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SGB and AGB color correction

This commit is contained in:
Lior Halphon 2019-09-13 17:13:21 +03:00
parent 4fcc921b46
commit 851dbd3ccd
2 changed files with 37 additions and 25 deletions
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41
Core/display.c
View File

@ -162,9 +162,20 @@ static inline uint8_t scale_channel(uint8_t x)
static inline uint8_t scale_channel_with_curve(uint8_t x)
{
return (uint8_t[]){0,2,4,7,12,18,25,34,42,52,62,73,85,97,109,121,134,146,158,170,182,193,203,213,221,230,237,243,248,251,253,255,}[x];
return (uint8_t[]){0,2,4,7,12,18,25,34,42,52,62,73,85,97,109,121,134,146,158,170,182,193,203,213,221,230,237,243,248,251,253,255}[x];
}
static inline uint8_t scale_channel_with_curve_agb(uint8_t x)
{
return (uint8_t[]){0,2,5,10,15,20,26,32,38,45,52,60,68,76,84,92,101,110,119,128,138,148,158,168,178,189,199,210,221,232,244,255}[x];
}
static inline uint8_t scale_channel_with_curve_sgb(uint8_t x)
{
return (uint8_t[]){0,2,5,9,15,20,27,34,42,50,58,67,76,85,94,104,114,123,133,143,153,163,173,182,192,202,211,220,229,238,247,255}[x];
}
uint32_t GB_convert_rgb15(GB_gameboy_t *gb, uint16_t color)
{
uint8_t r = (color) & 0x1F;
@ -177,13 +188,29 @@ uint32_t GB_convert_rgb15(GB_gameboy_t *gb, uint16_t color)
b = scale_channel(b);
}
else {
r = scale_channel_with_curve(r);
g = scale_channel_with_curve(g);
b = scale_channel_with_curve(b);
if (GB_is_sgb(gb)) {
return gb->rgb_encode_callback(gb,
scale_channel_with_curve_sgb(r),
scale_channel_with_curve_sgb(g),
scale_channel_with_curve_sgb(b));
}
bool agb = gb->model == GB_MODEL_AGB;
r = agb? scale_channel_with_curve_agb(r) : scale_channel_with_curve(r);
g = agb? scale_channel_with_curve_agb(g) : scale_channel_with_curve(g);
b = agb? scale_channel_with_curve_agb(b) : scale_channel_with_curve(b);
if (gb->color_correction_mode != GB_COLOR_CORRECTION_CORRECT_CURVES) {
uint8_t new_g = (g * 3 + b) / 4;
uint8_t new_r = r, new_b = b;
uint8_t new_r, new_g, new_b;
if (agb) {
new_r = (r * 7 + g * 1) / 8;
new_g = (g * 3 + b * 1) / 4;
new_b = (b * 7 + r * 1) / 8;
}
else {
new_g = (g * 3 + b) / 4;
new_r = r;
new_b = b;
}
if (gb->color_correction_mode == GB_COLOR_CORRECTION_PRESERVE_BRIGHTNESS) {
uint8_t old_max = MAX(r, MAX(g, b));
uint8_t new_max = MAX(new_r, MAX(new_g, new_b));
@ -200,7 +227,7 @@ uint32_t GB_convert_rgb15(GB_gameboy_t *gb, uint16_t color)
if (new_min != 0xff) {
new_r = 0xff - (0xff - new_r) * (0xff - old_min) / (0xff - new_min);
new_g = 0xff - (0xff - new_g) * (0xff - old_min) / (0xff - new_min);
new_b = 0xff - (0xff - new_b) * (0xff - old_min) / (0xff - new_min);;
new_b = 0xff - (0xff - new_b) * (0xff - old_min) / (0xff - new_min);
}
}
r = new_r;

21
Core/sgb.c
View File

@ -465,22 +465,9 @@ void GB_sgb_write(GB_gameboy_t *gb, uint8_t value)
}
}
static inline uint8_t scale_channel(uint8_t x)
{
return (x << 3) | (x >> 2);
}
static uint32_t convert_rgb15(GB_gameboy_t *gb, uint16_t color)
{
uint8_t r = (color) & 0x1F;
uint8_t g = (color >> 5) & 0x1F;
uint8_t b = (color >> 10) & 0x1F;
r = scale_channel(r);
g = scale_channel(g);
b = scale_channel(b);
return gb->rgb_encode_callback(gb, r, g, b);
return GB_convert_rgb15(gb, color);
}
static uint32_t convert_rgb15_with_fade(GB_gameboy_t *gb, uint16_t color, uint8_t fade)
@ -493,11 +480,9 @@ static uint32_t convert_rgb15_with_fade(GB_gameboy_t *gb, uint16_t color, uint8_
if (g >= 0x20) g = 0;
if (b >= 0x20) b = 0;
r = scale_channel(r);
g = scale_channel(g);
b = scale_channel(b);
color = r | (g << 5) | (b << 10);
return gb->rgb_encode_callback(gb, r, g, b);
return GB_convert_rgb15(gb, color);
}
#include <stdio.h>