From efbee96caa1452486a007eeeabb5073aa9025dae Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Sat, 22 May 2021 23:07:17 +0200
Subject: Update mouse control code to use key taps instead of press

---
 src/common.h | 16 ++++++++++++++--
 src/main.c   | 37 ++++++++++++++++++-------------------
 2 files changed, 32 insertions(+), 21 deletions(-)

(limited to 'src')

diff --git a/src/common.h b/src/common.h
index e293770..08736ea 100644
--- a/src/common.h
+++ b/src/common.h
@@ -301,14 +301,26 @@ poll_keys(void) {
 // function will return `true` only on the frame where the key initially
 // activated.
 static inline u32
-key_pressed(u32 key) {
+key_tap(u32 key) {
     return (key_curr & key) & ~(key_prev & key);
 }
 
+// Check if a given key is currently pressed.
+static inline u32
+key_pressed(u32 key) {
+    return (key_curr & key);
+}
+
+// Check if a given key was just released.
+static inline u32
+key_released(u32 key) {
+    return ~(key_curr & key) & (key_prev & key);
+}
+
 // Check if the given key is pressed and has been since at least one frame.
 static inline u32
 key_hold(u32 key) {
-    return (key_curr & key) & key_prev & key;
+    return key_curr & key_prev & key;
 }
 
 // Check if the given key/button is currently pressed.
diff --git a/src/main.c b/src/main.c
index a414558..40be7b9 100644
--- a/src/main.c
+++ b/src/main.c
@@ -150,10 +150,11 @@ init_uxn(Uxn *u) {
     mempoke16(devscreen->dat, 4, ppu.ver * 8);
 }
 
+IWRAM_CODE
 void
 handle_input(Uxn *u) {
     poll_keys();
-	if (key_pressed(KEY_SELECT)) {
+	if (key_tap(KEY_SELECT)) {
 	    switch (control_method) {
 	        case CONTROL_CONTROLLER: {
                 devctrl->dat[2] = 0;
@@ -176,42 +177,42 @@ handle_input(Uxn *u) {
         // TODO: We don't need ifs if we use KEY_INPUTS directly and mayvbe just
         // swap some things if needed.
         Uint8 *flag = &devctrl->dat[2];
-        if (key_pressed(KEY_A) | key_hold(KEY_A)) {
+        if (key_pressed(KEY_A)) {
             *flag |= 0x01;
         } else {
             *flag &= ~0x01;
         }
-        if (key_pressed(KEY_B) | key_hold(KEY_B)) {
+        if (key_pressed(KEY_B)) {
             *flag |= 0x02;
         } else {
             *flag &= ~0x02;
         }
-        if (key_pressed(KEY_L) | key_hold(KEY_L)) {
+        if (key_pressed(KEY_L)) {
             *flag |= 0x04;
         } else {
             *flag &= ~0x04;
         }
-        if (key_pressed(KEY_R) | key_hold(KEY_R)) {
+        if (key_pressed(KEY_R)) {
             *flag |= 0x08;
         } else {
             *flag &= ~0x08;
         }
-        if (key_pressed(KEY_UP) | key_hold(KEY_UP)) {
+        if (key_pressed(KEY_UP)) {
             *flag |= 0x10;
         } else {
             *flag &= ~0x10;
         }
-        if (key_pressed(KEY_DOWN) | key_hold(KEY_DOWN)) {
+        if (key_pressed(KEY_DOWN)) {
             *flag |= 0x20;
         } else {
             *flag &= ~0x20;
         }
-        if (key_pressed(KEY_LEFT) | key_hold(KEY_LEFT)) {
+        if (key_pressed(KEY_LEFT)) {
             *flag |= 0x40;
         } else {
             *flag &= ~0x40;
         }
-        if (key_pressed(KEY_RIGHT) | key_hold(KEY_RIGHT)) {
+        if (key_pressed(KEY_RIGHT)) {
             *flag |= 0x80;
         } else {
             *flag &= ~0x80;
@@ -222,14 +223,14 @@ handle_input(Uxn *u) {
     } else if (control_method == CONTROL_MOUSE) {
         // Detect "mouse key press".
 		Uint8 flag = devmouse->dat[6];
-        if (key_pressed(KEY_B) | key_hold(KEY_B)) {
+        if (key_tap(KEY_B)) {
             flag |= 0x01;
-        } else {
+        } else if (key_released(KEY_B)) {
             flag &= ~0x01;
         }
-        if (key_pressed(KEY_A) | key_hold(KEY_A)) {
+        if (key_tap(KEY_A)) {
             flag |= 0x10;
-        } else {
+        } else if (key_released(KEY_A)) {
             flag &= ~0x10;
         }
 
@@ -243,16 +244,14 @@ handle_input(Uxn *u) {
         }
 
         // Detect mouse movement.
-        if (key_pressed(KEY_UP) | key_hold(KEY_UP)) {
+        if (key_pressed(KEY_UP)) {
             mouse.y = CLAMP(mouse.y - MOUSE_DELTA, 0, SCREEN_HEIGHT - 8);
-        }
-        if (key_pressed(KEY_DOWN) | key_hold(KEY_DOWN)) {
+        } else if (key_pressed(KEY_DOWN)) {
             mouse.y = CLAMP(mouse.y + MOUSE_DELTA, 0, SCREEN_HEIGHT - 8);
         }
-        if (key_pressed(KEY_LEFT) | key_hold(KEY_LEFT)) {
+        if (key_pressed(KEY_LEFT)) {
             mouse.x = CLAMP(mouse.x - MOUSE_DELTA, 0, SCREEN_WIDTH - 8);
-        }
-        if (key_pressed(KEY_RIGHT) | key_hold(KEY_RIGHT)) {
+        } else if (key_pressed(KEY_RIGHT)) {
             mouse.x = CLAMP(mouse.x + MOUSE_DELTA, 0, SCREEN_WIDTH - 8);
         }
 
-- 
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