nesemu/include/ppu.h

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//
// Created by william on 12/30/23.
//
#include <stdbool.h>
#include <stddef.h>
#include "types.h"
#ifndef NESEMULATOR_PPU_H
#define NESEMULATOR_PPU_H
#define PPU_REGISTER_SIZE 0x8
#define PPU_VRAM_SIZE 0x4000
#define PPU_OAM_SIZE 0xff
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#define PPU_RAM_BASE_ADDR 0x2000
#define PPU_RAM_MAX_ADDR 0x4000
#define PPU_RAM_BANK_SIZE 0x8
#define PPU_RAM_BANK_COUNT ((PPU_RAM_MAX_ADDR - PPU_RAM_BASE_ADDR) / PPU_RAM_BANK_SIZE)
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#define PPU_REGISTER_CTRL 0x00
#define PPU_REGISTER_MASK 0x01
#define PPU_REGISTER_STATUS 0x02
#define PPU_REGISTER_OAM_ADDR 0x03
#define PPU_REGISTER_OAM_DATA 0x04
#define PPU_REGISTER_SCROLL 0x05
#define PPU_REGISTER_ADDR 0x06
#define PPU_REGISTER_DATA 0x07
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#define PPU_CTRL_SCROLL_X 0x1
#define PPU_CTRL_SCROLL_Y 0x2
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#define PPU_CTRL_BASE_NAMETABLE_ADDR 0x3
#define PPU_CTRL_VRAM_ADDR_INCREMENT 0x4
#define PPU_CTRL_SP_PATTERN_TABLE_ADDR 0x8
#define PPU_CTRL_BG_PATTERN_TABLE_ADDR 0x10
#define PPU_CTRL_SP_SIZE 0x20
#define PPU_CTRL_MODE_SELECT 0x40
#define PPU_CTRL_GEN_VBLANK_NMI 0x80
#define PPU_MASK_GREYSCALE 0x1
#define PPU_MASK_SHOW_BG_LEFT 0x2
#define PPU_MASK_SHOW_SP_LEFT 0x4
#define PPU_MASK_SHOW_BG 0x8
#define PPU_MASK_SHOW_SP 0x10
#define PPU_MASK_EMP_RED 0x20
#define PPU_MASK_EMP_GREEN 0x40
#define PPU_MASK_EMP_BLUE 0x80
#define PPU_STATUS_OPEN_BUS 0x1f
#define PPU_STATUS_SP_OVERFLOW 0x20
#define PPU_STATUS_SP_0_HIT 0x40
#define PPU_STATUS_VBLANK 0x80
#define PPU_MASK_NONE 0xff
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#define PATTERN_TABLE_SIZE 0x1000
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#define NAMETABLE_SIZE 0x0400
#define PALETTE_TABLE_SIZE 0x0020
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typedef struct ppu_memory {
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byte nametable_0[NAMETABLE_SIZE];
byte nametable_1[NAMETABLE_SIZE];
byte palette[PALETTE_TABLE_SIZE];
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} PPUMemory;
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typedef struct ppu_tile_fetch {
byte nametable;
byte attribute_table;
byte pattern_table_tile_low;
byte pattern_table_tile_high;
} PPUTileFetch;
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typedef struct ppu_pixel {
byte r;
byte g;
byte b;
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} PPUPixel;
typedef struct ppu_tile_queue {
PPUTileFetch first_fetch;
PPUTileFetch second_fetch;
PPUTileFetch displayed_fetch;
} PPUTileQueue;
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typedef struct ppu {
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PPUMemory memory;
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PPUPixel pixels[256 * 240];
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byte registers[8];
byte oam_dma_register;
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byte oam[PPU_OAM_SIZE];
bool odd_frame;
address v;
address t;
byte x;
bool w;
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byte x_scroll;
byte fine_x_scroll;
byte y_scroll;
byte ppu_addr_increment;
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address ppu_address;
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address temp_ppu_addr;
address bg_pattern_table_addr;
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PPUTileFetch fetch;
PPUTileQueue tile_queue;
// PPUTileFetch tile_fetch;
// PPUTileFetch fetch;
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unsigned long frame;
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unsigned int scanline;
unsigned int cycle;
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} PPU;
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PPU *ppu_get_state();
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/**
* Initializes the PPU, according to the power up state.
* https://www.nesdev.org/wiki/PPU_power_up_state
*
* @param ppu
*/
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void ppu_init();
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/**
* Cycles the PPU.
*
* @param ppu
* @param ram
*/
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void ppu_cycle();
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/**
* Read a flag from the PPU registers.
*
* @param reg The register index
* @param mask The flag mask
*/
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bool ppu_read_flag(size_t reg, byte mask);
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/**
* Read a value from the PPU registers. Does not apply any offset to the value, a mask of 0x20 will either result in 0x20 (true) or 0x0 (false).
* Read a value from the PPU registers. Does not apply any offset to the value, a mask of 0x20 will either result in 0x20 (true) or 0x0 (false).
*
* @param reg The register index
* @param mask The value mask
*/
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//void ppu_sig_read_register(byte reg);
//
//void ppu_sig_write_register(byte reg);
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byte ppu_read_reg(byte reg);
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void ppu_write_reg(byte reg, byte data);
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void ppu_write_oamaddr(byte data);
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void ppu_write(address addr, byte data);
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#endif //NESEMULATOR_PPU_H