From d4349352a57eb00ce411b4c0542d3207357aecbe Mon Sep 17 00:00:00 2001
From: Aleksa Vuckovic <aleksav013@gmail.com>
Date: Wed, 3 Aug 2022 21:28:15 +0200
Subject: drawing lines to fb

---
 include/debug.h      | 11 +++++++++++
 include/graphics.h   | 32 ++++++++++++++++++++++++++++++++
 include/multiboot2.h | 40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 83 insertions(+)
 create mode 100644 include/debug.h
 create mode 100644 include/graphics.h
 create mode 100644 include/multiboot2.h

(limited to 'include')

diff --git a/include/debug.h b/include/debug.h
new file mode 100644
index 0000000..1c53148
--- /dev/null
+++ b/include/debug.h
@@ -0,0 +1,11 @@
+#ifndef DEBUG_H
+#define DEBUG_H
+
+#include <stdint.h>
+
+void bochs_breakpoint(void);
+void put_in_r8(uint64_t value);
+void put_in_r9(uint64_t value);
+void put_in_r10(uint64_t value);
+
+#endif
diff --git a/include/graphics.h b/include/graphics.h
new file mode 100644
index 0000000..d00e8d8
--- /dev/null
+++ b/include/graphics.h
@@ -0,0 +1,32 @@
+#ifndef GRAPHICS_H
+#define GRAPHICS_H
+
+#include <stdint.h>
+
+struct fb_t {
+	uint64_t addr;
+	uint32_t pitch;
+	uint32_t width;
+	uint32_t height;
+	uint8_t bpp;
+	uint8_t type;
+} __attribute__((packed, aligned(8)));
+typedef struct fb_t fb_t;
+
+extern fb_t fb;
+
+#define RED 	0x00ff0000
+#define GREEN	0x0000ff00
+#define BLUE	0x000000ff
+#define YELLOW	0x00ffff00
+#define PURPLE	0x00ff00ff
+#define WHITE	0x00ffffff
+#define BLACK	0x00000000
+
+uint64_t* pixel_offset(fb_t fb, uint32_t x, uint32_t y);
+void fb_draw_pixel(fb_t fb, uint32_t x, uint32_t y, uint32_t col);
+void fb_draw_line_low(fb_t fb, uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, uint32_t col);
+void fb_draw_line_high(fb_t fb, int32_t x0, int32_t y0, int32_t x1, int32_t y1, int32_t col);
+void fb_draw_line(fb_t fb, int32_t x0, int32_t y0, int32_t x1, int32_t y1, int32_t col);
+
+#endif
diff --git a/include/multiboot2.h b/include/multiboot2.h
new file mode 100644
index 0000000..f22fd8e
--- /dev/null
+++ b/include/multiboot2.h
@@ -0,0 +1,40 @@
+#ifndef MULTIBOOT2_H
+#define MULTIBOOT2_H
+
+#include <stdint.h>
+
+struct mb2_tag_header {
+	uint32_t type;
+	uint32_t size;
+} __attribute__((packed, aligned(8)));
+typedef struct mb2_tag_header mb2_tag_header;
+
+struct mb2_tag_fb {
+	uint32_t type;
+	uint32_t size;
+	uint64_t framebuffer_addr;
+	uint32_t framebuffer_pitch;
+	uint32_t framebuffer_width;
+	uint32_t framebuffer_height;
+	uint8_t framebuffer_bpp;
+	uint8_t framebuffer_type;
+} __attribute__((packed, aligned(8)));
+typedef struct mb2_tag_fb mb2_tag_fb;
+
+// multiboot2 magic check
+#define MB2_MAGIC		0x36D76289
+
+// multiboot2 tag
+#define MB2_TAG_END		0
+#define MB2_TAG_CMDLINE		1
+#define MB2_TAG_BOOTLOADER	2
+#define MB2_TAG_MODULES		3
+#define MB2_TAG_MEM		4
+#define MB2_TAG_BIOS		5
+#define MB2_TAG_MMAP		6
+#define MB2_TAG_VBE		7
+#define MB2_TAG_FB		8
+
+void init_fb(mb2_tag_header* multiboot_bootinfo, uint32_t multiboot_magic);
+
+#endif
-- 
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