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//
// Fragment shader for drawing the earth with multiple textures
//
// Author: Randi Rost
//
// Copyright (c) 2002-2004 3Dlabs Inc. Ltd.
//
// See 3Dlabs-License.txt for license information
//
uniform sampler2D EarthDay;
uniform sampler2D EarthNight;
uniform sampler2D EarthCloudGloss;
varying float Diffuse;
varying vec3 Specular;
varying vec2 TexCoord;
void main (void)
{
// Monochrome cloud cover value will be in clouds.r
// Gloss value will be in clouds.g
// clouds.b will be unused
vec3 clouds = texture2D(EarthCloudGloss, TexCoord).stp;
vec3 daytime = (texture2D(EarthDay, TexCoord).stp * Diffuse +
Specular * clouds.g) * (1.0 - clouds.r) +
clouds.r * Diffuse;
vec3 nighttime = texture2D(EarthNight, TexCoord).stp *
(1.0 - clouds.r);
vec3 color = daytime;
if (Diffuse < -0.1)
color = nighttime;
if (abs(Diffuse) <= 0.1)
color = mix(nighttime, daytime, (Diffuse + 0.1) * 5.0);
gl_FragColor = vec4(color, 1.0);
}
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