r128_dri.c

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                version->version_minor,
                version->version_patchlevel);
            drmFreeVersion(version);
	    R128DRICloseScreen(pScreen);
            return FALSE;
	}
	drmFreeVersion(version);
    }

    /* Check the r128 DRM version */
    version = drmGetVersion(info->drmFD);
    if (version) {
	if (version->version_major != 2 ||
	    version->version_minor < 2) {
	    /* incompatible drm version */
	    xf86DrvMsg(pScreen->myNum, X_ERROR,
		"[dri] R128DRIScreenInit failed because of a version mismatch.\n"
		"[dri] r128.o kernel module version is %d.%d.%d but version 2.2 or greater is needed.\n"
		"[dri] Disabling the DRI.\n",
		version->version_major,
		version->version_minor,
		version->version_patchlevel);
	    drmFreeVersion(version);
	    R128DRICloseScreen(pScreen);
	    return FALSE;
	}
	info->drmMinor = version->version_minor;
	drmFreeVersion(version);
    }

				/* Initialize AGP */
    if (!info->IsPCI && !R128DRIAgpInit(info, pScreen)) {
	info->IsPCI = TRUE;
	xf86DrvMsg(pScreen->myNum, X_WARNING,
		   "[agp] AGP failed to initialize -- falling back to PCI mode.\n");
	xf86DrvMsg(pScreen->myNum, X_WARNING,
		   "[agp] Make sure you have the agpgart kernel module loaded.\n");
    }

				/* Initialize PCIGART */
    if (info->IsPCI && !R128DRIPciInit(info, pScreen)) {
	R128DRICloseScreen(pScreen);
	return FALSE;
    }

				/* DRIScreenInit doesn't add all the
				   common mappings.  Add additional
				   mappings here. */
    if (!R128DRIMapInit(info, pScreen)) {
	R128DRICloseScreen(pScreen);
	return FALSE;
    }

				/* DRIScreenInit adds the frame buffer
				   map, but we need it as well */
    {
	void *scratch_ptr;
        int scratch_int;

	DRIGetDeviceInfo(pScreen, &info->fbHandle,
                         &scratch_int, &scratch_int,
                         &scratch_int, &scratch_int,
                         &scratch_ptr);
    }

				/* FIXME: When are these mappings unmapped? */

    if (!R128InitVisualConfigs(pScreen)) {
	R128DRICloseScreen(pScreen);
	return FALSE;
    }
    xf86DrvMsg(pScrn->scrnIndex, X_INFO, "[dri] Visual configs initialized\n");

    return TRUE;
}

/* Finish initializing the device-dependent DRI state, and call
   DRIFinishScreenInit() to complete the device-independent DRI
   initialization. */
Bool R128DRIFinishScreenInit(ScreenPtr pScreen)
{
    ScrnInfoPtr      pScrn = xf86Screens[pScreen->myNum];
    R128InfoPtr      info  = R128PTR(pScrn);
    R128SAREAPrivPtr pSAREAPriv;
    R128DRIPtr       pR128DRI;

    info->pDRIInfo->driverSwapMethod = DRI_HIDE_X_CONTEXT;
    /* info->pDRIInfo->driverSwapMethod = DRI_SERVER_SWAP; */

    /* NOTE: DRIFinishScreenInit must be called before *DRIKernelInit
       because *DRIKernelInit requires that the hardware lock is held by
       the X server, and the first time the hardware lock is grabbed is
       in DRIFinishScreenInit. */
    if (!DRIFinishScreenInit(pScreen)) {
	R128DRICloseScreen(pScreen);
	return FALSE;
    }

    /* Initialize the kernel data structures */
    if (!R128DRIKernelInit(info, pScreen)) {
	R128DRICloseScreen(pScreen);
	return FALSE;
    }

    /* Initialize the vertex buffers list */
    if (!R128DRIBufInit(info, pScreen)) {
	R128DRICloseScreen(pScreen);
	return FALSE;
    }

    /* Initialize IRQ */
    R128DRIIrqInit(info, pScreen);

    /* Initialize and start the CCE if required */
    R128DRICCEInit(pScrn);

    pSAREAPriv = (R128SAREAPrivPtr)DRIGetSAREAPrivate(pScreen);
    memset(pSAREAPriv, 0, sizeof(*pSAREAPriv));

    pR128DRI                    = (R128DRIPtr)info->pDRIInfo->devPrivate;

    pR128DRI->deviceID          = info->Chipset;
    pR128DRI->width             = pScrn->virtualX;
    pR128DRI->height            = pScrn->virtualY;
    pR128DRI->depth             = pScrn->depth;
    pR128DRI->bpp               = pScrn->bitsPerPixel;

    pR128DRI->IsPCI             = info->IsPCI;
    pR128DRI->AGPMode           = info->agpMode;

    pR128DRI->frontOffset       = info->frontOffset;
    pR128DRI->frontPitch        = info->frontPitch;
    pR128DRI->backOffset        = info->backOffset;
    pR128DRI->backPitch         = info->backPitch;
    pR128DRI->depthOffset       = info->depthOffset;
    pR128DRI->depthPitch        = info->depthPitch;
    pR128DRI->spanOffset        = info->spanOffset;
    pR128DRI->textureOffset     = info->textureOffset;
    pR128DRI->textureSize       = info->textureSize;
    pR128DRI->log2TexGran       = info->log2TexGran;

    pR128DRI->registerHandle    = info->registerHandle;
    pR128DRI->registerSize      = info->registerSize;

    pR128DRI->agpTexHandle      = info->agpTexHandle;
    pR128DRI->agpTexMapSize     = info->agpTexMapSize;
    pR128DRI->log2AGPTexGran    = info->log2AGPTexGran;
    pR128DRI->agpTexOffset      = info->agpTexStart;
    pR128DRI->sarea_priv_offset = sizeof(XF86DRISAREARec);

    /* Have shadowfb run only while there is 3d active. */
    if (info->allowPageFlip && info->drmMinor >= 5 ) {
	ShadowFBInit( pScreen, R128DRIRefreshArea );
    } else if (info->allowPageFlip) {
	xf86DrvMsg(pScreen->myNum, X_WARNING,
		   "[dri] Kernel module version 2.5.0 or newer is required for pageflipping.\n");
       info->allowPageFlip = 0;
    }

    return TRUE;
}

/* The screen is being closed, so clean up any state and free any
   resources used by the DRI. */
void R128DRICloseScreen(ScreenPtr pScreen)
{
    ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
    R128InfoPtr info = R128PTR(pScrn);
    drmR128Init drmInfo;

				/* Stop the CCE if it is still in use */
    if (info->directRenderingEnabled) {
	R128CCE_STOP(pScrn, info);
    }

    if (info->irq) {
	drmCtlUninstHandler(info->drmFD);
	info->irq = 0;
	info->gen_int_cntl = 0;
    }

				/* De-allocate vertex buffers */
    if (info->buffers) {
	drmUnmapBufs(info->buffers);
	info->buffers = NULL;
    }

				/* De-allocate all kernel resources */
    memset(&drmInfo, 0, sizeof(drmR128Init));
    drmInfo.func = DRM_R128_CLEANUP_CCE;
    drmCommandWrite(info->drmFD, DRM_R128_INIT,
                    &drmInfo, sizeof(drmR128Init));

				/* De-allocate all AGP resources */
    if (info->agpTex) {
	drmUnmap(info->agpTex, info->agpTexMapSize);
	info->agpTex = NULL;
    }
    if (info->buf) {
	drmUnmap(info->buf, info->bufMapSize);
	info->buf = NULL;
    }
    if (info->ringReadPtr) {
	drmUnmap(info->ringReadPtr, info->ringReadMapSize);
	info->ringReadPtr = NULL;
    }
    if (info->ring) {
	drmUnmap(info->ring, info->ringMapSize);
	info->ring = NULL;
    }
    if (info->agpMemHandle != DRM_AGP_NO_HANDLE) {
	drmAgpUnbind(info->drmFD, info->agpMemHandle);
	drmAgpFree(info->drmFD, info->agpMemHandle);
	info->agpMemHandle = DRM_AGP_NO_HANDLE;
	drmAgpRelease(info->drmFD);
    }
    if (info->pciMemHandle) {
	drmScatterGatherFree(info->drmFD, info->pciMemHandle);
	info->pciMemHandle = 0;
    }

				/* De-allocate all DRI resources */
    DRICloseScreen(pScreen);

				/* De-allocate all DRI data structures */
    if (info->pDRIInfo) {
	if (info->pDRIInfo->devPrivate) {
	    xfree(info->pDRIInfo->devPrivate);
	    info->pDRIInfo->devPrivate = NULL;
	}
	DRIDestroyInfoRec(info->pDRIInfo);
	info->pDRIInfo = NULL;
    }
    if (info->pVisualConfigs) {
	xfree(info->pVisualConfigs);
	info->pVisualConfigs = NULL;
    }
    if (info->pVisualConfigsPriv) {
	xfree(info->pVisualConfigsPriv);
	info->pVisualConfigsPriv = NULL;
    }
}

/* Use callbacks from dri.c to support pageflipping mode for a single
 * 3d context without need for any specific full-screen extension.
 */

/* Use the shadowfb module to maintain a list of dirty rectangles.
 * These are blitted to the back buffer to keep both buffers clean
 * during page-flipping when the 3d application isn't fullscreen.
 *
 * Unlike most use of the shadowfb code, both buffers are in video memory.
 *
 * An alternative to this would be to organize for all on-screen drawing
 * operations to be duplicated for the two buffers.  That might be
 * faster, but seems like a lot more work...
 */


static void R128DRIRefreshArea(ScrnInfoPtr pScrn, int num, BoxPtr pbox)
{
    R128InfoPtr         info       = R128PTR(pScrn);
    int                 i;
    R128SAREAPrivPtr    pSAREAPriv = DRIGetSAREAPrivate(pScrn->pScreen);

    /* Don't want to do this when no 3d is active and pages are
     * right-way-round
     */
    if (!pSAREAPriv->pfAllowPageFlip && pSAREAPriv->pfCurrentPage == 0)
	return;

    (*info->accel->SetupForScreenToScreenCopy)(pScrn,
					       1, 1, GXcopy,
					       (CARD32)(-1), -1);

    for (i = 0 ; i < num ; i++, pbox++) {
	int xa = max(pbox->x1, 0), xb = min(pbox->x2, pScrn->virtualX-1);
	int ya = max(pbox->y1, 0), yb = min(pbox->y2, pScrn->virtualY-1);

	if (xa <= xb && ya <= yb) {
	    (*info->accel->SubsequentScreenToScreenCopy)(pScrn, xa, ya,
							 xa + info->backX,
							 ya + info->backY,
							 xb - xa + 1,
							 yb - ya + 1);
	}
    }
}

static void R128EnablePageFlip(ScreenPtr pScreen)
{
    ScrnInfoPtr         pScrn      = xf86Screens[pScreen->myNum];
    R128InfoPtr         info       = R128PTR(pScrn);
    R128SAREAPrivPtr    pSAREAPriv = DRIGetSAREAPrivate(pScreen);

    if (info->allowPageFlip) {
	/* Duplicate the frontbuffer to the backbuffer */
	(*info->accel->SetupForScreenToScreenCopy)(pScrn,
						   1, 1, GXcopy,
						   (CARD32)(-1), -1);

	(*info->accel->SubsequentScreenToScreenCopy)(pScrn,
						     0,
						     0,
						     info->backX,
						     info->backY,
						     pScrn->virtualX,
						     pScrn->virtualY);

	pSAREAPriv->pfAllowPageFlip = 1;
    }
}

static void R128DisablePageFlip(ScreenPtr pScreen)
{
    /* Tell the clients not to pageflip.  How?
     *   -- Field in sarea, plus bumping the window counters.
     *   -- DRM needs to cope with Front-to-Back swapbuffers.
     */
    R128SAREAPrivPtr  pSAREAPriv = DRIGetSAREAPrivate(pScreen);

    pSAREAPriv->pfAllowPageFlip = 0;
}

static void R128DRITransitionSingleToMulti3d(ScreenPtr pScreen)
{
    R128DisablePageFlip(pScreen);
}

static void R128DRITransitionMultiToSingle3d(ScreenPtr pScreen)
{
    /* Let the remaining 3d app start page flipping again */
    R128EnablePageFlip(pScreen);
}

static void R128DRITransitionTo3d(ScreenPtr pScreen)
{
    ScrnInfoPtr    pScrn = xf86Screens[pScreen->myNum];
    R128InfoPtr    info  = R128PTR(pScrn);

    R128EnablePageFlip(pScreen);

    info->have3DWindows = 1;

    if (info->cursor_start)
        xf86ForceHWCursor(pScreen, TRUE);
}

static void R128DRITransitionTo2d(ScreenPtr pScreen)
{
    ScrnInfoPtr         pScrn      = xf86Screens[pScreen->myNum];
    R128InfoPtr         info       = R128PTR(pScrn);
    R128SAREAPrivPtr    pSAREAPriv = DRIGetSAREAPrivate(pScreen);

    /* Try flipping back to the front page if necessary */
    if (pSAREAPriv->pfCurrentPage == 1)
	drmCommandNone(info->drmFD, DRM_R128_FLIP);

    /* Shut down shadowing if we've made it back to the front page */
    if (pSAREAPriv->pfCurrentPage == 0) {
	R128DisablePageFlip(pScreen);
    } else {
	xf86DrvMsg(pScreen->myNum, X_WARNING,
		   "[dri] R128DRITransitionTo2d: "
		   "kernel failed to unflip buffers.\n");
    }

    info->have3DWindows = 0;

    if (info->cursor_start)
        xf86ForceHWCursor(pScreen, FALSE);
}