1 files changed, 131 insertions, 0 deletions
diff --git a/sdl.c b/sdl.c
new file mode 100644
index 0000000..bc75984
--- /dev/null
+++ b/sdl.c
@@ -0,0 +1,131 @@
+#include <SDL2/SDL.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define WIDTH 640
+#define HEIGHT 480
+#define DEPTH 32
+
+enum obj_type {
+	O_QUAD,
+	O_TRIG,
+	O_CIRC
+};
+
+struct quad {
+	uint32_t x, y, width, height;
+};
+
+struct circle {
+	uint32_t x, y, diameter;
+};
+
+typedef union colour_t {
+	struct {
+		uint8_t a, r, g, b;
+	} comp;
+	uint32_t colour;
+} colour_t;
+
+struct object {
+	enum obj_type type;
+	colour_t colour;
+	union {
+		struct quad quad;
+		struct circle circle;
+	} obj;
+};
+
+SDL_Window *window;
+SDL_Renderer *renderer;
+SDL_Texture *screen;
+colour_t *buffer;
+
+struct object *objects;
+uint32_t object_count;
+
+volatile bool running = true;
+
+#define QUOTE(text) "`" #text "'"
+#define SDL_ASSERT(expr, comp, val) \
+	if ((expr) comp val) { \
+		fprintf(stderr, "SDL Error: %s - %s\n", QUOTE(expr), SDL_GetError()); \
+		exit(EXIT_FAILURE); \
+	}
+
+#define SDL_ASSERT_NN(expr) SDL_ASSERT(expr, ==, NULL)
+#define SDL_ASSERT_Z(expr) SDL_ASSERT(expr, !=, 0)
+
+void prep_objects()
+{
+	objects = malloc(1 * sizeof *objects);
+	objects[0] = (struct object){O_QUAD, {{255, 0, 0, 0}}, {.quad = {30, 30, 30, 30}}};
+
+	object_count = 1;
+}
+
+void draw_screen()
+{
+	for (size_t i = 0; i < WIDTH * HEIGHT; i++)
+		buffer[i] = (colour_t){{0, 255, 0, 0}};
+
+	SDL_UpdateTexture(screen, NULL, buffer, 640 * sizeof *buffer);
+	SDL_RenderClear(renderer);
+	SDL_RenderCopy(renderer, screen, NULL, NULL);
+	SDL_RenderPresent(renderer);
+}
+
+void poll_for_events()
+{
+	SDL_Event event;
+
+	while (SDL_PollEvent(&event)) {
+		switch (event.type) {
+		case SDL_QUIT:
+			exit(EXIT_SUCCESS);
+			break;
+		case SDL_KEYDOWN:
+			printf("Key.\n");
+			break;
+		}
+	}
+}
+
+void simulate(uint32_t difference)
+{
+	printf("%lu\n", difference);
+}
+
+uint32_t get_time_delta()
+{
+	static uint32_t old_time;
+	uint32_t time = SDL_GetTicks();
+	uint32_t difference = time - old_time;
+	old_time = time;
+	return difference;
+}
+
+int main(void)
+{
+	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
+	atexit(SDL_Quit);
+
+	window = SDL_CreateWindow("Test", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_OPENGL);
+	renderer = SDL_CreateRenderer(window, -1, 0);
+	screen = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, 640, 480);
+	buffer = malloc(sizeof *buffer * 640 * 480);
+
+	prep_objects();
+
+	get_time_delta();
+
+	while (running) {
+		draw_screen();
+		poll_for_events();
+		simulate(get_time_delta());
+	}
+
+	return(EXIT_SUCCESS);
+}