Vertex Attribute Table

I am having some trouble with the vertex attribute table. In the documentation (seen here) it says that you can specify different vertex attributes ahead of time and call them when you need them, like so:

GX_SetVtxDesc(GX_VA_POS, GX_DIRECT);
GX_SetVtxDesc(GX_VA_NRM, GX_DIRECT);
GX_SetVtxDesc(GX_VA_CLR0, GX_DIRECT);
// Vertex Attribute 0
GX_SetVtxAttrFmt(GX_VTXFMT0, GX_VA_POS, GX_POS_XYZ, GX_F32, 0);
GX_SetVtxAttrFmt(GX_VTXFMT0, GX_VA_NRM, GX_NRM_XYZ, GX_F32, 0);
GX_SetVtxAttrFmt(GX_VTXFMT0, GX_VA_CLR0, GX_CLR_RGBA, GX_RGBA8, 0);
// Vertex Attribute 1
GX_SetVtxAttrFmt(GX_VTXFMT1, GX_VA_POS, GX_POS_XYZ, GX_F32, 0);
GX_SetVtxAttrFmt(GX_VTXFMT1, GX_VA_CLR0, GX_CLR_RGBA, GX_RGBA8, 0);

Then in my rendering code I call it like so:

// Only colors
GX_Begin(GX_QUADS, GX_VTXFMT1, 4);
	GX_Position3f32(0, 0, 0);
	GX_Color4u8(0xff, 0x00, 0x00, 0xff);
	GX_Position3f32(1, 2, 0);
	GX_Color4u8(0xff, 0xff, 0xff, 0xff);
	GX_Position3f32(1, 1, 0);
	GX_Color4u8(0x00, 0xff, 0x00, 0xff);
	GX_Position3f32(2, 1, 0);
	GX_Color4u8(0xff, 0xff, 0xff, 0xff);
GX_End();

//...

// Colors and normals
GX_Begin(GX_QUADS, GX_VTXFMT0, 4);
	GX_Position3f32(5, 5, 0);
	GX_Normal3f32(0, 1, 0);
	GX_Color4u8(0xff, 0x00, 0x00, 0xff);
	GX_Position3f32(8, 7, 0);
	GX_Normal3f32(0, 0, 0);
	GX_Color4u8(0xff, 0xff, 0xff, 0xff);
	GX_Position3f32(7, 7, 0);
	GX_Normal3f32(1, 0, 0);
	GX_Color4u8(0x00, 0xff, 0x00, 0xff);
	GX_Position3f32(7, 8, 0);
	GX_Normal3f32(1, 1, 0);
	GX_Color4u8(0xff, 0xff, 0xff, 0xff);
GX_End();

This just hangs. If I only use one (say VTXFMT0) then it all works just peachy. What am I doing wrong?

Thanks!

You set the vertex description to pos, normal and color but vtx1 is only pos and color?? Just a guess, I'm no GX guru.

Have you tried something like

GX_ClearVtxDesc( );
GX_SetVtxDesc(GX_VA_POS, GX_DIRECT);
GX_SetVtxDesc(GX_VA_CLR0, GX_DIRECT);

GX_Begin(GX_QUADS, GX_VTXFMT1, 4);
	GX_Position3f32(0, 0, 0);
	GX_Color4u8(0xff, 0x00, 0x00, 0xff);
	GX_Position3f32(1, 2, 0);
	GX_Color4u8(0xff, 0xff, 0xff, 0xff);
	GX_Position3f32(1, 1, 0);
	GX_Color4u8(0x00, 0xff, 0x00, 0xff);
	GX_Position3f32(2, 1, 0);
	GX_Color4u8(0xff, 0xff, 0xff, 0xff);
GX_End();


GX_ClearVtxDesc( );

GX_SetVtxDesc(GX_VA_POS, GX_DIRECT);
GX_SetVtxDesc(GX_VA_NRM, GX_DIRECT);
GX_SetVtxDesc(GX_VA_CLR0, GX_DIRECT);


GX_Begin(GX_QUADS, GX_VTXFMT0, 4);
	GX_Position3f32(5, 5, 0);
	GX_Normal3f32(0, 1, 0);
	GX_Color4u8(0xff, 0x00, 0x00, 0xff);
	GX_Position3f32(8, 7, 0);
	GX_Normal3f32(0, 0, 0);
	GX_Color4u8(0xff, 0xff, 0xff, 0xff);
	GX_Position3f32(7, 7, 0);
	GX_Normal3f32(1, 0, 0);
	GX_Color4u8(0x00, 0xff, 0x00, 0xff);
	GX_Position3f32(7, 8, 0);
	GX_Normal3f32(1, 1, 0);
	GX_Color4u8(0xff, 0xff, 0xff, 0xff);
GX_End(); 

Scanff, I could kiss you. That did the trick! Thank you so much!

;) welcome ... which reminds me I need to spend sometime on desmume soon.

Couldn't you set GX_VA_NRM to GX_NONE before using VTXFMT1 and then back to GX_DIRECT when you use VTXFMT0, rather than clearing all descriptors and setting POS and CLR0 each time?

That's an interesting point you bring up. I could do that after I render stuff. I wonder what would be faster.

As tueidj said, trying to avoid clearing all vertex descriptors and setting them again is a good idea. It's good for two reasons:
-Before every draw, the GP must collapse all state-changing commands and execute them, so avoiding these commands will save you GPU time
-Sending less commands also saves you space in the command FIFO.