From 318095f9b9d1825a704591ba57f668b2d55c243d Mon Sep 17 00:00:00 2001
From: Tobias <thm.frey@gmail.com>
Date: Sun, 9 Jun 2019 16:03:22 +0200
Subject: [PATCH] Port yuzu-emu/yuzu#2249: "ipc_helpers: Allow pushing and
 popping floating-point values" (#4702)

Certain values that are passed through the IPC buffer are actually
floating point values, not solely integral values.
---
 src/core/hle/ipc_helpers.h       | 30 ++++++++++++++++++++++++++++++
 src/core/hle/service/hid/hid.cpp |  2 +-
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/src/core/hle/ipc_helpers.h b/src/core/hle/ipc_helpers.h
index 01282a69b0..8176f0bbb6 100644
--- a/src/core/hle/ipc_helpers.h
+++ b/src/core/hle/ipc_helpers.h
@@ -141,6 +141,20 @@ inline void RequestBuilder::Push(u64 value) {
     Push(static_cast<u32>(value >> 32));
 }
 
+template <>
+inline void RequestBuilder::Push(f32 value) {
+    u32 integral;
+    std::memcpy(&integral, &value, sizeof(u32));
+    Push(integral);
+}
+
+template <>
+inline void RequestBuilder::Push(f64 value) {
+    u64 integral;
+    std::memcpy(&integral, &value, sizeof(u64));
+    Push(integral);
+}
+
 template <>
 inline void RequestBuilder::Push(bool value) {
     Push(static_cast<u8>(value));
@@ -341,6 +355,22 @@ inline s32 RequestParser::Pop() {
     return data;
 }
 
+template <>
+inline f32 RequestParser::Pop() {
+    const u32 value = Pop<u32>();
+    float real;
+    std::memcpy(&real, &value, sizeof(real));
+    return real;
+}
+
+template <>
+inline f64 RequestParser::Pop() {
+    const u64 value = Pop<u64>();
+    f64 real;
+    std::memcpy(&real, &value, sizeof(real));
+    return real;
+}
+
 template <>
 inline bool RequestParser::Pop() {
     return Pop<u8>() != 0;
diff --git a/src/core/hle/service/hid/hid.cpp b/src/core/hle/service/hid/hid.cpp
index ad63ab7a26..667ee12c4d 100644
--- a/src/core/hle/service/hid/hid.cpp
+++ b/src/core/hle/service/hid/hid.cpp
@@ -331,7 +331,7 @@ void Module::Interface::GetGyroscopeLowRawToDpsCoefficient(Kernel::HLERequestCon
 
     IPC::RequestBuilder rb = rp.MakeBuilder(2, 0);
     rb.Push(RESULT_SUCCESS);
-    rb.PushRaw<f32>(gyroscope_coef);
+    rb.Push(gyroscope_coef);
 }
 
 void Module::Interface::GetGyroscopeLowCalibrateParam(Kernel::HLERequestContext& ctx) {