31 lines
720 B
Text
31 lines
720 B
Text
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//regular sky shader for scrolling q1 skies
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//the sky surfaces are thrown through this as-is.
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#ifdef VERTEX_SHADER
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varying vec3 pos;
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void main ()
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{
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pos = 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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uniform float e_time;
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uniform vec3 e_eyepos;
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varying vec3 pos;
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uniform sampler2D s_t0;
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uniform sampler2D s_t1;
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void main ()
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{
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vec2 tccoord;
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vec3 dir = pos - 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*0.03125);
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vec3 solid = vec3(texture2D(s_t0, tccoord));
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tccoord = (dir.xy + e_time*0.0625);
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vec4 clouds = texture2D(s_t1, tccoord);
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gl_FragColor.rgb = (solid.rgb*(1.0-clouds.a)) + (clouds.a*clouds.rgb);
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}
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#endif
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