From 38c7b20475cb2c718b2d126acf07dd480c9b5038 Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Wed, 9 Sep 2015 18:30:03 -0400
Subject: pica: Add pica_types module and move float24 definition.

---
 src/video_core/pica_types.h | 124 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 src/video_core/pica_types.h

(limited to 'src/video_core/pica_types.h')

diff --git a/src/video_core/pica_types.h b/src/video_core/pica_types.h
new file mode 100644
index 000000000..de798aa81
--- /dev/null
+++ b/src/video_core/pica_types.h
@@ -0,0 +1,124 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_types.h"
+
+namespace Pica {
+
+struct float24 {
+    static float24 FromFloat32(float val) {
+        float24 ret;
+        ret.value = val;
+        return ret;
+    }
+
+    // 16 bit mantissa, 7 bit exponent, 1 bit sign
+    // TODO: No idea if this works as intended
+    static float24 FromRawFloat24(u32 hex) {
+        float24 ret;
+        if ((hex & 0xFFFFFF) == 0) {
+            ret.value = 0;
+        } else {
+            u32 mantissa = hex & 0xFFFF;
+            u32 exponent = (hex >> 16) & 0x7F;
+            u32 sign = hex >> 23;
+            ret.value = std::pow(2.0f, (float)exponent-63.0f) * (1.0f + mantissa * std::pow(2.0f, -16.f));
+            if (sign)
+                ret.value = -ret.value;
+        }
+        return ret;
+    }
+
+    static float24 Zero() {
+        return FromFloat32(0.f);
+    }
+
+    // Not recommended for anything but logging
+    float ToFloat32() const {
+        return value;
+    }
+
+    float24 operator * (const float24& flt) const {
+        if ((this->value == 0.f && !std::isnan(flt.value)) ||
+            (flt.value == 0.f && !std::isnan(this->value)))
+            // PICA gives 0 instead of NaN when multiplying by inf
+            return Zero();
+        return float24::FromFloat32(ToFloat32() * flt.ToFloat32());
+    }
+
+    float24 operator / (const float24& flt) const {
+        return float24::FromFloat32(ToFloat32() / flt.ToFloat32());
+    }
+
+    float24 operator + (const float24& flt) const {
+        return float24::FromFloat32(ToFloat32() + flt.ToFloat32());
+    }
+
+    float24 operator - (const float24& flt) const {
+        return float24::FromFloat32(ToFloat32() - flt.ToFloat32());
+    }
+
+    float24& operator *= (const float24& flt) {
+        if ((this->value == 0.f && !std::isnan(flt.value)) ||
+            (flt.value == 0.f && !std::isnan(this->value)))
+            // PICA gives 0 instead of NaN when multiplying by inf
+            *this = Zero();
+        else value *= flt.ToFloat32();
+        return *this;
+    }
+
+    float24& operator /= (const float24& flt) {
+        value /= flt.ToFloat32();
+        return *this;
+    }
+
+    float24& operator += (const float24& flt) {
+        value += flt.ToFloat32();
+        return *this;
+    }
+
+    float24& operator -= (const float24& flt) {
+        value -= flt.ToFloat32();
+        return *this;
+    }
+
+    float24 operator - () const {
+        return float24::FromFloat32(-ToFloat32());
+    }
+
+    bool operator < (const float24& flt) const {
+        return ToFloat32() < flt.ToFloat32();
+    }
+
+    bool operator > (const float24& flt) const {
+        return ToFloat32() > flt.ToFloat32();
+    }
+
+    bool operator >= (const float24& flt) const {
+        return ToFloat32() >= flt.ToFloat32();
+    }
+
+    bool operator <= (const float24& flt) const {
+        return ToFloat32() <= flt.ToFloat32();
+    }
+
+    bool operator == (const float24& flt) const {
+        return ToFloat32() == flt.ToFloat32();
+    }
+
+    bool operator != (const float24& flt) const {
+        return ToFloat32() != flt.ToFloat32();
+    }
+
+private:
+    // Stored as a regular float, merely for convenience
+    // TODO: Perform proper arithmetic on this!
+    float value;
+};
+
+static_assert(sizeof(float24) == sizeof(float), "Shader JIT assumes float24 is implemented as a 32-bit float");
+
+} // namespace Pica
-- 
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