/*************************************************************************************** * Genesis Plus * CD graphics processor * * Copyright (C) 2012-2024 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 length); extern void word_ram_1_dma_w(unsigned int length); extern void word_ram_2M_dma_w(unsigned int length); /***************************************************************/ /* 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