From c376f6f53f737d6220206baa323c0bc62d48a9f0 Mon Sep 17 00:00:00 2001
From: Leo Tenenbaum <pommicket@gmail.com>
Date: Fri, 20 Nov 2020 16:20:00 -0500
Subject: opening a window

---
 .gitignore |  5 +++++
 Makefile   |  6 +++++
 main.c     | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 86 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 main.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bfa099f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+ted
+*~
+*.swp
+tags
+TAGS
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..ad7b1d1
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,6 @@
+ALL_CFLAGS=$(CFLAGS) -Wall -Wextra -Wshadow -Wconversion -Wpedantic -pedantic -std=gnu11 \
+	-Wno-unused-function -Wno-fixed-enum-extension -Wimplicit-fallthrough
+LIBS=-lSDL2 -lGL -ldl
+DEBUG_CFLAGS=$(ALL_CFLAGS) $(LIBS) -DDEBUG -O0 -g
+ted: *.[ch]
+	$(CC) main.c -o $@ $(DEBUG_CFLAGS)
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..9d9b99d
--- /dev/null
+++ b/main.c
@@ -0,0 +1,75 @@
+#ifdef __GNUC__
+#define no_warn_start _Pragma("GCC diagnostic push") \
+	_Pragma("GCC diagnostic ignored \"-Wpedantic\"") \
+	_Pragma("GCC diagnostic ignored \"-Wsign-conversion\"") \
+	_Pragma("GCC diagnostic ignored \"-Wsign-compare\"") \
+	_Pragma("GCC diagnostic ignored \"-Wconversion\"") \
+	_Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"") \
+	_Pragma("GCC diagnostic ignored \"-Wunused-function\"")
+
+#define no_warn_end _Pragma("GCC diagnostic pop")
+#else
+#define no_warn_start
+#define no_warn_end
+#endif
+
+no_warn_start
+#include <SDL2/SDL.h>
+no_warn_end
+#include <GL/gl.h>
+#include <stdbool.h>
+
+static void die(char const *fmt, ...) {
+	char buf[256] = {0};
+	
+	va_list args;
+	va_start(args, fmt);
+	vsnprintf(buf, sizeof buf - 1, fmt, args);
+	va_end(args);
+
+	// show a message box, and if that fails, print to stderr
+	if (SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error", buf, NULL) < 0) {
+		fprintf(stderr, "%s\n", buf);
+	}
+
+	exit(EXIT_FAILURE);
+}
+
+
+int main(void) {
+	if (SDL_Init(SDL_INIT_VIDEO) < 0)
+		die("%s", SDL_GetError());
+
+	SDL_Window *window = SDL_CreateWindow("ted", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 1280, 720, SDL_WINDOW_SHOWN|SDL_WINDOW_OPENGL);
+	if (!window)
+		die("%s", SDL_GetError());
+
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+	SDL_GLContext *glctx = SDL_GL_CreateContext(window);
+	if (!glctx) {
+		die("%s", SDL_GetError());
+	}
+
+	SDL_GL_SetSwapInterval(1); // vsync
+
+	
+	bool quit = false;
+	while (!quit) {
+		SDL_Event event;
+		while (SDL_PollEvent(&event)) {
+			switch (event.type) {
+			case SDL_QUIT:
+				quit = true;
+				break;
+			}
+		}
+
+		glClearColor(0,0,0,1);
+		glClear(GL_COLOR_BUFFER_BIT);
+
+		SDL_GL_SwapWindow(window);
+	}
+
+	return 0;
+}
-- 
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