Contents - Raspberry PI Community Projects

egistry/egl/specs/eglspec.1.4.20110406.pdf) and the following EGL extensions (links are
to EGL registry documentation): [2]
▪ EGL_KHR_image (http://www.khronos.org/registry/egl/extensions/KHR/
EGL_KHR_image.txt)
▪ EGL_KHR_image_base (http://www.khronos.org/registry/egl/extensions/KHR/
EGL_KHR_image_base.txt)
▪ EGL_KHR_image_pixmap (http://www.khronos.org/registry/egl/extensions/
KHR/EGL_KHR_image_pixmap.txt)
▪ EGL_KHR_vg_parent_image (http://www.khronos.org/registry/egl/extensions/
KHR/EGL_KHR_vg_parent_image.txt)
▪ EGL_KHR_gl_texture_2D_image (http://www.khronos.org/registry/egl/
extensions/KHR/EGL_KHR_gl_image.txt)
▪ EGL_KHR_gl_texture_cubemap_image (http://www.khronos.org/registry/egl/
extensions/KHR/EGL_KHR_gl_image.txt)
▪ EGL_KHR_lock_surface (http://www.khronos.org/registry/egl/extensions/KHR/
EGL_KHR_lock_surface.txt)
Creating an on-screen EGL rendering surface requires you to to use the
eglCreateWindowSurface function, which takes a EGLNativeWindowType parameter. On
the Raspberry Pi, this is implemented as a EGL_DISPMANX_WINDOW_T struct,
which is defined in eglplatform.h as:
typedef struct {
DISPMANX_ELEMENT_HANDLE_T element;
int width; /* This is necessary because dispmanx elements are not queriable. */
int height;
} EGL_DISPMANX_WINDOW_T;
Therefore, to create a EGL surface you must also use the Dispmanx library to get a
dispmanx element handle. The hello_triangle source code (https://github.com/
raspberrypi/firmware/blob/master/opt/vc/src/hello_pi/hello_triangle/
triangle.c#L147-173) provides example code to do this.
Samples
See Getting Started with EGL (http://jonmacey.blogspot.com.au/2012/05/getting-startedwith-egl-on-raspberry.html)
post by Jon Macey. Extended documentation available in the
EGL Version 1.4 Specification (http://www.khronos.org/registry/egl/specs/
eglspec.1.4.20110406.pdf) and Simple Reference available in the EGL 1.4 API Quick
Reference Card (http://www.khronos.org/files/egl-1-4-quick-reference-card.pdf) .