Resizing an image using OpenGL

Question

I would like to resize the image using OpenGL. I would prefer this in Java, but C ++ is fine too.

I'm really new to all of this, so here is the process in words, as I see it:

• upload texture image to ogl
• set some things regarding state and filtering
• draw a texture of different sizes on a different texture.
• get texture data into an array or something.

Do you think it will be faster to use OpenGL and GPU than to use processor-based BLIT library?

Thank!

Answer 1

FBO , blit: glBlitFramebuffer. , FBO:

• , FBO (glCheckFramebufferStatus)
• FBO FBO (glBindFramebuffer)
• (glDraw/ReadBuffers)
• glBlitFramebuffer, GL_LINEAR

, GPU, .

Answer 2

, , OpenGL. GPU, , , , .

, OpenGL, .