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-rw-r--r--src/mesa/drivers/x11/xm_buffer.c216
1 files changed, 213 insertions, 3 deletions
diff --git a/src/mesa/drivers/x11/xm_buffer.c b/src/mesa/drivers/x11/xm_buffer.c
index 2a44e126f78..490c4796767 100644
--- a/src/mesa/drivers/x11/xm_buffer.c
+++ b/src/mesa/drivers/x11/xm_buffer.c
@@ -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 +36,206 @@
#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;
+ }
+ }
+ 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 +274,6 @@ 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 +281,12 @@ 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... */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 05:03:23 +0000