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

从内存来看,我认为glColor3i使用缩放的颜色值来覆盖整个整数范围.因此你的255个值大约等于零......

请改为尝试2147483647.