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#version 330 core
uniform sampler2D tex;
uniform vec3 sun_direction;
uniform vec3 sky_color;
in vec3 surface_normal;
in vec2 frag_tex_coord;
in float depth;
out vec4 color;
void main() {
float brightness = dot(normalize(surface_normal), normalize(-sun_direction));
vec3 diffuse = vec3(max(brightness, 0.3));
color = vec4(diffuse, 1.0) * texture(tex, frag_tex_coord);
color = mix(vec4(sky_color, 1.0), color, 1 - depth);
}
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