chore: sync workspace state

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

@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: MIT
+Shader "Gaussian Splatting/Debug/Render Boxes"
+{
+    SubShader
+    {
+        Tags { "RenderType"="Transparent" "Queue"="Transparent" }
+
+        Pass
+        {
+            ZWrite Off
+            Blend OneMinusDstAlpha One
+            Cull Front
+
+CGPROGRAM
+#pragma vertex vert
+#pragma fragment frag
+#pragma require compute
+#pragma use_dxc
+
+#include "UnityCG.cginc"
+#include "GaussianSplatting.hlsl"
+
+StructuredBuffer<uint> _OrderBuffer;
+
+bool _DisplayChunks;
+
+struct v2f
+{
+    half4 col : COLOR0;
+    float4 vertex : SV_POSITION;
+};
+
+float _SplatScale;
+float _SplatOpacityScale;
+
+// based on https://iquilezles.org/articles/palettes/
+// cosine based palette, 4 vec3 params
+half3 palette(float t, half3 a, half3 b, half3 c, half3 d)
+{
+    return a + b*cos(6.28318*(c*t+d));
+}
+
+v2f vert (uint vtxID : SV_VertexID, uint instID : SV_InstanceID)
+{
+    v2f o;
+    bool chunks = _DisplayChunks;
+	uint idx = vtxID;
+	float3 localPos = float3(idx&1, (idx>>1)&1, (idx>>2)&1) * 2.0 - 1.0;
+
+    float3 centerWorldPos = 0;
+
+    if (!chunks)
+    {
+        // display splat boxes
+        instID = _OrderBuffer[instID];
+        SplatData splat = LoadSplatData(instID);
+
+        float4 boxRot = splat.rot;
+        float3 boxSize = splat.scale;
+        boxSize *= _SplatScale;
+
+        float3x3 splatRotScaleMat = CalcMatrixFromRotationScale(boxRot, boxSize);
+        splatRotScaleMat = mul((float3x3)unity_ObjectToWorld, splatRotScaleMat);
+
+        centerWorldPos = splat.pos;
+        centerWorldPos = mul(unity_ObjectToWorld, float4(centerWorldPos,1)).xyz;
+
+        o.col.rgb = saturate(splat.sh.col);
+        o.col.a = saturate(splat.opacity * _SplatOpacityScale);
+
+        localPos = mul(splatRotScaleMat, localPos) * 2;
+    }
+    else
+    {
+        // display chunk boxes
+        localPos = localPos * 0.5 + 0.5;
+        SplatChunkInfo chunk = _SplatChunks[instID];
+        float3 posMin = float3(chunk.posX.x, chunk.posY.x, chunk.posZ.x);
+        float3 posMax = float3(chunk.posX.y, chunk.posY.y, chunk.posZ.y);
+
+        localPos = lerp(posMin, posMax, localPos);
+        localPos = mul(unity_ObjectToWorld, float4(localPos,1)).xyz;
+
+        o.col.rgb = palette((float)instID / (float)_SplatChunkCount, half3(0.5,0.5,0.5), half3(0.5,0.5,0.5), half3(1,1,1), half3(0.0, 0.33, 0.67));
+        o.col.a = 0.1;
+    }
+
+    float3 worldPos = centerWorldPos + localPos;
+    o.vertex = UnityWorldToClipPos(worldPos);
+
+    return o;
+}
+
+half4 frag (v2f i) : SV_Target
+{
+    half4 res = half4(i.col.rgb * i.col.a, i.col.a);
+    return res;
+}
+ENDCG
+        }
+    }
+}