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Improvements to the SGB animation

This commit is contained in:
Lior Halphon 2018-12-01 13:39:43 +02:00
parent 6d28e74667
commit b1a2e45168
4 changed files with 34 additions and 9 deletions
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2
Core/gb.c
View File

@ -663,6 +663,8 @@ void GB_reset(GB_gameboy_t *gb)
memset(gb->sgb, 0, sizeof(*gb->sgb));
memset(gb->sgb_intro_jingle_phases, 0, sizeof(gb->sgb_intro_jingle_phases));
gb->sgb_intro_sweep_phase = 0;
gb->sgb_intro_sweep_previous_sample = 0;
gb->sgb->intro_animation = -10;
gb->sgb->player_count = 1;
GB_sgb_load_default_data(gb);

1
Core/gb.h
View File

@ -567,6 +567,7 @@ struct GB_gameboy_internal_s {
double sgb_intro_jingle_phases[7];
double sgb_intro_sweep_phase;
double sgb_intro_sweep_previous_sample;
/* Misc */
bool turbo;

38
Core/sgb.c
View File

@ -1,7 +1,7 @@
#include "gb.h"
#include <math.h>
#define INTRO_ANIMATION_LENGTH 180
#define INTRO_ANIMATION_LENGTH 200
enum {
PAL01 = 0x00,
@ -353,11 +353,11 @@ static void render_boot_animation (GB_gameboy_t *gb)
uint8_t *input = animation_logo;
unsigned fade_blue = 0;
unsigned fade_red = 0;
if (gb->sgb->intro_animation < 32) {
if (gb->sgb->intro_animation < 80 - 32) {
fade_blue = 32;
}
else if (gb->sgb->intro_animation < 64) {
fade_blue = 64 - gb->sgb->intro_animation;
else if (gb->sgb->intro_animation < 80) {
fade_blue = 80 - gb->sgb->intro_animation;
}
else if (gb->sgb->intro_animation > INTRO_ANIMATION_LENGTH - 32) {
fade_red = fade_blue = gb->sgb->intro_animation - INTRO_ANIMATION_LENGTH + 32;
@ -620,10 +620,14 @@ static double fm_sweep(double phase)
{
double ret = 0;
for (unsigned i = 0; i < 8; i++) {
ret += fm_synth((phase) * pow(1.17, i)) * (8 - i) / 36;
ret += sin((phase * M_PI * 2 + sin(phase * M_PI * 8) / 4) * pow(1.25, i)) * (8 - i) / 36;
}
return ret;
}
static double random_double(void)
{
return ((random() % 0x10001) - 0x8000) / (double) 0x8000;
}
bool GB_sgb_render_jingle(GB_gameboy_t *gb, GB_sample_t *dest, size_t count)
{
@ -637,9 +641,23 @@ bool GB_sgb_render_jingle(GB_gameboy_t *gb, GB_sample_t *dest, size_t count)
1567.98, // G6
};
if (gb->sgb->intro_animation < 0) {
for (unsigned i = 0; i < count; i++) {
dest->left = dest->right = 0;
dest++;
}
return true;
}
if (gb->sgb->intro_animation >= INTRO_ANIMATION_LENGTH) return false;
signed jingle_stage = (gb->sgb->intro_animation - 60) / 3;
signed jingle_stage = (gb->sgb->intro_animation - 64) / 3;
double sweep_cutoff_ratio = 2000.0 * pow(2, gb->sgb->intro_animation / 20.0) / gb->apu_output.sample_rate;
double sweep_phase_shift = 1000.0 * pow(2, gb->sgb->intro_animation / 40.0) / gb->apu_output.sample_rate;
if (sweep_cutoff_ratio > 1) {
sweep_cutoff_ratio = 1;
}
for (unsigned i = 0; i < count; i++) {
double sample = 0;
for (signed f = 0; f < 7 && f < jingle_stage; f++) {
@ -652,8 +670,12 @@ bool GB_sgb_render_jingle(GB_gameboy_t *gb, GB_sample_t *dest, size_t count)
}
if (gb->sgb->intro_animation < 120) {
sample += fm_sweep(gb->sgb_intro_sweep_phase) / 2.0 * pow((120 - gb->sgb->intro_animation) / 120.0, 2);
gb->sgb_intro_sweep_phase += (1000.0 * pow(2, gb->sgb->intro_animation / 40.0)) / gb->apu_output.sample_rate;
double next = fm_sweep(gb->sgb_intro_sweep_phase) * 0.3 + random_double() * 0.7;
gb->sgb_intro_sweep_phase += sweep_phase_shift;
gb->sgb_intro_sweep_previous_sample = next * (sweep_cutoff_ratio) +
gb->sgb_intro_sweep_previous_sample * (1 - sweep_cutoff_ratio);
sample += gb->sgb_intro_sweep_previous_sample * pow((120 - gb->sgb->intro_animation) / 120.0, 2) * 0.8;
}
dest->left = dest->right = sample * 0x7000;

2
Core/sgb.h
View File

@ -48,7 +48,7 @@ struct GB_sgb_s {
uint8_t attribute_files[0xFE0];
/* Intro */
uint16_t intro_animation;
int16_t intro_animation;
};
void GB_sgb_write(GB_gameboy_t *gb, uint8_t value);