From e5070bc3ca75dee31034cc543f3d2ee04e5dc032 Mon Sep 17 00:00:00 2001 From: Brian Date: Fri, 16 Mar 2007 11:00:07 -0600 Subject: [PATCH] Assorted fixes for dealing with zero-size frame/renderbuffers. In xmesa_check_and_update_buffer_size() handle xmctx==NULL correctly: still call _mesa_resize_framebufer(). If we don't we can wind up in a situation where the framebuffer size is non-zero but an attached renderbuffer size is still initialized to zero. This inconsistancy can later cause problems. Check for zero-size renderbuffers in update_color_draw_buffers() and update_color_read_buffer(). See bug 7205. --- src/mesa/drivers/x11/xm_api.c | 14 ++++++++------ src/mesa/drivers/x11/xm_buffer.c | 39 +++++++++++++++++++++++---------------- src/mesa/main/framebuffer.c | 7 +++++-- src/mesa/main/renderbuffer.c | 26 +++++++++++++++----------- 4 files changed, 51 insertions(+), 35 deletions(-) diff --git a/src/mesa/drivers/x11/xm_api.c b/src/mesa/drivers/x11/xm_api.c index ba020fc..b513dc8 100644 --- a/src/mesa/drivers/x11/xm_api.c +++ b/src/mesa/drivers/x11/xm_api.c @@ -1842,16 +1842,18 @@ XMesaDestroyBuffer(XMesaBuffer b) * 1. the first time a buffer is bound to a context. * 2. from glViewport to poll for window size changes * 3. from the XMesaResizeBuffers() API function. + * Note: it's possible (and legal) for xmctx to be NULL. That can happen + * when resizing a buffer when no rendering context is bound. */ void xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer) { GLuint width, height; - xmesa_get_window_size(xmctx->display, drawBuffer, &width, &height); + xmesa_get_window_size(drawBuffer->display, drawBuffer, &width, &height); if (drawBuffer->mesa_buffer.Width != width || drawBuffer->mesa_buffer.Height != height) { - _mesa_resize_framebuffer(&(xmctx->mesa), - &(drawBuffer->mesa_buffer), width, height); + GLcontext *ctx = xmctx ? &xmctx->mesa : NULL; + _mesa_resize_framebuffer(ctx, &(drawBuffer->mesa_buffer), width, height); } drawBuffer->mesa_buffer.Initialized = GL_TRUE; /* XXX TEMPORARY? */ } @@ -2175,7 +2177,7 @@ void XMesaSwapBuffers( XMesaBuffer b ) } #endif if (b->backxrb->ximage) { - /* Copy Ximage from host's memory to server's window */ + /* Copy Ximage (back buf) from client memory to server window */ #if defined(USE_XSHM) && !defined(XFree86Server) if (b->shm) { /*_glthread_LOCK_MUTEX(_xmesa_lock);*/ @@ -2197,8 +2199,8 @@ void XMesaSwapBuffers( XMesaBuffer b ) /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/ } } - else { - /* Copy pixmap to window on server */ + else if (b->backxrb->pixmap) { + /* Copy pixmap (back buf) to window (front buf) on server */ /*_glthread_LOCK_MUTEX(_xmesa_lock);*/ XMesaCopyArea( b->xm_visual->display, b->backxrb->pixmap, /* source drawable */ diff --git a/src/mesa/drivers/x11/xm_buffer.c b/src/mesa/drivers/x11/xm_buffer.c index 73c46b1..c1fa233 100644 --- a/src/mesa/drivers/x11/xm_buffer.c +++ b/src/mesa/drivers/x11/xm_buffer.c @@ -168,9 +168,6 @@ alloc_back_shm_ximage(XMesaBuffer b, GLuint width, GLuint height) 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) { @@ -186,6 +183,9 @@ alloc_back_buffer(XMesaBuffer b, GLuint width, GLuint height) b->backxrb->ximage = NULL; } + if (width == 0 || height == 0) + return; + /* Allocate new back buffer */ #ifdef XFree86Server /* Allocate a regular XImage for the back buffer. */ @@ -218,20 +218,20 @@ alloc_back_buffer(XMesaBuffer b, GLuint width, GLuint 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); + XMesaFreePixmap(b->xm_visual->display, b->backxrb->pixmap); + b->backxrb->pixmap = 0; } - /* Allocate new back pixmap */ - b->backxrb->pixmap = XMesaCreatePixmap(b->xm_visual->display, - b->frontxrb->drawable, - width, height, - GET_VISUAL_DEPTH(b->xm_visual)); + + if (width > 0 && height > 0) { + /* 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; } } @@ -250,6 +250,7 @@ xmesa_delete_renderbuffer(struct gl_renderbuffer *rb) /** * Reallocate renderbuffer storage for front color buffer. + * Called via gl_renderbuffer::AllocStorage() */ static GLboolean xmesa_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb, @@ -260,6 +261,7 @@ xmesa_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb, /* just clear these to be sure we don't accidentally use them */ xrb->origin1 = NULL; xrb->origin2 = NULL; + xrb->origin3 = NULL; xrb->origin4 = NULL; /* for the FLIP macro: */ @@ -275,6 +277,7 @@ xmesa_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb, /** * Reallocate renderbuffer storage for back color buffer. + * Called via gl_renderbuffer::AllocStorage() */ static GLboolean xmesa_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb, @@ -309,8 +312,12 @@ xmesa_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb, xrb->origin4 = (GLuint *) xrb->ximage->data + xrb->width4 * (height - 1); } else { - /* this assertion will fail if we happend to run out of memory */ - /*assert(xrb->pixmap);*/ + /* out of memory or buffer size is 0 x 0 */ + xrb->width1 = xrb->width2 = xrb->width3 = xrb->width4 = 0; + xrb->origin1 = NULL; + xrb->origin2 = NULL; + xrb->origin3 = NULL; + xrb->origin4 = NULL; } return GL_TRUE; diff --git a/src/mesa/main/framebuffer.c b/src/mesa/main/framebuffer.c index 3136a95..cd4f594 100644 --- a/src/mesa/main/framebuffer.c +++ b/src/mesa/main/framebuffer.c @@ -647,7 +647,7 @@ update_color_draw_buffers(GLcontext *ctx, struct gl_framebuffer *fb) const GLuint bufferBit = 1 << i; if (bufferBit & bufferMask) { struct gl_renderbuffer *rb = fb->Attachment[i].Renderbuffer; - if (rb) { + if (rb && rb->Width > 0 && rb->Height > 0) { fb->_ColorDrawBuffers[output][count] = rb; count++; } @@ -673,7 +673,10 @@ static void update_color_read_buffer(GLcontext *ctx, struct gl_framebuffer *fb) { (void) ctx; - if (fb->_ColorReadBufferIndex == -1 || fb->DeletePending) { + if (fb->_ColorReadBufferIndex == -1 || + fb->DeletePending || + fb->Width == 0 || + fb->Height == 0) { fb->_ColorReadBuffer = NULL; /* legal! */ } else { diff --git a/src/mesa/main/renderbuffer.c b/src/mesa/main/renderbuffer.c index 1cc95a7..e387c42 100644 --- a/src/mesa/main/renderbuffer.c +++ b/src/mesa/main/renderbuffer.c @@ -1192,18 +1192,22 @@ _mesa_soft_renderbuffer_storage(GLcontext *ctx, struct gl_renderbuffer *rb, ASSERT(rb->PutMonoValues); /* free old buffer storage */ - if (rb->Data) + if (rb->Data) { _mesa_free(rb->Data); - - /* allocate new buffer storage */ - rb->Data = _mesa_malloc(width * height * pixelSize); - if (rb->Data == NULL) { - rb->Width = 0; - rb->Height = 0; - _mesa_error(ctx, GL_OUT_OF_MEMORY, - "software renderbuffer allocation (%d x %d x %d)", - width, height, pixelSize); - return GL_FALSE; + rb->Data = NULL; + } + + if (width > 0 && height > 0) { + /* allocate new buffer storage */ + rb->Data = _mesa_malloc(width * height * pixelSize); + if (rb->Data == NULL) { + rb->Width = 0; + rb->Height = 0; + _mesa_error(ctx, GL_OUT_OF_MEMORY, + "software renderbuffer allocation (%d x %d x %d)", + width, height, pixelSize); + return GL_FALSE; + } } rb->Width = width; -- 2.7.4