Merge branch 'opengl3' of https://github.com/numberZero/irrlicht

[irrlicht.git] / media / Shaders / Reflection2Layer.fsh

diff --git a/media/Shaders/Reflection2Layer.fsh b/media/Shaders/Reflection2Layer.fsh
new file mode 100644 (file)
index 0000000..bdc3c66
--- /dev/null
+++ b/media/Shaders/Reflection2Layer.fsh
@@ -0,0 +1,72 @@
+#version 100
+
+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 * Color1) * vVertexColor + vSpecularColor;
+
+       if (bool(uFogEnable))
+       {
+               float FogFactor = computeFog();
+               vec4 FogColor = uFogColor;
+               FogColor.a = 1.0;
+               FinalColor = mix(FogColor, FinalColor, FogFactor);
+       }
+
+       gl_FragColor = FinalColor;
+}