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/***************************************************************************************
* Genesis Plus
* CD graphics processor
*
* Copyright (C) 2012 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
*
* - Redistributions may not be sold, nor may they be used in a commercial
* product or activity.
*
* - Redistributions that are modified from the original source must include the
* complete source code, including the source code for all components used by a
* binary built from the modified sources. However, as a special exception, the
* source code distributed need not include anything that is normally distributed
* (in either source or binary form) with the major components (compiler, kernel,
* and so on) of the operating system on which the executable runs, unless that
* component itself accompanies the executable.
*
* - Redistributions must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************************/
#ifndef _CD_GFX_
#define _CD_GFX_
#define gfx scd.gfx_hw
typedef struct
{
uint32 cycles; /* current cycles count for graphics operation */
uint32 cyclesPerLine; /* current graphics operation timings */
uint32 dotMask; /* stamp map size mask */
uint16 *tracePtr; /* trace vector pointer */
uint16 *mapPtr; /* stamp map table base address */
uint8 stampShift; /* stamp pixel shift value (related to stamp size) */
uint8 mapShift; /* stamp map table shift value (related to stamp map size) */
uint16 bufferOffset; /* image buffer column offset */
uint32 bufferStart; /* image buffer start index */
uint16 lut_offset[0x8000]; /* Cell Image -> WORD-RAM offset lookup table (1M Mode) */
uint8 lut_prio[4][0x100][0x100]; /* WORD-RAM data writes priority lookup table */
uint8 lut_pixel[0x200]; /* Graphics operation dot offset lookup table */
uint8 lut_cell[0x100]; /* Graphics operation stamp offset lookup table */
} gfx_t;
/***************************************************************/
/* WORD-RAM DMA interfaces (1M & 2M modes) */
/***************************************************************/
extern void word_ram_0_dma_w(unsigned int words);
extern void word_ram_1_dma_w(unsigned int words);
extern void word_ram_2M_dma_w(unsigned int words);
/***************************************************************/
/* WORD-RAM 0 & 1 CPU interfaces (1M mode) */
/***************************************************************/
extern unsigned int word_ram_0_read16(unsigned int address);
extern unsigned int word_ram_1_read16(unsigned int address);
extern void word_ram_0_write16(unsigned int address, unsigned int data);
extern void word_ram_1_write16(unsigned int address, unsigned int data);
extern unsigned int word_ram_0_read8(unsigned int address);
extern unsigned int word_ram_1_read8(unsigned int address);
extern void word_ram_0_write8(unsigned int address, unsigned int data);
extern void word_ram_1_write8(unsigned int address, unsigned int data);
/***************************************************************/
/* WORD-RAM 0 & 1 DOT image SUB-CPU interface (1M mode) */
/***************************************************************/
extern unsigned int dot_ram_0_read16(unsigned int address);
extern unsigned int dot_ram_1_read16(unsigned int address);
extern void dot_ram_0_write16(unsigned int address, unsigned int data);
extern void dot_ram_1_write16(unsigned int address, unsigned int data);
extern unsigned int dot_ram_0_read8(unsigned int address);
extern unsigned int dot_ram_1_read8(unsigned int address);
extern void dot_ram_0_write8(unsigned int address, unsigned int data);
extern void dot_ram_1_write8(unsigned int address, unsigned int data);
/***************************************************************/
/* WORD-RAM 0 & 1 CELL image MAIN-CPU interface (1M mode) */
/***************************************************************/
extern unsigned int cell_ram_0_read16(unsigned int address);
extern unsigned int cell_ram_1_read16(unsigned int address);
extern void cell_ram_0_write16(unsigned int address, unsigned int data);
extern void cell_ram_1_write16(unsigned int address, unsigned int data);
extern unsigned int cell_ram_0_read8(unsigned int address);
extern unsigned int cell_ram_1_read8(unsigned int address);
extern void cell_ram_0_write8(unsigned int address, unsigned int data);
extern void cell_ram_1_write8(unsigned int address, unsigned int data);
/***************************************************************/
/* Rotation / Scaling operation (2M mode) */
/***************************************************************/
extern void gfx_init(void);
extern void gfx_reset(void);
extern int gfx_context_save(uint8 *state);
extern int gfx_context_load(uint8 *state);
extern void gfx_start(unsigned int base, int cycles);
extern void gfx_update(int cycles);
#endif
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