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repeat gamma entries to handle B2 thousands (16-bit) color mode; ignore its solid grey palettes such as those that happen during mode changes

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This commit is contained in:
rakslice 2020-08-18 04:21:23 -07:00
parent b4b652d696
commit bb080a262e
2 changed files with 39 additions and 10 deletions
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25
BasiliskII/src/SDL/video_sdl.cpp
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@ -1370,19 +1370,34 @@ void SDL_monitor_desc::set_palette(uint8 *pal, int num_in)
if ((int)VIDEO_MODE_DEPTH > VIDEO_DEPTH_8BIT) {
// handle the gamma ramp
if (pal[0] == 127 && pal[num_in*3-1] == 127) // solid grey
return; // ignore
uint16 red[256];
uint16 green[256];
uint16 blue[256];
for (int i = 0; i < 256; i++) {
red[i] = pal[i*3 + 0] << 8;
green[i] = pal[i*3 + 1] << 8;
blue[i] = pal[i*3 + 2] << 8;
int repeats = 256 / num_in;
for (int i = 0; i < num_in; i++) {
for (int j = 0; j < repeats; j++) {
red[i*repeats + j] = pal[i*3 + 0] << 8;
green[i*repeats + j] = pal[i*3 + 1] << 8;
blue[i*repeats + j] = pal[i*3 + 2] << 8;
}
}
// fill remaining entries (if any) with last value
for (int i = num_in * repeats; i < 256; i++) {
red[i] = pal[(num_in - 1) * 3] << 8;
green[i] = pal[(num_in - 1) * 3 + 1] << 8;
blue[i] = pal[(num_in - 1) * 3 + 2] << 8;
}
bool changed = (memcmp(red, last_gamma_red, 512) != 0 ||
memcmp(green, last_gamma_green, 512) != 0 ||
memcmp(blue, last_gamma_blue, 512) != 0);
memcmp(blue, last_gamma_blue, 512) != 0);
if (changed) {
int result = SDL_SetGammaRamp(red, green, blue);

24
BasiliskII/src/SDL/video_sdl2.cpp
View File

@ -1746,20 +1746,34 @@ void SDL_monitor_desc::set_palette(uint8 *pal, int num_in)
if ((int)VIDEO_MODE_DEPTH > VIDEO_DEPTH_8BIT) {
// handle the gamma ramp
if (pal[0] == 127 && pal[num_in*3-1] == 127) // solid grey
return; // ignore
uint16 red[256];
uint16 green[256];
uint16 blue[256];
for (int i = 0; i < 256; i++) {
red[i] = pal[i*3 + 0] << 8;
green[i] = pal[i*3 + 1] << 8;
blue[i] = pal[i*3 + 2] << 8;
int repeats = 256 / num_in;
for (int i = 0; i < num_in; i++) {
for (int j = 0; j < repeats; j++) {
red[i*repeats + j] = pal[i*3 + 0] << 8;
green[i*repeats + j] = pal[i*3 + 1] << 8;
blue[i*repeats + j] = pal[i*3 + 2] << 8;
}
}
// fill remaining entries (if any) with last value
for (int i = num_in * repeats; i < 256; i++) {
red[i] = pal[(num_in - 1) * 3] << 8;
green[i] = pal[(num_in - 1) * 3 + 1] << 8;
blue[i] = pal[(num_in - 1) * 3 + 2] << 8;
}
bool changed = (memcmp(red, last_gamma_red, 512) != 0 ||
memcmp(green, last_gamma_green, 512) != 0 ||
memcmp(blue, last_gamma_blue, 512) != 0);
memcmp(blue, last_gamma_blue, 512) != 0);
if (changed) {
int result = SDL_SetWindowGammaRamp(sdl_window, red, green, blue);