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ReC98/th02/main/bullet/pellet_r.cpp

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[Maintenance] Move the pellet sprite to TH01 That's where it actually originated. Part of P0096, funded by Ember2528.
2020-06-05 12:24:03 +00:00
#include "th01/sprites/pellet.h"
[Reverse-engineering] [th02/th04/th05] Pellet rendering … which allows a split into first rendering the top part of every pellet, then the bottom part. This way, the game only needs two grcg_setcolor() calls for any number of pellets. Part of P0085, funded by -Tom-.
2020-03-27 21:12:18 +00:00
void pascal near pellet_render(int left, int top)
{
_ES = SEG_PLANE_B;
_BX = _BX; // Keeps any parameters from being put into BX
_AX = (left >> 3);
_DX = top;
_DX <<= 6;
_AX += _DX;
_DX >>= 2;
_DI = _AX + _DX;
[Decompilation] [th01] Pellet rendering So even TH01 wasn't 100% C++ after all. Turns out that this function was the only instance in all of REIIDEN.EXE where ReC98 previously had different encodings for identical x86 instructions. Part of P0096, funded by Ember2528.
2020-06-05 15:19:44 +00:00
_SI = reinterpret_cast<uint16_t>(sPELLET[0][left & 7]);
[Reverse-engineering] [th02/th04/th05] Pellet rendering … which allows a split into first rendering the top part of every pellet, then the bottom part. This way, the game only needs two grcg_setcolor() calls for any number of pellets. Part of P0085, funded by -Tom-.
2020-03-27 21:12:18 +00:00
_CX = 8;
put_loop: {
[Maintenance] Decide on __asm as the keyword for inline assembly Which works in both Borland C++, Open Watcom, and Visual C++. Not that we're about to port any of the games to these compilers, just something I noticed while evaluating 32-bit compilers for ReC98's own 32-bit pipeline tools. Modders might want to look into that though, since 100% position independence also makes it easier to change compilers.
2020-06-19 15:50:05 +00:00
__asm movsw
[Reverse-engineering] [th02/th04/th05] Pellet rendering … which allows a split into first rendering the top part of every pellet, then the bottom part. This way, the game only needs two grcg_setcolor() calls for any number of pellets. Part of P0085, funded by -Tom-.
2020-03-27 21:12:18 +00:00
_DI += (ROW_SIZE - sizeof(dots16_t));
if(static_cast<int16_t>(_DI) >= PLANE_SIZE) {
_DI -= PLANE_SIZE;
}
}
[Maintenance] Decide on __asm as the keyword for inline assembly Which works in both Borland C++, Open Watcom, and Visual C++. Not that we're about to port any of the games to these compilers, just something I noticed while evaluating 32-bit compilers for ReC98's own 32-bit pipeline tools. Modders might want to look into that though, since 100% position independence also makes it easier to change compilers.
2020-06-19 15:50:05 +00:00
__asm loop put_loop;
[Reverse-engineering] [th02/th04/th05] Pellet rendering … which allows a split into first rendering the top part of every pellet, then the bottom part. This way, the game only needs two grcg_setcolor() calls for any number of pellets. Part of P0085, funded by -Tom-.
2020-03-27 21:12:18 +00:00
}