The Tor Browser / file comparison
comparison: gfx/angle/src/libGLESv2/Float16ToFloat32.py
gfx/angle/src/libGLESv2/Float16ToFloat32.py
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:af98431cc9a6 |
|---|---|
| 1 # Copyright (c) 2012 The ANGLE Project Authors. All rights reserved. | |
| 2 # Use of this source code is governed by a BSD-style license that can be | |
| 3 # found in the LICENSE file. | |
| 4 # | |
| 5 | |
| 6 # This script generates a function that converts 16-bit precision floating | |
| 7 # point numbers to 32-bit. | |
| 8 # It is based on ftp://ftp.fox-toolkit.org/pub/fasthalffloatconversion.pdf. | |
| 9 | |
| 10 def convertMantissa(i): | |
| 11 if i == 0: | |
| 12 return 0 | |
| 13 elif i < 1024: | |
| 14 m = i << 13 | |
| 15 e = 0 | |
| 16 while not (m & 0x00800000): | |
| 17 e -= 0x00800000 | |
| 18 m = m << 1 | |
| 19 m &= ~0x00800000 | |
| 20 e += 0x38800000 | |
| 21 return m | e | |
| 22 else: | |
| 23 return 0x38000000 + ((i - 1024) << 13) | |
| 24 | |
| 25 def convertExponent(i): | |
| 26 if i == 0: | |
| 27 return 0 | |
| 28 elif i in range(1, 31): | |
| 29 return i << 23 | |
| 30 elif i == 31: | |
| 31 return 0x47800000 | |
| 32 elif i == 32: | |
| 33 return 0x80000000 | |
| 34 elif i in range(33, 63): | |
| 35 return 0x80000000 + ((i - 32) << 23) | |
| 36 else: | |
| 37 return 0xC7800000 | |
| 38 | |
| 39 def convertOffset(i): | |
| 40 if i == 0 or i == 32: | |
| 41 return 0 | |
| 42 else: | |
| 43 return 1024 | |
| 44 | |
| 45 print """// | |
| 46 // Copyright (c) 2012 The ANGLE Project Authors. All rights reserved. | |
| 47 // Use of this source code is governed by a BSD-style license that can be | |
| 48 // found in the LICENSE file. | |
| 49 // | |
| 50 | |
| 51 // This file is automatically generated. | |
| 52 | |
| 53 namespace gl | |
| 54 { | |
| 55 """ | |
| 56 | |
| 57 print "const static unsigned g_mantissa[2048] = {" | |
| 58 for i in range(0, 2048): | |
| 59 print " %#010x," % convertMantissa(i) | |
| 60 print "};\n" | |
| 61 | |
| 62 print "const static unsigned g_exponent[64] = {" | |
| 63 for i in range(0, 64): | |
| 64 print " %#010x," % convertExponent(i) | |
| 65 print "};\n" | |
| 66 | |
| 67 print "const static unsigned g_offset[64] = {" | |
| 68 for i in range(0, 64): | |
| 69 print " %#010x," % convertOffset(i) | |
| 70 print "};\n" | |
| 71 | |
| 72 print """float float16ToFloat32(unsigned short h) | |
| 73 { | |
| 74 unsigned i32 = g_mantissa[g_offset[h >> 10] + (h & 0x3ff)] + g_exponent[h >> 10]; | |
| 75 return *(float*) &i32; | |
| 76 } | |
| 77 } | |
| 78 """ |
