From 82cb7917e40aaae552fb68ba27cc60f9eb56602f Mon Sep 17 00:00:00 2001
From: WerWolv <werwolv98@gmail.com>
Date: Wed, 1 Sep 2021 00:23:45 +0200
Subject: [PATCH] ui: Added half floats to data inspector

---
 .../builtin/source/content/data_inspector.cpp |  5 +++
 plugins/builtin/source/lang/de_DE.cpp         |  1 +
 plugins/builtin/source/lang/en_US.cpp         |  1 +
 plugins/builtin/source/lang/it_IT.cpp         |  1 +
 .../libimhex/include/hex/helpers/utils.hpp    |  2 ++
 plugins/libimhex/source/helpers/utils.cpp     | 34 +++++++++++++++++++
 6 files changed, 44 insertions(+)

diff --git a/plugins/builtin/source/content/data_inspector.cpp b/plugins/builtin/source/content/data_inspector.cpp
index 3f4baff76..0cc96fb6f 100644
--- a/plugins/builtin/source/content/data_inspector.cpp
+++ b/plugins/builtin/source/content/data_inspector.cpp
@@ -82,6 +82,11 @@ namespace hex::plugin::builtin {
             return [value] { ImGui::TextUnformatted(value.c_str()); return value; };
         });
 
+        ContentRegistry::DataInspector::add("hex.builtin.inspector.float16", sizeof(u16), [](auto buffer, auto endian, auto style) {
+            auto value = hex::format("{0:G}", hex::changeEndianess(float16ToFloat32(*reinterpret_cast<u16*>(buffer.data())), endian));
+            return [value] { ImGui::TextUnformatted(value.c_str()); return value; };
+        });
+
         ContentRegistry::DataInspector::add("hex.builtin.inspector.float", sizeof(float), [](auto buffer, auto endian, auto style) {
             auto value = hex::format("{0:G}", hex::changeEndianess(*reinterpret_cast<float*>(buffer.data()), endian));
             return [value] { ImGui::TextUnformatted(value.c_str()); return value; };
diff --git a/plugins/builtin/source/lang/de_DE.cpp b/plugins/builtin/source/lang/de_DE.cpp
index 5d7901e11..2ed45ded5 100644
--- a/plugins/builtin/source/lang/de_DE.cpp
+++ b/plugins/builtin/source/lang/de_DE.cpp
@@ -313,6 +313,7 @@ namespace hex::plugin::builtin {
                 { "hex.builtin.inspector.s32", "int32_t" },
                 { "hex.builtin.inspector.u64", "uint64_t" },
                 { "hex.builtin.inspector.s64", "int64_t" },
+                { "hex.builtin.inspector.float16", "half float (16 bit)" },
                 { "hex.builtin.inspector.float", "float (32 bit)" },
                 { "hex.builtin.inspector.double", "double (64 bit)" },
                 { "hex.builtin.inspector.ascii", "ASCII Zeichen" },
diff --git a/plugins/builtin/source/lang/en_US.cpp b/plugins/builtin/source/lang/en_US.cpp
index 7a1fc6f6d..3ce90c7f4 100644
--- a/plugins/builtin/source/lang/en_US.cpp
+++ b/plugins/builtin/source/lang/en_US.cpp
@@ -313,6 +313,7 @@ namespace hex::plugin::builtin {
                 { "hex.builtin.inspector.s32", "int32_t" },
                 { "hex.builtin.inspector.u64", "uint64_t" },
                 { "hex.builtin.inspector.s64", "int64_t" },
+                { "hex.builtin.inspector.float16", "half float (16 bit)" },
                 { "hex.builtin.inspector.float", "float (32 bit)" },
                 { "hex.builtin.inspector.double", "double (64 bit)" },
                 { "hex.builtin.inspector.ascii", "ASCII Character" },
diff --git a/plugins/builtin/source/lang/it_IT.cpp b/plugins/builtin/source/lang/it_IT.cpp
index 6c1bf0649..ee9d6e6da 100644
--- a/plugins/builtin/source/lang/it_IT.cpp
+++ b/plugins/builtin/source/lang/it_IT.cpp
@@ -312,6 +312,7 @@ namespace hex::plugin::builtin {
                 { "hex.builtin.inspector.s32", "int32_t" },
                 { "hex.builtin.inspector.u64", "uint64_t" },
                 { "hex.builtin.inspector.s64", "int64_t" },
+                { "hex.builtin.inspector.float16", "half float (16 bit)" },
                 { "hex.builtin.inspector.float", "float (32 bit)" },
                 { "hex.builtin.inspector.double", "double (64 bit)" },
                 { "hex.builtin.inspector.ascii", "ASCII Character" },
diff --git a/plugins/libimhex/include/hex/helpers/utils.hpp b/plugins/libimhex/include/hex/helpers/utils.hpp
index 9e5fc9f9b..835fecab6 100644
--- a/plugins/libimhex/include/hex/helpers/utils.hpp
+++ b/plugins/libimhex/include/hex/helpers/utils.hpp
@@ -179,6 +179,8 @@ namespace hex {
 
     void openFileBrowser(std::string_view title, DialogMode mode, const std::vector<nfdfilteritem_t> &validExtensions, const std::function<void(std::string)> &callback);
 
+    float float16ToFloat32(u16 float16);
+
     namespace scope_guard {
 
         #define SCOPE_GUARD ::hex::scope_guard::ScopeGuardOnExit() + [&]()
diff --git a/plugins/libimhex/source/helpers/utils.cpp b/plugins/libimhex/source/helpers/utils.cpp
index e6db56bc5..cff4e43b9 100644
--- a/plugins/libimhex/source/helpers/utils.cpp
+++ b/plugins/libimhex/source/helpers/utils.cpp
@@ -325,4 +325,38 @@ namespace hex {
         NFD::Quit();
     }
 
+    float float16ToFloat32(u16 float16) {
+        u32 sign = float16 >> 15;
+        u32 exponent = (float16 >> 10) & 0x1F;
+        u32 mantissa = float16 & 0x3FF;
+
+        u32 result;
+
+        if (exponent == 0) {
+            if (mantissa == 0) {
+                // +- Zero
+                result = sign << 31;
+            } else {
+                // Subnormal value
+                exponent = 0x7F - 14;
+
+                while ((mantissa & (1 << 10)) == 0) {
+                    exponent--;
+                    mantissa <<= 1;
+                }
+
+                mantissa &= 0x3FF;
+                result = (sign << 31) | (exponent << 23) | (mantissa << 13);
+            }
+        } else if (exponent == 0x1F) {
+            // +-Inf or +-NaN
+            result = (sign << 31) | (0xFF << 23) | (mantissa << 13);
+        } else {
+            // Normal value
+            result = (sign << 31) | ((exponent + (0x7F - 15)) << 23) | (mantissa << 13);
+        }
+
+        return reinterpret_cast<float&>(result);
+    }
+
 }
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