mirror of https://github.com/minetest/irrlicht.git
83 lines
1.8 KiB
GLSL
83 lines
1.8 KiB
GLSL
#define MAX_LIGHTS 2
|
|
|
|
precision mediump float;
|
|
|
|
/* Uniforms */
|
|
|
|
uniform float uFactor;
|
|
uniform sampler2D uTextureUnit0;
|
|
uniform sampler2D uTextureUnit1;
|
|
uniform int uFogEnable;
|
|
uniform int uFogType;
|
|
uniform vec4 uFogColor;
|
|
uniform float uFogStart;
|
|
uniform float uFogEnd;
|
|
uniform float uFogDensity;
|
|
|
|
/* Varyings */
|
|
|
|
varying vec2 vTexCoord;
|
|
varying vec3 vEyeVector;
|
|
varying vec3 vLightVector[MAX_LIGHTS];
|
|
varying vec4 vLightColor[MAX_LIGHTS];
|
|
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 TempFetch = texture2D(uTextureUnit1, vTexCoord) * 2.0 - 1.0;
|
|
TempFetch *= uFactor;
|
|
|
|
vec3 EyeVector = normalize(vEyeVector);
|
|
vec2 TexCoord = EyeVector.xy * TempFetch.w + vTexCoord;
|
|
|
|
vec4 Color = texture2D(uTextureUnit0, TexCoord);
|
|
vec3 Normal = texture2D(uTextureUnit1, TexCoord).xyz * 2.0 - 1.0;
|
|
|
|
vec4 FinalColor = vec4(0.0, 0.0, 0.0, 0.0);
|
|
|
|
for (int i = 0; i < int(MAX_LIGHTS); i++)
|
|
{
|
|
vec3 LightVector = normalize(vLightVector[i]);
|
|
|
|
float Lambert = max(dot(LightVector, Normal), 0.0);
|
|
FinalColor += vec4(Lambert) * vLightColor[i];
|
|
}
|
|
|
|
FinalColor *= Color;
|
|
FinalColor.w = vLightColor[0].w;
|
|
|
|
if (bool(uFogEnable))
|
|
{
|
|
float FogFactor = computeFog();
|
|
vec4 FogColor = uFogColor;
|
|
FogColor.a = 1.0;
|
|
FinalColor = mix(FogColor, FinalColor, FogFactor);
|
|
}
|
|
|
|
gl_FragColor = FinalColor;
|
|
}
|