opengl缓存测试代码

# GLFW ## Introduction GLFW is a free, Open Source, multi-platform library for OpenGL and OpenGL ES application development. It provides a simple, platform-independent API for creating windows and contexts, reading input, handling events, etc. Version 3.1.2 adds fixes for a large number of bugs that together affect all supported platforms, as well as dynamic loading work that simplifies compilation and linking. If you are new to GLFW, you may find the [introductory tutorial](http://www.glfw.org/docs/latest/quick.html) for GLFW 3 useful. If you have used GLFW 2 in the past, there is a [transition guide](http://www.glfw.org/docs/latest/moving.html) for moving to the GLFW 3 API. Note that a number of source files have been added or renamed in 3.1, which may require you to update any custom build files you have. ## Compiling GLFW See the [Compiling GLFW](http://www.glfw.org/docs/latest/compile.html) guide in the GLFW documentation. ## Using GLFW See the [Building programs that use GLFW](http://www.glfw.org/docs/latest/build.html) guide in the GLFW documentation. ## Reporting bugs Bugs are reported to our [issue tracker](https://github.com/glfw/glfw/issues). Please always include the name and version of the OS where the bug occurs and the version of GLFW used. If you have cloned it, include the commit ID used. If it's a build issue, please also include the build log and the name and version of your development environment. If it's a context creation issue, please also include the make and model of your graphics card and the version of your driver. This will help both us and other people experiencing the same bug. ## Dependencies GLFW bundles a number of dependencies in the `deps/` directory. - [Khronos extension headers](https://www.opengl.org/registry/) for API extension symbols used by GLFW - [getopt\_port](https://github.com/kimgr/getopt_port/) for examples with command-line options - [TinyCThread](https://github.com/tinycthread/tinycthread) for threaded examples - An OpenGL 3.2 core loader generated by [glad](https://github.com/Dav1dde/glad) for examples using modern OpenGL - [linmath.h](https://github.com/datenwolf/linmath.h) for linear algebra in examples ## Changelog - Made all client API functions dynamically loaded - Changed minimum required CMake version to 2.8.12 - Replaced GLU with [linmath.h](https://github.com/datenwolf/linmath.h) in example programs - Merged all cursor test programs into the `cursor` program - Removed all mention of GLU in examples, build files and package dependencies - Bugfix: Initialization failed on headless systems - Bugfix: The cached current context could get out of sync - Bugfix: `glfwIconifyWindow` did not restore the original video mode for full screen windows created with `GLFW_AUTO_ICONIFY` - [Win32] Renamed hybrid GPU override compile-time option to `_GLFW_USE_HYBRID_HPG` and added support for AMD PowerXpress systems - [Win32] Bugfix: `glfwGetVideoModes` included unusable modes on some systems - [Win32] Bugfix: `glfwWaitEvents` would return directly for focused windows in disabled cursor mode - [Cocoa] Bugfix: The cached `NSScreen` for a monitor could get out of sync - [Cocoa] Bugfix: The `GLFW_AUTO_ICONIFY` window hint was ignored - [Cocoa] Bugfix: Resizing a window to its minimum size would segfault - [Cocoa] Bugfix: Creating or showing a window would make its context current - [Cocoa] Bugfix: Joysticks connected after `glfwInit` were not detected - [Cocoa] Bugfix: Cursor creation failed unless a window had been created. - [Cocoa] Bugfix: Window refresh events were not generated by iconification or restoration - [Cocoa] Bugfix: The primary monitor would get reported as disconnected when entering full screen on a dual-GPU machine with automatic graphics switching - [Cocoa] Bugfix: The original video modes were not restored when the application was hidden - [X11] Bugfix: `glfwInit` would segfault on systems without RandR - [X11] Bugfix: The response to `_NET_WM_PING` was sent to the wrong window - [X11] Bugfix: Character input via XIM did not work in many cases - [X11] Bugfix: No fallback existed for missing `_NET_ACTIVE_WINDOW` support - [X11] Bugfix: Some significant window focus events were ignored - [X11] Bugfix: The `GLFW_AUTO_ICONIFY` window hint was ignored - [X11] Bugfix: The original video mode was not restored on iconification of full screen windows - [X11] Bugfix: `GLFW_ARROW_CURSOR` selected the wrong cursor image - [X11] Bugfix: The `GLFW_DECORATED` hint was not ignored for full screen - [X11] Bugfix: `glfwWaitEvents` did not handle `EINTR` for `select` - [X11] Bugfix: `glfwWaitEvents` could return when no events were available - [X11] Bugfix: `XkbGetKeyboard` fails on XWayland - [X11] Bugfix: Character input did not work correctly for non-UTF-8 locales - [X11] Bugfix: Long input sequences generated by IMEs were discarded - [WGL] Made all WGL functions dynamically loaded - [WGL] Removed `GLFW_USE_DWM_SWAP_INTERVAL` compile-time option - [WGL] Bugfix: Swap interval was ignored when DWM was enabled - [WGL] Bugfix: Failure to find a pixel format was reported incorrectly - [GLX] Added dependency on `libdl` on systems where it provides `dlopen` - [GLX] Made all GLX functions dynamically loaded - [GLX] Removed `_GLFW_HAS_GLXGETPROCADDRESS*` and `_GLFW_HAS_DLOPEN` compile-time options - [GLX] Bugfix: Failure to find a `GLXFBConfig` was reported incorrectly - [EGL] Made all EGL functions dynamically loaded - [EGL] Bugfix: `glfwGetProcAddress` did not return the addresses of core functions - [EGL] Bugfix: Failure to find an `EGLConfig` was reported incorrectly - [NSGL] Bugfix: Failure to find a pixel format was reported incorrectly ## Contact The official website for GLFW is [glfw.org](http://www.glfw.org/). There you can find the latest version of GLFW, as well as news, documentation and other information about the project. If you have questions related to the use of GLFW, we have a [support forum](https://sourceforge.net/p/glfw/discussion/247562/), and the IRC channel `#glfw` on [Freenode](http://freenode.net/). If you have a bug to report, a patch to submit or a feature you'd like to request, please file it in the [issue tracker](https://github.com/glfw/glfw/issues) on GitHub. Finally, if you're interested in helping out with the development of GLFW or porting it to your favorite platform, join us on GitHub or IRC. ## Acknowledgements GLFW exists because people around the world donated their time and lent their skills. - Bobyshev Alexander - artblanc - arturo - Matt Arsenault - Keith Bauer - John Bartholomew - Niklas Behrens - Niklas Bergström - Doug Binks - blanco - Martin Capitanio - Chi-kwan Chan - Lambert Clara - Andrew Corrigan - Noel Cower - Jarrod Davis - Olivier Delannoy - Paul R. Deppe - Michael Dickens - Jonathan Dummer - Ralph Eastwood - Siavash Eliasi - Michael Fogleman - Gerald Franz - GeO4d - Marcus Geelnard - Eloi Marín Gratacós - Stefan Gustavson - Sylvain Hellegouarch - Matthew Henry - heromyth - Lucas Hinderberger - Paul Holden - Aaron Jacobs - Toni Jovanoski - Arseny Kapoulkine - Osman Keskin - Cameron King - Peter Knut - Eric Larson - Robin Leffmann - Glenn Lewis - Shane Liesegang - Eyal Lotem - Дмитри Малышев - Martins Mozeiko - Tristam MacDonald - Hans Mackowiak - Kyle McDonald - David Medlock - Bryce Mehring - Jonathan Mercier - Marcel Metz - Jonathan Miller - Kenneth Miller - Bruce Mitchener - Jack Moffitt - Jeff Molofee - Jon Morton - Pierre Moulon - Julian Møller - Kamil Nowakowski - Ozzy - Andri Pálsson - Peoro - Braden Pellett - Arturo J. Pérez - Emmanuel Gil Peyrot - Cyril Pichard - Pieroman - Jorge Rodriguez - Ed Ropple -