kc3-lang/SDL/src/video/riscos/SDL_riscosframebuffer.c

Branch : - branch - v2.28 - tag -

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• Author : Sam Lantinga
  Date : 2022-01-03 09:40:00
  Hash : 120c76c8
  Message : Updated copyright for 2022

• src/video/riscos/SDL_riscosframebuffer.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "../../SDL_internal.h"
  
  #if SDL_VIDEO_DRIVER_RISCOS
  
  #include "../SDL_sysvideo.h"
  #include "SDL_riscosframebuffer_c.h"
  #include "SDL_riscosvideo.h"
  #include "SDL_riscoswindow.h"
  
  #include <kernel.h>
  #include <swis.h>
  
  int RISCOS_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch)
  {
      SDL_WindowData *driverdata = (SDL_WindowData *) window->driverdata;
      const char *sprite_name = "display";
      unsigned int sprite_mode;
      _kernel_oserror *error;
      _kernel_swi_regs regs;
      SDL_DisplayMode mode;
      int size;
  
      /* Free the old framebuffer surface */
      RISCOS_DestroyWindowFramebuffer(_this, window);
  
      /* Create a new one */
      SDL_GetCurrentDisplayMode(SDL_GetWindowDisplayIndex(window), &mode);
      if ((SDL_ISPIXELFORMAT_PACKED(mode.format) || SDL_ISPIXELFORMAT_ARRAY(mode.format))) {
          *format = mode.format;
          sprite_mode = (unsigned int)mode.driverdata;
      } else {
          *format = SDL_PIXELFORMAT_BGR888;
          sprite_mode = (1 | (90 << 1) | (90 << 14) | (6 << 27));
      }
  
      /* Calculate pitch */
      *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
  
      /* Allocate the sprite area */
      size = sizeof(sprite_area) + sizeof(sprite_header) + ((*pitch) * window->h);
      driverdata->fb_area = SDL_malloc(size);
      if (!driverdata->fb_area) {
          return SDL_OutOfMemory();
      }
  
      driverdata->fb_area->size  = size;
      driverdata->fb_area->count = 0;
      driverdata->fb_area->start = 16;
      driverdata->fb_area->end   = 16;
  
      /* Create the actual image */
      regs.r[0] = 256+15;
      regs.r[1] = (int)driverdata->fb_area;
      regs.r[2] = (int)sprite_name;
      regs.r[3] = 0;
      regs.r[4] = window->w;
      regs.r[5] = window->h;
      regs.r[6] = sprite_mode;
      error = _kernel_swi(OS_SpriteOp, &regs, &regs);
      if (error != NULL) {
          SDL_free(driverdata->fb_area);
          return SDL_SetError("Unable to create sprite: %s (%i)", error->errmess, error->errnum);
      }
  
      driverdata->fb_sprite = (sprite_header *)(((Uint8 *)driverdata->fb_area) + driverdata->fb_area->start);
      *pixels = ((Uint8 *)driverdata->fb_sprite) + driverdata->fb_sprite->image_offset;
  
      return 0;
  }
  
  int RISCOS_UpdateWindowFramebuffer(_THIS, SDL_Window * window, const SDL_Rect * rects, int numrects)
  {
      SDL_WindowData *driverdata = (SDL_WindowData *) window->driverdata;
      _kernel_swi_regs regs;
      _kernel_oserror *error;
  
      regs.r[0] = 512+52;
      regs.r[1] = (int)driverdata->fb_area;
      regs.r[2] = (int)driverdata->fb_sprite;
      regs.r[3] = 0; /* window->x << 1; */
      regs.r[4] = 0; /* window->y << 1; */
      regs.r[5] = 0x50;
      regs.r[6] = 0;
      regs.r[7] = 0;
      error = _kernel_swi(OS_SpriteOp, &regs, &regs);
      if (error != NULL) {
          return SDL_SetError("OS_SpriteOp 52 failed: %s (%i)", error->errmess, error->errnum);
      }
  
      return 0;
  }
  
  void RISCOS_DestroyWindowFramebuffer(_THIS, SDL_Window * window)
  {
      SDL_WindowData *driverdata = (SDL_WindowData *) window->driverdata;
  
      if (driverdata->fb_area) {
          SDL_free(driverdata->fb_area);
          driverdata->fb_area = NULL;
      }
      driverdata->fb_sprite = NULL;
  }
  
  #endif /* SDL_VIDEO_DRIVER_RISCOS */
  
  /* vi: set ts=4 sw=4 expandtab: */