From d730844f654a198a293f853dc897c857a5f886a2 Mon Sep 17 00:00:00 2001
From: KikooDX <kikoodx@paranoici.org>
Date: Wed, 26 May 2021 13:41:38 +0200
Subject: [PATCH] display system

It works. self.state = Happy;
---
 CMakeLists.txt     |  4 ++++
 include/disp.h     |  9 +++++++++
 src/disp/clear.c   |  7 +++++++
 src/disp/display.c | 35 +++++++++++++++++++++++++++++++++++
 src/disp/init.c    |  9 +++++++++
 src/disp/print.c   | 20 ++++++++++++++++++++
 src/main.c         |  5 +++++
 7 files changed, 89 insertions(+)
 create mode 100644 include/disp.h
 create mode 100644 src/disp/clear.c
 create mode 100644 src/disp/display.c
 create mode 100644 src/disp/init.c
 create mode 100644 src/disp/print.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
index aa2531d..a46d30a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,6 +14,10 @@ include_directories(include)
 
 set(SOURCES
 	src/main.c
+	src/disp/display.c
+	src/disp/print.c
+	src/disp/init.c
+	src/disp/clear.c
 )
 
 set(ASSETS
diff --git a/include/disp.h b/include/disp.h
new file mode 100644
index 0000000..517e314
--- /dev/null
+++ b/include/disp.h
@@ -0,0 +1,9 @@
+#pragma once
+
+#define DISP_BUFFER_SIZE 1024
+extern char disp_buffer[DISP_BUFFER_SIZE];
+
+void disp_init(void);
+void disp_clear(void);
+int disp_print(char *text);
+void disp_display(void);
diff --git a/src/disp/clear.c b/src/disp/clear.c
new file mode 100644
index 0000000..f736112
--- /dev/null
+++ b/src/disp/clear.c
@@ -0,0 +1,7 @@
+#include "disp.h"
+
+void
+disp_clear(void)
+{
+	disp_buffer[0] = '\0';
+}
diff --git a/src/disp/display.c b/src/disp/display.c
new file mode 100644
index 0000000..9f3c02f
--- /dev/null
+++ b/src/disp/display.c
@@ -0,0 +1,35 @@
+#include "disp.h"
+#include <gint/display.h>
+#include <gint/keyboard.h>
+
+static void draw_line(int x, int y, char *buffer, int len);
+
+void
+disp_display(void)
+{
+	static int line_height = 0;
+	const int x = 2;
+	int y = 2;
+	char *buffer_cursor = disp_buffer;
+	int line_length = 0;
+
+	if (!line_height)
+		line_height = dfont_default()->line_height;
+
+	while (buffer_cursor[line_length] != '\0') {
+		if (buffer_cursor[line_length] == '\n') {
+			draw_line(x, y, buffer_cursor, line_length);
+			buffer_cursor += line_length + 1;
+			line_length = 0;
+			y += line_height;
+		} else
+			line_length += 1;
+	}
+	draw_line(x, y, buffer_cursor, line_length);
+}
+
+static void
+draw_line(int x, int y, char *buffer, int len)
+{
+	dtext_opt(x, y, C_BLACK, C_NONE, DTEXT_LEFT, DTEXT_TOP, buffer, len);
+}
diff --git a/src/disp/init.c b/src/disp/init.c
new file mode 100644
index 0000000..83699d3
--- /dev/null
+++ b/src/disp/init.c
@@ -0,0 +1,9 @@
+#include "disp.h"
+
+char disp_buffer[DISP_BUFFER_SIZE];
+
+void
+disp_init(void)
+{
+	disp_clear();
+}
diff --git a/src/disp/print.c b/src/disp/print.c
new file mode 100644
index 0000000..0516c88
--- /dev/null
+++ b/src/disp/print.c
@@ -0,0 +1,20 @@
+#include "disp.h"
+
+int
+disp_print(char *text)
+{
+	char *buffer_cursor = disp_buffer;
+	char *text_cursor = text;
+
+	while (*buffer_cursor != '\0')
+		buffer_cursor += 1;
+
+	while (*text_cursor != '\0') {
+		*buffer_cursor = *text_cursor;
+		buffer_cursor += 1;
+		text_cursor += 1;
+	}
+	buffer_cursor[1] = '\0';
+
+	return 0;
+}
diff --git a/src/main.c b/src/main.c
index ece1f4d..22156b9 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,3 +1,4 @@
+#include "disp.h"
 #include <gint/display.h>
 #include <gint/keyboard.h>
 
@@ -6,8 +7,12 @@ main(void)
 {
 	/* init */
 	disp_init();
+	disp_print("Hello, World!\n");
+	disp_print("Draw me an unicorn!\n");
+	disp_print("<Hackcell> UwU\n");
 
 	dclear(C_WHITE);
+	disp_display();
 	dupdate();
 
 	getkey();