skyboxFragmentShader.txt

#version 400

in vec3 textureCoords;
out vec4 out_Color;

uniform samplerCube cubeMap;
uniform samplerCube cubeMap2;
uniform float blendFactor;
uniform vec3 fogColour;

const float lowerLimit = 0.0;
const float upperLimit = 30.0;

void main(void){
	vec4 texture1 = texture(cubeMap, textureCoords);
    vec4 texture2 = texture(cubeMap2, textureCoords);
    vec4 finalColour = mix(texture1, texture2, blendFactor);

	float factor = (textureCoords.y - lowerLimit) / (upperLimit - lowerLimit);
	factor = clamp(factor, 0.0, 1.0);
	out_Color = mix(vec4(fogColour, 1.0), finalColour, factor);
}