rename gpu_senquack to gpu_unai

[pcsx_rearmed.git] / plugins / gpu_unai / gpu_fixedpoint.h

diff --git a/plugins/gpu_unai/gpu_fixedpoint.h b/plugins/gpu_unai/gpu_fixedpoint.h
new file mode 100644 (file)
index 0000000..5df42cf
--- /dev/null
+++ b/plugins/gpu_unai/gpu_fixedpoint.h
@@ -0,0 +1,134 @@
+/***************************************************************************
+ *   Copyright (C) 2010 PCSX4ALL Team                                      *
+ *   Copyright (C) 2010 Unai                                               *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA.           *
+ ***************************************************************************/
+
+#ifndef FIXED_H
+#define FIXED_H
+
+typedef s32 fixed;
+
+//senquack - The gpu_drhell poly routines I adapted use 22.10 fixed point,
+//           while original Unai used 16.16: (see README_senquack.txt)
+//#define FIXED_BITS 16
+#define FIXED_BITS 10
+
+#define fixed_ZERO ((fixed)0)
+#define fixed_ONE  ((fixed)1<<FIXED_BITS)
+#define fixed_TWO  ((fixed)2<<FIXED_BITS)
+#define fixed_HALF ((fixed)((1<<FIXED_BITS)>>1))
+
+#define fixed_LOMASK ((fixed)((1<<FIXED_BITS)-1))
+#define fixed_HIMASK ((fixed)(~fixed_LOMASK))
+
+// int<->fixed conversions:
+#define i2x(x) ((x)<<FIXED_BITS)
+#define x2i(x) ((x)>>FIXED_BITS)
+
+INLINE fixed FixedCeil(const fixed x)
+{
+       return (x + (fixed_ONE - 1)) & fixed_HIMASK;
+}
+
+INLINE s32 FixedCeilToInt(const fixed x)
+{
+       return (x + (fixed_ONE - 1)) >> FIXED_BITS;
+}
+
+//senquack - float<->fixed conversions:
+#define f2x(x) ((s32)((x) * (float)(1<<FIXED_BITS)))
+#define x2f(x) ((float)(x) / (float)(1<<FIXED_BITS))
+
+//senquack - floating point reciprocal:
+//NOTE: These assume x is always != 0 !!!
+#ifdef GPU_UNAI_USE_FLOATMATH
+#if defined(_MIPS_ARCH_MIPS32R2) || (__mips == 64)
+INLINE float FloatInv(const float x)
+{
+       float res;
+       asm("recip.s %0,%1" : "=f" (res) : "f" (x));
+       return res;
+}
+#else
+INLINE float FloatInv(const float x)
+{
+       return (1.0f / x);
+}
+#endif
+#endif
+
+///////////////////////////////////////////////////////////////////////////
+// --- BEGIN INVERSE APPROXIMATION SECTION ---
+///////////////////////////////////////////////////////////////////////////
+#ifdef GPU_UNAI_USE_INT_DIV_MULTINV
+
+//  big precision inverse table.
+#define TABLE_BITS 16
+s32 s_invTable[(1<<TABLE_BITS)];
+
+//senquack - MIPS32 happens to have same instruction/format:
+#if defined(__arm__) || (__mips == 32)
+INLINE u32 Log2(u32 x) { u32 res; asm("clz %0,%1" : "=r" (res) : "r" (x)); return 32-res; }
+#else
+INLINE u32 Log2(u32 x) { u32 i = 0; for ( ; x > 0; ++i, x >>= 1); return i - 1; }
+#endif
+
+INLINE  void  xInv (const fixed _b, s32& iFactor_, s32& iShift_)
+{
+  u32 uD = (_b<0) ? -_b : _b;
+  if(uD>1)
+  {
+       u32 uLog = Log2(uD);
+    uLog = uLog>(TABLE_BITS-1) ? uLog-(TABLE_BITS-1) : 0;
+    u32 uDen = (uD>>uLog);
+    iFactor_ = s_invTable[uDen];
+    iFactor_ = (_b<0) ? -iFactor_ :iFactor_;
+    //senquack - Adapted to 22.10 fixed point (originally 16.16):
+    //iShift_  = 15+uLog;
+    iShift_  = 21+uLog;
+  }
+  else
+  {
+    iFactor_=_b;
+    iShift_ = 0;
+  }
+}
+
+INLINE  fixed xInvMulx  (const fixed _a, const s32 _iFact, const s32 _iShift)
+{
+       #ifdef __arm__
+               s64 res;
+               asm ("smull %Q0, %R0, %1, %2" : "=&r" (res) : "r"(_a) , "r"(_iFact));
+               return fixed(res>>_iShift);
+       #else
+               return fixed( ((s64)(_a)*(s64)(_iFact))>>(_iShift) );
+       #endif
+}
+
+INLINE  fixed xLoDivx   (const fixed _a, const fixed _b)
+{
+  s32 iFact, iShift;
+  xInv(_b, iFact, iShift);
+  return xInvMulx(_a, iFact, iShift);
+}
+#endif // GPU_UNAI_USE_INT_DIV_MULTINV
+///////////////////////////////////////////////////////////////////////////
+// --- END INVERSE APPROXIMATION SECTION ---
+///////////////////////////////////////////////////////////////////////////
+
+#endif  //FIXED_H