From 9a61a71b09860d1703ffa5122846447eb7f16a55 Mon Sep 17 00:00:00 2001
From: var <var@birdideas.net>
Date: Sun, 29 Mar 2026 22:48:55 -0500
Subject: [PATCH] Create window

Program creates an OpenGL window that can be resized or go fullscreen. Nothing drawn inside the window yet.
---
 src/game.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/game.h | 12 ++++++++
 src/main.c | 25 ++++++++++++++-
 3 files changed, 126 insertions(+), 1 deletion(-)
 create mode 100644 src/game.c
 create mode 100644 src/game.h

diff --git a/src/game.c b/src/game.c
new file mode 100644
index 0000000..19b98d7
--- /dev/null
+++ b/src/game.c
@@ -0,0 +1,90 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include "SDL2/SDL.h"
+#include "GL/glew.h"
+#include "SDL2/SDL_opengl.h"
+#include "game.h"
+
+GameState *Game_New()
+{
+	GameState *gs = calloc(1, sizeof(GameState));
+	
+	SDL_Init(SDL_INIT_VIDEO);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 5);
+	SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
+	
+	gs->window = SDL_CreateWindow("Game", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1920, 1080, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);;
+	gs->glContext = SDL_GL_CreateContext(gs->window);
+	printf("Created OpenGL window.\n");
+	
+	glewInit();
+	glEnable(GL_DEPTH_TEST);
+	glEnable(GL_CULL_FACE);
+	glEnable(GL_TEXTURE_2D);
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+	printf("Initialized OpenGL.\n");
+	
+	gs->running = true;
+	return gs;
+}
+
+static void HandleKeyDown(GameState *gs, SDL_KeyCode sym)
+{
+	switch (sym)
+	{
+	case SDLK_ESCAPE:
+		gs->running = false;
+		break;
+	case SDLK_BACKQUOTE:
+		SDL_bool currentMode = SDL_GetRelativeMouseMode();
+		SDL_SetRelativeMouseMode(currentMode == SDL_FALSE ? SDL_TRUE : SDL_FALSE);
+		break;
+	case SDLK_F11:
+		{
+			Uint32 windowFlags = SDL_GetWindowFlags(gs->window);
+			if ((windowFlags & SDL_WINDOW_FULLSCREEN_DESKTOP) != 0) windowFlags = 0;
+			else windowFlags = SDL_WINDOW_FULLSCREEN_DESKTOP;
+			SDL_SetWindowFullscreen(gs->window, windowFlags);
+		}
+		break;
+	}
+}
+
+static void HandleKeyUp(GameState *gs, SDL_KeyCode sym)
+{
+}
+
+void Game_Update(GameState *gs)
+{
+	SDL_Event sdlEvent;
+	
+	while (SDL_PollEvent(&sdlEvent))
+	{
+		switch (sdlEvent.type)
+		{
+		case SDL_QUIT:
+			printf("Event: SDL_QUIT\n");
+			gs->running = false;
+			break;
+		case SDL_KEYDOWN:
+			if (sdlEvent.key.repeat == 0)
+			{
+				HandleKeyDown(gs, sdlEvent.key.keysym.sym);
+			}
+			break;
+		case SDL_KEYUP:
+			HandleKeyUp(gs, sdlEvent.key.keysym.sym);
+			break;
+		}
+	}
+}
+
+void Game_Destroy(GameState *gs)
+{
+	SDL_GL_DeleteContext(gs->glContext);
+	SDL_DestroyWindow(gs->window);
+	free(gs);
+}
diff --git a/src/game.h b/src/game.h
new file mode 100644
index 0000000..8cfb966
--- /dev/null
+++ b/src/game.h
@@ -0,0 +1,12 @@
+#include <stdbool.h>
+
+typedef struct
+{
+	bool running;
+	SDL_Window *window;
+	SDL_GLContext *glContext;
+} GameState;
+
+GameState *Game_New();
+void Game_Update(GameState *gs);
+void Game_Destroy(GameState *gs);
diff --git a/src/main.c b/src/main.c
index 3c6bf72..fc22242 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,6 +1,29 @@
 #include <stdio.h>
+#include "SDL2/SDL.h"
+#include "SDL2/SDL_timer.h"
+#include "game.h"
 
 int main(int argc, char* argv[])
 {
-	printf("Hello World!\n");
+	printf("Starting...\n");
+	GameState *gs = Game_New();
+	
+	if (gs == NULL)
+	{
+		printf("Failed to start.\n");
+		return 1;
+	}
+	
+	while (gs->running)
+	{
+		Game_Update(gs);
+		SDL_Delay(100);
+	}
+	
+	printf("Shutting down...\n");
+	Game_Destroy(gs);
+	SDL_Quit();
+	printf("Done.\n");
+	
+	return 0;
 }