1 files changed, 65 insertions, 0 deletions
diff --git a/gui.c b/gui.c
new file mode 100644
index 0000000..04a53b3
--- /dev/null
+++ b/gui.c
@@ -0,0 +1,65 @@
+
+
+/* mention the SDL2 documentation at http://wiki.libsdl.org/APIByCategory */
+
+
+#include <SDL2/SDL.h>
+#include <stdbool.h>
+
+
+void gui_run(void) {
+
+	bool quit = false;
+	SDL_Event event;
+	SDL_Window* window;
+	SDL_Renderer* renderer;
+	SDL_Texture* texture;
+	uint32_t* pixels;
+
+	// init SDL2 and create window
+	SDL_Init(SDL_INIT_VIDEO);
+	window = SDL_CreateWindow("LimoX",
+	    SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480,
+	    0
+	);
+
+	// output video driver to stderr
+	fprintf(stderr, "SDL2 video driver: %s\n", SDL_GetCurrentVideoDriver());
+
+	// create and initialize renderer, texture and pixel buffer
+	renderer = SDL_CreateRenderer(window, -1, 0);
+	texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888,
+	                            SDL_TEXTUREACCESS_STATIC, 640, 480);
+	pixels = malloc(sizeof(uint32_t) * 640 * 480);
+	memset(pixels, 255, 640 * 480 * sizeof(uint32_t));
+
+	// handle failed window creation
+	if (window == NULL) {
+		fprintf(stderr, "Failed to create SDL2 window!\n");
+		return;
+	} else {
+		while (!quit) {
+			SDL_UpdateTexture(texture, NULL, pixels, 640 * sizeof(uint32_t));
+			SDL_WaitEvent(&event);
+			switch (event.type)
+			{
+				case SDL_QUIT:
+					quit = true;
+					break;
+			}
+			SDL_RenderClear(renderer);
+			SDL_RenderCopy(renderer, texture, NULL, NULL);
+			SDL_RenderPresent(renderer);
+		}
+		SDL_DestroyWindow(window);
+	}
+
+	free(pixels);
+
+	// TODO this seems to end in memory access errors but ... why?
+	//SDL_DestroyTexture(texture);
+	//SDL_DestroyRenderer(renderer);
+
+	SDL_Quit();
+
+}