Android的GLSurfaceView的OpenGL ES具有线性渐变的背景？ [英] Android GLSurfaceView OpenGL ES with linear-gradient background?

问题描述

本code，我可以明确的背景和添加颜色：

with this code, I can clear the background and add a color:

gl.glEnable(GL10.GL_DEPTH_TEST);    
gl.glClearColor(0.0f, 0.25f, 0.35f, 1.0f);
gl.glClear(GL10.GL_COLOR_BUFFER_BIT);

我怎样才能改变这种具有线性渐变的背景？例如白色的顶部和蓝色底部？

How can i change this to have a linear-gradient Background? e.g. White color at the top and blue color at the bottom?

推荐答案

有没有方法来清除一个梯度，但我只是画清颜色的彩色四，而不是：

There's no method to clear to a gradient, but I'd just draw a colored quad instead of clearing the color:

void drawFrame() {
   glDisable(GL_DEPTH_TEST);
   //draw screen aligned quad with color gradient 
   //    (top two vertices white, bottom two blue)
   drawGradientQuad();

   glClear(GL_DEPTH_BUFFER_BIT); //no need to clear color

   glEnable(GL_DEPTH_TEST);
   //draw rest of scene
}

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