96 lines
1.7 KiB
C
96 lines
1.7 KiB
C
#pragma once
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#include <common.h>
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static const int LINES_PER_FRAME = 154;
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static const int TICKS_PER_LINE = 456;
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static const int YRES = 144;
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static const int XRES = 160;
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static u32 target_frame_time;
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bool window_visible();
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typedef enum {
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FS_TILE,
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FS_DATA0,
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FS_DATA1,
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FS_IDLE,
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FS_PUSH
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} fetch_state;
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typedef struct _fifo_entry {
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struct _fifo_entry *next;
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u32 value;
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} fifo_entry;
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typedef struct {
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fifo_entry *head;
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fifo_entry *tail;
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u32 size; //32 bit color
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} fifo;
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typedef struct {
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fetch_state cur_fetch_state;
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fifo pixel_fifo;
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u8 line_x;
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u8 pushed_x;
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u8 fetch_x;
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u8 bgw_fetch_data[3];
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u8 fetch_entry_data[6]; //oam data
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u8 map_y;
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u8 map_x;
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u8 tile_y;
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u8 fifo_x;
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} pixel_fifo_context;
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typedef struct {
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u8 y;
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u8 x;
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u8 tile;
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u8 f_cgb_pn : 3;
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u8 f_cgb_vram_bank : 1;
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u8 f_pn : 1;
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u8 f_x_flip : 1;
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u8 f_y_flip : 1;
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u8 f_bgp : 1;
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} oam_entry;
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typedef struct _oam_line_entry {
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oam_entry entry;
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struct _oam_line_entry *next;
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} oam_line_entry;
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typedef struct {
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oam_entry oam_ram[40];
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u8 vram[0x2000];
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u8 line_sprite_count; // 0 to 10 sprites
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oam_line_entry *line_sprites; //linked list of sprites
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oam_line_entry line_entry_array[10]; //memory to use for list
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u8 fetched_entry_count;
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oam_entry fetched_entries[3]; //entries fetched during pipeline
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u8 window_line;
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pixel_fifo_context pfc;
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u32 current_frame;
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u32 line_ticks;
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u32 *video_buffer;
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bool rendering_window;
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} ppu_context;
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void ppu_init();
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void ppu_tick();
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void ppu_oam_write(u16 address, u8 value);
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u8 ppu_oam_read(u16 address);
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void ppu_vram_write(u16 address, u8 value);
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u8 ppu_vram_read(u16 address);
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ppu_context *ppu_get_context();
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