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Big re-org of buffer size management.

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All buffer resizes now handled by xmesa_check_and_update_buffer_size() which
uses the _mesa_resize_framebuffer() function.
Moved all low-level XImage/Pixmap resizing into xm_buffers.c file.
Also, update lots of comments for Doxygen.
This commit is contained in:
Brian Paul
2006-10-14 22:52:17 +00:00
parent 2b46f4b853
commit d21fa9cd79
4 changed files with 529 additions and 494 deletions
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223
src/mesa/drivers/x11/xm_buffer.c
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@@ -1,8 +1,8 @@
/*
* Mesa 3-D graphics library
* Version: 6.5
* Version: 6.5.2
*
* Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@@ -23,6 +23,12 @@
*/
/**
* \file xm_buffer.h
* Framebuffer and renderbuffer-related functions.
*/
#include "glxheader.h"
#include "GL/xmesa.h"
#include "xmesaP.h"
@@ -30,6 +36,213 @@
#include "renderbuffer.h"
#ifndef XFree86Server
static volatile int mesaXErrorFlag = 0;
/**
* Catches potential Xlib errors.
*/
static int
mesaHandleXError(XMesaDisplay *dpy, XErrorEvent *event)
{
(void) dpy;
(void) event;
mesaXErrorFlag = 1;
return 0;
}
#endif
/**
* Allocate a shared memory XImage back buffer for the given XMesaBuffer.
* Return: GL_TRUE if success, GL_FALSE if error
*/
#ifndef XFree86Server
static GLboolean
alloc_back_shm_ximage(XMesaBuffer b, GLuint width, GLuint height)
{
#ifdef USE_XSHM
/*
* We have to do a _lot_ of error checking here to be sure we can
* really use the XSHM extension. It seems different servers trigger
* errors at different points if the extension won't work. Therefore
* we have to be very careful...
*/
GC gc;
int (*old_handler)(XMesaDisplay *, XErrorEvent *);
if (width == 0 || height == 0) {
/* this will be true the first time we're called on 'b' */
return GL_FALSE;
}
b->backxrb->ximage = XShmCreateImage(b->xm_visual->display,
b->xm_visual->visinfo->visual,
b->xm_visual->visinfo->depth,
ZPixmap, NULL, &b->shminfo,
width, height);
if (b->backxrb->ximage == NULL) {
_mesa_warning(NULL, "alloc_back_buffer: Shared memory error (XShmCreateImage), disabling.\n");
b->shm = 0;
return GL_FALSE;
}
b->shminfo.shmid = shmget(IPC_PRIVATE, b->backxrb->ximage->bytes_per_line
* b->backxrb->ximage->height, IPC_CREAT|0777);
if (b->shminfo.shmid < 0) {
_mesa_warning(NULL, "shmget failed while allocating back buffer.\n");
XDestroyImage(b->backxrb->ximage);
b->backxrb->ximage = NULL;
_mesa_warning(NULL, "alloc_back_buffer: Shared memory error (shmget), disabling.\n");
b->shm = 0;
return GL_FALSE;
}
b->shminfo.shmaddr = b->backxrb->ximage->data
= (char*)shmat(b->shminfo.shmid, 0, 0);
if (b->shminfo.shmaddr == (char *) -1) {
_mesa_warning(NULL, "shmat() failed while allocating back buffer.\n");
XDestroyImage(b->backxrb->ximage);
shmctl(b->shminfo.shmid, IPC_RMID, 0);
b->backxrb->ximage = NULL;
_mesa_warning(NULL, "alloc_back_buffer: Shared memory error (shmat), disabling.\n");
b->shm = 0;
return GL_FALSE;
}
b->shminfo.readOnly = False;
mesaXErrorFlag = 0;
old_handler = XSetErrorHandler(mesaHandleXError);
/* This may trigger the X protocol error we're ready to catch: */
XShmAttach(b->xm_visual->display, &b->shminfo);
XSync(b->xm_visual->display, False);
if (mesaXErrorFlag) {
/* we are on a remote display, this error is normal, don't print it */
XFlush(b->xm_visual->display);
mesaXErrorFlag = 0;
XDestroyImage(b->backxrb->ximage);
shmdt(b->shminfo.shmaddr);
shmctl(b->shminfo.shmid, IPC_RMID, 0);
b->backxrb->ximage = NULL;
b->shm = 0;
(void) XSetErrorHandler(old_handler);
return GL_FALSE;
}
shmctl(b->shminfo.shmid, IPC_RMID, 0); /* nobody else needs it */
/* Finally, try an XShmPutImage to be really sure the extension works */
gc = XCreateGC(b->xm_visual->display, b->frontxrb->drawable, 0, NULL);
XShmPutImage(b->xm_visual->display, b->frontxrb->drawable, gc,
b->backxrb->ximage, 0, 0, 0, 0, 1, 1 /*one pixel*/, False);
XSync(b->xm_visual->display, False);
XFreeGC(b->xm_visual->display, gc);
(void) XSetErrorHandler(old_handler);
if (mesaXErrorFlag) {
XFlush(b->xm_visual->display);
mesaXErrorFlag = 0;
XDestroyImage(b->backxrb->ximage);
shmdt(b->shminfo.shmaddr);
shmctl(b->shminfo.shmid, IPC_RMID, 0);
b->backxrb->ximage = NULL;
b->shm = 0;
return GL_FALSE;
}
return GL_TRUE;
#else
/* Can't compile XSHM support */
return GL_FALSE;
#endif
}
#endif
/**
* Setup an off-screen pixmap or Ximage to use as the back buffer.
* Input: b - the X/Mesa buffer
*/
static void
alloc_back_buffer(XMesaBuffer b, GLuint width, GLuint height)
{
if (width == 0 || height == 0)
return;
if (b->db_mode == BACK_XIMAGE) {
/* Deallocate the old backxrb->ximage, if any */
if (b->backxrb->ximage) {
#if defined(USE_XSHM) && !defined(XFree86Server)
if (b->shm) {
XShmDetach(b->xm_visual->display, &b->shminfo);
XDestroyImage(b->backxrb->ximage);
shmdt(b->shminfo.shmaddr);
}
else
#endif
XMesaDestroyImage(b->backxrb->ximage);
b->backxrb->ximage = NULL;
}
/* Allocate new back buffer */
#ifdef XFree86Server
/* Allocate a regular XImage for the back buffer. */
b->backxrb->ximage = XMesaCreateImage(b->xm_visual->BitsPerPixel,
width, height, NULL);
{
#else
if (b->shm == 0 || !alloc_back_shm_ximage(b, width, height)) {
/* Allocate a regular XImage for the back buffer. */
b->backxrb->ximage = XCreateImage(b->xm_visual->display,
b->xm_visual->visinfo->visual,
GET_VISUAL_DEPTH(b->xm_visual),
ZPixmap, 0, /* format, offset */
NULL,
width, height,
8, 0); /* pad, bytes_per_line */
#endif
if (!b->backxrb->ximage) {
_mesa_warning(NULL, "alloc_back_buffer: XCreateImage failed.\n");
return;
}
b->backxrb->ximage->data = (char *) MALLOC(b->backxrb->ximage->height
* b->backxrb->ximage->bytes_per_line);
if (!b->backxrb->ximage->data) {
_mesa_warning(NULL, "alloc_back_buffer: MALLOC failed.\n");
XMesaDestroyImage(b->backxrb->ximage);
b->backxrb->ximage = NULL;
}
else {
/* this call just updates the width/origin fields in the xrb */
b->backxrb->Base.AllocStorage(NULL, &b->backxrb->Base,
b->backxrb->Base.InternalFormat,
b->backxrb->ximage->width,
b->backxrb->ximage->height);
}
}
b->backxrb->pixmap = None;
}
else if (b->db_mode == BACK_PIXMAP) {
if (!width)
width = 1;
if (!height)
height = 1;
/* Free the old back pixmap */
if (b->backxrb->pixmap) {
XMesaFreePixmap(b->xm_visual->display, b->backxrb->pixmap);
}
/* Allocate new back pixmap */
b->backxrb->pixmap = XMesaCreatePixmap(b->xm_visual->display,
b->frontxrb->drawable,
width, height,
GET_VISUAL_DEPTH(b->xm_visual));
b->backxrb->ximage = NULL;
}
}
static void
xmesa_delete_renderbuffer(struct gl_renderbuffer *rb)
{
@@ -68,7 +281,6 @@ xmesa_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
/**
* Reallocate renderbuffer storage for back color buffer.
* XXX we should resize the back pixmap/ximage here.
*/
static GLboolean
xmesa_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
@@ -76,7 +288,12 @@ xmesa_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
{
struct xmesa_renderbuffer *xrb = xmesa_renderbuffer(rb);
/* reallocate the back buffer XImage or Pixmap */
assert(xrb->Parent);
alloc_back_buffer(xrb->Parent, width, height);
/* same as front buffer */
/* XXX why is this here? */
(void) xmesa_alloc_front_storage(ctx, rb, internalFormat, width, height);
/* plus... */