gl2_drm

gl2_drm

Example how to do GL2 rendering with open-source vc4 OpenGL driver by using libdrm and mesa.

Requirements

Check the readme files for gles2_drm demo in parent folder for setting up required libraries and development header files.

Main differences from setting up GLES2 context:

• use EGL_OPENGL_API when calling eglBindAPI
• use EGL_OPENGL_BIT for EGL_RENDERABLE_TYPE when choosing config
• load GL functions with eglGetProcAddress because mesa does not have libGL.so for non-X11 builds, more info
• GLSL shader differences - no precision qualifiers in non-ES GLSL language (for GL 2.1 version)

Building & running

Execute make to build.

You can execute make run to build & upload & run executable on Raspberry Pi. By default it will try to connect to [email protected] host. You can override it by setting PI variable: make run [email protected]

You should see colorful triangle spinning. By default vsync is enabled, but you can disable it by changing ENABLE_VSYNC variable in source code.

Error handling is done using assert, feel free to change it when porting to your code.