293 lines
7.0 KiB
C
293 lines
7.0 KiB
C
/* Blackfin GUI (SDL) helper code
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Copyright (C) 2010-2020 Free Software Foundation, Inc.
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Contributed by Analog Devices, Inc.
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This file is part of simulators.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "config.h"
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#ifdef HAVE_SDL
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# include <SDL.h>
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#endif
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#ifdef HAVE_DLFCN_H
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# include <dlfcn.h>
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#endif
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#include "libiberty.h"
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#include "gui.h"
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#ifdef HAVE_SDL
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static struct {
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void *handle;
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int (*Init) (Uint32 flags);
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void (*Quit) (void);
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SDL_Surface *(*SetVideoMode) (int width, int height, int bpp, Uint32 flags);
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void (*WM_SetCaption) (const char *title, const char *icon);
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int (*ShowCursor) (int toggle);
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int (*LockSurface) (SDL_Surface *surface);
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void (*UnlockSurface) (SDL_Surface *surface);
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void (*GetRGB) (Uint32 pixel, const SDL_PixelFormat * const fmt, Uint8 *r, Uint8 *g, Uint8 *b);
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Uint32 (*MapRGB) (const SDL_PixelFormat * const format, const Uint8 r, const Uint8 g, const Uint8 b);
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void (*UpdateRect) (SDL_Surface *screen, Sint32 x, Sint32 y, Uint32 w, Uint32 h);
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} sdl;
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static const char * const sdl_syms[] =
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{
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"SDL_Init",
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"SDL_Quit",
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"SDL_SetVideoMode",
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"SDL_WM_SetCaption",
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"SDL_ShowCursor",
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"SDL_LockSurface",
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"SDL_UnlockSurface",
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"SDL_GetRGB",
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"SDL_MapRGB",
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"SDL_UpdateRect",
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};
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struct gui_state {
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SDL_Surface *screen;
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const SDL_PixelFormat *format;
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int throttle, throttle_limit;
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enum gui_color color;
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int curr_line;
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};
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/* Load the SDL lib on the fly to avoid hard linking against it. */
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static int
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bfin_gui_sdl_setup (void)
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{
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int i;
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uintptr_t **funcs;
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if (sdl.handle)
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return 0;
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sdl.handle = dlopen ("libSDL-1.2.so.0", RTLD_LAZY);
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if (sdl.handle == NULL)
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return -1;
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funcs = (void *) &sdl.Init;
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for (i = 0; i < ARRAY_SIZE (sdl_syms); ++i)
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{
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funcs[i] = dlsym (sdl.handle, sdl_syms[i]);
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if (funcs[i] == NULL)
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{
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dlclose (sdl.handle);
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sdl.handle = NULL;
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return -1;
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}
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}
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return 0;
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}
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static const SDL_PixelFormat *bfin_gui_color_format (enum gui_color color);
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void *
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bfin_gui_setup (void *state, int enabled, int width, int height,
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enum gui_color color)
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{
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if (bfin_gui_sdl_setup ())
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return NULL;
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/* Create an SDL window if enabled and we don't have one yet. */
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if (enabled && !state)
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{
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struct gui_state *gui = xmalloc (sizeof (*gui));
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if (!gui)
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return NULL;
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if (sdl.Init (SDL_INIT_VIDEO))
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goto error;
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gui->color = color;
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gui->format = bfin_gui_color_format (gui->color);
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gui->screen = sdl.SetVideoMode (width, height, 32,
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SDL_ANYFORMAT|SDL_HWSURFACE);
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if (!gui->screen)
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{
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sdl.Quit();
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goto error;
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}
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sdl.WM_SetCaption ("GDB Blackfin Simulator", NULL);
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sdl.ShowCursor (0);
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gui->curr_line = 0;
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gui->throttle = 0;
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gui->throttle_limit = 0xf; /* XXX: let people control this ? */
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return gui;
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error:
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free (gui);
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return NULL;
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}
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/* Else break down a window if disabled and we had one. */
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else if (!enabled && state)
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{
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sdl.Quit();
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free (state);
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return NULL;
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}
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/* Retain existing state, whatever that may be. */
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return state;
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}
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static int
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SDL_ConvertBlitLineFrom (const Uint8 *src, const SDL_PixelFormat * const format,
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SDL_Surface *dst, int dsty)
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{
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Uint8 r, g, b;
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Uint32 *pixels;
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unsigned i, j;
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if (SDL_MUSTLOCK (dst))
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if (sdl.LockSurface (dst))
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return 1;
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pixels = dst->pixels;
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pixels += (dsty * dst->pitch / 4);
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for (i = 0; i < dst->w; ++i)
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{
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/* Exract the packed source pixel; RGB or BGR. */
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Uint32 pix = 0;
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for (j = 0; j < format->BytesPerPixel; ++j)
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if (format->Rshift)
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pix = (pix << 8) | src[j];
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else
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pix = pix | ((Uint32)src[j] << (j * 8));
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/* Unpack the source pixel into its components. */
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sdl.GetRGB (pix, format, &r, &g, &b);
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/* Translate into the screen pixel format. */
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*pixels++ = sdl.MapRGB (dst->format, r, g, b);
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src += format->BytesPerPixel;
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}
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if (SDL_MUSTLOCK (dst))
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sdl.UnlockSurface (dst);
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sdl.UpdateRect (dst, 0, dsty, dst->w, 1);
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return 0;
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}
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unsigned
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bfin_gui_update (void *state, const void *source, unsigned nr_bytes)
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{
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struct gui_state *gui = state;
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int ret;
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if (!gui)
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return 0;
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/* XXX: Make this an option ? */
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gui->throttle = (gui->throttle + 1) & gui->throttle_limit;
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if (gui->throttle)
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return 0;
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ret = SDL_ConvertBlitLineFrom (source, gui->format, gui->screen,
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gui->curr_line);
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if (ret)
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return 0;
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gui->curr_line = (gui->curr_line + 1) % gui->screen->h;
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return nr_bytes;
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}
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#define FMASK(cnt, shift) (((1 << (cnt)) - 1) << (shift))
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#define _FORMAT(bpp, rcnt, gcnt, bcnt, acnt, rsh, gsh, bsh, ash) \
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NULL, bpp, (bpp)/8, 8-(rcnt), 8-(gcnt), 8-(bcnt), 8-(acnt), rsh, gsh, bsh, ash, \
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FMASK (rcnt, rsh), FMASK (gcnt, gsh), FMASK (bcnt, bsh), FMASK (acnt, ash),
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#define FORMAT(rcnt, gcnt, bcnt, acnt, rsh, gsh, bsh, ash) \
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_FORMAT(((((rcnt) + (gcnt) + (bcnt) + (acnt)) + 7) / 8) * 8, \
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rcnt, gcnt, bcnt, acnt, rsh, gsh, bsh, ash)
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static const SDL_PixelFormat sdl_rgb_565 =
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{
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FORMAT (5, 6, 5, 0, 11, 5, 0, 0)
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};
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static const SDL_PixelFormat sdl_bgr_565 =
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{
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FORMAT (5, 6, 5, 0, 0, 5, 11, 0)
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};
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static const SDL_PixelFormat sdl_rgb_888 =
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{
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FORMAT (8, 8, 8, 0, 16, 8, 0, 0)
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};
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static const SDL_PixelFormat sdl_bgr_888 =
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{
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FORMAT (8, 8, 8, 0, 0, 8, 16, 0)
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};
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static const SDL_PixelFormat sdl_rgba_8888 =
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{
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FORMAT (8, 8, 8, 8, 24, 16, 8, 0)
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};
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static const struct {
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const char *name;
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const SDL_PixelFormat *format;
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enum gui_color color;
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} color_spaces[] = {
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{ "rgb565", &sdl_rgb_565, GUI_COLOR_RGB_565, },
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{ "bgr565", &sdl_bgr_565, GUI_COLOR_BGR_565, },
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{ "rgb888", &sdl_rgb_888, GUI_COLOR_RGB_888, },
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{ "bgr888", &sdl_bgr_888, GUI_COLOR_BGR_888, },
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{ "rgba8888", &sdl_rgba_8888, GUI_COLOR_RGBA_8888, },
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};
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enum gui_color bfin_gui_color (const char *color)
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{
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int i;
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if (!color)
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goto def;
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for (i = 0; i < ARRAY_SIZE (color_spaces); ++i)
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if (!strcmp (color, color_spaces[i].name))
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return color_spaces[i].color;
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/* Pick a random default. */
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def:
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return GUI_COLOR_RGB_888;
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}
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static const SDL_PixelFormat *bfin_gui_color_format (enum gui_color color)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE (color_spaces); ++i)
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if (color == color_spaces[i].color)
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return color_spaces[i].format;
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return NULL;
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}
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int bfin_gui_color_depth (enum gui_color color)
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{
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const SDL_PixelFormat *format = bfin_gui_color_format (color);
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return format ? format->BitsPerPixel : 0;
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}
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#endif
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