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arti
d8d54bb990
The XIE path now runs end to end: XieCreateImage -> XieCreatePhoto ->
XiePutTile -> XieExport(photomap -> depth-1 pixmap) -> XCopyArea(pixmap ->
window), and the client's tile appears on screen at the client's own window
position, pixel-exact.
TWO FAULTS BEHIND THE LONG DEAD END
1. Device model (harness/mame/vt1200.cpp, opt-in VT1200_ACCEL=1). The
accelerator's output port 0x5600200 returns the pixel stream the firmware
pushed into the FIFO -- the firmware then stores it into the drawable itself
(file 0x125528: MOVE *B6,*B1 ; ADDK 0x10,B1). The FIFO read pointer was
never reset between transfers, so consecutive exports read stale words and
the same fill produced 759 then 516 set pixels. Reset m_fifo_in/out on the
data-register write; the export is now deterministic.
2. Measurement, not the device.
- dwt/screenshot.py without --real reads 1024x1024 at a 128-byte row stride,
but the VR319 default programs 1280x1024 at a 2048-bit (256-byte) pitch.
That is the "shifted" picture; --real is the correct read.
- The earlier "0 differing bytes over 128 KiB" VRAM comparison stepped peek
by 1024 *bit* addresses, so it scanned rows 0..63 only -- never the window
at rows 200..263. Over the real raster the white/black diff is 576 bytes
spanning exactly those rows.
- New instrument: decclient does a server-side XGetImage readback of the
pixmap and window and counts set pixels. That separated "the server never
drew it" from "the framebuffer view is wrong".
EVIDENCE (reproduced twice, the second time from a fresh machine)
no export vs 0xFF : 4096 / 4096 pixels differ
no export vs 0x00 : 0 / 4096 (the window background is black)
0xFF vs 0x00 : 4096 / 4096
0xAA vs 0x0F : 2048 / 4096 (the two stripe phases)
Tile byte 0xAA reproduces as 1-pixel vertical stripes, 0x0F as 4-pixel, with
no shear -- so the placement is right and the pixels are the client's.
Contents: xie/ holds DEC XIE 2.3 headers, 84 man pages and complete
client+server source; a libXie.a and decclient built from DEC's own code; the
XIE probes; and evidence/ with every measurement, including explicit
retractions of the earlier wrong readings (VRAM_IDENTICAL_FOR_BOTH_FILLS and
friends). xie/evidence/XIE_IMAGE_DISPLAYED.md is the report; frames are in
xie/evidence/png/.
The accelerator model stays opt-in: it answers the status poll and relays the
pixel stream, but performs no compositing, so it is a stand-in and the verified
default configuration is unchanged (a no-env run still parks in the level-0
diagnostics menu at PC=3FDCE400).
175 lines
5.0 KiB
C
175 lines
5.0 KiB
C
/*
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* *****************************************************************
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* * *
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* * Copyright (c) Digital Equipment Corporation, 1991, 1994 *
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* * *
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* * All Rights Reserved. Unpublished rights reserved under *
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* * the copyright laws of the United States. *
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* * *
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* * The software contained on this media is proprietary to *
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* * and embodies the confidential technology of Digital *
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* * Equipment Corporation. Possession, use, duplication or *
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* * dissemination of the software and media is authorized only *
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* * pursuant to a valid written license from Digital Equipment *
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* * Corporation. *
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* * *
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* * RESTRICTED RIGHTS LEGEND Use, duplication, or disclosure *
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* * by the U.S. Government is subject to restrictions as set *
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* * forth in Subparagraph (c)(1)(ii) of DFARS 252.227-7013, *
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* * or in FAR 52.227-19, as applicable. *
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* * *
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* *****************************************************************
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*/
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/*
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* HISTORY
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*/
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/************************************************************
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Copyright 1989 by The Massachusetts Institute of Technology
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Permission to use, copy, modify, and distribute this
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software and its documentation for any purpose and without
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fee is hereby granted, provided that the above copyright
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no- tice appear in all copies and that both that copyright
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no- tice and this permission notice appear in supporting
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docu- mentation, and that the name of MIT not be used in
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advertising or publicity pertaining to distribution of the
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software without specific prior written permission.
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M.I.T. makes no representation about the suitability of
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this software for any purpose. It is provided "as is"
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without any express or implied warranty.
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********************************************************/
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/* THIS IS NOT AN X CONSORTIUM STANDARD */
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/* $XConsortium: XShm.h,v 1.5 91/07/12 09:54:34 rws Exp $ */
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#ifndef _XSHM_H_
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#define _XSHM_H_
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#include <X11/Xfuncproto.h>
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#define X_ShmQueryVersion 0
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#define X_ShmAttach 1
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#define X_ShmDetach 2
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#define X_ShmPutImage 3
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#define X_ShmGetImage 4
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#define X_ShmCreatePixmap 5
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#define ShmCompletion 0
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#define ShmNumberEvents (ShmCompletion + 1)
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#define BadShmSeg 0
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#define ShmNumberErrors (BadShmSeg + 1)
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typedef unsigned int ShmSeg;
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#ifndef _XSHM_SERVER_
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typedef struct {
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int type; /* of event */
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unsigned long serial; /* # of last request processed by server */
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Bool send_event; /* true if this came frome a SendEvent request */
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Display *display; /* Display the event was read from */
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Drawable drawable; /* drawable of request */
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int major_code; /* ShmReqCode */
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int minor_code; /* X_ShmPutImage */
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ShmSeg shmseg; /* the ShmSeg used in the request */
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unsigned long offset; /* the offset into ShmSeg used in the request */
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} XShmCompletionEvent;
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typedef struct {
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ShmSeg shmseg; /* resource id */
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int shmid; /* kernel id */
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char *shmaddr; /* address in client */
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Bool readOnly; /* how the server should attach it */
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} XShmSegmentInfo;
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_XFUNCPROTOBEGIN
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Bool XShmQueryVersion(
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#if NeedFunctionPrototypes
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Display* /* dpy */,
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int* /* majorVersion */,
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int* /* minorVersion */,
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Bool* /* sharedPixmaps */
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#endif
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);
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int XShmPixmapFormat(
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#if NeedFunctionPrototypes
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Display* /* dpy */
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#endif
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);
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Status XShmAttach(
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#if NeedFunctionPrototypes
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Display* /* dpy */,
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XShmSegmentInfo* /* shminfo */
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#endif
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);
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Status XShmDetach(
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#if NeedFunctionPrototypes
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Display* /* dpy */,
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XShmSegmentInfo* /* shminfo */
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#endif
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);
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Status XShmPutImage(
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#if NeedFunctionPrototypes
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Display* /* dpy */,
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Drawable /* d */,
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GC /* gc */,
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XImage* /* image */,
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int /* src_x */,
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int /* src_y */,
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int /* dst_x */,
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int /* dst_y */,
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unsigned int /* src_width */,
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unsigned int /* src_height */,
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Bool /* send_event */
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#endif
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);
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Status XShmGetImage(
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#if NeedFunctionPrototypes
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Display* /* dpy */,
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Drawable /* d */,
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XImage* /* image */,
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int /* x */,
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int /* y */,
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unsigned long /* plane_mask */
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#endif
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);
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XImage *XShmCreateImage(
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#if NeedFunctionPrototypes
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Display* /* dpy */,
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Visual* /* visual */,
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unsigned int /* depth */,
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int /* format */,
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char* /* data */,
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XShmSegmentInfo* /* shminfo */,
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unsigned int /* width */,
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unsigned int /* height */
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#endif
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);
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Pixmap XShmCreatePixmap(
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#if NeedFunctionPrototypes
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Display* /* dpy */,
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Drawable /* d */,
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char* /* data */,
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XShmSegmentInfo* /* shminfo */,
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unsigned int /* width */,
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unsigned int /* height */,
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unsigned int /* depth */
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#endif
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);
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_XFUNCPROTOEND
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#endif
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#endif
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