OpenGL ES

OpenGL is a cross-platform software interface for 3D graphics processing. OpenGL ES is a OpenGL specification for embedded devices. OpenHarmony supports OpenGL ES 3.2.

Supported Capabilities

OpenGL ES 3.2

Symbols Exported from the Standard Library

OpenGL ES 3.2 Symbols Exported from Native APIs

OpenGL ES Extended APIs

• To obtain the official reference document for OpenGL ES extended APIs, visit Khronos OpenGL ES Registry.
• You can call glGetString to query the extended APIs supported by the chip. Before calling glGetString, you must initialize the context. The following is an example:

EGLDisplay display;
EGLConfig config;
EGLContext context;
EGLSurface surface;
EGLint majorVersion;
EGLint minorVersion;
EGLNativeWindowType win;
display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
eglInitialize(display, &majorVersion, &minorVersion);
display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
eglInitialize(display, &majorVersion, &minorVersion);
EGLint attribs[] = {
    EGL_RENDERABLE_TYPE,
    EGL_OPENGL_ES2_BIT,
    EGL_BLUE_SIZE, 8,
    EGL_GREEN_SIZE, 8,
    EGL_RED_SIZE, 8,
    EGL_NONE
};
eglChooseConfig(display, attribs, &config, 1, &numConfigs);
context = eglCreateContext(display, config, EGL_NO_CONTEXT, NULL);
surface = eglCreatePbufferSurface(display, config, NULL);
eglMakeCurrent(display, surface, surface, context);

char *strTest = new char[1024];
strTest = (char *)glGetString(GL_EXTENSIONS); // The return value of strTest lists all extended APIs, separated by spaces.
bool isHave = strTest.find("GL_OES_matrix_palette") != -1 ?
    true :
    false; // Check whether an extended API exists. If yes, the value of isHave is true. If no, the value of isHave is false.