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Diffstat (limited to 'tests/OffscreenContextGLX.cc')
| -rw-r--r-- | tests/OffscreenContextGLX.cc | 328 |
1 files changed, 0 insertions, 328 deletions
diff --git a/tests/OffscreenContextGLX.cc b/tests/OffscreenContextGLX.cc deleted file mode 100644 index e607593..0000000 --- a/tests/OffscreenContextGLX.cc +++ /dev/null @@ -1,328 +0,0 @@ -/* - -Create an OpenGL context without creating an OpenGL Window. for Linux. - -See Also - - glxgears.c by Brian Paul from mesa-demos (mesa3d.org) - http://cgit.freedesktop.org/mesa/demos/tree/src/xdemos?id=mesa-demos-8.0.1 - http://www.opengl.org/sdk/docs/man/xhtml/glXIntro.xml - http://www.mesa3d.org/brianp/sig97/offscrn.htm - http://glprogramming.com/blue/ch07.html - OffscreenContext.mm (Mac OSX version) - -*/ - -/* - * Some portions of the code below are: - * Copyright (C) 1999-2001 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"), - * to deal in the Software without restriction, including without limitation - * the rights to use, copy, modify, merge, publish, distribute, sublicense, - * and/or sell copies of the Software, and to permit persons to whom the - * Software is furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included - * in all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS - * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL - * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN - * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN - * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. - */ - -#include "OffscreenContext.h" -#include "printutils.h" -#include "imageutils.h" -#include "system-gl.h" -#include "fbo.h" - -#include <GL/gl.h> -#include <GL/glx.h> - -#include <assert.h> -#include <sstream> - -#include <sys/utsname.h> // for uname - -using namespace std; - -struct OffscreenContext -{ - GLXContext openGLContext; - Display *xdisplay; - Window xwindow; - int width; - int height; - fbo_t *fbo; -}; - -void offscreen_context_init(OffscreenContext &ctx, int width, int height) -{ - ctx.width = width; - ctx.height = height; - ctx.openGLContext = NULL; - ctx.xdisplay = NULL; - ctx.xwindow = (Window)NULL; - ctx.fbo = NULL; -} - -string get_os_info() -{ - struct utsname u; - stringstream out; - - if (uname(&u) < 0) - out << "OS info: unknown, uname() error\n"; - else { - out << "OS info: " - << u.sysname << " " - << u.release << " " - << u.version << "\n"; - out << "Machine: " << u.machine; - } - return out.str(); -} - -string offscreen_context_getinfo(OffscreenContext *ctx) -{ - assert(ctx); - - if (!ctx->xdisplay) - return string("No GL Context initialized. No information to report\n"); - - int major, minor; - glXQueryVersion(ctx->xdisplay, &major, &minor); - - stringstream out; - out << "GL context creator: GLX\n" - << "PNG generator: lodepng\n" - << "GLX version: " << major << "." << minor << "\n" - << get_os_info(); - - return out.str(); -} - -static XErrorHandler original_xlib_handler = (XErrorHandler) NULL; -static bool XCreateWindow_failed = false; -static int XCreateWindow_error(Display *dpy, XErrorEvent *event) -{ - cerr << "XCreateWindow failed: XID: " << event->resourceid - << " request: " << (int)event->request_code - << " minor: " << (int)event->minor_code << "\n"; - char description[1024]; - XGetErrorText( dpy, event->error_code, description, 1023 ); - cerr << " error message: " << description << "\n"; - XCreateWindow_failed = true; - return 0; -} - -bool create_glx_dummy_window(OffscreenContext &ctx) -{ - /* - create a dummy X window without showing it. (without 'mapping' it) - and save information to the ctx. - - This purposely does not use glxCreateWindow, to avoid crashes, - "failed to create drawable" errors, and Mesa "WARNING: Application calling - GLX 1.3 function when GLX 1.3 is not supported! This is an application bug!" - - This function will alter ctx.openGLContext and ctx.xwindow if successfull - */ - - int attributes[] = { - GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT, //support all 3, for OpenCSG - GLX_RENDER_TYPE, GLX_RGBA_BIT, - GLX_RED_SIZE, 8, - GLX_GREEN_SIZE, 8, - GLX_BLUE_SIZE, 8, - GLX_ALPHA_SIZE, 8, - GLX_DEPTH_SIZE, 24, // depth-stencil for OpenCSG - GLX_STENCIL_SIZE, 8, - GLX_DOUBLEBUFFER, True, - None - }; - - Display *dpy = ctx.xdisplay; - - int num_returned = 0; - GLXFBConfig *fbconfigs = glXChooseFBConfig( dpy, DefaultScreen(dpy), attributes, &num_returned ); - if ( fbconfigs == NULL ) { - cerr << "glXChooseFBConfig failed\n"; - return false; - } - - XVisualInfo *visinfo = glXGetVisualFromFBConfig( dpy, fbconfigs[0] ); - if ( visinfo == NULL ) { - cerr << "glXGetVisualFromFBConfig failed\n"; - XFree( fbconfigs ); - return false; - } - - // can't depend on xWin==NULL at failure. use a custom Xlib error handler instead. - original_xlib_handler = XSetErrorHandler( XCreateWindow_error ); - - Window root = DefaultRootWindow( dpy ); - XSetWindowAttributes xwin_attr; - int width = ctx.width; - int height = ctx.height; - xwin_attr.background_pixmap = None; - xwin_attr.background_pixel = 0; - xwin_attr.border_pixel = 0; - xwin_attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone); - xwin_attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask; - unsigned long int mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask; - - Window xWin = XCreateWindow( dpy, root, 0, 0, width, height, - 0, visinfo->depth, InputOutput, - visinfo->visual, mask, &xwin_attr ); - - // Window xWin = XCreateSimpleWindow( dpy, DefaultRootWindow(dpy), 0,0,42,42, 0,0,0 ); - - XSync( dpy, false ); - if ( XCreateWindow_failed ) { - XFree( visinfo ); - XFree( fbconfigs ); - return false; - } - XSetErrorHandler( original_xlib_handler ); - - // Most programs would call XMapWindow here. But we don't, to keep the window hidden - // XMapWindow( dpy, xWin ); - - GLXContext context = glXCreateNewContext( dpy, fbconfigs[0], GLX_RGBA_TYPE, NULL, True ); - if ( context == NULL ) { - cerr << "glXCreateNewContext failed\n"; - XDestroyWindow( dpy, xWin ); - XFree( visinfo ); - XFree( fbconfigs ); - return false; - } - - //GLXWindow glxWin = glXCreateWindow( dpy, fbconfigs[0], xWin, NULL ); - - if (!glXMakeContextCurrent( dpy, xWin, xWin, context )) { - //if (!glXMakeContextCurrent( dpy, glxWin, glxWin, context )) { - cerr << "glXMakeContextCurrent failed\n"; - glXDestroyContext( dpy, context ); - XDestroyWindow( dpy, xWin ); - XFree( visinfo ); - XFree( fbconfigs ); - return false; - } - - ctx.openGLContext = context; - ctx.xwindow = xWin; - - XFree( visinfo ); - XFree( fbconfigs ); - - return true; -} - - -Bool create_glx_dummy_context(OffscreenContext &ctx) -{ - // This will alter ctx.openGLContext and ctx.xdisplay and ctx.xwindow if successfull - int major; - int minor; - Bool result = False; - - ctx.xdisplay = XOpenDisplay( NULL ); - if ( ctx.xdisplay == NULL ) { - cerr << "Unable to open a connection to the X server\n"; - return False; - } - - // glxQueryVersion is not always reliable. Use it, but then - // also check to see if GLX 1.3 functions exist - - glXQueryVersion(ctx.xdisplay, &major, &minor); - - if ( major==1 && minor<=2 && glXGetVisualFromFBConfig==NULL ) { - cerr << "Error: GLX version 1.3 functions missing. " - << "Your GLX version: " << major << "." << minor << endl; - } else { - result = create_glx_dummy_window(ctx); - } - - if (!result) XCloseDisplay( ctx.xdisplay ); - return result; -} - -OffscreenContext *create_offscreen_context(int w, int h) -{ - OffscreenContext *ctx = new OffscreenContext; - offscreen_context_init( *ctx, w, h ); - - // before an FBO can be setup, a GLX context must be created - // this call alters ctx->xDisplay and ctx->openGLContext - // and ctx->xwindow if successfull - if (!create_glx_dummy_context( *ctx )) { - return NULL; - } - - // glewInit must come after Context creation and before FBO calls. - GLenum err = glewInit(); - if (GLEW_OK != err) { - cerr << "Unable to init GLEW: " << glewGetErrorString(err) << endl; - return NULL; - } - - ctx->fbo = fbo_new(); - if (!fbo_init(ctx->fbo, w, h)) { - cerr << "GL Framebuffer Object init failed; dumping GLEW info" << endl; - return NULL; - } - - return ctx; -} - -bool teardown_offscreen_context(OffscreenContext *ctx) -{ - if (ctx) { - fbo_unbind(ctx->fbo); - fbo_delete(ctx->fbo); - XDestroyWindow( ctx->xdisplay, ctx->xwindow ); - glXDestroyContext( ctx->xdisplay, ctx->openGLContext ); - XCloseDisplay( ctx->xdisplay ); - return true; - } - return false; -} - -/*! - Capture framebuffer from OpenGL and write it to the given filename as PNG. -*/ -bool save_framebuffer(OffscreenContext *ctx, const char *filename) -{ - glXSwapBuffers(ctx->xdisplay, ctx->xwindow); - if (!ctx || !filename) return false; - int samplesPerPixel = 4; // R, G, B and A - GLubyte pixels[ctx->width * ctx->height * samplesPerPixel]; - glReadPixels(0, 0, ctx->width, ctx->height, GL_RGBA, GL_UNSIGNED_BYTE, pixels); - - // Flip it vertically - images read from OpenGL buffers are upside-down - int rowBytes = samplesPerPixel * ctx->width; - unsigned char *flippedBuffer = (unsigned char *)malloc(rowBytes * ctx->height); - if (!flippedBuffer) { - cerr << "Unable to allocate flipped buffer for corrected image."; - return 1; - } - flip_image(pixels, flippedBuffer, samplesPerPixel, ctx->width, ctx->height); - - bool writeok = write_png(filename, flippedBuffer, ctx->width, ctx->height); - - free(flippedBuffer); - - return writeok; -} - -void bind_offscreen_context(OffscreenContext *ctx) -{ - if (ctx) fbo_bind(ctx->fbo); -} |