Graphics/TileMap: Fix material index rendering

ChangeLog.md

@@ -166,6 +166,7 @@ Nazara Engine:
 - Fixed SystemCursor_Move not showing up on Windows
 - Fixed Window movement constructor/assignation operator
 - Window::PushEvent is now public (useful for pushing external events ie. when using Qt or similar framework controlling window)
+- Fixed TileMap not rendering the right materials if it had no tile using some materials in-between
 
 Nazara Development Kit:
 - Added ImageWidget (#139)

src/Nazara/Graphics/TileMap.cpp

@@ -27,14 +27,14 @@ namespace Nz
 	{
 		const VertexStruct_XYZ_Color_UV* vertices = reinterpret_cast<const VertexStruct_XYZ_Color_UV*>(instanceData.data.data());
 
-		std::size_t matCount = 0;
 		std::size_t spriteCount = 0;
-		for (const Layer& layer : m_layers)
+		for (std::size_t layerIndex = 0; layerIndex < m_layers.size(); ++layerIndex)
 		{
+			const auto& layer = m_layers[layerIndex];
 			if (layer.tiles.empty())
 				continue;
 
-			renderQueue->AddSprites(instanceData.renderOrder, GetMaterial(matCount++), &vertices[4 * spriteCount], layer.tiles.size(), scissorRect);
+			renderQueue->AddSprites(instanceData.renderOrder, GetMaterial(layerIndex), &vertices[4 * spriteCount], layer.tiles.size(), scissorRect);
 
 			spriteCount += layer.tiles.size();
 		}