From 9f16b032d38613ca95e321e1d1e652c43129c68b Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Sat, 15 Aug 2020 17:42:36 +0200
Subject: Added libgui

---
 libgui/Makefile   | 21 ++++++++++++++++++++
 libgui/inc/vesa.h | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 libgui/vesa.c     | 42 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 120 insertions(+)
 create mode 100644 libgui/Makefile
 create mode 100644 libgui/inc/vesa.h
 create mode 100644 libgui/vesa.c

(limited to 'libgui')

diff --git a/libgui/Makefile b/libgui/Makefile
new file mode 100644
index 0000000..89bbb35
--- /dev/null
+++ b/libgui/Makefile
@@ -0,0 +1,21 @@
+# MIT License, Copyright (c) 2020 Marvin Borner
+
+COBJS = vesa.o
+CC = ../cross/opt/bin/i686-elf-gcc
+LD = ../cross/opt/bin/i686-elf-ld
+OC = ../cross/opt/bin/i686-elf-ar
+
+# Flags to make the binary smaller TODO: Remove after indirect pointer support!
+CSFLAGS = -mpreferred-stack-boundary=2 -fno-asynchronous-unwind-tables -Os
+
+CFLAGS = $(CSFLAGS) -Wall -Wextra -nostdlib -nostdinc -ffreestanding -fno-builtin -mgeneral-regs-only -std=c99 -m32 -pedantic-errors -Iinc/ -I../libc/inc/ -Duserspace -fPIE
+
+%.o: %.c
+	@$(CC) -c $(CFLAGS) $< -o $@
+
+libgui: $(COBJS)
+	@mkdir -p ../build/
+	@$(AR) qc ../build/libgui.a $+
+
+clean:
+	@find . -name "*.o" -type f -delete
diff --git a/libgui/inc/vesa.h b/libgui/inc/vesa.h
new file mode 100644
index 0000000..e34cdc0
--- /dev/null
+++ b/libgui/inc/vesa.h
@@ -0,0 +1,57 @@
+// MIT License, Copyright (c) 2020 Marvin Borner
+
+#ifndef VBE_H
+#define VBE_H
+
+#include <def.h>
+
+struct vbe {
+	u16 attributes;
+	u8 window_a;
+	u8 window_b;
+	u16 granularity;
+	u16 window_size;
+	u16 segment_a;
+	u16 segment_b;
+	u32 win_func_ptr;
+	u16 pitch;
+	u16 width;
+	u16 height;
+	u8 w_char;
+	u8 y_char;
+	u8 planes;
+	u8 bpp;
+	u8 banks;
+	u8 memory_model;
+	u8 bank_size;
+	u8 image_pages;
+	u8 reserved0;
+
+	u8 red_mask;
+	u8 red_position;
+	u8 green_mask;
+	u8 green_position;
+	u8 blue_mask;
+	u8 blue_position;
+	u8 reserved_mask;
+	u8 reserved_position;
+	u8 direct_color_attributes;
+
+	u32 framebuffer;
+	u32 off_screen_mem_off;
+	u16 off_screen_mem_size;
+	u8 reserved1[206];
+};
+
+struct vbe *vbe;
+int vbe_width;
+int vbe_height;
+int vbe_bpl;
+int vbe_pitch;
+u8 *fb;
+
+void vesa_fill(const u32 color[3]);
+void vesa_set_pixel(u16 x, u16 y, const u32 color[3]);
+void vesa_init(struct vbe *info);
+
+#endif
diff --git a/libgui/vesa.c b/libgui/vesa.c
new file mode 100644
index 0000000..2d3e107
--- /dev/null
+++ b/libgui/vesa.c
@@ -0,0 +1,42 @@
+// MIT License, Copyright (c) 2020 Marvin Borner
+
+#include <def.h>
+#include <vesa.h>
+
+void vesa_draw_rectangle(int x1, int y1, int x2, int y2, const u32 color[3])
+{
+	int pos1 = x1 * vbe_bpl + y1 * vbe_pitch;
+	u8 *draw = &fb[pos1];
+	for (int i = 0; i <= y2 - y1; i++) {
+		for (int j = 0; j <= x2 - x1; j++) {
+			draw[vbe_bpl * j] = color[2];
+			draw[vbe_bpl * j + 1] = color[1];
+			draw[vbe_bpl * j + 2] = color[0];
+		}
+		draw += vbe_pitch;
+	}
+}
+
+void vesa_set_pixel(u16 x, u16 y, const u32 color[3])
+{
+	u8 pos = x * vbe_bpl + y * vbe_pitch;
+	u8 *draw = &fb[pos];
+	draw[pos] = (char)color[2];
+	draw[pos + 1] = (char)color[1];
+	draw[pos + 2] = (char)color[0];
+}
+
+void vesa_fill(const u32 color[3])
+{
+	vesa_draw_rectangle(0, 0, vbe->width - 1, vbe->height - 1, color);
+}
+
+void vesa_init(struct vbe *info)
+{
+	vbe = info;
+	vbe_height = vbe->height;
+	vbe_width = vbe->width;
+	vbe_bpl = vbe->bpp >> 3;
+	vbe_pitch = vbe->pitch;
+	fb = (u8 *)vbe->framebuffer;
+}
-- 
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