c9860f7b66
Plus renamed setupViewport to setup[2|3]DViewport. Migrated mWindowRect to mWindowRectRaw, mVirtualWindowRect to mWindowRectScaled. Slowly updating getwindow/getworldview calls to new v2 variants as I run across them. Cleaned up ascent-related code in llmanip.cpp. Impostor update tweaks. Edgepatch water occlusion changes. (no patch flickering on edges of screen while moving camera)
80 lines
2.2 KiB
GLSL
80 lines
2.2 KiB
GLSL
/**
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* @file WLCloudsF.glsl
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*
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* $LicenseInfo:firstyear=2005&license=viewerlgpl$
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* $/LicenseInfo$
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*/
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/////////////////////////////////////////////////////////////////////////
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// The fragment shader for the sky
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/////////////////////////////////////////////////////////////////////////
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varying vec4 vary_CloudColorSun;
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varying vec4 vary_CloudColorAmbient;
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varying float vary_CloudDensity;
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uniform sampler2D cloud_noise_texture;
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uniform vec4 cloud_pos_density1;
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uniform vec4 cloud_pos_density2;
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uniform vec4 gamma;
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/// Soft clips the light with a gamma correction
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vec3 scaleSoftClip(vec3 light) {
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//soft clip effect:
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light = 1. - clamp(light, vec3(0.), vec3(1.));
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light = 1. - pow(light, gamma.xxx);
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return light;
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}
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void main()
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{
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// Set variables
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vec2 uv1 = gl_TexCoord[0].xy;
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vec2 uv2 = gl_TexCoord[1].xy;
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vec4 cloudColorSun = vary_CloudColorSun;
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vec4 cloudColorAmbient = vary_CloudColorAmbient;
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float cloudDensity = vary_CloudDensity;
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vec2 uv3 = gl_TexCoord[2].xy;
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vec2 uv4 = gl_TexCoord[3].xy;
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// Offset texture coords
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uv1 += cloud_pos_density1.xy; //large texture, visible density
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uv2 += cloud_pos_density1.xy; //large texture, self shadow
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uv3 += cloud_pos_density2.xy; //small texture, visible density
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uv4 += cloud_pos_density2.xy; //small texture, self shadow
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// Compute alpha1, the main cloud opacity
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float alpha1 = (texture2D(cloud_noise_texture, uv1).x - 0.5) + (texture2D(cloud_noise_texture, uv3).x - 0.5) * cloud_pos_density2.z;
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alpha1 = min(max(alpha1 + cloudDensity, 0.) * 10. * cloud_pos_density1.z, 1.);
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// And smooth
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alpha1 = 1. - alpha1 * alpha1;
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alpha1 = 1. - alpha1 * alpha1;
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// Compute alpha2, for self shadowing effect
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// (1 - alpha2) will later be used as percentage of incoming sunlight
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float alpha2 = (texture2D(cloud_noise_texture, uv2).x - 0.5);
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alpha2 = min(max(alpha2 + cloudDensity, 0.) * 2.5 * cloud_pos_density1.z, 1.);
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// And smooth
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alpha2 = 1. - alpha2;
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alpha2 = 1. - alpha2 * alpha2;
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// Combine
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vec4 color;
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color = (cloudColorSun*(1.-alpha2) + cloudColorAmbient);
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color *= 2.;
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/// Gamma correct for WL (soft clip effect).
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gl_FragData[0] = vec4(scaleSoftClip(color.rgb), alpha1);
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gl_FragData[1] = vec4(0.0,0.0,0.0,0.0);
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gl_FragData[2] = vec4(0,0,1,0);
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}
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