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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/*********************************************************************
bufsprite.h
Buffered Sprite RAM device.
*********************************************************************/
#ifndef MAME_VIDEO_BUFSPRITE_H
#define MAME_VIDEO_BUFSPRITE_H
#pragma once
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
// device type definition
DECLARE_DEVICE_TYPE(BUFFERED_SPRITERAM8, buffered_spriteram8_device)
DECLARE_DEVICE_TYPE(BUFFERED_SPRITERAM16, buffered_spriteram16_device)
DECLARE_DEVICE_TYPE(BUFFERED_SPRITERAM32, buffered_spriteram32_device)
DECLARE_DEVICE_TYPE(BUFFERED_SPRITERAM64, buffered_spriteram64_device)
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> buffered_spriteram_device
// base class to manage buffered spriteram
template <typename Type>
class buffered_spriteram_device : public device_t
{
public:
// getters
Type *live() const { return m_spriteram; }
Type *buffer() { return &m_buffered[0]; }
uint32_t bytes() const { return m_spriteram.bytes(); }
uint32_t length() const { return bytes() / sizeof(Type); }
// operations
Type *copy(uint32_t srcoffset = 0, uint32_t srclength = 0x7fffffff)
{
assert(m_spriteram != nullptr);
if (m_spriteram != nullptr)
memcpy(&m_buffered[0], m_spriteram + srcoffset, (std::min<size_t>)(srclength, length() - srcoffset) * sizeof(Type));
return &m_buffered[0];
}
// read/write handlers
void write(address_space &space, offs_t offset, Type data, Type mem_mask = ~Type(0)) { copy(); }
// VBLANK handlers
void vblank_copy_rising(int state) { if (state) copy(); }
void vblank_copy_falling(int state) { if (!state) copy(); }
protected:
// construction
buffered_spriteram_device(
const machine_config &mconfig,
device_type type,
const char *tag,
device_t *owner,
uint32_t clock);
// first-time setup
virtual void device_start() override;
private:
// internal state
required_shared_ptr<Type> m_spriteram;
std::vector<Type> m_buffered;
};
// ======================> buffered_spriteram8_device
class buffered_spriteram8_device : public buffered_spriteram_device<uint8_t>
{
public:
// construction
buffered_spriteram8_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
};
// ======================> buffered_spriteram16_device
class buffered_spriteram16_device : public buffered_spriteram_device<uint16_t>
{
public:
// construction
buffered_spriteram16_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
};
// ======================> buffered_spriteram32_device
class buffered_spriteram32_device : public buffered_spriteram_device<uint32_t>
{
public:
// construction
buffered_spriteram32_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
};
// ======================> buffered_spriteram64_device
class buffered_spriteram64_device : public buffered_spriteram_device<uint64_t>
{
public:
// construction
buffered_spriteram64_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
};
#endif // MAME_VIDEO_BUFSPRITE_H
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