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This commit is contained in:
Samuel Walker 2025-02-15 12:52:04 -07:00
parent 821782e60e
commit 97de875bf2
Signed by: piwalker
GPG Key ID: 616B1928705EA4C9
3 changed files with 128 additions and 53 deletions
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12
include/audio.h
View File

@ -99,22 +99,22 @@ typedef struct {
u8 wave_ram[16];
float sq1_history[4410];
float sq1_history[384];
u32 sq1_index;
float sq2_history[4410];
float sq2_history[384];
u32 sq2_index;
float ch3_history[4410];
float ch3_history[384];
u32 ch3_index;
float ch4_history[4410];
float ch4_history[384];
u32 ch4_index;
float left_history[4410];
float left_history[384];
u32 left_index;
float right_history[4410];
float right_history[384];
u32 right_index;
} audio_context;

64
lib/audio.c
View File

@ -26,6 +26,9 @@ static float lfsr_clock = LFSR_BASE_CLOCK;
static float left_cap = 0.0f;
static float right_cap = 0.0f;
static int history_timer = 0;
const int history_interval = 5;
const u8 square_sample_00[8] = {
0x0,
0xF,
@ -115,7 +118,7 @@ static int audio_callback(const void* input_uffer, void *output_buffer,
}
lfsr_timer += TIME_PER_SAMPLE;
for(;lfsr_timer >= lfsr_clock;lfsr_timer -= lfsr_clock) {
if(lfsr_timer >= lfsr_clock && ctx.ch4_enable) {
if(ctx.ch4_enable) {
lfsr_timer = 0;
u8 new = !((ctx.ch4_lfsr & 0b1) ^ ((ctx.ch4_lfsr >> 1) & 0b1)) & 0b1;
ctx.ch4_lfsr |= (new << 15);
@ -183,7 +186,7 @@ static int audio_callback(const void* input_uffer, void *output_buffer,
if(ctx.ch3_volume == 0b11) {
shift = 2;
}
ch3_val = (((float)(ctx.ch3_last_sample >> shift) - 7.5f)/15.0f);
ch3_val = (((float)(ctx.ch3_last_sample >> shift) - 7.5f)/7.5f);
if(ctx.ch3_left) {
left += ch3_val;
//printf("left: %d\n", ctx.ch3_volume);
@ -221,25 +224,6 @@ static int audio_callback(const void* input_uffer, void *output_buffer,
}
}
}
ctx.sq1_history[ctx.sq1_index++] = sq1_val;
if (ctx.sq1_index == 4410) {
ctx.sq1_index = 0;
}
ctx.sq2_history[ctx.sq2_index++] = sq2_val;
if (ctx.sq2_index == 4410) {
ctx.sq2_index = 0;
}
ctx.ch3_history[ctx.ch3_index++] = ch3_val;
if (ctx.ch3_index == 4410) {
ctx.ch3_index = 0;
}
ctx.ch4_history[ctx.ch4_index++] = ch4_val;
if (ctx.ch4_index == 4410) {
ctx.ch4_index = 0;
}
u8 left_vol = ctx.volume_left == 0 ? 1 : ctx.volume_left;
u8 right_vol = ctx.volume_right == 0 ? 1 : ctx.volume_right;
left *= (float)left_vol/7.0f;
@ -266,14 +250,37 @@ static int audio_callback(const void* input_uffer, void *output_buffer,
if(left_out < -1.0f) {
printf("Uh Oh! %f\n", left_out);
}
ctx.left_history[ctx.left_index++] = left_out;
if (ctx.left_index == 4410) {
ctx.left_index = 0;
}
history_timer++;
if(history_timer >= history_interval){
history_timer = 0;
ctx.sq1_history[ctx.sq1_index++] = sq1_val;
if (ctx.sq1_index == 384) {
ctx.sq1_index = 0;
}
ctx.right_history[ctx.right_index++] = right_out;
if (ctx.right_index == 4410) {
ctx.right_index = 0;
ctx.sq2_history[ctx.sq2_index++] = sq2_val;
if (ctx.sq2_index == 384) {
ctx.sq2_index = 0;
}
ctx.ch3_history[ctx.ch3_index++] = ch3_val;
if (ctx.ch3_index == 384) {
ctx.ch3_index = 0;
}
ctx.ch4_history[ctx.ch4_index++] = ch4_val;
if (ctx.ch4_index == 384) {
ctx.ch4_index = 0;
}
ctx.left_history[ctx.left_index++] = left_out;
if (ctx.left_index == 384) {
ctx.left_index = 0;
}
ctx.right_history[ctx.right_index++] = right_out;
if (ctx.right_index == 384) {
ctx.right_index = 0;
}
}
*out++ = left_out;
@ -457,7 +464,6 @@ void audio_tick(){
if(ctx.ch4_volume > 15)
ctx.ch4_volume = 15;
}
//printf("sq2 vol: %01X\n", ctx.sq2_volume);
}
}

105
lib/ui.c
View File

@ -131,12 +131,27 @@ void ui_update() {
SDL_UpdateTexture(sdlTexture, NULL, screen->pixels, screen->pitch);
SDL_RenderClear(sdlRenderer);
SDL_RenderCopy(sdlRenderer, sdlTexture, NULL, NULL);
TTF_Font* sans = TTF_OpenFont("Sans.ttf", 24);
if ( !sans ) {
printf("Failed to load font: %s\n", TTF_GetError());
}
SDL_Color text_color = {255,255,255};
int yOffset = 50;
int lastY = (yOffset) + (audio_get_context()->sq1_history[0] * 50);
int lastY = (yOffset) - (audio_get_context()->sq1_history[audio_get_context()->sq1_index] * 50);
int xOffset = XRES*scale;
SDL_Surface* message = TTF_RenderText_Solid(sans, "Square 1", text_color);
SDL_Texture* messageTexture = SDL_CreateTextureFromSurface(sdlRenderer, message);
SDL_Rect messageRect;
messageRect.x = xOffset;
messageRect.y = yOffset-50;
messageRect.w = 50;
messageRect.h = 20;
SDL_RenderCopy(sdlRenderer, messageTexture, NULL, &messageRect);
SDL_SetRenderDrawColor(sdlRenderer, 0, 255, 0, 255);
for(int x = 1; x < 882; x++){
int y = (yOffset) + (audio_get_context()->sq1_history[x*5] * 50);
SDL_FreeSurface(message);
SDL_DestroyTexture(messageTexture);
for(int x = 1; x < 384; x++){
int y = (yOffset) - (audio_get_context()->sq1_history[(x + audio_get_context()->sq1_index) % 384] * 50);
SDL_RenderDrawLine(sdlRenderer, x-1+xOffset, lastY, x+xOffset, y);
lastY = y;
if(x+xOffset == SCREEN_WIDTH) {
@ -145,10 +160,20 @@ void ui_update() {
}
yOffset = 150;
lastY = (yOffset) + (audio_get_context()->sq2_history[0] * 50);
lastY = (yOffset) - (audio_get_context()->sq2_history[audio_get_context()->sq2_index] * 50);
message = TTF_RenderText_Solid(sans, "Square 2", text_color);
messageTexture = SDL_CreateTextureFromSurface(sdlRenderer, message);
messageRect.x = xOffset;
messageRect.y = yOffset-50;
messageRect.w = 50;
messageRect.h = 20;
SDL_RenderCopy(sdlRenderer, messageTexture, NULL, &messageRect);
SDL_SetRenderDrawColor(sdlRenderer, 0, 255, 0, 255);
for(int x = 1; x < 882; x++){
int y = (yOffset) + (audio_get_context()->sq2_history[x*5] * 50);
SDL_FreeSurface(message);
SDL_DestroyTexture(messageTexture);
SDL_SetRenderDrawColor(sdlRenderer, 0, 255, 0, 255);
for(int x = 1; x < 384; x++){
int y = (yOffset) - (audio_get_context()->sq2_history[(x + audio_get_context()->sq2_index) % 384] * 50);
SDL_RenderDrawLine(sdlRenderer, x-1+xOffset, lastY, x+xOffset, y);
lastY = y;
if(x+xOffset == SCREEN_WIDTH) {
@ -157,10 +182,21 @@ void ui_update() {
}
yOffset = 250;
lastY = (yOffset) + (audio_get_context()->ch3_history[0] * 50);
lastY = (yOffset) - (audio_get_context()->ch3_history[audio_get_context()->ch3_index] * 50);
message = TTF_RenderText_Solid(sans, "Wave", text_color);
messageTexture = SDL_CreateTextureFromSurface(sdlRenderer, message);
messageRect.x = xOffset;
messageRect.y = yOffset-50;
messageRect.w = 50;
messageRect.h = 20;
SDL_RenderCopy(sdlRenderer, messageTexture, NULL, &messageRect);
SDL_SetRenderDrawColor(sdlRenderer, 0, 255, 0, 255);
for(int x = 1; x < 882; x++){
int y = (yOffset) + (audio_get_context()->ch3_history[x*5] * 50);
SDL_FreeSurface(message);
SDL_DestroyTexture(messageTexture);
SDL_SetRenderDrawColor(sdlRenderer, 0, 255, 0, 255);
SDL_SetRenderDrawColor(sdlRenderer, 0, 255, 0, 255);
for(int x = 1; x < 384; x++){
int y = (yOffset) - (audio_get_context()->ch3_history[(x + audio_get_context()->ch3_index) % 384] * 50);
SDL_RenderDrawLine(sdlRenderer, x-1+xOffset, lastY, x+xOffset, y);
lastY = y;
if(x+xOffset == SCREEN_WIDTH) {
@ -169,10 +205,21 @@ void ui_update() {
}
yOffset = 350;
lastY = (yOffset) + (audio_get_context()->ch4_history[0] * 50);
lastY = (yOffset) - (audio_get_context()->ch4_history[audio_get_context()->ch4_index] * 50);
message = TTF_RenderText_Solid(sans, "Noise", text_color);
messageTexture = SDL_CreateTextureFromSurface(sdlRenderer, message);
messageRect.x = xOffset;
messageRect.y = yOffset-50;
messageRect.w = 50;
messageRect.h = 20;
SDL_RenderCopy(sdlRenderer, messageTexture, NULL, &messageRect);
SDL_SetRenderDrawColor(sdlRenderer, 0, 255, 0, 255);
for(int x = 1; x < 882; x++){
int y = (yOffset) + (audio_get_context()->ch4_history[x*5] * 50);
SDL_FreeSurface(message);
SDL_DestroyTexture(messageTexture);
SDL_SetRenderDrawColor(sdlRenderer, 0, 255, 0, 255);
SDL_SetRenderDrawColor(sdlRenderer, 0, 255, 0, 255);
for(int x = 1; x < 384; x++){
int y = (yOffset) - (audio_get_context()->ch4_history[(x + audio_get_context()->ch4_index) % 384] * 50);
SDL_RenderDrawLine(sdlRenderer, x-1+xOffset, lastY, x+xOffset, y);
lastY = y;
if(x+xOffset == SCREEN_WIDTH) {
@ -181,10 +228,21 @@ void ui_update() {
}
yOffset = 450;
lastY = (yOffset) + (audio_get_context()->left_history[0] * 50);
lastY = (yOffset) - (audio_get_context()->left_history[audio_get_context()->left_index] * 50);
message = TTF_RenderText_Solid(sans, "Left Out", text_color);
messageTexture = SDL_CreateTextureFromSurface(sdlRenderer, message);
messageRect.x = xOffset;
messageRect.y = yOffset-50;
messageRect.w = 50;
messageRect.h = 20;
SDL_RenderCopy(sdlRenderer, messageTexture, NULL, &messageRect);
SDL_SetRenderDrawColor(sdlRenderer, 0, 255, 0, 255);
SDL_FreeSurface(message);
SDL_DestroyTexture(messageTexture);
SDL_SetRenderDrawColor(sdlRenderer, 0, 255, 0, 255);
SDL_SetRenderDrawColor(sdlRenderer, 0, 0, 255, 255);
for(int x = 1; x < 882; x++){
int y = (yOffset) + (audio_get_context()->left_history[x*5] * 50);
for(int x = 1; x < 384; x++){
int y = (yOffset) - (audio_get_context()->left_history[(x + audio_get_context()->left_index) % 384] * 50);
SDL_RenderDrawLine(sdlRenderer, x-1+xOffset, lastY, x+xOffset, y);
lastY = y;
if(x+xOffset == SCREEN_WIDTH) {
@ -193,10 +251,21 @@ void ui_update() {
}
yOffset = 550;
lastY = (yOffset) + (audio_get_context()->right_history[0] * 50);
lastY = (yOffset) - (audio_get_context()->right_history[audio_get_context()->right_index] * 50);
message = TTF_RenderText_Solid(sans, "Right Out", text_color);
messageTexture = SDL_CreateTextureFromSurface(sdlRenderer, message);
messageRect.x = xOffset;
messageRect.y = yOffset-50;
messageRect.w = 50;
messageRect.h = 20;
SDL_RenderCopy(sdlRenderer, messageTexture, NULL, &messageRect);
SDL_SetRenderDrawColor(sdlRenderer, 0, 255, 0, 255);
SDL_FreeSurface(message);
SDL_DestroyTexture(messageTexture);
SDL_SetRenderDrawColor(sdlRenderer, 0, 255, 0, 255);
SDL_SetRenderDrawColor(sdlRenderer, 0, 0, 255, 255);
for(int x = 1; x < 882; x++){
int y = (yOffset) + (audio_get_context()->right_history[x*5] * 50);
for(int x = 1; x < 384; x++){
int y = (yOffset) - (audio_get_context()->right_history[(x + audio_get_context()->right_index) % 384] * 50);
SDL_RenderDrawLine(sdlRenderer, x-1+xOffset, lastY, x+xOffset, y);
lastY = y;
if(x+xOffset == SCREEN_WIDTH) {