Leahnaya/Poke_Transporter_GB
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Prepare for trouble... and make it.... fixed point?

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To protect the world from the soft float library...
To unite all arithmetic within our binary...
To denounce the evils of floating point precision...
To save more kilobytes - that's our vision....

(god this is cringe)

All floating point math has been eliminated, and replaced with
equivalent or near-equivalent fixed-point math.

sprite_data.cpp uses Q16, and get_rand_range uses a full Q32 to
ensure that the exact same results are generated as before, at
the cost of some inline assembly to do a umull (__aeabi_lmul is a
little excessive when the lower 32 bits are discarded)

This eliminates all of the expensive double precision float library,
saving a few kilobytes.

Additionally, the unneccessary parts of nanoprintf have been
disabled. There is no need for precision specifiers, long longs, or
floats.
This commit is contained in:
easyaspi314
2025-06-30 13:05:32 -04:00
parent 16345eff59
commit 750641c78f
4 changed files with 29 additions and 11 deletions
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19
source/sprite_data.cpp
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@@ -13,6 +13,7 @@ int y_offset = 0;
int y_offset_timer = 0;
int y_offset_direction = 1;
// BACKGROUNDS
#define QF(x) ((unsigned)(x * 65536.0f))
#include "background.h"
void load_background()
@@ -79,10 +80,12 @@ void set_background_pal(int curr_rom_id, bool dark, bool fade)
}
if (fade)
{
#define NUM_CYCLES 30.0
#define NUM_CYCLES 30
COLOR curr_pal_bg[8];
COLOR old_pal[3];
COLOR new_pal[3];
unsigned INV_NUM_CYCLES = QF(1.0 / NUM_CYCLES);
tonccpy(curr_pal_bg, &pal_bg_mem[0], 16);
for (int n = 0; n <= NUM_CYCLES; n++)
{
@@ -94,9 +97,9 @@ void set_background_pal(int curr_rom_id, bool dark, bool fade)
new_pal[b] = (new_pal_bg[i] >> (b * 5)) & 0b11111;
}
pal_bg_mem[i] = RGB15(
(((NUM_CYCLES - n) / NUM_CYCLES) * old_pal[0]) + ((n / NUM_CYCLES) * new_pal[0]),
(((NUM_CYCLES - n) / NUM_CYCLES) * old_pal[1]) + ((n / NUM_CYCLES) * new_pal[1]),
(((NUM_CYCLES - n) / NUM_CYCLES) * old_pal[2]) + ((n / NUM_CYCLES) * new_pal[2]));
((((NUM_CYCLES - n) * INV_NUM_CYCLES) * old_pal[0]) + ((n * INV_NUM_CYCLES) * new_pal[0])) >> 16,
((((NUM_CYCLES - n) * INV_NUM_CYCLES) * old_pal[1]) + ((n * INV_NUM_CYCLES) * new_pal[1])) >> 16,
((((NUM_CYCLES - n) * INV_NUM_CYCLES) * old_pal[2]) + ((n * INV_NUM_CYCLES) * new_pal[2])) >> 16);
}
global_next_frame();
}
@@ -879,10 +882,10 @@ void update_front_box_sprite(Simplified_Pokemon *curr_pkmn)
LZ77UnCompWram((const unsigned short *)palette_location, buffer); // This is a little silly, but it's being weird with bytes vs shorts when we copy it directly
for (int i = 0; i < 16; i++)
{
double red = (buffer[i] >> 0) & 0b11111;
double green = (buffer[i] >> 5) & 0b11111;
double blue = (buffer[i] >> 10) & 0b11111;
int grey = (0.299 * red) + (0.587 * green) + (0.114 * blue);
unsigned red = (buffer[i] >> 0) & 0b11111;
unsigned green = (buffer[i] >> 5) & 0b11111;
unsigned blue = (buffer[i] >> 10) & 0b11111;
unsigned grey = ((QF(0.299f) * red) + (QF(0.587f) * green) + (QF(0.114f) * blue)) >> 16;
// buffer[i] = RGB15_SAFE(red, ((int)green >> 1), 0);
buffer[i] = RGB15_SAFE(grey, (grey >> 1), 0);