cBlend: More blending modes, implemented alpha blending

papadanku · Oct 26, 2024 · f8c09d6 · f8c09d6
1 parent de2ec79
commit f8c09d6
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Showing 2 changed files with 30 additions and 38 deletions.
diff --git a/shaders/cBlend.fx b/shaders/cBlend.fx
@@ -4,10 +4,18 @@
     [Shader Options]
 */
 
-uniform int _Blend <
-    ui_label = "Blend Mode";
+#include "shared/cColor.fxh"
+
+uniform int _ColorBlend <
+    ui_label = "Color Blend Mode";
+    ui_type = "combo";
+    ui_items = "Normal\0Multiply\0Screen\0Overlay\0Darken\0Lighten\0Color Dodge\0Color Burn\0Hard Light\0Soft Light\0Difference\0Exclusion\0";
+> = 0;
+
+uniform int _AlphaBlend <
+    ui_label = "Alpha Blend Mode";
     ui_type = "combo";
-    ui_items = "Add\0Subtract\0Multiply\0Min\0Max\0Screen\0";
+    ui_items = "Normal\0Multiply\0Screen\0Overlay\0Darken\0Lighten\0Color Dodge\0Color Burn\0Hard Light\0Soft Light\0Difference\0Exclusion\0";
 > = 0;
 
 uniform float3 _SrcFactor <
@@ -44,37 +52,19 @@ float4 PS_Copy(CShade_VS2PS_Quad Input) : SV_TARGET0
 
 float4 PS_Blend(CShade_VS2PS_Quad Input) : SV_TARGET0
 {
-    float4 Src = tex2D(SampleSrcTex, Input.Tex0) * float4(_SrcFactor, 1.0);
-    float4 Dest = tex2D(SampleDestTex, Input.Tex0) * float4(_DestFactor, 1.0);
+    float4 Src = tex2D(SampleSrcTex, Input.Tex0);
+    float4 Dest = tex2D(SampleDestTex, Input.Tex0);
 
-    float4 OutputColor = 0.0;
+    Src.rgb *= _SrcFactor;
+    Dest.rgb *= _DestFactor;
 
-    switch(_Blend)
-    {
-        case 0: // Add
-            OutputColor = Src + Dest;
-            break;
-        case 1: // Subtract
-            OutputColor = Src - Dest;
-            break;
-        case 2: // Multiply
-            OutputColor = Src * Dest;
-            break;
-        case 3: // Min
-            OutputColor = min(Src, Dest);
-            break;
-        case 4: // Max
-            OutputColor = max(Src, Dest);
-            break;
-        case 5: // Screen
-            OutputColor = (Src + Dest) - (Src * Dest);
-            break;
-        default:
-            OutputColor = Dest;
-            break;
-    }
+    float3 SrcAlpha = Src.a;
+    float3 DestAlpha = Dest.a;
+
+    float3 ColorBlend = CColor_Blend(Dest.rgb, Src.rgb, _ColorBlend);
+    float AlphaBlend = CColor_Blend(DestAlpha, SrcAlpha, _AlphaBlend).r;
 
-    return OutputColor;
+    return float4(ColorBlend, AlphaBlend);
 }
 
 technique CShade_CopyBuffer < ui_tooltip = "Create CBlend's copy texture"; >

diff --git a/shaders/shared/cColor.fxh b/shaders/shared/cColor.fxh
@@ -107,6 +107,8 @@
                 return CColor_BlendDifference(B, S);
             case 11: // Exclusion
                 return CColor_BlendExclusion(B, S);
+            default:
+            	return CColor_BlendNormal(B, S);
         }
     }
 
@@ -349,22 +351,22 @@
 
     static const float3x3 CColor_OKLABfromRGB_M1 = float3x3
     (
-        float3(0.4122214708, +0.5363325363, +0.0514459929),
-        float3(0.2119034982, +0.6806995451, +0.1073969566),
-        float3(0.0883024619, +0.2817188376, +0.6299787005)
+        float3(+0.4122214708, +0.5363325363, +0.0514459929),
+        float3(+0.2119034982, +0.6806995451, +0.1073969566),
+        float3(+0.0883024619, +0.2817188376, +0.6299787005)
     );
 
     static const float3x3 CColor_OKLABfromRGB_M2 = float3x3
     (
-        float3(0.2104542553, +0.7936177850f, -0.0040720468),
-        float3(1.9779984951, -2.4285922050f, +0.4505937099),
-        float3(0.0259040371, +0.7827717662f, -0.8086757660)
+        float3(+0.2104542553, +0.7936177850f, -0.0040720468),
+        float3(+1.9779984951, -2.4285922050f, +0.4505937099),
+        float3(+0.0259040371, +0.7827717662f, -0.8086757660)
     );
 
     float3 CColor_GetOKLABfromRGB(float3 Color)
     {
         float3 LMS = mul(CColor_OKLABfromRGB_M1, Color);
-        LMS = pow(LMS, 1.0 / 3.0);
+        LMS = pow(abs(LMS), 1.0 / 3.0);
         LMS = mul(CColor_OKLABfromRGB_M2, LMS);
         return LMS;
     };