xcode - glColor3i 只绘制黑色

Question

为什么这只画黑色？

 glPushMatrix();
 // Check the current color
 glColor3i(255, 0, 255);
 GLint currentColor[4];
 glGetIntegerv(GL_CURRENT_COLOR, currentColor);
 //currentColor[0] = 254, 1 = 0, 2 = 254, 3 = doesn't matter

 glBegin(GL_QUADS);
 glLineWidth(1);
  glVertex2f(0, 0);
  glVertex2f(WINDOW_WIDTH * .1, 0);
  glVertex2f(WINDOW_WIDTH * .1, WINDOW_HEIGHT);
  glVertex2f(0, WINDOW_HEIGHT);
 glEnd();
 glPopMatrix();

Answer 1

根据内存，我认为 glColor3i 使用缩放以覆盖整个整数范围的颜色值。因此，您的 255 个值大约等于零.....

改为尝试 2147483647。