64 lines
1.7 KiB
GLSL
64 lines
1.7 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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// Basic skybox shader with two clouds rendered on top using a dodge filter.
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//==============================================================================
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!!ver 110
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!!permu FOG
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!!samps hdr_40:samplerCube=0 hdr_250:samplerCube=1 hdr_1600:samplerCube=2 cloudA=3 cloudB=4
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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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float hdr_scale;
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vec3 sky_out;
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vec3 skybox_40 = textureCube( s_hdr_40, boxpos ).rgb;
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vec3 skybox_250 = textureCube( s_hdr_250, boxpos ).rgb;
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vec3 skybox_1600 = textureCube( s_hdr_1600, boxpos ).rgb;
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hdr_scale = (e_lmscale.r + e_lmscale.g + e_lmscale.b) / 3.0;
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if (hdr_scale > 1.0) {
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sky_out = mix(skybox_250, skybox_40, hdr_scale - 1.0);
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} else {
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sky_out = mix(skybox_1600, skybox_250, hdr_scale);
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}
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/* the cloud bits */
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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_cloudB, tccoord );
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vec3 dodged1 = vec3(1.0,1.0,1.0) - (cloud1_f.rgb * vec3(cloud1_f.a, cloud1_f.a, cloud1_f.a));
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vec3 dodged2 = vec3(1.0,1.0,1.0) - (cloud2_f.rgb * vec3(cloud2_f.a, cloud2_f.a, cloud2_f.a));
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gl_FragColor.rgb = sky_out / dodged1;
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gl_FragColor.rgb = gl_FragColor.rgb / dodged2;
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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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