Add screenshots and fix compile warnings

- Reduce cmake required version to ubuntu distributed version.

Author: atxi

.github/screenshot1.png

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.30)
+cmake_minimum_required(VERSION 3.28)
 
 if (NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Choose Release or Debug" FORCE)

.github/screenshot2.png

@@ -7,12 +7,19 @@ It uses the original assets that are downloaded from the resources server.
 The downloaded assets will be stored in `%appdata%/Polymer/` on Windows and `~/.polymer/` on Linux.
 
 ### Screenshots
-![Polymer Image](https://i.imgur.com/rAfkvtd.png)
+Typical scene in a village.  
+![Standard scene](.github/screenshot1.png)
+
+Rendering inside a cave.  
+![Cave lighting](.github/screenshot2.png)
+  
+Rendering with a radius of 32 chunks in a very dense area.  
+![Dense chunks](.github/screenshot3.png)
 
 ### Running
 Main development is done on Windows. It can run on Linux, but not tested much.  
 
-- Requires `blocks-1.20.4.json` that is generated from running Minecraft with a [certain flag](https://wiki.vg/Data_Generators#Generators) or from the [polymer release page](https://github.com/atxi/Polymer/releases).
+- Requires `blocks-1.21.4.json` that is generated from running Minecraft with a [certain flag](https://minecraft.fandom.com/wiki/Tutorials/Running_the_data_generator) or from the [polymer release page](https://github.com/atxi/Polymer/releases).
 - Requires compiled shaders. Get them from the release page or read the building section below if manually building.
 - Requires an internet connection on first launch so it can download the necessary assets.
 
@@ -28,7 +35,7 @@ The project is configured to use vcpkg as a dependency manager, so follow the di
 
 #### Requirements
 - C++ compiler (tested with MSVC 2022 and Clang)
-- [CMake](https://cmake.org/) at least version 3.30.1
+- [CMake](https://cmake.org/) at least version 3.28
 
 #### Windows
 - Open terminal in polymer folder.

.github/screenshot3.png

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.30)
+cmake_minimum_required(VERSION 3.28)
 
 file(GLOB_RECURSE SOURCES ${PROJECT_SOURCE_DIR}/lib/*.cpp *.cpp)
 

CMakeLists.txt

@@ -477,7 +477,7 @@ size_t AssetParser::LoadTextures() {
       {
         MemoryRevert reverter = arena->GetReverter();
         size_t meta_size = 0;
-        char metaname[512];
+        char metaname[520];
 
         sprintf(metaname, "%s.mcmeta", texture_files[i].name);
 

README.md

@@ -370,7 +370,7 @@ String RingBuffer::ReadAllocString(MemoryArena& arena) {
 
   if (!this->ReadVarInt(&length)) {
     this->read_offset = offset_snapshot;
-    return 0;
+    return {};
   }
 
   result.data = (char*)arena.Allocate(length);