// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "FrameBufferX11.hpp"
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#include "libX11.hpp"
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#include "System/Timer.hpp"
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <string.h>
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#include <assert.h>
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#include <stdlib.h>
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namespace sw
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{
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static int (*PreviousXErrorHandler)(Display *display, XErrorEvent *event) = 0;
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static bool shmBadAccess = false;
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// Catches BadAcces errors so we can fall back to not using MIT-SHM
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static int XShmErrorHandler(Display *display, XErrorEvent *event)
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{
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if(event->error_code == BadAccess)
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{
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shmBadAccess = true;
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return 0;
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}
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else
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{
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return PreviousXErrorHandler(display, event);
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}
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}
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FrameBufferX11::FrameBufferX11(Display *display, Window window, int width, int height) : FrameBuffer(width, height, false, false), ownX11(!display), x_display(display), x_window(window)
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{
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if(!x_display)
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{
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x_display = libX11->XOpenDisplay(0);
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assert(x_display);
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}
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int screen = DefaultScreen(x_display);
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x_gc = libX11->XDefaultGC(x_display, screen);
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int depth = libX11->XDefaultDepth(x_display, screen);
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XVisualInfo x_visual;
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Status status = libX11->XMatchVisualInfo(x_display, screen, 32, TrueColor, &x_visual);
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bool match = (status != 0 && x_visual.blue_mask == 0xFF); // Prefer X8R8G8B8
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Visual *visual = match ? x_visual.visual : libX11->XDefaultVisual(x_display, screen);
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mit_shm = (libX11->XShmQueryExtension && libX11->XShmQueryExtension(x_display) == True);
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if(mit_shm)
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{
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x_image = libX11->XShmCreateImage(x_display, visual, depth, ZPixmap, 0, &shminfo, width, height);
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shminfo.shmid = shmget(IPC_PRIVATE, x_image->bytes_per_line * x_image->height, IPC_CREAT | SHM_R | SHM_W);
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shminfo.shmaddr = x_image->data = (char*)shmat(shminfo.shmid, 0, 0);
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shminfo.readOnly = False;
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PreviousXErrorHandler = libX11->XSetErrorHandler(XShmErrorHandler);
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libX11->XShmAttach(x_display, &shminfo); // May produce a BadAccess error
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libX11->XSync(x_display, False);
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libX11->XSetErrorHandler(PreviousXErrorHandler);
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if(shmBadAccess)
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{
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mit_shm = false;
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XDestroyImage(x_image);
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shmdt(shminfo.shmaddr);
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shmctl(shminfo.shmid, IPC_RMID, 0);
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shmBadAccess = false;
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}
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}
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if(!mit_shm)
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{
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int bytes_per_line = width * 4;
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int bytes_per_image = height * bytes_per_line;
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char *buffer = (char*)malloc(bytes_per_image);
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memset(buffer, 0, bytes_per_image);
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x_image = libX11->XCreateImage(x_display, visual, depth, ZPixmap, 0, buffer, width, height, 32, bytes_per_line);
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assert(x_image);
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if(!x_image)
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{
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free(buffer);
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}
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}
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}
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FrameBufferX11::~FrameBufferX11()
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{
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if(!mit_shm)
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{
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XDestroyImage(x_image);
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}
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else
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{
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libX11->XShmDetach(x_display, &shminfo);
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XDestroyImage(x_image);
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shmdt(shminfo.shmaddr);
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shmctl(shminfo.shmid, IPC_RMID, 0);
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}
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if(ownX11)
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{
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libX11->XCloseDisplay(x_display);
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}
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}
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void *FrameBufferX11::lock()
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{
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if(x_image)
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{
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stride = x_image->bytes_per_line;
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framebuffer = x_image->data;
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}
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return framebuffer;
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}
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void FrameBufferX11::unlock()
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{
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framebuffer = nullptr;
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}
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void FrameBufferX11::blit(sw::Surface *source, const Rect *sourceRect, const Rect *destRect)
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{
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copy(source);
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if(!mit_shm)
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{
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libX11->XPutImage(x_display, x_window, x_gc, x_image, 0, 0, 0, 0, width, height);
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}
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else
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{
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libX11->XShmPutImage(x_display, x_window, x_gc, x_image, 0, 0, 0, 0, width, height, False);
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}
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libX11->XSync(x_display, False);
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if(false) // Draw the framerate on screen
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{
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static double fpsTime = sw::Timer::seconds();
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static int frames = -1;
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double time = sw::Timer::seconds();
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double delta = time - fpsTime;
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frames++;
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static double FPS = 0.0;
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static double maxFPS = 0.0;
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if(delta > 1.0)
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{
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FPS = frames / delta;
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fpsTime = time;
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frames = 0;
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if(FPS > maxFPS)
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{
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maxFPS = FPS;
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}
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}
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char string[256];
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sprintf(string, "FPS: %.2f (max: %.2f)", FPS, maxFPS);
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libX11->XDrawString(x_display, x_window, x_gc, 50, 50, string, strlen(string));
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}
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}
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}
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NO_SANITIZE_FUNCTION sw::FrameBuffer *createFrameBuffer(void *display, Window window, int width, int height)
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{
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return new sw::FrameBufferX11((::Display*)display, window, width, height);
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}
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