i would like to display 2d graphics (like letters),
what 's the optimized way to do it ?
Use display list to store each 2d pattern, (ie each letter is stored in a separate way from the others).
Store a big bitmap with all the patterns in a texture, and use TexCoord (so i have to compute to know the position of the pattern inside the bitmap).
maybe a third way ??
what 's the use of glOrtho (concrete examples, please) ?
Use method 2.
Don’t bother with glortho for this job, just do this:-
Now your coordinates should be x and y, in the range of -1.0f and +1.0f to position vertices on the screen.
I prefer using glOrtho for for pixel precise (or almost) positioning of raster objects.
glOrtho(0.0, (GLdouble)windowwidth, 0.0, (GLdouble)windowHeight, znear, zfar);
The most likely quickest way on all cards is to use textured quads. Put them in display lists if you want.
What`s glOrtho for? Get the Red Book or find the online version.