From e60fa7740cd7d245d1b22a25fea9df0768d32668 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji@benjidial.net>
Date: Sun, 19 May 2024 04:34:40 -0400
Subject: mouse support (working in qemu, semi-working in virtualbox)

---
 euler/include/euler/syscall.hpp | 15 ++++++++++++++-
 euler/source/euler/syscall.asm  | 28 ++++++++++++++++++++++++++--
 2 files changed, 40 insertions(+), 3 deletions(-)

(limited to 'euler')

diff --git a/euler/include/euler/syscall.hpp b/euler/include/euler/syscall.hpp
index 9255642..761dbcc 100644
--- a/euler/include/euler/syscall.hpp
+++ b/euler/include/euler/syscall.hpp
@@ -58,4 +58,17 @@ extern "C" uint32_t *__euler_get_framebuffer(
 
 extern "C" uint32_t __euler_encode_color(uint8_t r, uint8_t g, uint8_t b);
 
-extern "C" uint32_t __euler_read_key_packet();
+enum __euler_mouse_buttons : uint8_t {
+  __EULER_MB_LEFT = 1,
+  __EULER_MB_RIGHT = 2,
+  __EULER_MB_MIDDLE = 4
+};
+
+enum __euler_input_packet_type : uint8_t {
+  __EULER_IPT_MOUSE = 1,
+  __EULER_IPT_KEYBOARD = 2
+};
+
+extern "C" __euler_input_packet_type __euler_get_input_packet(
+  __euler_mouse_buttons &buttons_out, int16_t &x_change_out,
+  int16_t &y_change_out, uint32_t &keyboard_packet_out);
diff --git a/euler/source/euler/syscall.asm b/euler/source/euler/syscall.asm
index 34f2735..41bd05c 100644
--- a/euler/source/euler/syscall.asm
+++ b/euler/source/euler/syscall.asm
@@ -11,7 +11,7 @@ global __euler_end_this_thread
 global __euler_read_from_stream
 global __euler_get_framebuffer
 global __euler_encode_color
-global __euler_read_key_packet
+global __euler_get_input_packet
 
 section .text
 
@@ -96,7 +96,31 @@ __euler_encode_color:
   syscall
   ret
 
-__euler_read_key_packet:
+__euler_get_input_packet:
+  push rdi
+  push rsi
+  push rdx
+  push rcx
   mov rax, 5
   syscall
+
+  test al, 0x80
+  jnz .mouse_packet
+
+  pop rcx
+  mov dword [rcx], edi
+  add rsp, 24
+  mov al, 2
+  ret
+
+.mouse_packet:
+  add rsp, 8
+  pop rdx
+  mov word [rdx], si
+  pop rdx
+  mov word [rdx], di
+  pop rdx
+  and al, 0x7f
+  mov byte [rdx], al
+  mov al, 1
   ret
-- 
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