Add conditional redrawing

This covers most of the previous functionality, but separating the input
handling and rendering functions. Only cursor drawing and a few corner
cases missing.

1 files changed, 45 insertions, 19 deletions

diff --git a/src/main.c b/src/main.c
index 8ee4945..b6be6b9 100644
--- a/src/main.c
+++ b/src/main.c
@@ -21,27 +21,53 @@ WITH REGARD TO THIS SOFTWARE.
 
 void
 render(void) {
-    // TODO: Make sure we are drawing the proper cursor color.
     // TODO: Decouple update from rendering.
-    PROF(screen_fill(0), clear_cycles);
+    // PROF(screen_fill(0), clear_cycles);
     PROF(draw_rect(0, 0, SCREEN_WIDTH - 1, SCREEN_HEIGHT - 1, 1), clear_cycles);
-    PROF(draw_triggers(), draw_trigs_cycles);
-    PROF(draw_channels(), draw_btn_cycles);
-    PROF(draw_pattern_buttons(), draw_btn_cycles);
-    PROF(draw_bank_buttons(), draw_btn_cycles);
-    PROF(draw_bpm(), draw_btn_cycles);
-    PROF(draw_play(), draw_btn_cycles);
-    PROF(draw_stop(), draw_btn_cycles);
-    PROF(draw_piano(), draw_piano_cycles);
-    // TODO: Draw the notes currently playing with a fade off animation for the
-    // first 3 channels.
-    TriggerNote *trig = get_current_trig();
-    PROF(draw_note(trig->note, COL_NOTE_PRESSED), draw_piano_cycles);
-    PROF(draw_parameters(), draw_param_cycles);
-    PROF(draw_trig_cursor(trig_selection_loc, COL_CURSOR), draw_cursor_cycles);
-    PROF(draw_channel_cursor(channel_selection_loc, COL_GREY), draw_cursor_cycles);
-    PROF(draw_pattern_cursor(pattern_selection_loc, COL_GREY), draw_cursor_cycles);
-    PROF(draw_current_step(COL_RED), draw_cursor_cycles);
+    if (redraw_trigs) {
+        PROF(draw_triggers(), draw_trigs_cycles);
+        redraw_trigs = false;
+    }
+    if (redraw_channels) {
+        PROF(draw_channels(), draw_btn_cycles);
+        redraw_channels = false;
+    }
+    if (redraw_pattern_buttons) {
+        PROF(draw_pattern_buttons(), draw_btn_cycles);
+        redraw_pattern_buttons = false;
+    }
+    if (redraw_bank_buttons) {
+        PROF(draw_bank_buttons(), draw_btn_cycles);
+        redraw_bank_buttons = false;
+    }
+    if (redraw_bpm) {
+        PROF(draw_bpm(), draw_btn_cycles);
+        redraw_bpm = false;
+    }
+    if (redraw_play_pause) {
+        PROF(draw_play(), draw_btn_cycles);
+        PROF(draw_stop(), draw_btn_cycles);
+        redraw_play_pause = false;
+    }
+    if (redraw_piano_note) {
+        PROF(draw_piano(), draw_piano_cycles);
+        // TODO: Draw the notes currently playing with a fade off animation for
+        // the first 3 channels.
+        TriggerNote *trig = get_current_trig();
+        PROF(draw_note(trig->note, COL_NOTE_PRESSED), draw_piano_cycles);
+        redraw_piano_note = false;
+    }
+    if (redraw_params) {
+        PROF(draw_parameters(), draw_param_cycles);
+        redraw_params = false;
+    }
+
+    // TODO: Make sure we are drawing the cursors properly.
+    // PROF(draw_trig_cursor(trig_selection_loc, COL_CURSOR), draw_cursor_cycles);
+    // PROF(draw_channel_cursor(channel_selection_loc, COL_GREY), draw_cursor_cycles);
+    // PROF(draw_pattern_cursor(pattern_selection_loc, COL_GREY), draw_cursor_cycles);
+
+    // PROF(draw_current_step(COL_RED), draw_cursor_cycles);
 }
 
 int