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Add gamma support for direct color modes

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This commit is contained in:
rakslice 2020-08-17 21:05:08 -07:00
parent ecef51bc47
commit ffee1ebad2
2 changed files with 76 additions and 3 deletions
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36
BasiliskII/src/SDL/video_sdl2.cpp
View File

@ -700,6 +700,10 @@ static void shutdown_sdl_video()
delete_sdl_video_window();
}
static uint16 last_gamma_red[256];
static uint16 last_gamma_green[256];
static uint16 last_gamma_blue[256];
static SDL_Surface * init_sdl_video(int width, int height, int bpp, Uint32 flags)
{
if (guest_surface) {
@ -1739,9 +1743,37 @@ void SDL_monitor_desc::set_palette(uint8 *pal, int num_in)
{
const VIDEO_MODE &mode = get_current_mode();
// FIXME: how can we handle the gamma ramp?
if ((int)VIDEO_MODE_DEPTH > VIDEO_DEPTH_8BIT)
if ((int)VIDEO_MODE_DEPTH > VIDEO_DEPTH_8BIT) {
// handle the gamma ramp
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;
}
bool changed = (memcmp(red, last_gamma_red, 512) != 0 ||
memcmp(green, last_gamma_green, 512) != 0 ||
memcmp(blue, last_gamma_blue, 512) != 0);
if (changed) {
int result = SDL_SetWindowGammaRamp(sdl_window, red, green, blue);
if (result < 0) {
printf("SDL_SetWindowGammaRamp returned %d, SDL error:", result, SDL_GetError());
}
memcpy(last_gamma_red, red, 512);
memcpy(last_gamma_green, green, 512);
memcpy(last_gamma_blue, blue, 512);
}
return;
}
LOCK_PALETTE;

43
SheepShaver/src/video.cpp
View File

@ -211,6 +211,10 @@ static bool allocate_gamma_table(VidLocals *csSave, uint32 size)
return true;
}
static inline uint8 max(uint8 a, uint8 b) {
return a > b? a : b;
}
static int16 set_gamma(VidLocals *csSave, uint32 gamma)
{
if (gamma == 0) { // Build linear ramp, 256 entries
@ -229,8 +233,11 @@ static int16 set_gamma(VidLocals *csSave, uint32 gamma)
// Build the linear ramp
uint32 p = csSave->gammaTable + gFormulaData;
for (int i=0; i<256; i++)
for (int i=0; i<256; i++) {
WriteMacInt8(p + i, i);
mac_pal[i].red = mac_pal[i].green = mac_pal[i].blue = i;
}
} else { // User-supplied gamma table
@ -256,7 +263,41 @@ static int16 set_gamma(VidLocals *csSave, uint32 gamma)
// Copy table
Mac2Mac_memcpy(csSave->gammaTable, gamma, size);
// Save new gamma data for video impl
if (data_width != 8) {
// FIXME: handle bit-packed data
} else {
uint32 p = csSave->gammaTable + gFormulaData + gFormulaSize;
uint32 p_red;
uint32 p_green;
uint32 p_blue;
// make values increasing as some implementations really don't like it when gamma tables aren't
uint8 max_red = 0;
uint8 max_green = 0;
uint8 max_blue = 0;
if (chan_cnt == 3) {
p_red = p;
p_green = p + data_cnt;
p_blue = p + data_cnt * 2;
} else {
p_red = p_green = p_blue = p;
}
for (int i=0; i < data_cnt; i++) {
max_red = max(max_red, ReadMacInt8(p_red++));
max_green = max(max_green, ReadMacInt8(p_green++));
max_blue = max(max_blue, ReadMacInt8(p_blue++));
mac_pal[i].red = max_red;
mac_pal[i].green = max_green;
mac_pal[i].blue = max_blue;
}
}
}
video_set_palette();
return noErr;
}