如何通过drm创建opengl上下文(Linux) [英] How to create opengl context via drm (Linux)

问题描述

我想在不使用X的情况下使用OpenGL渲染，并在Google上找到它:

I want to use OpenGL rendering without X, with google i find it: http://dvdhrm.wordpress.com/2012/08/11/kmscon-linux-kmsdrm-based-virtual-console/ there says that it is possible. I should use DRM and EGL. EGL can create opengl context but requires a NativeWindow. DRM probably will provide me NativeWindow, is not it? Should i use KMS? I know that i must have open source video driver. I want exactly OpenGL context, but not OpenGL ES (Linux). Maybe, someone knows tutorial or example code?

推荐答案

是的，您需要公里堆栈(示例). 此处是linux下的一个简单示例，它使用OpenGL es，但是使它与OpenGL api兼容的步骤很简单.

Yes, you need kms stack (example). Here is a simple example under linux, it use OpenGL es, But the step to have it working against OpenGL api are simple.

在egl属性中，将EGL_RENRERABLE_TYPE设置为EGL_OPENGL_BIT

In the egl attribs set EGL_RENRERABLE_TYPE to EGL_OPENGL_BIT

并告诉egl绑定到哪个api:

And tell egl which api to bind to:

eglBindAPI(EGL_OPENGL_API);

确保具有最新的内核驱动程序和mesa-dev，libdrm-dev，libgbm-dev.这些代码可在android上移植，而让默认的android图形堆栈静默起来并不是那么容易.

Be sure to have latest kernel drivers and mesa-dev, libdrm-dev, libgbm-dev. This pieces of code is portable on android, it's just not so easy to have default android graphic stack silenced.

注意:我在使用32位版本时遇到了麻烦，但仍然不知道为什么.这些库是积极开发的，因此不确定这不是一个错误.

* note2:是否支持浮点精度，具体取决于您的GLSL版本.

*note2: depending on your GLSL version, float precision is supported or not.

precision mediump float;

note3:如果您对/dev/dri/card0的渗透失败，请授予:

note3: if you have permision failure with /dev/dri/card0, grant it with:

sudo chmod 666 /dev/dri/card0

或使用

将当前用户添加到video组

sudo adduser $user video

您也可以为可执行文件设置setguid，并将组设置为video. (也许是最好的选择)

you may also setguid for your executable with group set to video. (maybe best option)

这篇关于如何通过drm创建opengl上下文(Linux)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！