Use a faster way to find the closest light probe

Fix light probe not being applied to psprite

src/rendering/hwrenderer/scene/hw_spritelight.cpp

@@ -45,6 +45,50 @@ T smoothstep(const T edge0, const T edge1, const T x)
 	return t * t * (3.0 - 2.0 * t);
 }
 
+LightProbe* FindLightProbe(FLevelLocals* level, float x, float y, float z)
+{
+	LightProbe* foundprobe = nullptr;
+	if (level->LightProbes.Size() > 0)
+	{
+#if 1
+		float radiusSquared = 32.0f * 32.0f;
+		float lastdist = 0.0f;
+		BSPWalkCircle(level, x, y, radiusSquared, [&](subsector_t* subsector) // Iterate through all subsectors potentially touched by actor
+		{
+			for (uint32_t i = 0; i < subsector->numprobes; i++)
+			{
+				LightProbe* probe = subsector->firstprobe + i;
+				float dx = probe->X - x;
+				float dy = probe->Y - y;
+				float dz = probe->Z - z;
+				float dist = dx * dx + dy * dy + dz * dz;
+				if (!foundprobe || dist < lastdist)
+				{
+					foundprobe = probe;
+					lastdist = dist;
+				}
+			}
+		});
+#else
+		float lastdist = 0.0f;
+		for (unsigned int i = 0; i < level->LightProbes.Size(); i++)
+		{
+			LightProbe *probe = &level->LightProbes[i];
+			float dx = probe->X - x;
+			float dy = probe->Y - y;
+			float dz = probe->Z - z;
+			float dist = dx * dx + dy * dy + dz * dz;
+			if (i == 0 || dist < lastdist)
+			{
+				foundprobe = probe;
+				lastdist = dist;
+			}
+		}
+#endif
+	}
+	return foundprobe;
+}
+
 //==========================================================================
 //
 // Sets a single light value from all dynamic lights affecting the specified location
@@ -57,7 +101,15 @@ void HWDrawInfo::GetDynSpriteLight(AActor *self, float x, float y, float z, FLig
 	float frac, lr, lg, lb;
 	float radius;
 	
-	Level->GetLightProbeLight(x, y, z, out);
+	out[0] = out[1] = out[2] = 0.f;
+
+	LightProbe* probe = FindLightProbe(Level, x, y, z);
+	if (probe)
+	{
+		out[0] = probe->Red;
+		out[1] = probe->Green;
+		out[2] = probe->Blue;
+	}
 
 	// Go through both light lists
 	while (node)