Is there a way to get the rotated texture on OpenGL

Question

I'm trying to get the rotated texture "actually is the quad that is rotated". I'm able to get the Texture image with:

glGetTexImage(GL_TEXTURE_2D, 1, GL_RGBA, GL_UNSIGNED_BYTE , pxData);

I want to create an matrix with the data of where is an object to implement pixel perfect collision, this matrix will be an bit matrix using shift, but i will add rotation to my images, so i want to know if there is a way to get from the opengl the rotated texture matrix.

If i use the glGetTexImage(GL_TEXTURE_2D, 1, GL_RGBA, GL_UNSIGNED_BYTE , pxData); it returns to me the texture, but if i want to get how will be the texture on an quad with X degrees of rotation?

Is there a way to archive that?

Answer 1

Rendering to a rotated quad does not rotate the actual source texture. What you probably want to do is render to a texture, see ie [1], and then read that texture.

[1] http://www.opengl-tutorial.org/intermediate-tutorials/tutorial-14-render-to-texture/