minetest/client/shaders/Irrlicht/TransparentAlphaChannel.fsh
sfan5 b010714426
[no sq] Move shaders & remove dead Irrlicht tests (#15006)
* Move irrlicht shaders to correct place

* Remove unused Irrlicht tests
2024-08-19 09:17:52 +02:00

70 lines
1.3 KiB
GLSL

#version 100
precision mediump float;
/* Uniforms */
uniform float uAlphaRef;
uniform int uTextureUsage0;
uniform sampler2D uTextureUnit0;
uniform int uFogEnable;
uniform int uFogType;
uniform vec4 uFogColor;
uniform float uFogStart;
uniform float uFogEnd;
uniform float uFogDensity;
/* Varyings */
varying vec2 vTextureCoord0;
varying vec4 vVertexColor;
varying float vFogCoord;
float computeFog()
{
const float LOG2 = 1.442695;
float FogFactor = 0.0;
if (uFogType == 0) // Exp
{
FogFactor = exp2(-uFogDensity * vFogCoord * LOG2);
}
else if (uFogType == 1) // Linear
{
float Scale = 1.0 / (uFogEnd - uFogStart);
FogFactor = (uFogEnd - vFogCoord) * Scale;
}
else if (uFogType == 2) // Exp2
{
FogFactor = exp2(-uFogDensity * uFogDensity * vFogCoord * vFogCoord * LOG2);
}
FogFactor = clamp(FogFactor, 0.0, 1.0);
return FogFactor;
}
void main()
{
vec4 Color = vVertexColor;
if (bool(uTextureUsage0))
{
Color *= texture2D(uTextureUnit0, vTextureCoord0);
// TODO: uAlphaRef should rather control sharpness of alpha, don't know how to do that right now and this works in most cases.
if (Color.a < uAlphaRef)
discard;
}
if (bool(uFogEnable))
{
float FogFactor = computeFog();
vec4 FogColor = uFogColor;
FogColor.a = 1.0;
Color = mix(FogColor, Color, FogFactor);
}
gl_FragColor = Color;
}