Batch renderer submit optimization

[LPeter1997]

So the batch renderer's submit(...) function takes a lot of time, mainly because of the matrix multiplications. With a little trick I was able to cut down the time (60% to 50%). Here's what I did:

Maths::vec3f _tpos = *m_TransformationBack * position;

m_Buffer->Position = _tpos;
m_Buffer->TexCoord = texCoords[0];
m_Buffer->TexID = ts;
m_Buffer->Color = c;
m_Buffer++;

_tpos.y += size.y;

m_Buffer->Position = _tpos;
m_Buffer->TexCoord = texCoords[1];
m_Buffer->TexID = ts;
m_Buffer->Color = c;
m_Buffer++;

_tpos.x += size.x;

m_Buffer->Position = _tpos;
m_Buffer->TexCoord = texCoords[2];
m_Buffer->TexID = ts;
m_Buffer->Color = c;
m_Buffer++;

_tpos.y -= size.y;

m_Buffer->Position = _tpos;
m_Buffer->TexCoord = texCoords[3];
m_Buffer->TexID = ts;
m_Buffer->Color = c;
m_Buffer++;

So I'm saving the position, multyply it only once with the matrix, and then keep working with that. Because I don't have a very good computer, without this optimization I got around 3025 FPS. With this I've got almost 3300.

[PedDavid]

Nice one! Just got 200 fps's for free 👍 I think you should make a pull request

[Luminiscental]

This breaks rotation and scale for the transformation though...

[eatplayhate]

Yeah this doesn't produce the same results. A better optimization is to write a SIMD multiply function and process the positions as a batch.