47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
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//
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// Created by william on 12/30/23.
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//
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#include <stddef.h>
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#include "../include/ppu.h"
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void ppu_init(PPU *ppu, byte *registers_ram, byte *oam_dma_register) {
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ppu->registers = registers_ram;
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ppu->registers[PPU_REGISTER_CTRL] = 0x00;
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ppu->registers[PPU_REGISTER_MASK] = 0x00;
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ppu->registers[PPU_REGISTER_STATUS] = 0x00;
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ppu->registers[PPU_REGISTER_OAM_ADDR] = 0x00;
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ppu->registers[PPU_REGISTER_OAM_DATA] = 0x00;
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ppu->registers[PPU_REGISTER_SCROLL] = 0x00;
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ppu->registers[PPU_REGISTER_ADDR] = 0x00;
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ppu->registers[PPU_REGISTER_DATA] = 0x00;
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ppu->oam_dma_register = oam_dma_register;
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ppu->odd_frame = false;
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}
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void ppu_cycle(PPU *ppu) {
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}
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bool ppu_read_flag(PPU *ppu, size_t reg, byte mask) {
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return ppu->registers[reg] & mask;
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}
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//byte ppu_read_register(PPU *ppu, size_t reg, byte mask) {
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// return ppu->registers[reg] & mask;
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//}
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void ppu_read_register(PPU *ppu, byte reg) {
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if (reg == PPU_REGISTER_STATUS) {
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ppu->w = false;
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}
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}
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void ppu_write_register(PPU *ppu, byte reg) {
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if (reg == PPU_REGISTER_SCROLL || reg == PPU_REGISTER_ADDR) {
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ppu->w = !ppu->w;
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}
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if (reg == PPU_REGISTER_OAM_DATA) {
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ppu->registers[PPU_REGISTER_OAM_ADDR]++;
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}
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}
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