The equivalent to glRotatef or how to convert to Gum.

[Pete333]

I'm pretty new to all this so please forgive me is this is a stupid question...

I have some GL code which I want to convert to Gum.

glPushMatrix();
glRotatef( Angle, 0.0f, 0.0f, 1.0f );

So far I have got this far:

sceGumPushMatrix();

but I can see no equivalent for glRotatef.

As I said, I'm pretty new to all this but I want to give programming the PSP a go, just for the fun without using OPEN GL. Thanks for any help :)

[jsharrad]

sceGumRotateX()
sceGumRotateY()
sceGumRotateZ()

Takes an angle argument in radians

sceGumRotateZYX()
sceGumRotateXYZ()

Takes a pointer to a vector containing the angles in radians

[Pete333]

I think I get this now, so my example needs to become this:

sceGumPushMatrix();
sceGumRotateZ(Angle*PI/180.0f);

I'm still pretty new to 3D so forgive my own ineptness :)

[jojojoris]

Take a look at the sdk GU samples.

sdkdir/psp/sdk/samples/gu/...

You can best start with the cube sample since thiis is the simplest.

you will see sometging like this:

Code: Select all

      sceGumMatrixMode(GU_MODEL);
		sceGumLoadIdentity();
		{
			ScePspFVector3 pos = { 0, 0, -2.5f };
			ScePspFVector3 rot = { 2, 2, 2};
			sceGumTranslate(&pos);
			sceGumRotateXYZ(&rot);
		}

That is a bit how you do it with the GU. (I don't know how it is done with OpenGL)

[Pete333]

Take a look at the sdk GU samples.

sdkdir/psp/sdk/samples/gu/...

You can best start with the cube sample since thiis is the simplest.

you will see sometging like this:

Code: Select all

      sceGumMatrixMode(GU_MODEL);
		sceGumLoadIdentity();
		{
			ScePspFVector3 pos = { 0, 0, -2.5f };
			ScePspFVector3 rot = { 2, 2, 2};
			sceGumTranslate(&pos);
			sceGumRotateXYZ(&rot);
		}

That is a bit how you do it with the GU. (I don't know how it is done with OpenGL)

Thanks :) I'll take a look at the examples. I'll refrain from posting until I really get stuck.

[Art]

I've written a little demo with a sample where triangles are defined at the
start of the program with a list of vertices in big arrays.

Where is the code to create a triangle at runtime?

[m0skit0]

Just fill those arrays at runtime :P