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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
[Decompilation] [th01] Pellets: Reset and decay functions Or, in more relevant news: That's the function that forced TH01's pellet sprites to be defined in C land. First sprite to make that jump. Part of P0102, funded by Yanga.
2020-07-06 19:43:55 +00:00
extern const dots16_t sPELLET[PELLET_CELS][PRESHIFT][PELLET_H];
[Maintenance] Declare distinct types for screen, VRAM, and TRAM coordinates Whew, time to look at every `int` variable we ever declared! The best moment to do this would have been a year ago, but well, better late than never. No need to communicate that in comments anymore. These shouldn't be used for widths, heights, or sprite-space coordinates. Maybe we'll cover that another time, this commit is already large enough. Part of P0111, funded by [Anonymous] and Blue Bolt.
2020-08-20 19:59:45 +00:00
void pascal near pellet_render(screen_x_t left, vram_y_t top)
[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
{
_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;
[Maintenance] #define the number of dots in a byte One fewer magic number. And one more deliberate dependency on a PC-98-specific hardware constant, to further drive home just how unportable these games are, even once decompilation will be complete. Part of P0105, funded by Yanga.
2020-08-05 21:04:47 +00:00
_SI = reinterpret_cast<uint16_t>(sPELLET[0][left & (BYTE_DOTS - 1)]);
[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] Consistently use { brackets } for inline assembly Part of P0183, funded by Yanga and [Anonymous].
2022-02-13 04:15:27 +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] Consistently use { brackets } for inline assembly Part of P0183, funded by Yanga and [Anonymous].
2022-02-13 04:15:27 +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
}