chore: sync workspace state

MVS/3DGS-Unity/Shaders/RenderGaussianSplats.shader

@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: MIT
+Shader "Gaussian Splatting/Render Splats"
+{
+    SubShader
+    {
+        Tags { "RenderType"="Transparent" "Queue"="Transparent" }
+
+        Pass
+        {
+            ZWrite Off
+            Blend OneMinusDstAlpha One
+            Cull Off
+            
+CGPROGRAM
+#pragma vertex vert
+#pragma fragment frag
+#pragma require compute
+#pragma use_dxc
+
+#include "GaussianSplatting.hlsl"
+
+StructuredBuffer<uint> _OrderBuffer;
+
+struct v2f
+{
+    half4 col : COLOR0;
+    float2 pos : TEXCOORD0;
+    float4 vertex : SV_POSITION;
+};
+
+StructuredBuffer<SplatViewData> _SplatViewData;
+ByteAddressBuffer _SplatSelectedBits;
+uint _SplatBitsValid;
+
+v2f vert (uint vtxID : SV_VertexID, uint instID : SV_InstanceID)
+{
+    v2f o = (v2f)0;
+    instID = _OrderBuffer[instID];
+	SplatViewData view = _SplatViewData[instID];
+	float4 centerClipPos = view.pos;
+	bool behindCam = centerClipPos.w <= 0;
+	if (behindCam)
+	{
+		o.vertex = asfloat(0x7fc00000); // NaN discards the primitive
+	}
+	else
+	{
+		o.col.r = f16tof32(view.color.x >> 16);
+		o.col.g = f16tof32(view.color.x);
+		o.col.b = f16tof32(view.color.y >> 16);
+		o.col.a = f16tof32(view.color.y);
+
+		uint idx = vtxID;
+		float2 quadPos = float2(idx&1, (idx>>1)&1) * 2.0 - 1.0;
+		quadPos *= 2;
+
+		o.pos = quadPos;
+
+		float2 deltaScreenPos = (quadPos.x * view.axis1 + quadPos.y * view.axis2) * 2 / _ScreenParams.xy;
+		o.vertex = centerClipPos;
+		o.vertex.xy += deltaScreenPos * centerClipPos.w;
+
+		// is this splat selected?
+		if (_SplatBitsValid)
+		{
+			uint wordIdx = instID / 32;
+			uint bitIdx = instID & 31;
+			uint selVal = _SplatSelectedBits.Load(wordIdx * 4);
+			if (selVal & (1 << bitIdx))
+			{
+				o.col.a = -1;				
+			}
+		}
+	}
+    return o;
+}
+
+half4 frag (v2f i) : SV_Target
+{
+	float power = -dot(i.pos, i.pos);
+	half alpha = exp(power);
+	if (i.col.a >= 0)
+	{
+		alpha = saturate(alpha * i.col.a);
+	}
+	else
+	{
+		// "selected" splat: magenta outline, increase opacity, magenta tint
+		half3 selectedColor = half3(1,0,1);
+		if (alpha > 7.0/255.0)
+		{
+			if (alpha < 10.0/255.0)
+			{
+				alpha = 1;
+				i.col.rgb = selectedColor;
+			}
+			alpha = saturate(alpha + 0.3);
+		}
+		i.col.rgb = lerp(i.col.rgb, selectedColor, 0.5);
+	}
+	
+    if (alpha < 1.0/255.0)
+        discard;
+
+    half4 res = half4(i.col.rgb * alpha, alpha);
+    return res;
+}
+ENDCG
+        }
+    }
+}