mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-10-27 21:48:50 +01:00
93f9619ed8
scripted find/replace gives slightly better code on ARM, less unnecessary asm, ~400 bytes saved
451 lines
14 KiB
C
451 lines
14 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 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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#include "../pico_int.h"
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#include "genplus_macros.h"
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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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uint32 y_step; /* pico: render line step */
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uint8 lut_prio[4][0x10][0x10]; /* 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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static gfx_t gfx;
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static void gfx_schedule(void);
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/***************************************************************/
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/* Rotation / Scaling operation (2M Mode) */
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/***************************************************************/
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void gfx_init(void)
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{
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int i, j;
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uint8 mask, row, col, temp;
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memset(&gfx, 0, sizeof(gfx));
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/* Initialize priority modes lookup table */
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for (i = 0; i < 0x10; i++)
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{
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for (j = 0; j < 0x10; j++)
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{
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/* normal */
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gfx.lut_prio[0][i][j] = j;
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/* underwrite */
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gfx.lut_prio[1][i][j] = i ? i : j;
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/* overwrite */
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gfx.lut_prio[2][i][j] = j ? j : i;
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/* invalid */
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gfx.lut_prio[3][i][j] = i;
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}
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}
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/* Initialize cell lookup table */
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/* table entry = yyxxshrr (8 bits) */
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/* with: yy = cell row (0-3) */
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/* xx = cell column (0-3) */
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/* s = stamp size (0=16x16, 1=32x32) */
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/* hrr = HFLIP & ROTATION bits */
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for (i=0; i<0x100; i++)
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{
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/* one stamp = 2x2 cells (16x16) or 4x4 cells (32x32) */
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mask = (i & 8) ? 3 : 1;
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row = (i >> 6) & mask;
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col = (i >> 4) & mask;
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if (i & 4) { col = col ^ mask; } /* HFLIP (always first) */
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if (i & 2) { col = col ^ mask; row = row ^ mask; } /* ROLL1 */
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if (i & 1) { temp = col; col = row ^ mask; row = temp; } /* ROLL0 */
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/* cell offset (0-3 or 0-15) */
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gfx.lut_cell[i] = row + col * (mask + 1);
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}
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/* Initialize pixel lookup table */
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/* table entry = yyyxxxhrr (9 bits) */
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/* with: yyy = pixel row (0-7) */
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/* xxx = pixel column (0-7) */
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/* hrr = HFLIP & ROTATION bits */
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for (i=0; i<0x200; i++)
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{
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/* one cell = 8x8 pixels */
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row = (i >> 6) & 7;
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col = (i >> 3) & 7;
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if (i & 4) { col = col ^ 7; } /* HFLIP (always first) */
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if (i & 2) { col = col ^ 7; row = row ^ 7; } /* ROLL1 */
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if (i & 1) { temp = col; col = row ^ 7; row = temp; } /* ROLL0 */
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/* pixel offset (0-63) */
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gfx.lut_pixel[i] = col + row * 8;
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}
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}
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int gfx_context_save(uint8 *state)
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{
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uint32 tmp32;
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int bufferptr = 0;
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//save_param(&gfx.cycles, sizeof(gfx.cycles));
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//save_param(&gfx.cyclesPerLine, sizeof(gfx.cyclesPerLine));
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save_param(&gfx.dotMask, sizeof(gfx.dotMask));
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save_param(&gfx.stampShift, sizeof(gfx.stampShift));
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save_param(&gfx.mapShift, sizeof(gfx.mapShift));
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save_param(&gfx.bufferOffset, sizeof(gfx.bufferOffset));
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save_param(&gfx.bufferStart, sizeof(gfx.bufferStart));
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tmp32 = (uint8 *)(gfx.tracePtr) - Pico_mcd->word_ram2M;
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save_param(&tmp32, 4);
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tmp32 = (uint8 *)(gfx.mapPtr) - Pico_mcd->word_ram2M;
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save_param(&tmp32, 4);
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save_param(&gfx.y_step, sizeof(gfx.y_step));
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return bufferptr;
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}
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int gfx_context_load(const uint8 *state)
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{
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uint32 tmp32;
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int bufferptr = 0;
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//load_param(&gfx.cycles, sizeof(gfx.cycles));
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//load_param(&gfx.cyclesPerLine, sizeof(gfx.cyclesPerLine));
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load_param(&gfx.dotMask, sizeof(gfx.dotMask));
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load_param(&gfx.stampShift, sizeof(gfx.stampShift));
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load_param(&gfx.mapShift, sizeof(gfx.mapShift));
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load_param(&gfx.bufferOffset, sizeof(gfx.bufferOffset));
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load_param(&gfx.bufferStart, sizeof(gfx.bufferStart));
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load_param(&tmp32, 4);
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gfx.tracePtr = (uint16 *)(Pico_mcd->word_ram2M + tmp32);
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load_param(&tmp32, 4);
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gfx.mapPtr = (uint16 *)(Pico_mcd->word_ram2M + tmp32);
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load_param(&gfx.y_step, sizeof(gfx.y_step));
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return bufferptr;
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}
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static void gfx_render(uint32 bufferIndex, uint32 width)
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{
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uint8 pixel_in, pixel_out;
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uint16 stamp_data;
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uint32 stamp_index;
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uint32 priority;
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/* pixel map start position for current line (13.3 format converted to 13.11) */
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uint32 xpos = *gfx.tracePtr++ << 8;
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uint32 ypos = *gfx.tracePtr++ << 8;
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/* pixel map offset values for current line (5.11 format) */
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uint32 xoffset = (int16) *gfx.tracePtr++;
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uint32 yoffset = (int16) *gfx.tracePtr++;
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priority = (Pico_mcd->s68k_regs[2] << 8) | Pico_mcd->s68k_regs[3];
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priority = (priority >> 3) & 0x03;
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/* process all dots */
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while (width--)
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{
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/* check if stamp map is repeated */
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if (Pico_mcd->s68k_regs[0x58+1] & 0x01)
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{
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/* stamp map range */
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xpos &= gfx.dotMask;
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ypos &= gfx.dotMask;
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}
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else
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{
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/* 24-bit range */
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xpos &= 0xffffff;
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ypos &= 0xffffff;
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}
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/* check if pixel is outside stamp map */
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if ((xpos | ypos) & ~gfx.dotMask)
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{
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/* force pixel output to 0 */
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pixel_out = 0x00;
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}
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else
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{
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/* read stamp map table data */
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stamp_data = gfx.mapPtr[(xpos >> gfx.stampShift) | ((ypos >> gfx.stampShift) << gfx.mapShift)];
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/* stamp generator base index */
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/* sss ssssssss ccyyyxxx (16x16) or sss sssssscc ccyyyxxx (32x32) */
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/* with: s = stamp number (1 stamp = 16x16 or 32x32 pixels) */
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/* c = cell offset (0-3 for 16x16, 0-15 for 32x32) */
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/* yyy = line offset (0-7) */
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/* xxx = pixel offset (0-7) */
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stamp_index = (stamp_data & 0x7ff) << 8;
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if (stamp_index)
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{
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/* extract HFLIP & ROTATION bits */
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stamp_data = (stamp_data >> 13) & 7;
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/* cell offset (0-3 or 0-15) */
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/* table entry = yyxxshrr (8 bits) */
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/* with: yy = cell row (0-3) = (ypos >> (11 + 3)) & 3 */
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/* xx = cell column (0-3) = (xpos >> (11 + 3)) & 3 */
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/* s = stamp size (0=16x16, 1=32x32) */
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/* hrr = HFLIP & ROTATION bits */
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stamp_index |= gfx.lut_cell[
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stamp_data | ((Pico_mcd->s68k_regs[0x58+1] & 0x02) << 2 )
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| ((ypos >> 8) & 0xc0) | ((xpos >> 10) & 0x30)] << 6;
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/* pixel offset (0-63) */
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/* table entry = yyyxxxhrr (9 bits) */
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/* with: yyy = pixel row (0-7) = (ypos >> 11) & 7 */
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/* xxx = pixel column (0-7) = (xpos >> 11) & 7 */
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/* hrr = HFLIP & ROTATION bits */
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stamp_index |= gfx.lut_pixel[stamp_data | ((xpos >> 8) & 0x38) | ((ypos >> 5) & 0x1c0)];
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/* read pixel pair (2 pixels/byte) */
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pixel_out = READ_BYTE(Pico_mcd->word_ram2M, stamp_index >> 1);
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/* extract left or rigth pixel */
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if (stamp_index & 1)
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{
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pixel_out &= 0x0f;
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}
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else
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{
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pixel_out >>= 4;
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}
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}
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else
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{
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/* stamp 0 is not used: force pixel output to 0 */
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pixel_out = 0x00;
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}
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}
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/* read out paired pixel data */
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pixel_in = READ_BYTE(Pico_mcd->word_ram2M, bufferIndex >> 1);
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/* update left or rigth pixel */
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if (bufferIndex & 1)
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{
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/* priority mode write */
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pixel_out = gfx.lut_prio[priority][pixel_in & 0x0f][pixel_out];
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pixel_out |= (pixel_in & 0xf0);
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}
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else
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{
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/* priority mode write */
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pixel_out = gfx.lut_prio[priority][pixel_in >> 4][pixel_out];
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pixel_out = (pixel_out << 4) | (pixel_in & 0x0f);
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}
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/* write data to image buffer */
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WRITE_BYTE(Pico_mcd->word_ram2M, bufferIndex >> 1, pixel_out);
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/* check current pixel position */
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if ((bufferIndex & 7) != 7)
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{
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/* next pixel */
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bufferIndex++;
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}
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else
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{
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/* next cell: increment image buffer offset by one column (minus 7 pixels) */
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bufferIndex += gfx.bufferOffset;
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}
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/* increment pixel position */
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xpos += xoffset;
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ypos += yoffset;
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}
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}
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void gfx_start(unsigned int base)
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{
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/* make sure 2M mode is enabled */
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if (!(Pico_mcd->s68k_regs[3] & 0x04))
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{
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uint32 mask = 0;
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uint32 reg;
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/* trace vector pointer */
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gfx.tracePtr = (uint16 *)(Pico_mcd->word_ram2M + ((base << 2) & 0x3fff8));
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/* stamps & stamp map size */
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switch ((Pico_mcd->s68k_regs[0x58+1] >> 1) & 0x03)
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{
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case 0:
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gfx.dotMask = 0x07ffff; /* 256x256 dots/map */
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gfx.stampShift = 11 + 4; /* 16x16 dots/stamps */
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gfx.mapShift = 4; /* 16x16 stamps/map */
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mask = 0x3fe00; /* 512 bytes/table */
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break;
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case 1:
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gfx.dotMask = 0x07ffff; /* 256x256 dots/map */
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gfx.stampShift = 11 + 5; /* 32x32 dots/stamps */
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gfx.mapShift = 3; /* 8x8 stamps/map */
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mask = 0x3ff80; /* 128 bytes/table */
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break;
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case 2:
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gfx.dotMask = 0x7fffff; /* 4096*4096 dots/map */
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gfx.stampShift = 11 + 4; /* 16x16 dots/stamps */
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gfx.mapShift = 8; /* 256x256 stamps/map */
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mask = 0x20000; /* 131072 bytes/table */
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break;
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case 3:
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gfx.dotMask = 0x7fffff; /* 4096*4096 dots/map */
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gfx.stampShift = 11 + 5; /* 32x32 dots/stamps */
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gfx.mapShift = 7; /* 128x128 stamps/map */
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mask = 0x38000; /* 32768 bytes/table */
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break;
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}
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/* stamp map table base address */
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reg = (Pico_mcd->s68k_regs[0x5a] << 8) | Pico_mcd->s68k_regs[0x5b];
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gfx.mapPtr = (uint16 *)(Pico_mcd->word_ram2M + ((reg << 2) & mask));
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/* image buffer column offset (64 pixels/cell, minus 7 pixels to restart at cell beginning) */
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gfx.bufferOffset = (((Pico_mcd->s68k_regs[0x5c+1] & 0x1f) + 1) << 6) - 7;
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/* image buffer start index in dot units (2 pixels/byte) */
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reg = (Pico_mcd->s68k_regs[0x5e] << 8) | Pico_mcd->s68k_regs[0x5f];
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gfx.bufferStart = (reg << 3) & 0x7ffc0;
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/* add image buffer horizontal dot offset */
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gfx.bufferStart += (Pico_mcd->s68k_regs[0x60+1] & 0x3f);
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/* reset GFX chip cycle counter */
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//gfx.cycles = cycles;
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/* update GFX chip timings (see AC3:Thunderhawk / Thunderstrike) */
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//gfx.cyclesPerLine = 4 * 5 * scd.regs[0x62>>1].w;
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/* start graphics operation */
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Pico_mcd->s68k_regs[0x58] = 0x80;
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gfx_schedule();
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}
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}
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/* PicoDrive specific */
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#define UPDATE_CYCLES 20000
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static void gfx_schedule(void)
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{
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int w, h, cycles;
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int y_step;
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w = (Pico_mcd->s68k_regs[0x62] << 8) | Pico_mcd->s68k_regs[0x63];
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h = (Pico_mcd->s68k_regs[0x64] << 8) | Pico_mcd->s68k_regs[0x65];
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cycles = 5 * w * h;
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if (cycles > UPDATE_CYCLES)
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y_step = (UPDATE_CYCLES + 5 * w - 1) / (5 * w);
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else
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y_step = h;
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gfx.y_step = y_step;
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pcd_event_schedule_s68k(PCD_EVENT_GFX, 5 * w * y_step);
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}
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void gfx_update(unsigned int cycles)
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{
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int lines, lines_reg;
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int w;
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if (!(Pico_mcd->s68k_regs[0x58] & 0x80))
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return;
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w = (Pico_mcd->s68k_regs[0x62] << 8) | Pico_mcd->s68k_regs[0x63];
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lines = (Pico_mcd->s68k_regs[0x64] << 8) | Pico_mcd->s68k_regs[0x65];
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lines_reg = lines - gfx.y_step;
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if (lines_reg <= 0) {
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Pico_mcd->s68k_regs[0x58] = 0;
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Pico_mcd->s68k_regs[0x64] =
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Pico_mcd->s68k_regs[0x65] = 0;
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if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN1) {
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elprintf(EL_INTS|EL_CD, "s68k: gfx_cd irq 1");
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SekInterruptS68k(1);
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}
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}
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else {
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Pico_mcd->s68k_regs[0x64] = lines_reg >> 8;
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Pico_mcd->s68k_regs[0x65] = lines_reg;
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if (lines > gfx.y_step)
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lines = gfx.y_step;
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pcd_event_schedule(cycles, PCD_EVENT_GFX, 5 * w * lines);
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}
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if (PicoIn.opt & POPT_EN_MCD_GFX)
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{
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/* render lines */
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while (lines--)
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{
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/* process dots to image buffer */
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gfx_render(gfx.bufferStart, w);
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/* increment image buffer start index for next line (8 pixels/line) */
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gfx.bufferStart += 8;
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}
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}
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}
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// vim:shiftwidth=2:ts=2:expandtab
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