Texturing

API for managing PowerVR textures More...

Topics
	Flags
	Texture loading constants
	Formats
	PowerVR texture formats

Functions
void	pvr_txr_load (const void *src, pvr_ptr_t dst, uint32_t count)
	Load raw texture data from an SH-4 buffer into PVR RAM.
void	pvr_txr_load_ex (const void *src, pvr_ptr_t dst, uint32_t w, uint32_t h, uint32_t flags)
	Load texture data from an SH-4 buffer into PVR RAM, twiddling it in the process.
void	pvr_txr_load_kimg (const kos_img_t *img, pvr_ptr_t dst, uint32_t flags)
	Load a KOS Platform Independent Image (subject to constraint checking).

Detailed Description

API for managing PowerVR textures

Helper functions for handling texture tasks of various kinds.

Function Documentation

pvr_txr_load()

void pvr_txr_load	(	const void *	src,
		pvr_ptr_t	dst,
		uint32_t	count )

Load raw texture data from an SH-4 buffer into PVR RAM.

This essentially just acts as a memcpy() from main RAM to PVR RAM, using the Store Queues and 64-bit TA bus.

Parameters

src	The location in main RAM holding the texture.
dst	The location in PVR RAM to copy to.
count	The size of the texture in bytes (must be a multiple of 32).

pvr_txr_load_ex()

void pvr_txr_load_ex	(	const void *	src,
		pvr_ptr_t	dst,
		uint32_t	w,
		uint32_t	h,
		uint32_t	flags )

Load texture data from an SH-4 buffer into PVR RAM, twiddling it in the process.

This function loads a texture to the PVR's RAM with the specified set of flags. It will currently always twiddle the data, whether you ask it to or not, and many of the parameters are just plain not supported at all... Pretty much the only supported flag, other than the format ones is the PVR_TXRLOAD_INVERT_Y one.

This will be slower than using pvr_txr_load() in pretty much all cases, so unless you need to twiddle your texture, just use that instead.

Parameters

src	The location to copy from.
dst	The location to copy to.
w	The width of the texture, in pixels.
h	The height of the texture, in pixels.
flags	Some set of flags, ORed together.

See also

Flags

pvr_txr_load_kimg()

void pvr_txr_load_kimg	(	const kos_img_t *	img,
		pvr_ptr_t	dst,
		uint32_t	flags )

Load a KOS Platform Independent Image (subject to constraint checking).

This function loads a KOS Platform Independent image to the PVR's RAM with the specified set of flags. This function, unlike pvr_txr_load_ex() supports everything in the flags available, other than what's explicitly marked as not supported.

Parameters

img	The image to load.
dst	The location to copy to.
flags	Some set of flags, ORed together.

See also

Flags

Note

Unless you explicitly tell this function to not twiddle the texture (by ORing PVR_TXRLOAD_FMT_NOTWIDDLE or it's equivalent PVR_TXRLOAD_FMT_TWIDDLED with flags), this function will twiddle the texture while loading. Keep that in mind when setting the texture format in polygon headers later.

You cannot specify both PVR_TXRLOAD_FMT_NOTWIDDLE (or equivalently PVR_TXRLOAD_FMT_TWIDDLED) and PVR_TXRLOAD_INVERT_Y in the flags.

DMA and Store Queue based loading is not available from this function if it twiddles the texture while loading.