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Dither using a pattern, closer to actual GameBoy Camera

This commit is contained in:
Lior Halphon 2016-10-02 23:36:20 +03:00
parent de7c15fc68
commit 479a64dca6
1 changed files with 2 additions and 19 deletions
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21
Core/camera.c
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@ -1,22 +1,5 @@
#include "camera.h"
static int8_t dither_random(uint8_t x, uint8_t y)
{
static bool once = false;
static int8_t random[128*112];
if (!once) {
unsigned int r = 0x1337c0de;
for (int i = 0; i < sizeof(random); i++) {
random[i] = r % 85 - 42;
r += 11;
r *= 25214903917;
}
once = true;
}
return random[x + y * 128];
}
uint8_t GB_camera_read_image(GB_gameboy_t *gb, uint16_t addr)
{
uint8_t tile_x = addr / 0x10 % 0x10;
@ -31,8 +14,8 @@ uint8_t GB_camera_read_image(GB_gameboy_t *gb, uint16_t addr)
int color = gb->camera_get_pixel_callback? gb->camera_get_pixel_callback(gb, x,y) ^ 0xFF : (rand() & 0xFF);
/* Dither using a deterministic random */
color += dither_random(x, y);
/* Dither using a pattern */
color += ((x + y) & 1? 21 : -21) >> (y & 1);
if (color > 255) {
color = 255;
}