271 lines
7.6 KiB
C++
271 lines
7.6 KiB
C++
/******************************************************************************/
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/* Mednafen NEC PC-FX Emulation Module */
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/******************************************************************************/
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/* king-bgfast.inc:
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** Copyright (C) 2006-2016 Mednafen Team
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of the GNU General Public License
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** as published by the Free Software Foundation; either version 2
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** of the License, or (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 Foundation, Inc.,
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** 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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// Loop prefix non-endless
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#define DRAWBG8x1_LPRE() if(bat_x < bat_width) {
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// Loop postfix non-endless
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#define DRAWBG8x1_LPOST() } bat_x = (bat_x + 1) & bat_width_mask;
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#define CDBG_REASON(format, ...)
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//printf("BG%d Reason: " format "\n", n, ## __VA_ARGS__);
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static bool CanDrawBG_Fast(int n)
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{
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static const int cg_per_mode[0x8] =
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{
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0, // Invalid mode
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1, // 2-bit mode
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2, // 4-bit mode
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4, // 8-bit mode
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8, // 16-bit mode
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8, // 16-bit mode
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8, // 16-bit mode
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8, // 16-bit mode
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};
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const unsigned int bgmode = (king->bgmode >> (n * 4)) & 0xF;
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const uint32 bat_offset = king->BGBATAddr[n] * 1024;
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const uint32 cg_offset = king->BGCGAddr[n] * 1024;
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const uint32 bg_width = (king->BGSize[n] & 0xF0) >> 4;
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const uint32 bg_height = king->BGSize[n] & 0x0F;
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// If the bgmode is 0, or 6/7(EXT DOT modes), abort.
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if(!(bgmode & 0x7) || ((bgmode & 0x7) >= 6))
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{
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CDBG_REASON("Mode %02x out of range", bgmode);
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return(FALSE);
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}
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// BG width out of range?
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if(bg_width < 0x3 || bg_width > 0xA)
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{
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CDBG_REASON("Width %02x out of range", bg_width);
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return(FALSE);
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}
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// BG height out of range?
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if(bg_height < 0x3 || bg_height > 0xA)
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{
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CDBG_REASON("Height %02x out of range", bg_height);
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return(FALSE);
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}
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// Time for very stringent checks for BG0! Don't draw if the sub-screen is a different size than the main screen,
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// or the subscreen CG base != the main screen CG base, or the subscreen BAT base != main screen BAT base(when bgmode & 0x8 is TRUE)
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if(!n)
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{
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if(king->priority & 0x1000)
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{
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CDBG_REASON("Affine transform enabled");
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return(FALSE);
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}
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if((king->BGSize[0] & 0xFF) != (king->BGSize[0] >> 8))
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{
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CDBG_REASON("Main Screen/Sub Screen Size Mismatch");
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return(FALSE);
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}
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// Since we already made sure the main screen/sub screen sizes match, we only
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// care if BG base or CG base don't match if endless/repeat scrolling is enabled.
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// Otherwise, the subscreen won't show at all.
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if(king->BGScrollMode & 0x1)
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{
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if(king->BGCGAddr[0] != king->BG0SubCGAddr)
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{
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CDBG_REASON("Main Screen/Sub Screen CG base mismatch");
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return(FALSE);
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}
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if(bgmode & 0x8)
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{
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if(king->BGBATAddr[0] != king->BG0SubBATAddr)
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{
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CDBG_REASON("Main Screen/Sub Screen BAT base mismatch");
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return(FALSE);
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}
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}
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}
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}
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// If microprogram fetching is disabled, abort.
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if(!(king->MPROGControl & 0x1))
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{
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CDBG_REASON("Microprogram disabled");
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return(FALSE);
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}
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else
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{
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int remap_thing = 0;
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bool bat_fetch = FALSE;
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for(int x = 0; x < 16; x++)
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{
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uint16 mpd;
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// Forcing CG and BAT to 0 if the affine bit != rotate_mode is not technically correct.
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// If there is a mismatch, it's more likely the effective CG and BAT address for the pixel/segment
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// being drawn won't be calculated correctly, likely being just the initial offsets.
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mpd = king->MPROGData[x];
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// Fetching for this BG number?
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if(((mpd >> 6) & 0x3) != n)
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continue;
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// NOP
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if(mpd & 0x100)
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continue;
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// Affine bit.
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if(mpd & 0x20)
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{
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CDBG_REASON("Affine bit set");
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return(FALSE);
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}
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// BAT fetch
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if(mpd & 0x10)
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{
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if(((bat_offset & 0x20000) >> 14) != (x & 8))
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{
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CDBG_REASON("BAT MPROG/base bank mismatch");
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return(FALSE);
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}
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bat_fetch = TRUE;
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}
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else // CG fetch:
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{
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// CG offset/bank mismatch...
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if(((cg_offset & 0x20000) >> 14) != (x & 8))
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{
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CDBG_REASON("CG MPROG/base bank mismatch");
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return(FALSE);
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}
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// Mismatch between CG fetch type and BG mode!
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if((mpd & 0x8) != (bgmode & 0x8))
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{
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CDBG_REASON("Mismatch between CG fetch type and bg mode");
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return(FALSE);
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}
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// Skewed CG fetch order
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if((mpd & 0x7) != remap_thing)
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{
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CDBG_REASON("Skewed CG fetch order");
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return(FALSE);
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}
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remap_thing++;
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}
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}
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// CG fetch count mismatch
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if(remap_thing != cg_per_mode[bgmode & 0x7])
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{
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CDBG_REASON("CG fetch count mismatch");
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return(FALSE);
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}
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// BG mode demands a BAT fetch, but we don't have one!
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if((bgmode & 0x8) && !bat_fetch)
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{
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CDBG_REASON("Missing BAT fetch");
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return(FALSE);
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}
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}
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return(TRUE);
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}
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static void DrawBG_Fast(uint32 *target, int n)
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{
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const uint16 bgmode = (king->bgmode >> (n * 4)) & 0xF;
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const bool endless = (king->BGScrollMode >> n) & 0x1;
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const uint32 XScroll = sign_x_to_s32((n ? 10 : 11), king->BGXScroll[n]);
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const uint32 YScroll = sign_x_to_s32((n ? 10 : 11), king->BGYScroll[n]);
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const uint32 bat_offset = king->BGBATAddr[n] * 1024;
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const uint32 cg_offset = king->BGCGAddr[n] * 1024;
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const uint32 bat_and_cg_page = (king->PageSetting & 0x0010) ? 1 : 0;
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const uint32 YOffset = (YScroll + (fx_vce.raster_counter - 22)) & 0xFFFF;
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const uint32 layer_or = (LAYER_BG0 + n) << 28;
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const int ysmall = YOffset & 0x7;
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const unsigned int bat_width_shift = (king->BGSize[n] & 0xF0) >> 4;
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const unsigned int bat_width = (1 << bat_width_shift) >> 3;
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const unsigned int bat_width_mask = endless ? (bat_width - 1) : ((((1 << 0xA) * 2) / 8) - 1);
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const int bat_height_shift = king->BGSize[n] & 0x0F;
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const int bat_height = (1 << bat_height_shift) >> 3;
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const int bat_height_mask = endless ? (bat_height - 1) : ((((1 << 0xA) * 2) / 8) - 1);
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// We don't need to &= cg_offset and bat_offset with 0x1ffff after here, as the effective addresses
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// calculated with them are anded with 0x1ffff in the rendering code already.
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const uint16 * const king_cg_base = &king->KRAM[bat_and_cg_page][cg_offset & 0x20000];
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const uint16 * const king_bat_base = &king->KRAM[bat_and_cg_page][bat_offset & 0x20000];
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int bat_y = (YOffset >> 3) & bat_height_mask;
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uint32 bat_x = (XScroll >> 3) & bat_width_mask;
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target += 8 - (XScroll & 0x7);
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// If we're in non-endless scroll mode, and we've scrolled past our visible area in the vertical direction, so return.
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if(!endless && bat_y >= bat_height) // Draw this line as transparency and return?
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{
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return;
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}
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// Adjust/corrupt bat_y to be faster in our blitting code
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bat_y = (bat_y << bat_width_shift) >> 3;
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const uint32 palette_offset = ((vce_rendercache.palette_offset[1 + (n >> 1)] >> ((n & 1) ? 8 : 0)) << 1) & 0x1FF;
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const uint32 * const palette_ptr = &vce_rendercache.palette_table_cache[palette_offset];
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{
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int wmul = (1 << bat_width_shift), wmask = (1 << bat_height_shift) - 1;
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int sexy_y_pos = (YOffset & wmask) * wmul;
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#if 0
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#define BGFAST_BATMODE (bgmode & 0x8)
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#include "king-bgfast-blit.inc"
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#else
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if(bgmode & 0x8)
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{
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#define BGFAST_BATMODE 1
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#include "king-bgfast-blit.inc"
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#undef BGFAST_BATMODE
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}
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else
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{
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#define BGFAST_BATMODE 0
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#include "king-bgfast-blit.inc"
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#undef BGFAST_BATMODE
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}
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#endif
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}
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}
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