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https://github.com/ekeeke/Genesis-Plus-GX.git
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117 lines
6.1 KiB
C
117 lines
6.1 KiB
C
/***************************************************************************************
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* Genesis Plus
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* CD graphics processor
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*
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* Copyright (C) 2012-2024 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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*
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* - Redistributions may not be sold, nor may they be used in a commercial
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* product or activity.
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*
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* - Redistributions that are modified from the original source must include the
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* complete source code, including the source code for all components used by a
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* binary built from the modified sources. However, as a special exception, the
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* source code distributed need not include anything that is normally distributed
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* (in either source or binary form) with the major components (compiler, kernel,
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* and so on) of the operating system on which the executable runs, unless that
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* component itself accompanies the executable.
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*
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* - Redistributions must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************************/
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#ifndef _CD_GFX_
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#define _CD_GFX_
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#define gfx scd.gfx_hw
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typedef struct
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{
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uint32 cycles; /* current cycles count for graphics operation */
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uint32 cyclesPerLine; /* current graphics operation timings */
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uint32 dotMask; /* stamp map size mask */
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uint16 *tracePtr; /* trace vector pointer */
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uint16 *mapPtr; /* stamp map table base address */
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uint8 stampShift; /* stamp pixel shift value (related to stamp size) */
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uint8 mapShift; /* stamp map table shift value (related to stamp map size) */
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uint16 bufferOffset; /* image buffer column offset */
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uint32 bufferStart; /* image buffer start index */
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uint16 lut_offset[0x8000]; /* Cell Image -> WORD-RAM offset lookup table (1M Mode) */
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uint8 lut_prio[4][0x100][0x100]; /* WORD-RAM data writes priority lookup table */
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uint8 lut_pixel[0x200]; /* Graphics operation dot offset lookup table */
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uint8 lut_cell[0x100]; /* Graphics operation stamp offset lookup table */
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} gfx_t;
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/***************************************************************/
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/* WORD-RAM DMA interfaces (1M & 2M modes) */
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/***************************************************************/
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extern void word_ram_0_dma_w(unsigned int length);
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extern void word_ram_1_dma_w(unsigned int length);
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extern void word_ram_2M_dma_w(unsigned int length);
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/***************************************************************/
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/* WORD-RAM 0 & 1 CPU interfaces (1M mode) */
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/***************************************************************/
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extern unsigned int word_ram_0_read16(unsigned int address);
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extern unsigned int word_ram_1_read16(unsigned int address);
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extern void word_ram_0_write16(unsigned int address, unsigned int data);
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extern void word_ram_1_write16(unsigned int address, unsigned int data);
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extern unsigned int word_ram_0_read8(unsigned int address);
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extern unsigned int word_ram_1_read8(unsigned int address);
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extern void word_ram_0_write8(unsigned int address, unsigned int data);
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extern void word_ram_1_write8(unsigned int address, unsigned int data);
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/***************************************************************/
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/* WORD-RAM 0 & 1 DOT image SUB-CPU interface (1M mode) */
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/***************************************************************/
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extern unsigned int dot_ram_0_read16(unsigned int address);
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extern unsigned int dot_ram_1_read16(unsigned int address);
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extern void dot_ram_0_write16(unsigned int address, unsigned int data);
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extern void dot_ram_1_write16(unsigned int address, unsigned int data);
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extern unsigned int dot_ram_0_read8(unsigned int address);
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extern unsigned int dot_ram_1_read8(unsigned int address);
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extern void dot_ram_0_write8(unsigned int address, unsigned int data);
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extern void dot_ram_1_write8(unsigned int address, unsigned int data);
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/***************************************************************/
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/* WORD-RAM 0 & 1 CELL image MAIN-CPU interface (1M mode) */
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/***************************************************************/
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extern unsigned int cell_ram_0_read16(unsigned int address);
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extern unsigned int cell_ram_1_read16(unsigned int address);
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extern void cell_ram_0_write16(unsigned int address, unsigned int data);
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extern void cell_ram_1_write16(unsigned int address, unsigned int data);
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extern unsigned int cell_ram_0_read8(unsigned int address);
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extern unsigned int cell_ram_1_read8(unsigned int address);
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extern void cell_ram_0_write8(unsigned int address, unsigned int data);
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extern void cell_ram_1_write8(unsigned int address, unsigned int data);
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/***************************************************************/
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/* Rotation / Scaling operation (2M mode) */
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/***************************************************************/
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extern void gfx_init(void);
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extern void gfx_reset(void);
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extern int gfx_context_save(uint8 *state);
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extern int gfx_context_load(uint8 *state);
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extern void gfx_start(unsigned int base, int cycles);
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extern void gfx_update(int cycles);
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#endif
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