192 lines
5.1 KiB
C
192 lines
5.1 KiB
C
/* Copyright (c) 2010, shalma.
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* Portions Copyright (c) 2002, Pete Bernert.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "psxhw.h"
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#include "gpu.h"
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#include "psxdma.h"
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#include "pgxp_mem.h"
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#define GPUSTATUS_ODDLINES 0x80000000
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#define GPUSTATUS_DMABITS 0x60000000 // Two bits
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#define GPUSTATUS_READYFORCOMMANDS 0x10000000 // DMA block ready
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#define GPUSTATUS_READYFORVRAM 0x08000000
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#define GPUSTATUS_IDLE 0x04000000 // CMD ready
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#define GPUSTATUS_MODE 0x02000000 // Data request mode
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#define GPUSTATUS_DISPLAYDISABLED 0x00800000
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#define GPUSTATUS_INTERLACED 0x00400000
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#define GPUSTATUS_RGB24 0x00200000
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#define GPUSTATUS_PAL 0x00100000
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#define GPUSTATUS_DOUBLEHEIGHT 0x00080000
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#define GPUSTATUS_WIDTHBITS 0x00070000 // Three bits
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#define GPUSTATUS_MASKENABLED 0x00001000
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#define GPUSTATUS_MASKDRAWN 0x00000800
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#define GPUSTATUS_DRAWINGALLOWED 0x00000400
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#define GPUSTATUS_DITHER 0x00000200
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// Taken from PEOPS SOFTGPU
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u32 lUsedAddr[3];
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static inline boolean CheckForEndlessLoop(u32 laddr) {
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if (laddr == lUsedAddr[1]) return TRUE;
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if (laddr == lUsedAddr[2]) return TRUE;
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if (laddr < lUsedAddr[0]) lUsedAddr[1] = laddr;
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else lUsedAddr[2] = laddr;
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lUsedAddr[0] = laddr;
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return FALSE;
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}
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static u32 gpuDmaChainSize(u32 addr) {
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u32 size;
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u32 DMACommandCounter = 0;
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lUsedAddr[0] = lUsedAddr[1] = lUsedAddr[2] = 0xffffff;
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// initial linked list ptr (word)
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size = 1;
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do {
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addr &= 0x1ffffc;
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if (DMACommandCounter++ > 2000000) break;
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if (CheckForEndlessLoop(addr)) break;
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// # 32-bit blocks to transfer
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size += psxMu8( addr + 3 );
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// next 32-bit pointer
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addr = psxMu32( addr & ~0x3 ) & 0xffffff;
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size += 1;
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} while (addr != 0xffffff);
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return size;
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}
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int gpuReadStatus() {
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int hard;
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// GPU plugin
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hard = GPU_readStatus();
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// Gameshark Lite - wants to see VRAM busy
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// - Must enable GPU 'Fake Busy States' hack
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if( (hard & GPUSTATUS_IDLE) == 0 )
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hard &= ~GPUSTATUS_READYFORVRAM;
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return hard;
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}
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void psxDma2(u32 madr, u32 bcr, u32 chcr) { // GPU
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u32 *ptr;
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u32 size, bs;
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switch (chcr) {
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case 0x01000200: // vram2mem
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#ifdef PSXDMA_LOG
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PSXDMA_LOG("*** DMA2 GPU - vram2mem *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
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#endif
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ptr = (u32 *)PSXM(madr);
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if (ptr == NULL) {
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#ifdef PSXDMA_LOG
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PSXDMA_LOG("*** DMA2 GPU - vram2mem *** NULL Pointer!!!\n");
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#endif
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break;
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}
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// BA blocks * BS words (word = 32-bits)
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size = (bcr >> 16) * (bcr & 0xffff);
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GPU_readDataMem(ptr, size);
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#ifdef PSXREC
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psxCpu->Clear(madr, size);
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#endif
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#if 1
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// already 32-bit word size ((size * 4) / 4)
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GPUDMA_INT(size);
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#else
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// Experimental burst dma transfer (0.333x max)
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GPUDMA_INT(size/3);
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#endif
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return;
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case 0x01000201: // mem2vram
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bs=(bcr & 0xffff);
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size = (bcr >> 16) * bs; // BA blocks * BS words (word = 32-bits)
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#ifdef PSXDMA_LOG
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PSXDMA_LOG("*** DMA 2 - GPU mem2vram *** %lx addr = %lxh, BCR %lxh => size %d = BA(%d) * BS(%xh)\n",
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chcr, madr, bcr, size, size / bs, size / (bcr >> 16));
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#endif
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ptr = (u32 *)PSXM(madr);
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if (ptr == NULL) {
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#ifdef PSXDMA_LOG
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PSXDMA_LOG("*** DMA2 GPU - mem2vram *** NULL Pointer!!!\n");
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#endif
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break;
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}
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GPU_pgxpMemory(PGXP_ConvertAddress(madr), PGXP_GetMem());
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GPU_writeDataMem(ptr, size);
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#if 0
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// already 32-bit word size ((size * 4) / 4)
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GPUDMA_INT(size);
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#else
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// X-Files video interlace. Experimental delay depending of BS.
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GPUDMA_INT( (7 * size) / bs );
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#endif
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return;
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case 0x00000401: // Vampire Hunter D: title screen linked list update (see psxhw.c)
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case 0x01000401: // dma chain
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#ifdef PSXDMA_LOG
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PSXDMA_LOG("*** DMA 2 - GPU dma chain *** %8.8lx addr = %lx size = %lx\n", chcr, madr, bcr);
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#endif
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size = gpuDmaChainSize(madr);
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GPU_dmaChain((u32 *)psxM, madr & 0x1fffff);
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// Tekken 3 = use 1.0 only (not 1.5x)
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// Einhander = parse linked list in pieces (todo)
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// Final Fantasy 4 = internal vram time (todo)
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// Rebel Assault 2 = parse linked list in pieces (todo)
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// Vampire Hunter D = allow edits to linked list (todo)
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GPUDMA_INT(size);
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return;
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#ifdef PSXDMA_LOG
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default:
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PSXDMA_LOG("*** DMA 2 - GPU unknown *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
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break;
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#endif
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}
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HW_DMA2_CHCR &= SWAP32(~0x01000000);
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DMA_INTERRUPT(2);
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}
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void gpuInterrupt() {
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HW_DMA2_CHCR &= SWAP32(~0x01000000);
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DMA_INTERRUPT(2);
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}
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