Shaders: Add new pack of shaders (reshade) (#3232)

- Add crt-geom, super-xbr, geom, multi-LUT, deblur-luma, bicubic and lanczos3. All .fx shaders;
- Added some LUTs.

data/resources/shaders/reshade/Shaders/misc/multi-LUT.fx

@@ -0,0 +1,75 @@
+#include "ReShade.fxh"
+
+
+//    Multi-LUT Shader
+
+//    A simple shader that can load 2 LUTs.
+//    Can turn LUT off too.
+
+
+
+uniform int LUT_selector <
+    ui_type = "combo";
+    ui_items = "Off\0Grade-RGB\0Grade-Composite\0";
+    ui_label = "LUT selector";
+    ui_tooltip = "Off: nothing. Grade-RGB: rgb trinitron colors. Grade-Composite: composite trinitron colors.";
+> = 1;
+
+
+texture tLUT1<source="../Textures/multi-LUT/grade-rgb.png";>{Width=1024;Height=32;};
+sampler SamplerLUT1{Texture=tLUT1;};
+
+texture tLUT2<source="../Textures/multi-LUT/grade-composite.png";>{Width=1024;Height=32;};
+sampler SamplerLUT2{Texture=tLUT2;};
+
+// This shouldn't be necessary but it seems some undefined values can
+// creep in and each GPU vendor handles that differently. This keeps
+// all values within a safe range
+float4 mixfix(float4 a, float4 b, float c)
+{
+    return (a.z < 1.0) ? lerp(a, b, c) : a;
+}
+
+float4 multiLUT(float4 vpos: SV_Position, float2 vTexCoord : TEXCOORD0) : SV_Target
+{
+    float4 imgColor = tex2D(ReShade::BackBuffer, vTexCoord.xy);
+
+    if (LUT_selector > 0)
+    {
+        //float LUT_Size = lerp(textureSize(SamplerLUT1, 0).y, textureSize(SamplerLUT2, 0).y, LUT_selector_param - 1.0);
+        float LUT_Size = 32.0;
+        float4 color1, color2 = float4(0.,0.,0.,0.);
+        float red, green, blue1, blue2, mixer = 0.0;
+    
+        red = ( imgColor.r * (LUT_Size - 1.0) + 0.4999 ) / (LUT_Size * LUT_Size);
+        green = ( imgColor.g * (LUT_Size - 1.0) + 0.4999 ) / LUT_Size;
+        blue1 = (floor( imgColor.b  * (LUT_Size - 1.0) ) / LUT_Size) + red;
+        blue2 = (ceil( imgColor.b  * (LUT_Size - 1.0) ) / LUT_Size) + red;
+        mixer = clamp(max((imgColor.b - blue1) / (blue2 - blue1), 0.0), 0.0, 32.0);
+    
+        if(LUT_selector == 1)
+        {
+    	    color1 = tex2D(SamplerLUT1, float2( blue1, green ));
+            color2 = tex2D(SamplerLUT1, float2( blue2, green )); 
+        }
+        else
+        {
+    	    color1 = tex2D(SamplerLUT2, float2( blue1, green ));
+    	    color2 = tex2D(SamplerLUT2, float2( blue2, green ));
+        }
+        imgColor = mixfix(color1, color2, mixer);
+    }
+
+    return imgColor;
+}
+
+
+
+technique multiLUT
+{
+    pass PS_multiLUT
+    {
+    	VertexShader = PostProcessVS;
+    	PixelShader  = multiLUT;
+    }
+}