From e265b7f69f9fa0d81e8d6882fae08a0acbb1c50c Mon Sep 17 00:00:00 2001
From: LaG1924 <lag1924@gmail.com>
Date: Tue, 28 Dec 2021 09:19:31 +0500
Subject: Added fallback liquids meshing

---
 src/AssetManager.cpp | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 src/AssetManager.hpp |  1 +
 2 files changed, 48 insertions(+)

diff --git a/src/AssetManager.cpp b/src/AssetManager.cpp
index 3e3f677..09f5209 100644
--- a/src/AssetManager.cpp
+++ b/src/AssetManager.cpp
@@ -573,6 +573,52 @@ BlockFaces &AssetManager::GetBlockModelByBlockId(BlockId block) {
 		return it->second;
 
 	BlockInfo *blockInfo = GetBlockInfo(block);
+	if (blockInfo->blockstate == "@liquid") {
+		BlockFaces blockFaces;
+		blockFaces.isBlock = false;
+		blockFaces.isLiquid = true;
+		blockFaces.transform = glm::mat4(1.0f);
+		blockFaces.ambientOcclusion = false;
+		for (size_t i = 0; i < FaceDirection::none; i++) {
+			blockFaces.faceDirectionVector[i] = FaceDirectionVector[i];
+		}
+
+		const auto& liquidInfo = GetBlockLiquidInfo(BlockId{ block.id, 0 });
+
+		{
+			AssetTexture* assetTexture = AssetManager::GetAsset<AssetTexture>("minecraft/textures/" + liquidInfo.flowTexture);
+			if (!assetTexture)
+				return errorFaces;
+			TextureCoord texture = atlas->GetTexture(assetTexture->id);
+			float textureFrames = assetTexture->frames;
+			blockFaces.faces.emplace_back(ParsedFace{
+				FaceDirection::none,
+				glm::translate(glm::mat4(1.0f), glm::vec3{0.0f, 1.0f, 0.0f}),
+				glm::vec4{ texture.x,texture.y,texture.w,texture.h },
+				static_cast<float>(texture.layer),
+				static_cast<float>(assetTexture->frames),
+				glm::vec3(1.0f),
+				});
+		}
+
+		{
+			AssetTexture* assetTexture = AssetManager::GetAsset<AssetTexture>("minecraft/textures/" + liquidInfo.stillTexture);
+			if (!assetTexture)
+				return errorFaces;
+			TextureCoord texture = atlas->GetTexture(assetTexture->id);
+			float textureFrames = assetTexture->frames;
+			blockFaces.faces.emplace_back(ParsedFace{
+				FaceDirection::none,
+				glm::translate(glm::mat4(1.0f), glm::vec3{0.0f, 1.0f, 0.0f}),
+				glm::vec4{ texture.x,texture.y,texture.w,texture.h },
+				static_cast<float>(texture.layer),
+				static_cast<float>(assetTexture->frames),
+				glm::vec3(1.0f),
+				});
+		}
+
+		return blockIdToBlockFaces.insert(std::make_pair(block, blockFaces)).first->second;
+	}
 	AssetBlockState *asset = GetAsset<AssetBlockState>("/minecraft/blockstates/" + blockInfo->blockstate);
 	if (!asset)
 		return errorFaces;
@@ -595,6 +641,7 @@ BlockFaces &AssetManager::GetBlockModelByBlockId(BlockId block) {
 	blockFaces.faces = assetModel->blockModel.parsedFaces;
 	blockFaces.isBlock = assetModel->blockModel.IsBlock;
 	blockFaces.ambientOcclusion = assetModel->blockModel.AmbientOcclusion;
+	blockFaces.isLiquid = false;
 	glm::mat4 transform = glm::mat4(1.0);
 
 	if (model.y != 0) {
diff --git a/src/AssetManager.hpp b/src/AssetManager.hpp
index 59fc851..cad7eaf 100644
--- a/src/AssetManager.hpp
+++ b/src/AssetManager.hpp
@@ -49,6 +49,7 @@ struct BlockFaces {
 	std::vector<ParsedFace> faces;
 	bool isBlock;
 	bool ambientOcclusion;
+	bool isLiquid; //if true, then faces contains only two elements with valid texture data
 	Vector faceDirectionVector[FaceDirection::none];
 };
 
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