81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
#ifndef _ZP_VARIABLES_
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#define _ZP_VARIABLES_
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#include "type.h"
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// NMI Flags to activate graphical update
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// Note: You cannot activate all updates.
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// You need to have a execution time
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// < ~2273 cycles (2000 to be sure)
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// 7 bit 0
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// ---- ----
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// E..R PASB
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// | | ||||
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// | | |||+- Background tiles update
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// | | ||| Execution time depend on data
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// | | ||| (cycles ~= 16 + 38*p + for i:p do (14*p[i].n))
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// | | ||| (p=packet number, p[i].n = packet data size)
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// | | ||+-- Sprites update (513+ cycles)
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// | | |+--- Nametables attributes update (821 cycles)
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// | | +---- Palettes update (356 cycles)
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// | +------ Scroll update (31 cycles)
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// +--------- 1 when NMI has ended, should be set to 0 after reading.
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// If let to 1, it means the NMI is disable
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extern uint8_t nmi_flags;
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#pragma zpsym ("nmi_flags")
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// Scroll X position
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extern uint8_t scroll_x;
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#pragma zpsym ("scroll_x")
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// Scroll Y position
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extern uint8_t scroll_y;
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#pragma zpsym ("scroll_y")
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// Nametable high adress to update attributes for
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// $23 = Nametable 1
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// $27 = Nametable 2
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// $2B = Nametable 3
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// $2F = Nametable 4
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extern uint8_t atr_nametable;
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#pragma zpsym ("atr_nametable")
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// value of the PPU_MASK (need to be refresh manually)
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extern uint8_t ppu_ctrl_val;
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#pragma zpsym ("ppu_ctrl_val")
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// Attributes data to send to PPU during VBLANK
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#define ATTRIBUTES_SIZE 64
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extern uint8_t attributes[ATTRIBUTES_SIZE];
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#pragma zpsym ("attributes")
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// Palettes data to send to PPU during VBLANK
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// byte 0 = transparente color
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// byte 1-3 = background palette 1
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// byte 4-6 = background palette 2
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// ...
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// byte 13-16 = sprite palette 1
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// ...
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#define PALETTES_SIZE 25
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extern uint8_t palettes[PALETTES_SIZE];
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#pragma zpsym ("palettes")
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// Background data to send to PPU during VBLANK
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// Packet structure:
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// byte 0 = v.ssssss (v= vertical draw, s= size)
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// byte 1-2 = ppu adress
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// byte 3-s = tile data
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// packet of size 0 means there is no more data to draw
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#define BACKGROUND_SIZE 128
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extern uint8_t background[BACKGROUND_SIZE];
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#pragma zpsym ("background")
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#endif // _ZP_VARIABLES_
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