I have succeed in loading an image to OpenGL as a texture (I use Gdk::Pixbuf from GTKmm library), but I have no idea how to get modified image from OpenGL and load it to Gdk::Pixbuf...
I want to modify images in OpenGL and the save them on hard disk.
There is some code:
Glib::RefPtr<Gdk::Pixbuf> pixmap = Gdk::Pixbuf::create_from_file("image.jpg");
GLuint texture[1];
glBindTexture(GL_TEXTURE_2D, texture[1]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, pixmap->get_width(), pixmap->get_height(), 0, GL_RGB, GL_UNSIGNED_BYTE, pixmap->get_pixels() );
将纹理四边形渲染到帧缓冲区,然后渲染glReadPixels()
。
只要你不使用OpenGL ES,但真正的桌面OpenGL,你就可以使用glGetTexImage
。
如果你想避免绘制调用,你可以创建一个帧缓冲并将纹理附加到颜色附件,然后使用glReadPixels
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