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#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;
}
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