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// license:BSD-3-Clause
// copyright-holders:Raphael Nabet
/***************************************************************************
Texas Instruments TMS3556 Video Display Processor
***************************************************************************/
#ifndef MAME_VIDEO_TMS3556_H
#define MAME_VIDEO_TMS3556_H
#pragma once
///*************************************************************************
// MACROS / CONSTANTS
///*************************************************************************
/* if DOUBLE_WIDTH set, the horizontal resolution is doubled */
#define TMS3556_DOUBLE_WIDTH 0
///*************************************************************************
// TYPE DEFINITIONS
///*************************************************************************
// ======================> tms3556_device
class tms3556_device : public device_t, public device_memory_interface, public device_video_interface
{
public:
static constexpr unsigned TOP_BORDER = 1;
static constexpr unsigned BOTTOM_BORDER = 1;
static constexpr unsigned LEFT_BORDER = 8;
static constexpr unsigned RIGHT_BORDER = 8;
static constexpr unsigned TOTAL_WIDTH = 320 + LEFT_BORDER + RIGHT_BORDER;
static constexpr unsigned TOTAL_HEIGHT = 250 + TOP_BORDER + BOTTOM_BORDER;
// construction/destruction
tms3556_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
uint8_t vram_r();
void vram_w(uint8_t data);
uint8_t reg_r();
void reg_w(uint8_t data);
uint8_t initptr_r();
void interrupt();
uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
protected:
// device-level overrides
virtual void device_start() override;
// device_config_memory_interface overrides
virtual space_config_vector memory_space_config() const override;
private:
// address space configurations
const address_space_config m_space_config;
inline uint8_t readbyte(offs_t address);
inline void writebyte(offs_t address, uint8_t data);
void draw_line_empty(uint16_t *ln);
void draw_line_text_common(uint16_t *ln);
void draw_line_bitmap_common(uint16_t *ln);
void draw_line_text(uint16_t *ln);
void draw_line_bitmap(uint16_t *ln);
void draw_line_mixed(uint16_t *ln);
void draw_line(bitmap_ind16 &bmp, int line);
void interrupt_start_vblank(void);
void tms3556(address_map &map);
enum dma_mode_tt : u8 { dma_read, dma_write };
static constexpr uint8_t MODE_OFF = 0;
static constexpr uint8_t MODE_TEXT = 1;
static constexpr uint8_t MODE_BITMAP = 2;
static constexpr uint8_t MODE_MIXED = 3;
// registers
uint8_t m_control_regs[8];
uint16_t m_address_regs[8];
// register interface
uint8_t m_reg, m_reg2;
int m_row_col_written;
int m_bamp_written;
int m_colrow;
dma_mode_tt m_vdp_acmpxy_mode;
uint16_t m_vdp_acmpxy;
uint16_t m_vdp_acmp;
int m_init_read;
int m_scanline; // scanline counter
int m_blink, m_blink_count; // blinking
int m_bg_color; // background color for current line
int m_name_offset; // current offset in name table
int m_cg_flag; // c/g flag (mixed mode only)
int m_char_line_counter; // character line counter (decrements from 10, 0 when we have reached
// last line of character row)
int m_dbl_h_phase[40]; // double height phase flags (one per horizontal character position)
bitmap_ind16 m_bitmap;
};
// device type definition
DECLARE_DEVICE_TYPE(TMS3556, tms3556_device)
#endif // MAME_VIDEO_TMS3556_H
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