vdp_unsafe.h

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// -*- coding: utf-8-unix -*-
/*
 * Copyright (c) 2021-2024 Daishi Mori (mori0091)
 *
 * This software is released under the MIT License.\n
 * See https://github.com/mori0091/libmsx/blob/main/LICENSE
 *
 * GitHub libmsx project\n
 * https://github.com/mori0091/libmsx
 */
#pragma once
 
#ifndef VDP_UNSAFE_H_
#define VDP_UNSAFE_H_
 
#include <stdint.h>
 
#include "io.h"
#include "vmem.h"
#include "bios.h"
 
inline void VDP_SET_CONTROL_REGISTER(uint8_t reg, uint8_t val) {
  vdp_port1 = val;
  vdp_port1 = reg | 0x80;
}
 
inline void VDP_SET_CONTROL_REGISTER_POINTER(uint8_t reg) {
  VDP_SET_CONTROL_REGISTER(17, reg | 0x80);
}
 
inline void VDP_SET_CONTROL_REGISTER_POINTER_AUTO_INCREMENT(uint8_t reg) {
  VDP_SET_CONTROL_REGISTER(17, reg);
}
 
inline void VDP_SET_CONTROL_REGISTER_VALUE(uint8_t val) {
  vdp_port3 = val;
}
 
inline void VDP_SET_STATUS_REGISTER_POINTER(uint8_t reg) {
  VDP_SET_CONTROL_REGISTER(15, reg);
}
 
inline uint8_t VDP_GET_STATUS_REGISTER_VALUE(void) {
  return vdp_port1;
}
 
inline void VDP_SET_VMEM_WRITE_POINTER(vmemptr_t loc) {
  if (0 < msx_get_version()) {
    VDP_SET_CONTROL_REGISTER(14, (uint8_t)(((loc) >> 14) & 7));
  }
  vdp_port1 = (uint8_t)((loc) & 255);
  vdp_port1 = (uint8_t)(((loc) >> 8) & 0x3F | 0x40);
}
 
inline void VDP_SET_VMEM_READ_POINTER(vmemptr_t loc) {
  if (0 < msx_get_version()) {
    VDP_SET_CONTROL_REGISTER(14, (uint8_t)(((loc) >> 14) & 7));
  }
  vdp_port1 = (uint8_t)((loc) & 255);
  vdp_port1 = (uint8_t)(((loc) >> 8) & 0x3F);
}
 
inline void VDP_SET_VMEM_VALUE(uint8_t val) {
  vdp_port0 = val;
}
 
inline uint8_t VDP_GET_VMEM_VALUE(void) {
  return vdp_port0;
}
 
#endif // VDP_UNSAFE_H_