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#version 130
in vec2 texCoord0;
in vec3 normal0;
in float height;
uniform sampler2D sampler;
uniform vec3 lightDirection;
uniform vec3 lightColor;
uniform vec3 ambientColor;
const vec3 grass = vec3(.1, .4, .05);
const vec3 sand = vec3(.76, .7, .5);
const vec3 snow = vec3(.97, .97, .99);
const float beachline = .5;
const float snowline_low = 28;
const float snowline_high = 30;
void
main()
{
gl_FragColor = texture(sampler, texCoord0);
gl_FragColor.rgb *= clamp(ambientColor + (dot(-lightDirection, normal0) * lightColor), 0.0, 1.0);
if (height < beachline) {
gl_FragColor.rgb *= sand;
}
else if (height > snowline_high) {
gl_FragColor.rgb *= snow;
}
else if (height > snowline_low) {
gl_FragColor.rgb *= mix(grass, snow, (height - snowline_low) / (snowline_high - snowline_low));
}
else {
gl_FragColor.rgb *= grass;
}
}
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