OpenGL-从小于该屏幕的屏幕复制纹理-OpenGL-Copytexturefromscreensmallerthanthatscreen

I'm trying to capture the screen to a texture with a lower resolution than the screen itself (to render back onto the screen and create a blur/bloom effect), and it doesn't work quite well. I understand mipmaps can be used to do this, but I just can't get the correct sequence of commands to work.

我试图将屏幕捕获到分辨率低于屏幕本身的纹理(渲染回屏幕并创建模糊/绽放效果),并且它不能很好地工作。我知道mipmaps可以用来做到这一点,但我无法获得正确的命令序列。

My current code:

我目前的代码:

width=1024;
height=1024;

glGenTextures(1, &texture);

glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture);

glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glEnable (GL_BLEND);
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE,  GL_MODULATE);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP );

glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 0, 0, width, height, 0);

// code for rendering the screen back on goes here

1 个解决方案