我试图用JOGL淡入/淡出图像。我可以渲染图像,但它总是呈现完整的强度。下面是代码:OpenGL淡出/不工作
private void render(GLAutoDrawable glad) {
GL2 gl = glad.getGL().getGL2();
// Prepares the rendering, things such as disabling depth, clearing the buffer bit etc
setUpGL(gl);
BufferedImage background = main.getCurrentState().getImage();
// Render the background, adapted from here: http://bit.ly/QjeusP
renderImage(gl, background, background.getWidth(), background.getHeight());
gl.glEnable(GL2.GL_BLEND);
gl.glBlendFunc(GL2.GL_SRC_ALPHA, GL2.GL_ONE_MINUS_SRC_ALPHA);
gl.glColor4f(0, 0, 0, alpha);
gl.glBegin(GL2.GL_QUADS);
gl.glVertex2f(0, background.getHeight());
gl.glVertex2f(background.getWidth(), background.getHeight());
gl.glVertex2f(background.getWidth(), 0);
gl.glVertex2f(0, 0);
gl.glEnd();
gl.glDisable(GL2.GL_BLEND);
}
变量alpha是浮子,它是由0.1对于每个递增渲染,如果它超过1.0,它是由0.1递减,直到它小于0,则递增,并且因此上。
编辑1:这里是一个更新的Alpha值码:
private void update() {
if (isTransparent) {
alpha += 0.1f;
if (alpha >= 1.0f) {
alpha = 1.0f;
isTransparent = false;
}
}
else {
alpha -= 0.1f;
if (alpha <= 0.0f) {
alpha = 0.0f;
isTransparent = true;
}
}
}
也许你应该显示'renderImage'的代码和更新'alpha'值的代码?而什么意思*“它不会淡入”*?图像是否总是呈现完整的强度? – 2012-07-25 15:34:58
@ChristianRau道歉,请参阅编辑 – mikeythemissile 2012-07-25 15:41:26
'alpha'在哪里定义和使用? – 2012-07-25 15:42:29