glTexImage2D multiple images

Question

I\'m drawing an image from openCV full screen, this is a large image at 60fps so I needed a faster way than the openCV gui.

Using OpenGL I do:

void p         


        

Answer 1

Remember openGL is a state machine - you put it into a state, give it a command and it replays the states later.

One nice thing about textures is that you can do things outside the paint call - so if in your image processing step you generate image 1 you can load it into the card at that point.

glBindTexture(GL_TEXTURE_2D,tex_obj[1]);  // select image 1 slot
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, width1, height1, 0, GL_RGB, GL_UNSIGNED_BYTE, the_image_data1 ); // load it into the graphics card memory

And then recall it in the paint call

glBindTexture(GL_TEXTURE_2D,tex_obj[1]); // select pre loaded image 1
glBegin(GL_QUADS); // draw it