From c333b69113eb3b1cb98bec74bd69647a4252c27c Mon Sep 17 00:00:00 2001
From: KikooDX <kikoodx@paranoici.org>
Date: Tue, 9 Nov 2021 22:34:40 +0100
Subject: [PATCH] input manager

---
 CMakeLists.txt |  3 ++-
 Makefile       |  7 ++++--
 inc/input.h    | 21 ++++++++++++++++
 src/input.c    | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.c     | 10 +++++---
 5 files changed, 103 insertions(+), 6 deletions(-)
 create mode 100644 inc/input.h
 create mode 100644 src/input.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
index cacd31c..642d3fa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,10 +9,11 @@ include(Fxconv)
 
 find_package(Gint 2.6.0 REQUIRED)
 
-include_directories(include)
+include_directories(inc)
 
 set(SOURCES
 	src/main.c
+	src/input.c
 )
 
 set(LEVELS
diff --git a/Makefile b/Makefile
index 37262b4..6999851 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,11 @@
-all:
+all: format
 	fxsdk build-cg
 
+format:
+	clang-format -style=file -i src/**.c inc/**.h
+
 clean:
 	rm -rf build-cg/
 	rm -f *.g3a
 
-.PHONY: clean
+.PHONY: format clean
diff --git a/inc/input.h b/inc/input.h
new file mode 100644
index 0000000..d73de49
--- /dev/null
+++ b/inc/input.h
@@ -0,0 +1,21 @@
+#pragma once
+/* use this to get user input, NOT gint/keyboard.h */
+
+enum Key { K_A, K_B, K_UP, K_DOWN, K_LEFT, K_RIGHT, K_EXIT, K_COUNT };
+enum KeyState { KS_UP, KS_RELEASE, KS_DOWN, KS_PRESS };
+
+struct Input {
+	int keys[K_COUNT];
+	enum KeyState states[K_COUNT];
+};
+
+/* called by main.c once */
+void input_init(void);
+
+/* call this to update key states once per frame */
+void input_update(void);
+
+int input_down(enum Key);
+int input_pressed(enum Key);
+int input_up(enum Key);
+int input_released(enum Key);
diff --git a/src/input.c b/src/input.c
new file mode 100644
index 0000000..4f3cbda
--- /dev/null
+++ b/src/input.c
@@ -0,0 +1,68 @@
+#include "input.h"
+#include <gint/keyboard.h>
+
+static struct Input input;
+
+void
+input_init(void)
+{
+	int i = K_COUNT;
+	while (i-- > 0) {
+		input.states[i] = KS_UP;
+	}
+	input.keys[K_A] = KEY_SHIFT;
+	input.keys[K_B] = KEY_ALPHA;
+	input.keys[K_LEFT] = KEY_LEFT;
+	input.keys[K_RIGHT] = KEY_RIGHT;
+	input.keys[K_UP] = KEY_UP;
+	input.keys[K_DOWN] = KEY_DOWN;
+	input.keys[K_EXIT] = KEY_EXIT;
+}
+
+void
+input_update(void)
+{
+	int i = K_COUNT;
+	clearevents();
+	while (i-- > 0) {
+		const int kdown = keydown(input.keys[i]);
+		enum KeyState *const state = &input.states[i];
+		const enum KeyState prev_state = input.states[i];
+		switch (prev_state) {
+		case KS_UP:
+		case KS_RELEASE:
+			*state = (kdown) ? (KS_PRESS) : (KS_UP);
+			break;
+		case KS_DOWN:
+		case KS_PRESS:
+			*state = (kdown) ? (KS_DOWN) : (KS_RELEASE);
+			break;
+		default:
+			break;
+		}
+	}
+}
+
+int
+input_down(enum Key k)
+{
+	return input.states[k] == KS_DOWN || input.states[k] == KS_PRESS;
+}
+
+int
+input_pressed(enum Key k)
+{
+	return input.states[k] == KS_PRESS;
+}
+
+int
+input_up(enum Key k)
+{
+	return !input_down(k);
+}
+
+int
+input_released(enum Key k)
+{
+	return input.states[k] == KS_RELEASE;
+}
diff --git a/src/main.c b/src/main.c
index e79e87f..cccc79d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,6 +1,10 @@
-#include <gint/keyboard.h>
+#include "input.h"
 
-int main(void) {
-	getkey();
+int
+main(void)
+{
+	input_init();
+	while (!input_pressed(K_EXIT))
+		input_update();
 	return 1;
 }