atimach64exa.c

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    int       x1, 
    int       y1, 
    int       x2, 
    int       y2
)
{
    ScrnInfoPtr pScreenInfo = xf86Screens[pPixmap->drawable.pScreen->myNum];
    ATIPtr pATI = ATIPTR(pScreenInfo);

    int x = x1;
    int y = y1;
    int w = x2-x1;
    int h = y2-y1;

    ATIDRISync(pScreenInfo);

    if (pATI->XModifier != 1)
    {
        x *= pATI->XModifier;
        w *= pATI->XModifier;

        outf(DST_CNTL, SetBits((x / 4) % 6, DST_24_ROT) |
            (DST_X_DIR | DST_Y_DIR | DST_24_ROT_EN));
    }

    /* Disable clipping if it gets in the way */
    ATIMach64ValidateClip(pATI, x, x + w - 1, y, y + h - 1);

    ATIMach64WaitForFIFO(pATI, 2);
    outf(DST_Y_X, SetWord(x, 1) | SetWord(y, 0));
    outf(DST_HEIGHT_WIDTH, SetWord(w, 1) | SetWord(h, 0));
}

static void Mach64DoneSolid(PixmapPtr pPixmap) { }

/*
 * Memcpy-based UTS.
 */
static Bool
Mach64UploadToScreen(PixmapPtr pDst, int x, int y, int w, int h,
    char *src, int src_pitch)
{
    char  *dst        = pDst->devPrivate.ptr;
    int    dst_pitch  = exaGetPixmapPitch(pDst);

    int bpp    = pDst->drawable.bitsPerPixel;
    int cpp    = (bpp + 7) / 8;
    int wBytes = w * cpp;

    exaWaitSync(pDst->drawable.pScreen);

    dst += (x * cpp) + (y * dst_pitch);

    while (h--) {
        memcpy(dst, src, wBytes);
        src += src_pitch;
        dst += dst_pitch;
    }

    return TRUE;
}

/*
 * Memcpy-based DFS.
 */
static Bool
Mach64DownloadFromScreen(PixmapPtr pSrc, int x, int y, int w, int h,
    char *dst, int dst_pitch)
{
    char  *src        = pSrc->devPrivate.ptr;
    int    src_pitch  = exaGetPixmapPitch(pSrc);

    int bpp    = pSrc->drawable.bitsPerPixel;
    int cpp    = (bpp + 7) / 8;
    int wBytes = w * cpp;

    exaWaitSync(pSrc->drawable.pScreen);

    src += (x * cpp) + (y * src_pitch);

    while (h--) {
        memcpy(dst, src, wBytes);
        src += src_pitch;
        dst += dst_pitch;
    }

    return TRUE;
}

#include "atimach64render.c"

/* Compute log base 2 of val. */
static __inline__ int Mach64Log2(int val)
{
    int bits;

    for (bits = 0; val != 0; val >>= 1, ++bits)
        ;
    return bits - 1;
}

/*
 * Memory layour for EXA with DRI (no local_textures):
 * | front  | back   | depth  | textures | pixmaps, xv | c |
 *
 * 1024x768@16bpp with 8 MB:
 * | 1.5 MB | 1.5 MB | 1.5 MB | 0        | ~3.5 MB     | c |
 *
 * 1024x768@32bpp with 8 MB:
 * | 3.0 MB | 3.0 MB | 1.5 MB | 0        | ~0.5 MB     | c |
 *
 * "c" is the hw cursor which occupies 1KB
 */
static void
Mach64SetupMemEXA(ScreenPtr pScreen)
{
    ScrnInfoPtr pScreenInfo = xf86Screens[pScreen->myNum];
    ATIPtr pATI = ATIPTR(pScreenInfo);

    int cpp = (pScreenInfo->bitsPerPixel + 7) / 8;
    /* front and back buffer */
    int bufferSize = pScreenInfo->virtualY * pScreenInfo->displayWidth * cpp;
    /* always 16-bit z-buffer */
    int depthSize  = pScreenInfo->virtualY * pScreenInfo->displayWidth * 2;

    ExaDriverPtr pExa = pATI->pExa;

    pExa->memoryBase = pATI->pMemory;
    pExa->memorySize = pScreenInfo->videoRam * 1024;
    pExa->offScreenBase = bufferSize;

#ifdef XF86DRI_DEVEL
    if (pATI->directRenderingEnabled)
    {
	ATIDRIServerInfoPtr pATIDRIServer = pATI->pDRIServerInfo;
	Bool is_pci = pATIDRIServer->IsPCI;

	int textureSize = 0;
	int pixmapCache = 0;
	int next = 0;

	/* front buffer */
	pATIDRIServer->frontOffset = 0;
	pATIDRIServer->frontPitch = pScreenInfo->displayWidth;
	next += bufferSize;

	/* back buffer */
	pATIDRIServer->backOffset = next;
	pATIDRIServer->backPitch = pScreenInfo->displayWidth;
	next += bufferSize;

	/* depth buffer */
	pATIDRIServer->depthOffset = next;
	pATIDRIServer->depthPitch = pScreenInfo->displayWidth;
	next += depthSize;

	/* ATIScreenInit does check for the this condition. */
	if (next > pExa->memorySize)
	{
	    xf86DrvMsg(pScreen->myNum, X_WARNING,
		"DRI static buffer allocation failed, disabling DRI --"
		"need at least %d kB video memory\n", next / 1024 );
	    ATIDRICloseScreen(pScreen);
	    pATI->directRenderingEnabled = FALSE;
	}

	/* local textures */

	/* Reserve approx. half of offscreen memory for local textures */
	textureSize = (pExa->memorySize - next) / 2;

	/* In case DRI requires more offscreen memory than available,
	 * should not happen as ATIScreenInit would have not enabled DRI */
	if (textureSize < 0)
	    textureSize = 0;

	/* Try for enough pixmap cache for a full viewport */
	pixmapCache = (pExa->memorySize - next) - textureSize;
	if (pixmapCache < bufferSize)
	    textureSize = 0;

	/* Don't allocate a local texture heap for AGP unless requested */
	if ( !is_pci && !pATI->OptionLocalTextures )
	    textureSize = 0;

	if (textureSize > 0)
	{
	    int l = Mach64Log2(textureSize / MACH64_NR_TEX_REGIONS);
	    if (l < MACH64_LOG_TEX_GRANULARITY)
		l = MACH64_LOG_TEX_GRANULARITY;
	    pATIDRIServer->logTextureGranularity = l;

	    /* Round the texture size down to the nearest whole number of
	     * texture regions.
	     */
	    textureSize = (textureSize >> l) << l;
	}

	/* Set a minimum usable local texture heap size.  This will fit
	 * two 256x256 textures.  We check this after any rounding of
	 * the texture area.
	 */
	if (textureSize < 256*256 * cpp * 2)
	    textureSize = 0;

	/* Disable DRI for PCI if cannot allocate a local texture heap */
	if ( is_pci && textureSize == 0 )
	{
	    xf86DrvMsg(pScreen->myNum, X_WARNING,
		"Not enough memory for local textures, disabling DRI\n");
	    ATIDRICloseScreen(pScreen);
	    pATI->directRenderingEnabled = FALSE;
	}

	pATIDRIServer->textureOffset = next;
	pATIDRIServer->textureSize = textureSize;
	next += textureSize;

	if (pATI->directRenderingEnabled)
	    pExa->offScreenBase = next;
    }
#endif /* XF86DRI_DEVEL */

    xf86DrvMsg(pScreen->myNum, X_INFO,
        "EXA memory management initialized\n"
        "\t base     :  %10p\n"
        "\t offscreen: +%10lx\n"
        "\t size     : +%10lx\n"
        "\t cursor   :  %10p\n",
        pExa->memoryBase,
        pExa->offScreenBase,
        pExa->memorySize,
        pATI->pCursorImage);

    if (TRUE || xf86GetVerbosity() > 1)
    {
        int offscreen = pExa->memorySize - pExa->offScreenBase;
        int viewport = bufferSize;
        int dvdframe = 720*480*cpp; /* enough for single-buffered DVD */

        xf86DrvMsg(pScreen->myNum, X_INFO,
            "Will use %d kB of offscreen memory for EXA\n"
            "\t\t or %5.2f viewports (composite)\n"
            "\t\t or %5.2f dvdframes (xvideo)\n",
            offscreen / 1024,
            1.0 * offscreen / viewport,
            1.0 * offscreen / dvdframe);
    }

#ifdef XF86DRI_DEVEL
    if (pATI->directRenderingEnabled)
    {
        ATIDRIServerInfoPtr pATIDRIServer = pATI->pDRIServerInfo;

        xf86DrvMsg(pScreen->myNum, X_INFO,
                   "Will use back  buffer at offset 0x%x\n",
                   pATIDRIServer->backOffset);

        xf86DrvMsg(pScreen->myNum, X_INFO,
                   "Will use depth buffer at offset 0x%x\n",
                   pATIDRIServer->depthOffset);

        if (pATIDRIServer->textureSize > 0)
        {
            xf86DrvMsg(pScreen->myNum, X_INFO,
                   "Will use %d kB for local textures at offset 0x%x\n",
                   pATIDRIServer->textureSize/1024,
                   pATIDRIServer->textureOffset);
        }
    }
#endif /* XF86DRI_DEVEL */

    pExa->pixmapOffsetAlign = 64;
    pExa->pixmapPitchAlign = 64;

    pExa->flags = EXA_OFFSCREEN_PIXMAPS;

    pExa->maxX = ATIMach64MaxX;
    pExa->maxY = ATIMach64MaxY;
}

Bool ATIMach64ExaInit(ScreenPtr pScreen)
{
    ScrnInfoPtr pScreenInfo = xf86Screens[pScreen->myNum];
    ATIPtr pATI = ATIPTR(pScreenInfo);
    ExaDriverPtr pExa;

    /* FIXME: which chips support EXA ? */
    if (pATI->Chip < ATI_CHIP_264CT)
    {
        xf86DrvMsg(pScreenInfo->scrnIndex, X_ERROR,
            "EXA is not supported for ATI chips earlier than "
            "the ATI Mach64.\n");
        return FALSE;
    }

    pExa = exaDriverAlloc();
    if (!pExa)
        return FALSE;

    pATI->pExa = pExa;

    pExa->exa_major = 2;
    pExa->exa_minor = 0;

    Mach64SetupMemEXA(pScreen);

    pExa->WaitMarker = Mach64WaitMarker;

    pExa->PrepareSolid = Mach64PrepareSolid;
    pExa->Solid = Mach64Solid;
    pExa->DoneSolid = Mach64DoneSolid;

    pExa->PrepareCopy = Mach64PrepareCopy;
    pExa->Copy = Mach64Copy;
    pExa->DoneCopy = Mach64DoneCopy;

    /* EXA hits more optimized paths when it does not have to fallback because
     * of missing UTS/DFS, hook memcpy-based UTS/DFS.
     */
    pExa->UploadToScreen = Mach64UploadToScreen;
    pExa->DownloadFromScreen = Mach64DownloadFromScreen;

    if (pATI->RenderAccelEnabled) {
	if (pATI->Chip >= ATI_CHIP_264GTPRO) {
	    /* 3D Rage Pro does not support NPOT textures. */
	    pExa->flags |= EXA_OFFSCREEN_ALIGN_POT;

	    pExa->CheckComposite = Mach64CheckComposite;
	    pExa->PrepareComposite = Mach64PrepareComposite;
	    pExa->Composite = Mach64Composite;
	    pExa->DoneComposite = Mach64DoneComposite;
	} else {
	    xf86DrvMsg(pScreen->myNum, X_INFO,
		       "Render acceleration is not supported for ATI chips "
		       "earlier than the ATI 3D Rage Pro.\n");
	    pATI->RenderAccelEnabled = FALSE;
	}
    }

    xf86DrvMsg(pScreen->myNum, X_INFO, "Render acceleration %s\n",
	       pATI->RenderAccelEnabled ? "enabled" : "disabled");

    if (!exaDriverInit(pScreen, pATI->pExa)) {
	xfree(pATI->pExa);
	pATI->pExa = NULL;
	return FALSE;
    }

    return TRUE;
}
#endif