From 6aaedb813fa11ba0679c3051bc2eb28646b9506c Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 30 Aug 2025 16:53:58 -0700
Subject: Update to SDL3

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 src/contrib/SDL-3.2.20/docs/INTRO-emscripten.md | 50 +++++++++++++++++++++++++
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 create mode 100644 src/contrib/SDL-3.2.20/docs/INTRO-emscripten.md

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+
+# Introduction to SDL with Emscripten
+
+The easiest way to use SDL is to include it as a subproject in your project.
+
+We'll start by creating a simple project to build and run [hello.c](hello.c)
+
+First, you should have the Emscripten SDK installed from:
+
+https://emscripten.org/docs/getting_started/downloads.html
+
+Create the file CMakeLists.txt
+```cmake
+cmake_minimum_required(VERSION 3.16)
+project(hello)
+
+# set the output directory for built objects.
+# This makes sure that the dynamic library goes into the build directory automatically.
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/$<CONFIGURATION>")
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/$<CONFIGURATION>")
+
+# This assumes the SDL source is available in vendored/SDL
+add_subdirectory(vendored/SDL EXCLUDE_FROM_ALL)
+
+# on Web targets, we need CMake to generate a HTML webpage. 
+if(EMSCRIPTEN)
+  set(CMAKE_EXECUTABLE_SUFFIX ".html" CACHE INTERNAL "")
+endif()
+
+# Create your game executable target as usual
+add_executable(hello WIN32 hello.c)
+
+# Link to the actual SDL3 library.
+target_link_libraries(hello PRIVATE SDL3::SDL3)
+```
+
+Build:
+```sh
+emcmake cmake -S . -B build
+cd build
+emmake make
+```
+
+You can now run your app by pointing a webserver at your build directory and connecting a web browser to it, opening hello.html
+
+A more complete example is available at:
+
+https://github.com/Ravbug/sdl3-sample
+
+Additional information and troubleshooting is available in [README-emscripten.md](README-emscripten.md)
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