mirror of
https://github.com/PixelGuys/Cubyz.git
synced 2025-08-03 11:17:05 -04:00
92 lines
3.2 KiB
GLSL
92 lines
3.2 KiB
GLSL
#version 430
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out vec4 fragColor;
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in vec2 texCoords;
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in vec3 direction;
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uniform sampler2D color;
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uniform sampler2D depthTexture;
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uniform float zNear;
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uniform float zFar;
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uniform vec2 tanXY;
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layout(binding = 5) uniform sampler2D bloomColor;
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struct Fog {
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vec3 color;
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float density;
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float fogLower;
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float fogHigher;
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};
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uniform Fog fog;
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uniform ivec3 playerPositionInteger;
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uniform vec3 playerPositionFraction;
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float zFromDepth(float depthBufferValue) {
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return zNear*zFar/(depthBufferValue*(zNear - zFar) + zFar);
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}
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float densityIntegral(float dist, float zStart, float zDist, float fogLower, float fogHigher) {
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// The density is constant until fogLower, then gets smaller linearly until reaching fogHigher, past which there is no fog.
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if(zDist < 0) {
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zStart += zDist;
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zDist = -zDist;
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}
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if(zDist == 0) {
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zDist = 0.1;
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}
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zStart /= zDist;
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fogLower /= zDist;
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fogHigher /= zDist;
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zDist = 1;
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float beginLower = min(fogLower, zStart);
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float endLower = min(fogLower, zStart + zDist);
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float beginMid = max(fogLower, min(fogHigher, zStart));
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float endMid = max(fogLower, min(fogHigher, zStart + zDist));
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float midIntegral = -0.5*(endMid - fogHigher)*(endMid - fogHigher)/(fogHigher - fogLower) - -0.5*(beginMid - fogHigher)*(beginMid - fogHigher)/(fogHigher - fogLower);
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if(fogHigher == fogLower) midIntegral = 0;
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return (endLower - beginLower + midIntegral)/zDist*dist;
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}
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float calculateFogDistance(float dist, float densityAdjustment, float zStart, float zScale, float fogDensity, float fogLower, float fogHigher) {
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float distCameraTerrain = densityIntegral(dist*densityAdjustment, zStart, zScale*dist*densityAdjustment, fogLower, fogHigher)*fogDensity;
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float distFromCamera = 0;
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float distFromTerrain = distFromCamera - distCameraTerrain;
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if(distCameraTerrain < 10) { // Resolution range is sufficient.
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return distFromTerrain;
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} else {
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// Here we have a few options to deal with this. We could for example weaken the fog effect to fit the entire range.
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// I decided to keep the fog strength close to the camera and far away, with a fog-free region in between.
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// I decided to this because I want far away fog to work (e.g. a distant ocean) as well as close fog(e.g. the top surface of the water when the player is under it)
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if(distFromTerrain > -5 && dist != 0) {
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return distFromTerrain;
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} else if(distFromCamera < 5) {
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return distFromCamera - 10;
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} else {
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return -5;
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}
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}
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}
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vec3 applyFrontfaceFog(float fogDistance, vec3 fogColor, vec3 inColor) {
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float fogFactor = exp(fogDistance);
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inColor *= fogFactor;
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inColor += fogColor;
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inColor -= fogColor*fogFactor;
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return inColor;
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}
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void main() {
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fragColor = texture(color, texCoords);
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fragColor += texture(bloomColor, texCoords);
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float densityAdjustment = sqrt(dot(tanXY*(texCoords*2 - 1), tanXY*(texCoords*2 - 1)) + 1);
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float dist = zFromDepth(texture(depthTexture, texCoords).r);
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float fogDistance = calculateFogDistance(dist, densityAdjustment, playerPositionInteger.z + playerPositionFraction.z, normalize(direction).z, fog.density, fog.fogLower, fog.fogHigher);
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fragColor.rgb = applyFrontfaceFog(fogDistance, fog.color, fragColor.rgb);
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float maxColor = max(1.0, max(fragColor.r, max(fragColor.g, fragColor.b)));
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fragColor.rgb = fragColor.rgb/maxColor;
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}
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