Ritchie Cunningham
a1c214caec
Adds a skydome with two scrolling layers of procedurally generated clouds to create an interestingish environment.
30 lines
867 B
GLSL
30 lines
867 B
GLSL
#version 330 core
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out vec4 FragColor;
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in vec3 TexCoords;
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uniform sampler2D u_CloudTexture;
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uniform vec3 u_LightDir;
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const float PI = 3.14159265359;
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void main() {
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/* Convert 3D texture coords to 2D using spherical mapping. */
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float u = atan(TexCoords.z, TexCoords.x) / (2.0 * PI) + 0.5;
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float v = asin(TexCoords.y) / PI + 0.5;
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/* Sample noise value from cloud texture. */
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float noise = texture(u_CloudTexture, vec2(u, v)).r;
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/* Create soft-edged clouds from the noise. */
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float cloudAlpha = smoothstep(0.5, 0.8, noise);
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/* Some simple lighting. */
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vec3 normal = normalize(TexCoords);
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float diffuse = max(dot(normal, -u_LightDir), 0.0);
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vec3 cloudColor = vec3(1.0) * (diffuse * 0.5 + 0.5); /* Add some ambient light. */
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/* Cloud colour is white. it's transparency is determined by alpha. */
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FragColor = vec4(cloudColor, cloudAlpha);
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}
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