Create simple red rect controlled by arrow keys

Signed-off-by: Fabio Maciel <fabiomsdev@gmail.com>
Co-authored-by: Johnny Richard <johnny@johnnyrichard.com>

4 files changed, 130 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f18d57b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.exe
+main
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..5d398f2
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,20 @@
+.PHONY: build clean run
+
+CFLAGS := -Wall
+
+ifeq ($(OS),Windows_NT)
+	CC := gcc
+	CFLAGS +=	-lmingw32 -lSDL2main -lSDL2 \
+		-IG:\dev\mingw\include\SDL2
+else
+	CFLAGS += -Wall $(shell pkg-config sdl2 --cflags --libs)
+endif
+
+build:
+	$(CC) src/main.c -o main $(CFLAGS)  
+
+clean:
+	rm ./game;
+
+run:
+	./game;
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..0f4e4bc
--- /dev/null
+++ b/README.md
@@ -0,0 +1,2 @@
+Game
+====
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..022a888
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,106 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <SDL.h>
+
+const int SCREEN_WIDTH  = 640;
+const int SCREEN_HEIGHT = 480;
+
+typedef struct Controller {
+  bool up;
+  bool down;
+  bool left;
+  bool right;
+} Controller;
+
+int 
+main (int   argc,
+      char *args[])
+{
+  SDL_Window*  window        = NULL;
+  SDL_Surface* screenSurface = NULL;
+
+  if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+    fprintf(stderr, "SDL could not initialize! SDL_Error: %s\n", SDL_GetError());
+    return EXIT_FAILURE;
+  }
+
+  window = SDL_CreateWindow(
+      "SDL Tutorial", 
+      SDL_WINDOWPOS_UNDEFINED, 
+      SDL_WINDOWPOS_UNDEFINED, 
+      SCREEN_WIDTH, SCREEN_HEIGHT, 
+      SDL_WINDOW_SHOWN
+  );
+
+  if (window == NULL) {
+    fprintf(stderr, "Window could not be created! SDL_Error: %s\n", SDL_GetError());
+    return EXIT_FAILURE;
+  }
+  
+  SDL_Rect rect = { .x = 0, .y = 0, .w = 20, .h = 20 };
+
+  bool quit = false;
+  Controller controller = {0};
+
+  while (!quit) {
+    screenSurface = SDL_GetWindowSurface(window);
+    SDL_FillRect(screenSurface, NULL, SDL_MapRGB(screenSurface->format, 0xFF, 0xFF, 0xFF));
+
+    SDL_Event event;
+    while (SDL_PollEvent(&event) != 0) { 
+      if (event.type == SDL_QUIT) {
+        quit = true;
+      }
+      
+      if (event.type == SDL_KEYDOWN) {
+        switch (event.key.keysym.sym) {
+          case SDLK_UP:
+          controller.up = true;
+          break;
+          case SDLK_DOWN:
+          controller.down = true;
+          break;
+          case SDLK_LEFT:
+          controller.left = true;
+          break;
+          case SDLK_RIGHT:
+          controller.right = true;
+          break;
+        }
+      }
+
+      if (event.type == SDL_KEYUP) {
+        switch (event.key.keysym.sym) {
+          case SDLK_UP:
+          controller.up = false;
+          break;
+
+          case SDLK_DOWN:
+          controller.down = false;
+          break;
+
+          case SDLK_LEFT:
+          controller.left = false;
+          break;
+
+          case SDLK_RIGHT:
+          controller.right = false;
+          break;
+        }
+      }
+    }
+
+    if (controller.up)    rect.y -= 1;
+    if (controller.down)  rect.y += 1;
+    if (controller.left)  rect.x -= 1;
+    if (controller.right) rect.x += 1;
+
+    SDL_FillRect(screenSurface, &rect, SDL_MapRGB(screenSurface->format, 0xFF, 0x0, 0x0));
+    SDL_UpdateWindowSurface(window);
+  }
+
+  SDL_DestroyWindow(window);
+  SDL_Quit();
+  return EXIT_SUCCESS;
+}