From e53f0499fe2337c5efea7443d6e2322887cae593 Mon Sep 17 00:00:00 2001 From: notaz Date: Sat, 21 Sep 2013 20:14:33 +0300 Subject: [PATCH] cd: pull in Genesis-Plus-GX CD gfx code license is the same, code quality is much better, so why not? Many thanks to Eke for writing it. --- pico/cd/genplus_types.h | 13 ++ pico/cd/gfx.c | 421 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 434 insertions(+) create mode 100644 pico/cd/genplus_types.h create mode 100644 pico/cd/gfx.c diff --git a/pico/cd/genplus_types.h b/pico/cd/genplus_types.h new file mode 100644 index 00000000..942aafbc --- /dev/null +++ b/pico/cd/genplus_types.h @@ -0,0 +1,13 @@ +#undef uint8 +#undef uint16 +#undef uint32 +#undef int8 +#undef int16 +#undef int32 + +#define uint8 unsigned char +#define uint16 unsigned short +#define uint32 unsigned int +#define int8 signed char +#define int16 signed short +#define int32 signed int diff --git a/pico/cd/gfx.c b/pico/cd/gfx.c new file mode 100644 index 00000000..00a5d49d --- /dev/null +++ b/pico/cd/gfx.c @@ -0,0 +1,421 @@ +/*************************************************************************************** + * 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. + * + ****************************************************************************************/ +#include "genplus_types.h" + +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 */ + 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; + +static gfx_t gfx; + +/***************************************************************/ +/* Rotation / Scaling operation (2M Mode) */ +/***************************************************************/ + +void gfx_init(void) +{ + int i, j; + uint16 offset; + uint8 mask, row, col, temp; + + memset(&gfx, 0, sizeof(gfx)); + + /* Initialize priority modes lookup table */ + for (i=0; i<0x100; i++) + { + for (j=0; j<0x100; j++) + { + /* normal */ + gfx.lut_prio[0][i][j] = j; + /* underwrite */ + gfx.lut_prio[1][i][j] = ((i & 0x0f) ? (i & 0x0f) : (j & 0x0f)) | ((i & 0xf0) ? (i & 0xf0) : (j & 0xf0)); + /* overwrite */ + gfx.lut_prio[2][i][j] = ((j & 0x0f) ? (j & 0x0f) : (i & 0x0f)) | ((j & 0xf0) ? (j & 0xf0) : (i & 0xf0)); + /* invalid */ + gfx.lut_prio[3][i][j] = i; + } + } + + /* Initialize cell lookup table */ + /* table entry = yyxxshrr (8 bits) */ + /* with: yy = cell row (0-3) */ + /* xx = cell column (0-3) */ + /* s = stamp size (0=16x16, 1=32x32) */ + /* hrr = HFLIP & ROTATION bits */ + for (i=0; i<0x100; i++) + { + /* one stamp = 2x2 cells (16x16) or 4x4 cells (32x32) */ + mask = (i & 8) ? 3 : 1; + row = (i >> 6) & mask; + col = (i >> 4) & mask; + + if (i & 4) { col = col ^ mask; } /* HFLIP (always first) */ + if (i & 2) { col = col ^ mask; row = row ^ mask; } /* ROLL1 */ + if (i & 1) { temp = col; col = row ^ mask; row = temp; } /* ROLL0 */ + + /* cell offset (0-3 or 0-15) */ + gfx.lut_cell[i] = row + col * (mask + 1); + } + + /* Initialize pixel lookup table */ + /* table entry = yyyxxxhrr (9 bits) */ + /* with: yyy = pixel row (0-7) */ + /* xxx = pixel column (0-7) */ + /* hrr = HFLIP & ROTATION bits */ + for (i=0; i<0x200; i++) + { + /* one cell = 8x8 pixels */ + row = (i >> 6) & 7; + col = (i >> 3) & 7; + + if (i & 4) { col = col ^ 7; } /* HFLIP (always first) */ + if (i & 2) { col = col ^ 7; row = row ^ 7; } /* ROLL1 */ + if (i & 1) { temp = col; col = row ^ 7; row = temp; } /* ROLL0 */ + + /* pixel offset (0-63) */ + gfx.lut_pixel[i] = col + row * 8; + } +} + +void gfx_reset(void) +{ + /* Reset cycle counter */ + gfx.cycles = 0; +} + +int gfx_context_save(uint8 *state) +{ + uint32 tmp32; + int bufferptr = 0; + + save_param(&gfx.cycles, sizeof(gfx.cycles)); + save_param(&gfx.cyclesPerLine, sizeof(gfx.cyclesPerLine)); + save_param(&gfx.dotMask, sizeof(gfx.dotMask)); + save_param(&gfx.stampShift, sizeof(gfx.stampShift)); + save_param(&gfx.mapShift, sizeof(gfx.mapShift)); + save_param(&gfx.bufferOffset, sizeof(gfx.bufferOffset)); + save_param(&gfx.bufferStart, sizeof(gfx.bufferStart)); + + tmp32 = (uint8 *)(gfx.tracePtr) - scd.word_ram_2M; + save_param(&tmp32, 4); + + tmp32 = (uint8 *)(gfx.mapPtr) - scd.word_ram_2M; + save_param(&tmp32, 4); + + return bufferptr; +} + +int gfx_context_load(uint8 *state) +{ + uint32 tmp32; + int bufferptr = 0; + + load_param(&gfx.cycles, sizeof(gfx.cycles)); + load_param(&gfx.cyclesPerLine, sizeof(gfx.cyclesPerLine)); + load_param(&gfx.dotMask, sizeof(gfx.dotMask)); + load_param(&gfx.stampShift, sizeof(gfx.stampShift)); + load_param(&gfx.mapShift, sizeof(gfx.mapShift)); + load_param(&gfx.bufferOffset, sizeof(gfx.bufferOffset)); + load_param(&gfx.bufferStart, sizeof(gfx.bufferStart)); + + load_param(&tmp32, 4); + gfx.tracePtr = (uint16 *)(scd.word_ram_2M + tmp32); + + load_param(&tmp32, 4); + gfx.mapPtr = (uint16 *)(scd.word_ram_2M + tmp32); + + return bufferptr; +} + +INLINE void gfx_render(uint32 bufferIndex, uint32 width) +{ + uint8 pixel_in, pixel_out; + uint16 stamp_data; + uint32 stamp_index; + + /* pixel map start position for current line (13.3 format converted to 13.11) */ + uint32 xpos = *gfx.tracePtr++ << 8; + uint32 ypos = *gfx.tracePtr++ << 8; + + /* pixel map offset values for current line (5.11 format) */ + uint32 xoffset = (int16) *gfx.tracePtr++; + uint32 yoffset = (int16) *gfx.tracePtr++; + + /* process all dots */ + while (width--) + { + /* check if stamp map is repeated */ + if (scd.regs[0x58>>1].byte.l & 0x01) + { + /* stamp map range */ + xpos &= gfx.dotMask; + ypos &= gfx.dotMask; + } + else + { + /* 24-bit range */ + xpos &= 0xffffff; + ypos &= 0xffffff; + } + + /* check if pixel is outside stamp map */ + if ((xpos | ypos) & ~gfx.dotMask) + { + /* force pixel output to 0 */ + pixel_out = 0x00; + } + else + { + /* read stamp map table data */ + stamp_data = gfx.mapPtr[(xpos >> gfx.stampShift) | ((ypos >> gfx.stampShift) << gfx.mapShift)]; + + /* stamp generator base index */ + /* sss ssssssss ccyyyxxx (16x16) or sss sssssscc ccyyyxxx (32x32) */ + /* with: s = stamp number (1 stamp = 16x16 or 32x32 pixels) */ + /* c = cell offset (0-3 for 16x16, 0-15 for 32x32) */ + /* yyy = line offset (0-7) */ + /* xxx = pixel offset (0-7) */ + stamp_index = (stamp_data & 0x7ff) << 8; + + if (stamp_index) + { + /* extract HFLIP & ROTATION bits */ + stamp_data = (stamp_data >> 13) & 7; + + /* cell offset (0-3 or 0-15) */ + /* table entry = yyxxshrr (8 bits) */ + /* with: yy = cell row (0-3) = (ypos >> (11 + 3)) & 3 */ + /* xx = cell column (0-3) = (xpos >> (11 + 3)) & 3 */ + /* s = stamp size (0=16x16, 1=32x32) */ + /* hrr = HFLIP & ROTATION bits */ + stamp_index |= gfx.lut_cell[stamp_data | ((scd.regs[0x58>>1].byte.l & 0x02) << 2 ) | ((ypos >> 8) & 0xc0) | ((xpos >> 10) & 0x30)] << 6; + + /* pixel offset (0-63) */ + /* table entry = yyyxxxhrr (9 bits) */ + /* with: yyy = pixel row (0-7) = (ypos >> 11) & 7 */ + /* xxx = pixel column (0-7) = (xpos >> 11) & 7 */ + /* hrr = HFLIP & ROTATION bits */ + stamp_index |= gfx.lut_pixel[stamp_data | ((xpos >> 8) & 0x38) | ((ypos >> 5) & 0x1c0)]; + + /* read pixel pair (2 pixels/byte) */ + pixel_out = READ_BYTE(scd.word_ram_2M, stamp_index >> 1); + + /* extract left or rigth pixel */ + if (stamp_index & 1) + { + pixel_out &= 0x0f; + } + else + { + pixel_out >>= 4; + } + } + else + { + /* stamp 0 is not used: force pixel output to 0 */ + pixel_out = 0x00; + } + } + + /* read out paired pixel data */ + pixel_in = READ_BYTE(scd.word_ram_2M, bufferIndex >> 1); + + /* update left or rigth pixel */ + if (bufferIndex & 1) + { + pixel_out |= (pixel_in & 0xf0); + } + else + { + pixel_out = (pixel_out << 4) | (pixel_in & 0x0f); + } + + /* priority mode write */ + pixel_out = gfx.lut_prio[(scd.regs[0x02>>1].w >> 3) & 0x03][pixel_in][pixel_out]; + + /* write data to image buffer */ + WRITE_BYTE(scd.word_ram_2M, bufferIndex >> 1, pixel_out); + + /* check current pixel position */ + if ((bufferIndex & 7) != 7) + { + /* next pixel */ + bufferIndex++; + } + else + { + /* next cell: increment image buffer offset by one column (minus 7 pixels) */ + bufferIndex += gfx.bufferOffset; + } + + /* increment pixel position */ + xpos += xoffset; + ypos += yoffset; + } +} + +void gfx_start(unsigned int base, int cycles) +{ + /* make sure 2M mode is enabled */ + if (!(scd.regs[0x02>>1].byte.l & 0x04)) + { + uint32 mask; + + /* trace vector pointer */ + gfx.tracePtr = (uint16 *)(scd.word_ram_2M + ((base << 2) & 0x3fff8)); + + /* stamps & stamp map size */ + switch ((scd.regs[0x58>>1].byte.l >> 1) & 0x03) + { + case 0: + gfx.dotMask = 0x07ffff; /* 256x256 dots/map */ + gfx.stampShift = 11 + 4; /* 16x16 dots/stamps */ + gfx.mapShift = 4; /* 16x16 stamps/map */ + mask = 0x3fe00; /* 512 bytes/table */ + break; + + case 1: + gfx.dotMask = 0x07ffff; /* 256x256 dots/map */ + gfx.stampShift = 11 + 5; /* 32x32 dots/stamps */ + gfx.mapShift = 3; /* 8x8 stamps/map */ + mask = 0x3ff80; /* 128 bytes/table */ + break; + + case 2: + gfx.dotMask = 0x7fffff; /* 4096*4096 dots/map */ + gfx.stampShift = 11 + 4; /* 16x16 dots/stamps */ + gfx.mapShift = 8; /* 256x256 stamps/map */ + mask = 0x20000; /* 131072 bytes/table */ + break; + + case 3: + gfx.dotMask = 0x7fffff; /* 4096*4096 dots/map */ + gfx.stampShift = 11 + 5; /* 32x32 dots/stamps */ + gfx.mapShift = 7; /* 128x128 stamps/map */ + mask = 0x38000; /* 32768 bytes/table */ + break; + } + + /* stamp map table base address */ + gfx.mapPtr = (uint16 *)(scd.word_ram_2M + ((scd.regs[0x5a>>1].w << 2) & mask)); + + /* image buffer column offset (64 pixels/cell, minus 7 pixels to restart at cell beginning) */ + gfx.bufferOffset = (((scd.regs[0x5c>>1].byte.l & 0x1f) + 1) << 6) - 7; + + /* image buffer start index in dot units (2 pixels/byte) */ + gfx.bufferStart = (scd.regs[0x5e>>1].w << 3) & 0x7ffc0; + + /* add image buffer horizontal dot offset */ + gfx.bufferStart += (scd.regs[0x60>>1].byte.l & 0x3f); + + /* reset GFX chip cycle counter */ + gfx.cycles = cycles; + + /* update GFX chip timings (see AC3:Thunderhawk / Thunderstrike) */ + gfx.cyclesPerLine = 4 * 5 * scd.regs[0x62>>1].w; + + /* start graphics operation */ + scd.regs[0x58>>1].byte.h = 0x80; + } +} + +void gfx_update(int cycles) +{ + /* synchronize GFX chip with SUB-CPU */ + cycles -= gfx.cycles; + + /* make sure SUB-CPU is ahead */ + if (cycles > 0) + { + /* number of lines to process */ + unsigned int lines = (cycles + gfx.cyclesPerLine - 1) / gfx.cyclesPerLine; + + /* check against remaining lines */ + if (lines < scd.regs[0x64>>1].byte.l) + { + /* update Vdot remaining size */ + scd.regs[0x64>>1].byte.l -= lines; + + /* increment cycle counter */ + gfx.cycles += lines * gfx.cyclesPerLine; + } + else + { + /* process remaining lines */ + lines = scd.regs[0x64>>1].byte.l; + + /* clear Vdot remaining size */ + scd.regs[0x64>>1].byte.l = 0; + + /* end of graphics operation */ + scd.regs[0x58>>1].byte.h = 0; + + /* level 1 interrupt enabled ? */ + if (scd.regs[0x32>>1].byte.l & 0x02) + { + /* trigger level 1 interrupt */ + scd.pending |= (1 << 1); + + /* update IRQ level */ + s68k_update_irq((scd.pending & scd.regs[0x32>>1].byte.l) >> 1); + } + } + + /* render lines */ + while (lines--) + { + /* process dots to image buffer */ + gfx_render(gfx.bufferStart, scd.regs[0x62>>1].w); + + /* increment image buffer start index for next line (8 pixels/line) */ + gfx.bufferStart += 8; + } + } +} -- 2.39.5