Client: Set up a new frame uniform for fog parameters

This is required to modify the fog effect for a given scene. Disabling the fog by setting the limits is a bit hacky, but no need to introduce a separate flag just for this...

Core/NativeClient/Renderer.lua

@@ -734,6 +734,19 @@ function Renderer:UpdateScenewideUniformBuffer(deltaTime)
 	perSceneUniformData.cameraWorldPosition.y = cameraWorldPosition.y
 	perSceneUniformData.cameraWorldPosition.z = cameraWorldPosition.z
 
+	if not self.fogParameters then
+		-- Disabling the effect in a roundabout way to avoid a new uniform just for this
+		perSceneUniformData.fogNearLimit = 10
+		perSceneUniformData.fogFarLimit = 1
+	else
+		local viewDistance = C_Camera.farPlaneDistanceInWorldUnits - C_Camera.nearPlaneDistanceInWorldUnits
+		perSceneUniformData.fogNearLimit = self.fogParameters.near * viewDistance
+		perSceneUniformData.fogFarLimit = self.fogParameters.far * viewDistance
+		perSceneUniformData.fogColorRed = self.fogParameters.color.red
+		perSceneUniformData.fogColorGreen = self.fogParameters.color.green
+		perSceneUniformData.fogColorBlue = self.fogParameters.color.blue
+	end
+
 	Queue:WriteBuffer(
 		Device:GetQueue(self.wgpuDevice),
 		self.cameraViewportUniform.buffer,

Core/NativeClient/WebGPU/UniformBuffer.lua

@@ -37,6 +37,13 @@ local UniformBuffer = {
 			float directionalLightIntensity; // 192
 			Vector3D cameraWorldPosition; // 204
 			float padding[1]; // 208
+			float fogColorRed; // 212
+			float fogColorGreen; // 216
+			float fogColorBlue; // 220
+			float padding[1]; // 224
+			float fogNearLimit; // 228
+			float fogFarLimit; // 232
+			float padding[2]; // 240
 			// Padding needs to be updated whenever the struct changes!
 		} scenewide_uniform_t;
 		typedef struct PerMaterialData {