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/*
 * Modified from hpcFB.c of Xhpc
 */

#include "dreamcast.h"

#define FORCE_SEPARATE_PRIVATE
#include "mi.h"
#include "cfb.h"
#include "cfb16.h"

#include <stdio.h>

#undef CFB_NEED_SCREEN_PRIVATE
extern int cfb16ScreenPrivateIndex;
extern Bool cfb16CreateScreenResources(ScreenPtr pScreen);


static Bool
dreamcast16ScreenInit(ScreenPtr pScreen, pointer pbits, int xsize, int ysize,
    int dpix, int dpiy, int width)
    /* pointer pbits;		pointer to screen bitmap */
    /* int xsize, ysize;	in pixels */
    /* int dpix, dpiy;		dots per inch */
    /* int width;		pixel width of frame buffer */
{
#ifdef CFB_NEED_SCREEN_PRIVATE
    pointer oldDevPrivate;
#endif
    VisualPtr	visuals = NULL;
    DepthPtr	depths = NULL;
    int		nvisuals;
    int		ndepths;
    int		rootdepth;
    VisualID	defaultVisual = 0;
    dreamcastFbPtr pFb = dreamcastGetScreenFb(pScreen);
    struct wsdisplay_fbinfo *fbconf = &pFb->info;
    extern Bool cfb16CloseScreen(int index, ScreenPtr pScreen);

    if (!cfb16SetupScreen(pScreen, pbits, xsize, ysize, dpix, dpiy, width))
	return FALSE;

    /*
     * fbconf->hf_pixel_width == 16 is always true
     * because here is dreamcast16FinishScreenInit, dreamcast16 !
     */
    if (fbconf->depth == 16) {
        VisualID *vid = NULL;

        ndepths = 1;
        nvisuals = 1;
        depths = (DepthPtr)xalloc( sizeof(DepthRec) );
        visuals = (VisualPtr)xalloc( sizeof(VisualRec) );
        vid = (VisualID *)xalloc( sizeof(VisualID) );
        if( !depths || !visuals || !vid ) {
            xfree( depths );
            xfree( visuals );
            xfree( vid );
            return FALSE;
        }
        depths[0].depth = 16;
        depths[0].numVids = 1;
        depths[0].vids = vid;
        visuals[0].class = TrueColor;
        visuals[0].bitsPerRGBValue = 6;
        visuals[0].ColormapEntries = 1 << 6;
        visuals[0].nplanes = 16;
        visuals[0].vid = *vid = FakeClientID(0);
        visuals[0].redMask   = 0xf800;
        visuals[0].greenMask = 0x07e0;
        visuals[0].blueMask  = 0x001f;
        visuals[0].offsetRed   = 11;
        visuals[0].offsetGreen = 6;
        visuals[0].offsetBlue  = 0;
        rootdepth = 16;
        defaultVisual = *vid;
    }

#ifdef CFB_NEED_SCREEN_PRIVATE
    oldDevPrivate = pScreen->devPrivate;
#endif
    if (! miScreenInit(pScreen, pbits, xsize, ysize, dpix, dpiy, width,
			rootdepth, ndepths, depths,
			defaultVisual, nvisuals, visuals))
	return FALSE;

    /* overwrite miCloseScreen with our own */
    pScreen->CloseScreen = cfb16CloseScreen;

    /* init backing store here so we can overwrite CloseScreen without stepping
     * on the backing store wrapped version */
    miInitializeBackingStore (pScreen);

#ifdef CFB_NEED_SCREEN_PRIVATE
    pScreen->CreateScreenResources = cfb16CreateScreenResources;
    pScreen->devPrivates[cfb16ScreenPrivateIndex].ptr = pScreen->devPrivate;
    pScreen->devPrivate = oldDevPrivate;
#endif
    return TRUE;
}

int
dreamcastSetDisplayMode(fd, mode, prevmode)
	int fd;
	int mode;
	int *prevmode;
{
    if (prevmode != NULL) {
	if (ioctl(fd, WSDISPLAYIO_GMODE, prevmode) < 0) {
	    dreamcastError("ioctl(WSDISPLAYIO_GMODE)");
	    return (-1);
	}
    }

    if (prevmode == NULL || *prevmode != mode) {
	    if (ioctl(fd, WSDISPLAYIO_SMODE, &mode) < 0) {
		dreamcastError("ioctl(WSDISPLAYIO_SMODE)");
		return (-1);
	    }
    }

    return (0);
}

Bool
dreamcastFBInit(screen, pScreen, argc, argv)
    int	    	  screen;    	/* what screen am I going to be */
    ScreenPtr	  pScreen;  	/* The Screen to initialize */
    int	    	  argc;	    	/* The number of the Server's arguments. */
    char    	  **argv;   	/* The arguments themselves. Don't change! */
{
	int res;
	dreamcastFbPtr pFb = dreamcastGetScreenFb(pScreen);
	unsigned char *fb = pFb->fb;
	struct wsdisplay_fbinfo *fbconf = &pFb->info;

	pFb->EnterLeave = (void *)NoopDDA;

	if (!dreamcastAllocateScreenPrivate(pScreen))
	    return FALSE;

	if (!fb) {
            if (ioctl(pFb->fd, WSDISPLAYIO_GINFO, fbconf) < 0) {
                dreamcastError("ioctl(WSDISPLAYIO_GINFO)");
                return FALSE;
            }


	    if (dreamcastSetDisplayMode(pFb->fd, WSDISPLAYIO_MODE_MAPPED, NULL) < 0)
		return FALSE;

	    fb = dreamcastMemoryMap((size_t)fbconf->width * fbconf->height *fbconf->depth/8,
			      0, pFb->fd);
	    if (fb == NULL)
		return FALSE;

	    pFb->fb = fb;
	}

	switch (fbconf->depth) {
	case 16:
	    res = dreamcast16ScreenInit(pScreen, fb,
				  fbconf->width,
				  fbconf->height,
				  monitorResolution, monitorResolution,
				  fbconf->width);
		break;
	default:
		dreamcastErrorF(("%dbpp frame buffer is not supported\n",
		    fbconf->depth));
		return FALSE;
	}

	if (!res) return FALSE;

	/*
	 * It seems that backing store can't work.
	 */
	pScreen->backingStoreSupport = NotUseful;

	dreamcastColormapInit(pScreen);

	if (!dreamcastScreenInit(pScreen))
		return FALSE;
	(void) (*pScreen->SaveScreen) (pScreen, SCREEN_SAVER_OFF);

	res = cfbCreateDefColormap(pScreen);

	return res;
}