I think projecting pixels from the buffer onto the screen would be faster, you don't need to project empty regions at all.
But calculating which (screen-)pixels have to be set for one (image-)pixel/texel needs some time, too.
Many clear texels -> image->screen faster
Many set texels -> screen->image faster

Also, are you doing real mode 7 (which doesn't support perspective/z at all)?

I don't know if it fits in here, but I can't find a better place..

Here I have a cube:

With rotation matrices I can rotate it on a specified axis and I can translate it:

But this doesn't look right, I don't want to have orthogonal projection, I want it to look like:


I already tried projection matrices but they're only displaying:

That's way to extreme and still in the wrong direction..

How can I achieve this?

BTW: The bottleneck of this seems to be the RAM write speed, on the emulator it runs > 200 FPS
On a real calulator ~90 FPS.
Would double buffering be faster than memcpy every frame?

Yes *facepalm myself*...
It does also indicate with a "$" at the end of a line it's longer than the screen.

Can't you do it like nano?

I got a Logitech USB Headset H390 for my calculator! YAY

Wouldn't it be better to provide it directly with newlib?
It would be faster and there will be no such problems anymore.
Only disadvantage would be the increasing size of the binary.

Edit: Workaround: Use http://stackoverflow.com/questions/2302969/how-to-implement-char-ftoafloat-num-without-sprintf-library-function-i.
The third answer works perfectly with floats, too.

Tried that, doesn't work.
But it shouldn't confuse va_list.

sprintf(str, "%d, %f, %lf", 1, 1.5f, 2.5);Should be fine I think.

Maybe GCC and Nucleus / TI's code use different formats for floating-point values ?

Is sprintf a syscall? Isn't it included in newlib?

Edit:
Gcc thinks "1.5f" is a double..

Nope, no change.

sprintf(str, "1: %d 2.5: %f 1.5: %f", 1, 2.5f, 1.5);prints: "1: 1 1.5: 0.000000 2.5: 0.000000".
Seems to be some kind of issue with va_list's and aligning, doesn't it?