Function setupGraphics

hello-gl2/app/src/main/cpp/gl_code.cpp:121–140

GLuint gvPositionHandle;

bool setupGraphics(int w, int h) {
  printGLString("Version", GL_VERSION);
  printGLString("Vendor", GL_VENDOR);
  printGLString("Renderer", GL_RENDERER);
  printGLString("Extensions", GL_EXTENSIONS);

  LOGI("setupGraphics(%d, %d)", w, h);
  gProgram = createProgram(gVertexShader, gFragmentShader);
  if (!gProgram) {
    LOGE("Could not create program.");
    return false;
  }
  gvPositionHandle = glGetAttribLocation(gProgram, "vPosition");
  checkGlError("glGetAttribLocation");
  LOGI("glGetAttribLocation(\"vPosition\") = %d\n", gvPositionHandle);

  glViewport(0, 0, w, h);
  checkGlError("glViewport");
  return true;
}

const GLfloat gTriangleVertices[] = {0.0f, 0.5f, -0.5f, -0.5f, 0.5f, -0.5f};