_b8PpuLoadimg Struct Reference

Structure representing an image loading command for the PPU (Pixel Processing Unit). More...

#include <ppu.h>

Public Attributes
unsigned	na0: 24
unsigned	code: 8
const u8 *	cpuaddr
unsigned	na1: 8
unsigned	srcwtile: 6
unsigned	na2: 2
unsigned	srcytile: 6
unsigned	na3: 2
unsigned	srcxtile: 6
unsigned	na4: 2
unsigned	trnhtile: 6
unsigned	na5: 2
unsigned	trnwtile: 6
unsigned	na6: 2
unsigned	dstytile: 6
unsigned	na7: 2
unsigned	dstxtile: 6
unsigned	na8: 2

Detailed Description

Structure representing an image loading command for the PPU (Pixel Processing Unit).

The BEEP-8 system uses tiles of size 8x8 pixels as the basic unit for BG (background) and SPRITE references. BEEP-8 has VRAM located in a different space from CPU memory, with a format of 64 tiles by 64 tiles. Both sprites and backgrounds can only reference VRAM.

The b8PpuLoadimg structure is used to transfer tile compositions stored in CPU memory to VRAM.

Member Data Documentation

code

unsigned _b8PpuLoadimg::code

Command code for the image loading operation.

cpuaddr

const u8* _b8PpuLoadimg::cpuaddr

Pointer to the tile data in CPU memory.

dstxtile

unsigned _b8PpuLoadimg::dstxtile

X-coordinate in tiles of the destination in VRAM.

dstytile

unsigned _b8PpuLoadimg::dstytile

Y-coordinate in tiles of the destination in VRAM.

na0

unsigned _b8PpuLoadimg::na0

Reserved, not used.

na1

unsigned _b8PpuLoadimg::na1

Reserved, not used.

na2

unsigned _b8PpuLoadimg::na2

Reserved, not used.

na3

unsigned _b8PpuLoadimg::na3

Reserved, not used.

na4

unsigned _b8PpuLoadimg::na4

Reserved, not used.

na5

unsigned _b8PpuLoadimg::na5

Reserved, not used.

na6

unsigned _b8PpuLoadimg::na6

Reserved, not used.

na7

unsigned _b8PpuLoadimg::na7

Reserved, not used.

na8

unsigned _b8PpuLoadimg::na8

Reserved, not used.

srcwtile

unsigned _b8PpuLoadimg::srcwtile

Width of the source image in tiles.

srcxtile

unsigned _b8PpuLoadimg::srcxtile

X-coordinate in tiles of the source image.

srcytile

unsigned _b8PpuLoadimg::srcytile

Y-coordinate in tiles of the source image.

trnhtile

unsigned _b8PpuLoadimg::trnhtile

Height of the transfer region in tiles.

trnwtile

unsigned _b8PpuLoadimg::trnwtile

Width of the transfer region in tiles.

---

The documentation for this struct was generated from the following file:

• include/b8/ppu.h