Update REMDER (Dx9)

FLARDATA/Shader/Irradiance.fp

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+//This shader file is part of FLAR - Advanced Renderer for Freelancer by Schmackbolzen
+//If you use the supplied shader files you may not modify them unless you state in them what you changed
+//and also mention the source or who the author is.
+//Code based on https://learnopengl.com/PBR/IBL/Specular-IBL
+
+#version 330
+#include "ColorConversion.inc"
+in vec3 WorldPos;
+
+uniform samplerCube environmentMap;
+uniform bool convertToLinear;
+
+const float PI = 3.14159265359;
+
+void main()
+{		
+    vec3 N = normalize(WorldPos);
+
+    vec3 irradiance = vec3(0.0);   
+    
+    // tangent space calculation from origin point
+    vec3 up    = vec3(0.0, 1.0, 0.0);
+    vec3 right = normalize(cross(up, N));
+    up         = normalize(cross(N, right));
+       
+    float sampleDelta = 0.025;
+    float nrSamples = 0.0f;
+    for(float phi = 0.0; phi < 2.0 * PI; phi += sampleDelta)
+    {
+        for(float theta = 0.0; theta < 0.5 * PI; theta += sampleDelta)
+        {
+            // spherical to cartesian (in tangent space)
+            vec3 tangentSample = vec3(sin(theta) * cos(phi),  sin(theta) * sin(phi), cos(theta));
+            // tangent space to world
+            vec3 sampleVec = tangentSample.x * right + tangentSample.y * up + tangentSample.z * N; 
+
+			vec3 texColor=texture(environmentMap, sampleVec).rgb;	
+            if(convertToLinear)
+				texColor=ToLinear(texColor);
+            irradiance += texColor * cos(theta) * sin(theta);
+            nrSamples++;
+        }
+    }
+    irradiance = PI * irradiance * (1.0 / float(nrSamples));
+    
+    gl_FragColor = vec4(ToGammaCorrected(irradiance), 1.0);	
+}