From a3a2cd9de26943efbc2a566228f95e7abb7cc4da Mon Sep 17 00:00:00 2001
From: Warwick <warwick.l.e.new@gmail.com>
Date: Wed, 25 Jun 2025 12:01:54 +0100
Subject: [PATCH] Added GL_Context and fixed debug memory leak detection

---
 .gitignore     |  1 +
 CMakeLists.txt | 38 +++++++++++++++++++-------------------
 src/main.c     | 21 ++++++++++++++++-----
 3 files changed, 36 insertions(+), 24 deletions(-)

diff --git a/.gitignore b/.gitignore
index bc41e13..d382326 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,4 @@ CPackSourceConfig.cmake
 Makefile
 _deps/
 cmake_install.cmake
+.cache/
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0b60519..3a88bdd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.16 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.25 FATAL_ERROR)
 project(webgpu
     VERSION 0
     DESCRIPTION "Simple Engine Experiment in C"
@@ -16,21 +16,11 @@ if(CMAKE_EXPORT_COMPILE_COMMANDS)
     ${CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES})
 endif()
 
-# Error on memory address issues in debug mode
-if(CMAKE_BUILD_TYPE MATCHES "Debug")
-  set(
-    CMAKE_C_FLAGS
-    "${CMAKE_C_FLAGS} -Werror -fsanitize=undefined -fsanitize=address"
-  )
-  target_link_options(${PROJECT_NAME}
-    BEFORE PUBLIC -fsanitize=undefined PUBLIC -fsanitize=address
-  )
-endif()
-
-
 option(USE_VENDORED_LIBRARIES "Use vendored libraries" ON)
 
 if(USE_VENDORED_LIBRARIES)
+  set(OpenGL_GL_PREFERENCE GLVND)
+
   add_definitions(-DSDL_STATIC=ON)
   add_subdirectory(extern/SDL3 EXCLUDE_FROM_ALL)
   set(SDL3_LIBRARIES SDL3::SDL3)
@@ -59,7 +49,6 @@ if(USE_VENDORED_LIBRARIES)
   set(GLEW_INCLUDE_DIRS ${glew_SOURCE_DIR}/include)
 
 
-  set(OpenGL_GL_PREFERENCE GLVND)
   find_package(OpenGL REQUIRED)
   set(OPENGL_LIBRARIES ${OPENGL_gl_LIBRARY})
   set(OPENGL_INCLUDE_DIRS ${OPENGL_INCLUDE_DIR})
@@ -67,11 +56,11 @@ else()
   find_package(SDL3 REQUIRED CONFIG REQUIRED COMPONENTS SDL3-shared)
 endif()
 
-get_cmake_property(_variableNames VARIABLES)
-list (SORT _variableNames)
-foreach (_variableName ${_variableNames})
-    message(STATUS "${_variableName}=${${_variableName}}")
-endforeach()
+#get_cmake_property(_variableNames VARIABLES)
+#list (SORT _variableNames)
+#foreach (_variableName ${_variableNames})
+#    message(STATUS "${_variableName}=${${_variableName}}")
+#endforeach()
 
 file(GLOB_RECURSE SOURCE_FILES
     ${CMAKE_SOURCE_DIR}/src/*.c)
@@ -79,6 +68,17 @@ file(GLOB_RECURSE HEADER_FILES
     ${CMAKE_SOURCE_DIR}/src/*.h)
 add_executable(${PROJECT_NAME} ${HEADER_FILES} ${SOURCE_FILES})
 
+# Error on memory address issues in debug mode
+if(CMAKE_BUILD_TYPE MATCHES "Debug")
+  set(
+    CMAKE_C_FLAGS
+    "${CMAKE_C_FLAGS} -Werror -fsanitize=undefined -fsanitize=address"
+  )
+  target_link_options(${PROJECT_NAME}
+    BEFORE PUBLIC -fsanitize=undefined PUBLIC -fsanitize=address
+  )
+endif()
+
 target_include_directories(${PROJECT_NAME} PRIVATE
     ${SDL3_INCLUDE_DIRS}
     ${SDL3_image_INCLUDE_DIRS}
diff --git a/src/main.c b/src/main.c
index a278470..8fb0f80 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,5 +1,6 @@
 #include "SDL3/SDL_init.h"
 #include "SDL3/SDL_log.h"
+#include "SDL3/SDL_opengl.h"
 #include "SDL3/SDL_render.h"
 #include "SDL3/SDL_video.h"
 #include <stdlib.h>
@@ -15,25 +16,35 @@ int main(int argc, char *argv[]) {
     return EXIT_FAILURE;
   }
 
-  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
-  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
+  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
+  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 6);
   SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
   SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
 
-  window = SDL_CreateWindow("Hello SDL3", 320, 240, SDL_WINDOW_OPENGL);
+  window = SDL_CreateWindow("Hello SDL3", 320, 240,
+                            SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
   if (!window) {
-    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
-                 "Couldn't create window and renderer: %s", SDL_GetError());
+    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create windowe: %s",
+                 SDL_GetError());
     return EXIT_FAILURE;
   }
 
+  SDL_GLContext glcontext = SDL_GL_CreateContext(window);
+
   while (1) {
+    // handle input
     SDL_PollEvent(&event);
     if (event.type == SDL_EVENT_QUIT) {
       break;
     }
+
+    // render
+    glClearColor(0, 0, 0, 1);
+    glClear(GL_COLOR_BUFFER_BIT);
+    SDL_GL_SwapWindow(window);
   }
 
+  SDL_GL_DestroyContext(glcontext);
   SDL_DestroyWindow(window);
 
   SDL_Quit();