boxpos );
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vec4 box = textureCube( s_box, boxpos );
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vec2 tccoord;
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vec3 dir = cloudpos - e_eyepos;
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dir.z *= 3.0;
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dir.xy /= 0.5 * length( dir );
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tccoord = ( dir.xy + e_time * 0.015 );
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vec4 cloud1_f = texture2D( s_cloudA, tccoord );
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tccoord = ( dir.xy + e_time * 0.02 );
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vec4 cloud2_f = texture2D( s_cloudA, tccoord );
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gl_FragColor.rgb = mix( box.rgb, cloud1_f.rgb, cloud1_f.a );
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gl_FragColor = vec4( mix( gl_FragColor.rgb, cloud2_f.rgb, cloud2_f.a ), 1.0 );
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if (mountains.a > 0.9) {
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gl_FragColor.rgb = mix( gl_FragColor.rgb, mountains.rgb, mountains.a);
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}
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gl_FragColor *= e_lmscale;
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#ifdef FOGGED
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gl_FragColor.rgb = fog3(gl_FragColor.rgb);
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#endif
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}
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#endif
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