Update entry point

.gitignore

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+.cache
+compile_commands.json
+main

.gitmodules

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+[submodule "intern/aliases"]
+	path = intern/aliases
+	url = https://git.thewizardapprentice.com/abdelrahman/c-cpp-aliases.git

README.md

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+# SDL Boilerplate
+
+Boilerplate for setting up a simple SDL program that creates a window and a renderer and handles the quit event.

build

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+#!/bin/bash
+
+bear -- ./compile $@

compile

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+#!/bin/bash
+
+CC=clang
+CFLAGS="-g -Wall -Iinclude -Iintern $(pkg-config --cflags sdl2)"
+LIBS="$(pkg-config --libs sdl2)"
+SRC=src/*.c
+OUT=main
+
+(set -x ; $CC $CFLAGS $LIBS $SRC -o $OUT)

include/compositor.h

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+#ifndef COMPOSITOR_H
+#define COMPOSITOR_H
+
+#include "aliases/aliases.h"
+
+i32 run_main_loop(void);
+
+#endif // !COMPOSITOR_H

include/window.h

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+#ifndef WINDOW_H
+#define WINDOW_H
+
+#include "SDL_pixels.h"
+#include "aliases/aliases.h"
+#include <SDL2/SDL_render.h>
+#include <SDL2/SDL_video.h>
+#include <stdbool.h>
+
+typedef struct point point_t;
+typedef struct line line_t;
+typedef struct triangle triangle_t;
+typedef struct window window_t;
+
+struct point {
+  i32 x;
+  i32 y;
+};
+
+struct line {
+  point_t p0;
+  point_t p1;
+};
+
+struct triangle {
+  point_t p0;
+  point_t p1;
+  point_t p2;
+};
+
+struct window {
+  u64 width;
+  u64 height;
+  const char *title;
+  SDL_Window *window;
+  SDL_Renderer *renderer;
+};
+
+typedef struct colour colour_t;
+struct colour {
+  union {
+    u32 abgr;
+    SDL_Color colour;
+  };
+};
+
+bool init_window(window_t *wnd, const char *title, u64 width, u64 height);
+void cleanup_window(window_t *wnd);
+void clear_window(const window_t *wnd, colour_t colour);
+void swap_buffers(const window_t *wnd);
+void draw_point(const window_t *wnd, point_t p, colour_t colour);
+void draw_line(const window_t *wnd, const line_t *ln, colour_t colour);
+void draw_triangle(const window_t *wnd, const triangle_t *triangle,
+                   colour_t colour);
+
+#endif // !WINDOW_H

main.c

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-#include <SDL2/SDL.h>
-#include <SDL2/SDL_events.h>
-#include <SDL2/SDL_render.h>
-#include <SDL2/SDL_video.h>
-#include <stdbool.h>
-
-#define WINDOW_WIDTH 800
-#define WINDOW_HEIGHT 600
-
-int main(void) {
-  SDL_Init(SDL_INIT_EVERYTHING);
-
-  SDL_Window *window =
-      SDL_CreateWindow("Window", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
-                       WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_SHOWN);
-
-  SDL_Renderer *renderer = SDL_CreateRenderer(
-      window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
-
-  bool running = true;
-
-  SDL_Event event = {};
-
-  while (running) {
-    while (SDL_PollEvent(&event)) {
-      switch (event.type) {
-      case SDL_QUIT:
-        running = false;
-        break;
-      }
-    }
-
-    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
-
-    SDL_RenderClear(renderer);
-
-    SDL_RenderPresent(renderer);
-  }
-
-  SDL_DestroyRenderer(renderer);
-
-  SDL_DestroyWindow(window);
-
-  SDL_Quit();
-
-  return 0;
-}

src/compositor.c

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+#include "aliases/aliases.h"
+#include "window.h"
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_events.h>
+#include <SDL2/SDL_render.h>
+#include <SDL2/SDL_video.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#define MAX_WINDOWS 2
+
+#define WINDOW_WIDTH 800
+#define WINDOW_HEIGHT 600
+
+typedef struct compositor compositor_t;
+struct compositor {
+  window_t windows[MAX_WINDOWS];
+  bool running;
+  SDL_Event event;
+};
+
+i32 run_main_loop(void) {
+  if (SDL_Init(SDL_INIT_EVERYTHING) != 0) {
+    return EXIT_FAILURE;
+  }
+
+  compositor_t comp = {0};
+
+  window_t *main_window = &(comp.windows[0]);
+
+  if (!init_window(main_window, "Compositor", WINDOW_WIDTH, WINDOW_HEIGHT)) {
+    SDL_Quit();
+
+    return EXIT_FAILURE;
+  }
+
+  comp.running = true;
+
+  colour_t bg_colour = {.abgr = 0xffffffff};
+  colour_t fg_colour = {.abgr = 0xff000000};
+
+  while (comp.running) {
+    while (SDL_PollEvent(&(comp.event))) {
+      switch (comp.event.type) {
+      case SDL_QUIT:
+        comp.running = false;
+        break;
+      }
+    }
+
+    clear_window(main_window, bg_colour);
+
+    swap_buffers(main_window);
+  }
+
+  SDL_Quit();
+
+  return EXIT_SUCCESS;
+}

src/main.c

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+#include "aliases/aliases.h"
+#include "compositor.h"
+
+i32 main(void) { return run_main_loop(); }

src/window.c

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+#include "window.h"
+#include "SDL_render.h"
+#include "SDL_video.h"
+#include "aliases/aliases.h"
+#include <stdbool.h>
+
+bool init_window(window_t *wnd, const char *title, u64 width, u64 height) {
+  wnd->window =
+      SDL_CreateWindow(title, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
+                       width, height, SDL_WINDOW_SHOWN);
+  if (!(wnd->window)) {
+    return false;
+  }
+
+  wnd->renderer = SDL_CreateRenderer(
+      wnd->window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
+  if (!(wnd->renderer)) {
+    cleanup_window(wnd);
+    return false;
+  }
+
+  wnd->title = title;
+  wnd->width = width;
+  wnd->height = height;
+
+  return true;
+}
+
+void cleanup_window(window_t *wnd) {
+  if (wnd->renderer) {
+    SDL_DestroyRenderer(wnd->renderer);
+    wnd->renderer = NULL;
+  }
+
+  if (wnd->window) {
+    SDL_DestroyWindow(wnd->window);
+    wnd->window = NULL;
+  }
+
+  wnd->width = wnd->height = 0;
+}
+
+void set_colour(const window_t *wnd, colour_t colour) {
+  SDL_SetRenderDrawColor(wnd->renderer, colour.colour.r, colour.colour.g,
+                         colour.colour.b, colour.colour.a);
+}
+
+void clear_window(const window_t *wnd, colour_t colour) {
+  set_colour(wnd, colour);
+  SDL_RenderClear(wnd->renderer);
+}
+
+void swap_buffers(const window_t *wnd) { SDL_RenderPresent(wnd->renderer); }
+
+void draw_point(const window_t *wnd, point_t p, colour_t colour) {
+  set_colour(wnd, colour);
+  SDL_RenderDrawPoint(wnd->renderer, p.x, p.y);
+}
+
+void draw_line(const window_t *wnd, const line_t *ln, colour_t colour) {
+  set_colour(wnd, colour);
+  SDL_RenderDrawLine(wnd->renderer, ln->p0.x, ln->p0.y, ln->p1.x, ln->p1.y);
+}
+
+void draw_triangle(const window_t *wnd, const triangle_t *triangle,
+                   colour_t colour) {
+  line_t ln0 = {triangle->p0, triangle->p1};
+  line_t ln1 = {triangle->p0, triangle->p2};
+  line_t ln2 = {triangle->p1, triangle->p2};
+
+  draw_line(wnd, &ln0, colour);
+  draw_line(wnd, &ln1, colour);
+  draw_line(wnd, &ln2, colour);
+}