Problem with sceGuDrawArray

[skwi]

hello everybody
I can use sceGuDrawArray to draw in 2D with GU_TRANSFORM_2D but in 3D with GU_TRANSFORM_3D only sceGumDrawArray work, but sceGuDrawArray draw nothing, why ?
my program use the same GU initialisation as the sample "cube", and in the sample "cube" too, when I replace sceGumDrawArray by sceGuDrawArray, nothing is draw, why ? and what can I do to draw things in 3D with sceGuDrawArray
thank you for the answer

[chp]

Because sceGumDraw*()-functions flush the matrix-cache before it calls sceGuDraw*(). Use sceGumUpdateMatrix() prior to sceGuDrawArray() if you use the gum-library to transform your geometry.

[skwi]

thank you, I'll try to change things

[skwi]

but is guDrawArray faster as gumDrawarray? is there any advantages to use guDrawArray instead of gumDrawArray ?

[chp]

sceGuDrawArray() is the function that actually renders anything. sceGumDrawArray() is a convenience-function in PSPGUM that makes sure that matrices modified by sceGum*()-functions are flushed to the hardware. It's basically this:

Code: Select all

void sceGumDrawArray(...)
{
 sceGumUpdateMatrix();
 sceGuDrawArray(...);
}

[skwi]

thank you a lot
i think i understand now

but i'll continue programming later cause my psp screen is broken