Vertex DMA

Use the DMA to transfer inactive lists to the PVR More...

Functions
int	pvr_vertex_dma_enabled (void)
	Is vertex DMA enabled?
void *	pvr_vertbuf_tail (pvr_list_t list)
	Retrieve a pointer to the current output location in the DMA buffer for the requested list.
void	pvr_vertbuf_written (pvr_list_t list, uint32_t amt)
	Notify the PVR system that data have been written into the output buffer for the given list.

Detailed Description

Use the DMA to transfer inactive lists to the PVR

Function Documentation

pvr_vertbuf_tail()

void * pvr_vertbuf_tail

(

pvr_list_t

list

)

Retrieve a pointer to the current output location in the DMA buffer for the requested list.

Vertex DMA must globally be enabled for this to work. Data may be added to this buffer by the user program directly; however, make sure to call pvr_vertbuf_written() to notify the system of any such changes.

Parameters

list	The primitive list to get the buffer for.

Returns

The tail of that list's buffer.

pvr_vertbuf_written()

void pvr_vertbuf_written	(	pvr_list_t	list,
		uint32_t	amt )

Notify the PVR system that data have been written into the output buffer for the given list.

This should always be done after writing data directly to these buffers or it will get overwritten by other data.

Parameters

list	The primitive list that was modified.
amt	Number of bytes written. Must be a multiple of 32.

pvr_vertex_dma_enabled()

int pvr_vertex_dma_enabled

(

void

)

Is vertex DMA enabled?

Returns

Non-zero if vertex DMA was enabled at init time