// SwiftShader Software Renderer | |
// | |
// Copyright(c) 2005-2012 TransGaming Inc. | |
// | |
// All rights reserved. No part of this software may be copied, distributed, transmitted, | |
// transcribed, stored in a retrieval system, translated into any human or computer | |
// language by any means, or disclosed to third parties without the explicit written | |
// agreement of TransGaming Inc. Without such an agreement, no rights or licenses, express | |
// or implied, including but not limited to any patent rights, are granted to you. | |
// | |
// Surface.cpp: Implements the egl::Surface class, representing a drawing surface | |
// such as the client area of a window, including any back buffers. | |
// Implements EGLSurface and related functionality. [EGL 1.4] section 2.2 page 3. | |
#include "FrameBufferX11.hpp" | |
#include "libX11.hpp" | |
#include <sys/ipc.h> | |
#include <sys/shm.h> | |
#include <string.h> | |
#include <assert.h> | |
namespace sw | |
{ | |
static int (*PreviousXErrorHandler)(Display *display, XErrorEvent *event) = 0; | |
static bool shmBadAccess = false; | |
// Catches BadAcces errors so we can fall back to not using MIT-SHM | |
static int XShmErrorHandler(Display *display, XErrorEvent *event) | |
{ | |
if(event->error_code == BadAccess) | |
{ | |
shmBadAccess = true; | |
return 0; | |
} | |
else | |
{ | |
return PreviousXErrorHandler(display, event); | |
} | |
} | |
FrameBufferX11::FrameBufferX11(Display *display, Window window, int width, int height) : FrameBuffer(width, height, false, false), x_window(window), x_display(display), ownX11(!display) | |
{ | |
if(!x_display) | |
{ | |
x_display = libX11->XOpenDisplay(0); | |
} | |
int screen = DefaultScreen(x_display); | |
x_gc = libX11->XDefaultGC(x_display, screen); | |
int depth = libX11->XDefaultDepth(x_display, screen); | |
Status status = libX11->XMatchVisualInfo(x_display, screen, 32, TrueColor, &x_visual); | |
bool match = (status != 0 && x_visual.blue_mask == 0xFF); // Prefer X8R8G8B8 | |
Visual *visual = match ? x_visual.visual : libX11->XDefaultVisual(x_display, screen); | |
mit_shm = (libX11->XShmQueryExtension && libX11->XShmQueryExtension(x_display) == True); | |
if(mit_shm) | |
{ | |
x_image = libX11->XShmCreateImage(x_display, visual, depth, ZPixmap, 0, &shminfo, width, height); | |
shminfo.shmid = shmget(IPC_PRIVATE, x_image->bytes_per_line * x_image->height, IPC_CREAT | SHM_R | SHM_W); | |
shminfo.shmaddr = x_image->data = buffer = (char*)shmat(shminfo.shmid, 0, 0); | |
shminfo.readOnly = False; | |
PreviousXErrorHandler = libX11->XSetErrorHandler(XShmErrorHandler); | |
libX11->XShmAttach(x_display, &shminfo); // May produce a BadAccess error | |
libX11->XSync(x_display, False); | |
libX11->XSetErrorHandler(PreviousXErrorHandler); | |
if(shmBadAccess) | |
{ | |
mit_shm = false; | |
XDestroyImage(x_image); | |
shmdt(shminfo.shmaddr); | |
shmctl(shminfo.shmid, IPC_RMID, 0); | |
shmBadAccess = false; | |
} | |
} | |
if(!mit_shm) | |
{ | |
buffer = new char[width * height * 4]; | |
x_image = libX11->XCreateImage(x_display, visual, depth, ZPixmap, 0, buffer, width, height, 32, width * 4); | |
} | |
} | |
FrameBufferX11::~FrameBufferX11() | |
{ | |
if(!mit_shm) | |
{ | |
x_image->data = 0; | |
XDestroyImage(x_image); | |
delete[] buffer; | |
buffer = 0; | |
} | |
else | |
{ | |
libX11->XShmDetach(x_display, &shminfo); | |
XDestroyImage(x_image); | |
shmdt(shminfo.shmaddr); | |
shmctl(shminfo.shmid, IPC_RMID, 0); | |
} | |
if(ownX11) | |
{ | |
libX11->XCloseDisplay(x_display); | |
} | |
} | |
void *FrameBufferX11::lock() | |
{ | |
stride = x_image->bytes_per_line; | |
locked = buffer; | |
return locked; | |
} | |
void FrameBufferX11::unlock() | |
{ | |
locked = 0; | |
} | |
void FrameBufferX11::blit(void *source, const Rect *sourceRect, const Rect *destRect, Format sourceFormat, size_t sourceStride) | |
{ | |
copy(source, sourceFormat, sourceStride); | |
if(!mit_shm) | |
{ | |
libX11->XPutImage(x_display, x_window, x_gc, x_image, 0, 0, 0, 0, width, height); | |
} | |
else | |
{ | |
libX11->XShmPutImage(x_display, x_window, x_gc, x_image, 0, 0, 0, 0, width, height, False); | |
} | |
libX11->XSync(x_display, False); | |
} | |
} | |
sw::FrameBuffer *createFrameBuffer(Display *display, Window window, int width, int height) | |
{ | |
return new sw::FrameBufferX11(display, window, width, height); | |
} |