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precision mediump float;
/* Uniforms */
uniform int uTextureUsage0;
uniform int uTextureUsage1;
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 vTextureCoord0;
varying vec2 vTextureCoord1;
varying vec4 vVertexColor;
varying vec4 vSpecularColor;
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 Color0 = vec4(1.0, 1.0, 1.0, 1.0);
vec4 Color1 = vec4(1.0, 1.0, 1.0, 1.0);
if (bool(uTextureUsage0))
Color0 = texture2D(uTextureUnit0, vTextureCoord0);
if (bool(uTextureUsage1))
Color1 = texture2D(uTextureUnit1, vTextureCoord1);
vec4 FinalColor = (Color0 * vVertexColor.a + Color1 * (1.0 - vVertexColor.a)) * vVertexColor;
FinalColor += vSpecularColor;
if (bool(uFogEnable))
{
float FogFactor = computeFog();
vec4 FogColor = uFogColor;
FogColor.a = 1.0;
FinalColor = mix(FogColor, FinalColor, FogFactor);
}
gl_FragColor = FinalColor;
}
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