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Highpass filter in SDL

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This commit is contained in:
Lior Halphon 2017-12-23 21:11:44 +02:00
parent 3c1a805770
commit dc59fdf40e
4 changed files with 62 additions and 11 deletions
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1
Core/apu.h
View File

@ -103,6 +103,7 @@ typedef enum {
GB_HIGHPASS_OFF, // Do not apply any filter, keep DC offset
GB_HIGHPASS_ACCURATE, // Apply a highpass filter similar to the one used on hardware
GB_HIGHPASS_REMOVE_DC_OFFSET, // Remove DC Offset without affecting the waveform
GB_HIGHPASS_MAX
} GB_highpass_mode_t;
typedef struct {

47
SDL/gui.c
View File

@ -58,6 +58,7 @@ configuration_t configuration =
SDL_SCANCODE_SPACE
},
.color_correction_mode = GB_COLOR_CORRECTION_EMULATE_HARDWARE,
.highpass_mode = GB_HIGHPASS_ACCURATE,
.scaling_mode = GB_SDL_SCALING_INTEGER_FACTOR,
.blend_frames = true
};
@ -227,10 +228,12 @@ static void item_help(unsigned index)
static void enter_graphics_menu(unsigned index);
static void enter_controls_menu(unsigned index);
static void enter_joypad_menu(unsigned index);
static void enter_audio_menu(unsigned index);
static const struct menu_item paused_menu[] = {
{"Resume", NULL},
{"Graphic Options", enter_graphics_menu},
{"Audio Options", enter_audio_menu},
{"Keyboard", enter_controls_menu},
{"Joypad", enter_joypad_menu},
{"Help", item_help},
@ -238,14 +241,7 @@ static const struct menu_item paused_menu[] = {
{NULL,}
};
static const struct menu_item nonpaused_menu[] = {
{"Graphic Options", enter_graphics_menu},
{"Keyboard", enter_controls_menu},
{"Joypad", enter_joypad_menu},
{"Help", item_help},
{"Exit", item_exit},
{NULL,}
};
static const struct menu_item *const nonpaused_menu = &paused_menu[1];
const char *current_scaling_mode(unsigned index)
{
@ -409,6 +405,41 @@ static void enter_graphics_menu(unsigned index)
current_selection = 0;
}
const char *highpass_filter_string(unsigned index)
{
return (const char *[]){"None (Keep DC Offset)", "Accurate", "Preserve Waveform"}
[configuration.highpass_mode];
}
void cycle_highpass_filter(unsigned index)
{
configuration.highpass_mode++;
if (configuration.highpass_mode == GB_HIGHPASS_MAX) {
configuration.highpass_mode = 0;
}
}
void cycle_highpass_filter_backwards(unsigned index)
{
if (configuration.highpass_mode == 0) {
configuration.highpass_mode = GB_HIGHPASS_MAX - 1;
}
else {
configuration.highpass_mode--;
}
}
static const struct menu_item audio_menu[] = {
{"Highpass Filter:", cycle_highpass_filter, highpass_filter_string, cycle_highpass_filter_backwards},
{"Back", return_to_root_menu},
{NULL,}
};
static void enter_audio_menu(unsigned index)
{
current_menu = audio_menu;
current_selection = 0;
}
static const char *key_name(unsigned index)
{
return SDL_GetScancodeName(configuration.keys[index]);

2
SDL/gui.h
View File

@ -37,6 +37,8 @@ typedef struct {
enum scaling_mode scaling_mode;
bool blend_frames;
GB_highpass_mode_t highpass_mode;
bool div_joystick;
bool flip_joystick_bit_1;
bool swap_joysticks_bits_1_and_2;

23
SDL/main.c
View File

@ -119,8 +119,16 @@ static void handle_events(GB_gameboy_t *gb)
GB_set_turbo_mode(gb, event.type == SDL_JOYBUTTONDOWN, false);
}
else {
bool audio_playing = SDL_GetAudioStatus() == SDL_AUDIO_PLAYING;
if (audio_playing) {
SDL_PauseAudio(true);
}
run_gui(true);
if (audio_playing) {
SDL_PauseAudio(false);
}
GB_set_color_correction_mode(gb, configuration.color_correction_mode);
GB_set_highpass_filter_mode(gb, configuration.highpass_mode);
}
break;
@ -137,11 +145,19 @@ static void handle_events(GB_gameboy_t *gb)
case SDL_KEYDOWN:
switch (event.key.keysym.scancode) {
case SDL_SCANCODE_ESCAPE:
case SDL_SCANCODE_ESCAPE: {
bool audio_playing = SDL_GetAudioStatus() == SDL_AUDIO_PLAYING;
if (audio_playing) {
SDL_PauseAudio(true);
}
run_gui(true);
if (audio_playing) {
SDL_PauseAudio(false);
}
GB_set_color_correction_mode(gb, configuration.color_correction_mode);
GB_set_highpass_filter_mode(gb, configuration.highpass_mode);
break;
}
case SDL_SCANCODE_C:
if (event.type == SDL_KEYDOWN && (event.key.keysym.mod & KMOD_CTRL)) {
GB_debugger_break(gb);
@ -318,6 +334,7 @@ restart:
GB_set_rgb_encode_callback(&gb, rgb_encode);
GB_set_sample_rate(&gb, have_aspec.freq);
GB_set_color_correction_mode(&gb, configuration.color_correction_mode);
GB_set_highpass_filter_mode(&gb, configuration.highpass_mode);
}
bool error = false;
@ -435,7 +452,6 @@ usage:
SDL_OpenAudio(&want_aspec, &have_aspec);
/* Start Audio */
SDL_PauseAudio(false);
SDL_EventState(SDL_DROPFILE, SDL_ENABLE);
@ -447,6 +463,7 @@ usage:
if (filename == NULL) {
run_gui(false);
}
SDL_PauseAudio(false);
run(); // Never returns
return 0;
}