forums.ps2dev.org

[cadaver]

Hi, I'm trying to manipulate the texture matrix stack with the same steps I use in OpenGL:

ScePspFVector3 v; v.x = -0.5; v.y = 0; v.z = 0;
sceGumMatrixMode(GU_TEXTURE);
sceGumLoadIdentity();
sceGumTranslate(&v);

sceGumDrawArray ...

but this has no effect (texture is drawn at the same position as without the matrix change), what is missing ?

[starman2049]

Not sure why this does not work for you. Might consider doing a sceKernelDcacheWritebackAll() in there, but thats just a blind guess. If all you are trying to do is offset texture coordiantes then try this (this is what I do to get textures scrolling across geometry:

[ufoz]

Don't you need to enable some state or mode to use the texture matrix? A quick look at gu.h suggests:

sceGuTexMapMode(GU_TEXTURE_MATRIX, ?, ?)

[cadaver]

ufoz,

I think you are right, I must set the TexMapMode to GU_TEXTURE_MATRIX, but:
- when I leave the 2 other parameters 0, the texture matrix isn't correct
- seems I have to set something else (didn't find info, how to use the 2. and 3. parameter of sceGuTexMapMode)

[cadaver]

Is anyone working with the gum texture matrix stack?

Manipulating texture coordinates with sceGuTexOffset is ok, but I couldn't get the texture matrix stack to work (see first post)