Fix color correction bug on AMD cards

Author: tobspr

Shader/Includes/ColorCorrection.include

@@ -3,21 +3,17 @@
 
 #pragma include "Includes/Configuration.include"
 
-vec3 applyColorLUT(sampler2D lut, vec3 color) {
-
-    color = saturate(color);
+vec3 applyColorLUT(sampler2D lut, vec3 color)
+    {
     float lutSize = float(textureSize(lut, 0).y);
-    color = clamp(color, vec3(1.0 / lutSize), vec3(1.0 - 1.0 / lutSize));
+    color = clamp(color, vec3(0.5 / lutSize), vec3(1.0 - 0.5 / lutSize));
     vec2 texcXY = vec2(color.r / lutSize, 1.0 - color.g);
-    int frameZ = int(color.b * lutSize);
-    float lerpFactor = fract(color.b * lutSize); 
-
 
+    int frameZ = int(color.b * lutSize);
+    float offsZ = fract(color.b * lutSize);
 
+    vec3 sample1 = textureLod(lut, texcXY + vec2(frameZ / lutSize, 0), 0).rgb;
+    vec3 sample2 = textureLod(lut, texcXY + vec2( (frameZ + 1) / lutSize, 0), 0).rgb;
 
-    vec3 sample1 = texture(lut, texcXY + vec2(frameZ / lutSize, 0) ).rgb;
-    vec3 sample2 = texture(lut, texcXY + vec2( (frameZ + 1) / lutSize, 0)).rgb;
-
-
-    return mix(sample1, sample2, lerpFactor);
-}
+    return mix(sample1, sample2, offsZ);
+}