irrlicht/media/Shaders/COGLES2NormalMap.fsh

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#define MAX_LIGHTS 2
precision mediump float;
/* Uniforms */
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 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 Color = texture2D(uTextureUnit0, vTexCoord);
vec3 Normal = texture2D(uTextureUnit1, vTexCoord).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;
}