掌機 - Miyoo A30 - C/C++ - OpenGL ES 2.0 - Get Version

參考資訊：
https://www.khronos.org/assets/uploads/books/openglr_es_20_programming_guide_sample.pdf

main.c

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <dlfcn.h>
#include <unistd.h>
#include <EGL/egl.h>
#include <GLES2/gl2.h>

int main(int argc, char** argv)
{
    EGLint egl_major = 0;
    EGLint egl_minor = 0;
    EGLint num_configs = 0;
    EGLConfig configs = {0};
    EGLDisplay display = EGL_NO_DISPLAY;
    EGLSurface surface = EGL_NO_SURFACE;
    EGLContext context = EGL_NO_CONTEXT;
    EGLint config_attribs[] = {
        EGL_SURFACE_TYPE,    EGL_WINDOW_BIT,
        EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
        EGL_RED_SIZE,   8,  
        EGL_GREEN_SIZE, 8,
        EGL_BLUE_SIZE,  8,  
        EGL_ALPHA_SIZE, 8,
        EGL_NONE
    };
    EGLint window_attributes[] = { 
        EGL_RENDER_BUFFER, EGL_BACK_BUFFER,
        EGL_NONE
    };
    EGLint const context_attributes[] = {
        EGL_CONTEXT_CLIENT_VERSION, 2,
        EGL_NONE,
    };
 
    display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
    eglInitialize(display, &egl_major, &egl_minor);
    eglChooseConfig(display, config_attribs, &configs, 1, &num_configs);
    surface = eglCreateWindowSurface(display, configs, 0, window_attributes);
    context = eglCreateContext(display, configs, EGL_NO_CONTEXT, context_attributes);
    eglMakeCurrent(display, surface, surface, context);

    printf("%s\n", glGetString(GL_VERSION));

    eglMakeCurrent(display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
    eglDestroyContext(display, context);
    eglDestroySurface(display, surface);
    eglTerminate(display);
    return 0;
}

編譯

$ /opt/a30/bin/arm-linux-gcc main.c -o test -lGLESv2 -lEGL -ldl

執行

root@MIYOO282:/# /tmp/test
    OpenGL ES 2.0 "mali450-r5p1-01rel0-lollipop-252-gcc9bf62"