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fog shader: use squared distance

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* This avoids one sqrt call per fragment. Immensive performance improvement
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Bixilon 2022-08-29 09:29:33 +02:00
parent 440145a42d
commit 8ddf99791f
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GPG Key ID: 5CAD791931B09AC4
2 changed files with 15 additions and 13 deletions
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8
src/main/java/de/bixilon/minosoft/gui/rendering/camera/FogManager.kt
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@ -126,16 +126,16 @@ class FogManager(
private fun updateShaders() {
val start = interpolatedFogStart
val end = interpolatedFogEnd
val color = interpolatedFogColor
val revision = interpolatedRevision
if (revision == this.shaderRevision) {
return
}
val start = interpolatedFogStart * interpolatedFogStart
val end = interpolatedFogEnd * interpolatedFogEnd
val color = interpolatedFogColor
for (shader in renderWindow.renderSystem.shaders) {
if (FOG_COLOR !in shader.uniforms) {
continue

20
src/main/resources/assets/minosoft/rendering/shader/includes/fog.glsl
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@ -15,20 +15,20 @@ in vec3 finFragmentPosition;
uniform vec3 uCameraPosition;
uniform float uFogStart = 60.0f;
uniform float uFogEnd = 75.0f;
uniform float uFogStart = 60.0f * 60.0f;
uniform float uFogEnd = 75.0f * 75.0f;
uniform vec4 uFogColor;
uniform bool uUseFogColor = false;
float calulate_fog_alpha(float distance) {
if (distance < uFogStart) {
float calulate_fog_alpha(float distance2) {
if (distance2 < uFogStart) {
return 1.0f;
}
if (distance > uFogEnd) {
if (distance2 > uFogEnd) {
return 0.0f;
}
return pow(1.0f - (distance - uFogStart) / (uFogEnd - uFogStart), 2);
return pow(1.0f - (distance2 - uFogStart) / (uFogEnd - uFogStart), 2);
}
float calculate_fog() {
@ -36,15 +36,17 @@ float calculate_fog() {
return 1.0f;
};
#ifdef FOG_SPHERE
float distance = length(finFragmentPosition.xyz - uCameraPosition.xyz);
vec3 distance_vec3 = finFragmentPosition.xyz - uCameraPosition.xyz;
float distance = dot(distance_vec3, distance_vec3);
#else
float distance = length(finFragmentPosition.xz - uCameraPosition.xz);
vec2 distance_vec2 = finFragmentPosition.xz - uCameraPosition.xz;
float distance = dot(distance_vec2, distance_vec2);
#endif
return calulate_fog_alpha(distance);
}
void set_fog() {
float alpha = calculate_fog();
float alpha = calculate_fog();
if (uUseFogColor) {
foutColor.rgb = mix(uFogColor.rgb, foutColor.rgb, foutColor.a * alpha);
foutColor.a = 1.0f;