shithub: microui

ref: 0b64933b08bbfa485c7142c97d33ff3d47f83342
dir: /demo/sdl2.c/

#include <SDL2/SDL.h>
#include "common.h"

#define unused(x) ((void) (x))

static const char button_map[256] = {
  [ SDL_BUTTON_LEFT   & 0xff ] =  MU_MOUSE_LEFT,
  [ SDL_BUTTON_RIGHT  & 0xff ] =  MU_MOUSE_RIGHT,
  [ SDL_BUTTON_MIDDLE & 0xff ] =  MU_MOUSE_MIDDLE,
};

static const char key_map[256] = {
  [ SDLK_LSHIFT       & 0xff ] = MU_KEY_SHIFT,
  [ SDLK_RSHIFT       & 0xff ] = MU_KEY_SHIFT,
  [ SDLK_LCTRL        & 0xff ] = MU_KEY_CTRL,
  [ SDLK_RCTRL        & 0xff ] = MU_KEY_CTRL,
  [ SDLK_LALT         & 0xff ] = MU_KEY_ALT,
  [ SDLK_RALT         & 0xff ] = MU_KEY_ALT,
  [ SDLK_RETURN       & 0xff ] = MU_KEY_RETURN,
  [ SDLK_BACKSPACE    & 0xff ] = MU_KEY_BACKSPACE,
};


int main(int argc, char **argv) {
  mu_Font dummy = {0};

  unused(argc); unused(argv);

  /* init SDL and renderer */
  SDL_Init(SDL_INIT_EVERYTHING);
  r_init();

  /* init microui */
  mu_Context *ctx = malloc(sizeof(mu_Context));
  mu_init(ctx);
  ctx->text_width = r_get_text_width;
  ctx->text_height = r_get_text_height;

  /* main loop */
  for (;;) {
    /* handle SDL events */
    SDL_Event e;
    while (SDL_PollEvent(&e)) {
      switch (e.type) {
        case SDL_QUIT: exit(EXIT_SUCCESS); break;
        case SDL_MOUSEMOTION: mu_input_mousemove(ctx, e.motion.x, e.motion.y); break;
        case SDL_MOUSEWHEEL: mu_input_scroll(ctx, 0, e.wheel.y * -30); break;
        case SDL_TEXTINPUT: mu_input_text(ctx, e.text.text); break;

        case SDL_MOUSEBUTTONDOWN:
        case SDL_MOUSEBUTTONUP: {
          int b = button_map[e.button.button & 0xff];
          if (b && e.type == SDL_MOUSEBUTTONDOWN) { mu_input_mousedown(ctx, e.button.x, e.button.y, b); }
          if (b && e.type ==   SDL_MOUSEBUTTONUP) { mu_input_mouseup(ctx, e.button.x, e.button.y, b);   }
          break;
        }

        case SDL_KEYDOWN:
        case SDL_KEYUP: {
          int c = key_map[e.key.keysym.sym & 0xff];
          if (c && e.type == SDL_KEYDOWN) { mu_input_keydown(ctx, c); }
          if (c && e.type ==   SDL_KEYUP) { mu_input_keyup(ctx, c);   }
          break;
        }
      }
    }

    /* process frame */
    process_frame(ctx);

    /* render */
    r_clear(mu_color(bg[0], bg[1], bg[2], 255));
    mu_Command *cmd = NULL;
    while (mu_next_command(ctx, &cmd)) {
      switch (cmd->type) {
        case MU_COMMAND_TEXT: r_draw_text(dummy, cmd->text.str, cmd->text.pos, cmd->text.color); break;
        case MU_COMMAND_RECT: r_draw_rect(cmd->rect.rect, cmd->rect.color); break;
        case MU_COMMAND_ICON: r_draw_icon(cmd->icon.id, cmd->icon.rect, cmd->icon.color); break;
        case MU_COMMAND_CLIP: r_set_clip_rect(cmd->clip.rect); break;
      }
    }
    r_present();
  }

  return 0;
}