MODULE renderer_demo ;

(*
   m2SDL3 example: renderer basics - clear, colored rects, present.
   Uses SDL_CreateWindowAndRenderer (title, w, h, flags) and the
   float SDLFRect records; colors are Uint8 CARDINAL8 values.
   Run: ./build/examples/renderer_demo (auto-quits after 3 s).
*)

FROM SYSTEM IMPORT CARDINAL8;
FROM SDL3 IMPORT SDL_Init, SDL_Quit, SDL_Delay, SDL_GetTicks,
   SDLInitVideo;
FROM SDL3Video IMPORT WindowHandle, WindowResizable, SDL_DestroyWindow;
FROM SDL3Render IMPORT RendererHandle, SDL_CreateWindowAndRenderer,
   SDL_DestroyRenderer, SDL_SetRenderDrawColor,
   SDL_RenderClear, SDL_RenderPresent, SDL_RenderFillRect,
   SDL_SetRenderLogicalPresentation, LogicalLetterbox;
FROM SDL3Rect IMPORT SDLFRect, MakeFRect;
FROM SDL3Utils IMPORT DrainEvents;
FROM libc IMPORT printf;

VAR
   win: WindowHandle;
   ren: RendererHandle;
   r: SDLFRect;
   quit: BOOLEAN;
   start: LONGCARD;

BEGIN
   IF NOT SDL_Init(SDLInitVideo) THEN
      printf("renderer_demo: SDL_Init failed\n");
      HALT(1)
   END;
   IF NOT SDL_CreateWindowAndRenderer("m2SDL3 renderer demo",
                                      640, 480,
                                      VAL(LONGCARD, WindowResizable),
                                      win, ren) THEN
      printf("renderer_demo: CreateWindowAndRenderer failed\n");
      SDL_Quit;
      HALT(1)
   END;
   IF NOT SDL_SetRenderLogicalPresentation(ren, 640, 480,
                                           LogicalLetterbox) THEN
      printf("renderer_demo: logical presentation failed\n")
   END;

   quit := FALSE;
   start := SDL_GetTicks();
   WHILE NOT quit DO
      DrainEvents(quit);
      SDL_SetRenderDrawColor(ren, VAL(CARDINAL8, 20), VAL(CARDINAL8, 20),
                             VAL(CARDINAL8, 40), VAL(CARDINAL8, 255));
      SDL_RenderClear(ren);
      r := MakeFRect(VAL(SHORTREAL, 100.0), VAL(SHORTREAL, 100.0),
                     VAL(SHORTREAL, 200.0), VAL(SHORTREAL, 150.0));
      SDL_SetRenderDrawColor(ren, VAL(CARDINAL8, 0), VAL(CARDINAL8, 200),
                             VAL(CARDINAL8, 0), VAL(CARDINAL8, 255));
      SDL_RenderFillRect(ren, r);
      r := MakeFRect(VAL(SHORTREAL, 350.0), VAL(SHORTREAL, 200.0),
                     VAL(SHORTREAL, 150.0), VAL(SHORTREAL, 100.0));
      SDL_SetRenderDrawColor(ren, VAL(CARDINAL8, 200), VAL(CARDINAL8, 0),
                             VAL(CARDINAL8, 0), VAL(CARDINAL8, 255));
      SDL_RenderFillRect(ren, r);
      SDL_RenderPresent(ren);
      IF SDL_GetTicks() - start > 3000 THEN quit := TRUE END;
      SDL_Delay(16)
   END;

   SDL_DestroyRenderer(ren);
   SDL_DestroyWindow(win);
   SDL_Quit;
   printf("renderer_demo: bye\n")
END renderer_demo.