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my code is here
gl.glPixelStorei(GL.GL_PACK_ALIGNMENT, 1);
gl.glPixelStorei(GL.GL_UNPACK_ALIGNMENT, 1);
ByteBuffer fbpixels = ByteBuffer.allocateDirect((WIDTH + 1)* (HEIGHT) * 3 - 1);
gl.glReadPixels(0,0, WIDTH, HEIGHT, GL.GL_RGB, GL.GL_UNSIGNED_BYTE, this.fbpixels);
gl.glRasterPos3f(0,0,0);
gl.glDrawPixels(WIDTH, HEIGHT, GL.GL_RGB, GL.GL_UNSIGNED_BYTE, this.fbpixels);
Q1.
why does not this code work in reshape(...) especially when called before glClear(GL.GL_COLOR_BUFFER_BIT); ? ==> fbpixels filled with only 0.
===> when called after glClear(GL.GL_COLOR_BUFFER_BIT), it filled with 255 (if glClearColor(1,1,1)).
But this code work well in display(...) method without glClear(GL.GL_COLOR_BUFFER_BIT);
Q2.
why glDrawPixels needs (WIDTH + 1)* (HEIGHT) * 3 - 1)?
However glReadPixels only needs WIDTH * HEIGHT * 3
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