From 0fa40db0a578cc2dc3952fe108a332a1e3182452 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Mon, 24 Apr 2023 11:39:58 +0200
Subject: Add quick BPM adjustment with SEL+L/R

---
 src/sequencer.c | 61 ++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 43 insertions(+), 18 deletions(-)

(limited to 'src/sequencer.c')

diff --git a/src/sequencer.c b/src/sequencer.c
index 784d132..2940b25 100644
--- a/src/sequencer.c
+++ b/src/sequencer.c
@@ -19,13 +19,15 @@ bool redraw_bpm = true;
 bool redraw_piano_note = true;
 
 void
-irq_timer(void) {
-    if (current_pattern != next_pattern && step_counter == 0) {
+play_step(void) {
+    if (current_pattern != next_pattern && step_counter == 15) {
         current_pattern = next_pattern;
         redraw_pattern_buttons = true;
+        set_time(patterns[current_pattern].bpm);
+        play_step();
+        return;
     }
     Pattern *pat = &patterns[current_pattern];
-    set_time(pat->bpm);
     if (pat->ch1.active) {
         TriggerNote *trig = &pat->ch1.notes[step_counter];
         ChannelSquareParams *params = &pat->ch1.params[step_counter];
@@ -156,7 +158,7 @@ set_time(int bpm) {
     // We have to operate on integer values, so the numbers have been
     // precalculated to `n_ticks = 244181 / bmp`
     int n_ticks = -244181 / bpm;
-    irs_set(IRQ_TIMER_0, irq_timer);
+    irs_set(IRQ_TIMER_0, play_step);
     TIMER_DATA_0 = n_ticks;
     TIMER_CTRL_0 = TIMER_CTRL_IRQ | TIMER_CTRL_ENABLE | TIMER_CTRL_FREQ_3;
 }
@@ -242,7 +244,12 @@ toggle_playing(void) {
     play_status ^= 1;
     step_counter = 0;
     if ((TIMER_CTRL_0 & TIMER_CTRL_ENABLE) == 0) {
+        if (current_pattern != next_pattern) {
+            current_pattern = next_pattern;
+            redraw_pattern_buttons = true;
+        }
         set_time(patterns[current_pattern].bpm);
+        play_step();
     } else {
         TIMER_CTRL_0 ^= TIMER_CTRL_ENABLE;
         SOUND_SQUARE1_CTRL = 0;
@@ -257,7 +264,12 @@ void
 pause_playing(void) {
     play_status ^= 1;
     if ((TIMER_CTRL_0 & TIMER_CTRL_ENABLE) == 0) {
+        if (current_pattern != next_pattern && step_counter == 0) {
+            current_pattern = next_pattern;
+            redraw_pattern_buttons = true;
+        }
         set_time(patterns[current_pattern].bpm);
+        play_step();
     } else {
         TIMER_CTRL_0 ^= TIMER_CTRL_ENABLE;
         SOUND_SQUARE1_CTRL = 0;
@@ -312,27 +324,37 @@ handle_right_col_selection(void) {
     } else if (key_tap(KEY_L)) {
         switch (right_col_selection_loc) {
             case R_COL_BPM: {
-                if (patterns[pattern_selection_loc].bpm > 10) {
-                    patterns[pattern_selection_loc].bpm--;
-                    if ((TIMER_CTRL_0 & TIMER_CTRL_ENABLE) != 0
-                            && current_pattern == pattern_selection_loc) {
-                        set_time(patterns[current_pattern].bpm);
-                    }
-                    redraw_bpm = true;
+                s32 bpm_inc = -1;
+                if (key_pressed(KEY_SELECT)) {
+                    bpm_inc = -10;
                 }
+                patterns[pattern_selection_loc].bpm = CLAMP(
+                        patterns[pattern_selection_loc].bpm + bpm_inc,
+                        10,
+                        300);
+                if ((TIMER_CTRL_0 & TIMER_CTRL_ENABLE) != 0
+                        && current_pattern == pattern_selection_loc) {
+                    set_time(patterns[current_pattern].bpm);
+                }
+                redraw_bpm = true;
             } break;
         }
     } else if (key_tap(KEY_R)) {
         switch (right_col_selection_loc) {
             case R_COL_BPM: {
-                if (patterns[pattern_selection_loc].bpm < 300) {
-                    patterns[pattern_selection_loc].bpm++;
-                    if ((TIMER_CTRL_0 & TIMER_CTRL_ENABLE) != 0
-                            && current_pattern == pattern_selection_loc) {
-                        set_time(patterns[current_pattern].bpm);
-                    }
-                    redraw_bpm = true;
+                s32 bpm_inc = 1;
+                if (key_pressed(KEY_SELECT)) {
+                    bpm_inc = 10;
+                }
+                patterns[pattern_selection_loc].bpm = CLAMP(
+                        patterns[pattern_selection_loc].bpm + bpm_inc,
+                        10,
+                        300);
+                if ((TIMER_CTRL_0 & TIMER_CTRL_ENABLE) != 0
+                        && current_pattern == pattern_selection_loc) {
+                    set_time(patterns[current_pattern].bpm);
                 }
+                redraw_bpm = true;
             } break;
         }
     } else if (key_tap(KEY_B)) {
@@ -830,6 +852,9 @@ handle_sequencer_input(void) {
             clipboard_copy();
             input_handler();
         }
+        if (input_handler == handle_right_col_selection) {
+            input_handler();
+        }
         // Clipboard combo.
         else if (key_tap(KEY_A)) {
             clipboard_paste();
-- 
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