third_party/qcms/src/halffloat.h - Issue 1206353002: [qcms] Make half float code self-contained: add halffloat.h

Unified Diff: third_party/qcms/src/halffloat.h

Issue 1206353002: [qcms] Make half float code self-contained: add halffloat.h (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: Created 5 years, 6 months ago

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Index: third_party/qcms/src/halffloat.h

diff --git a/third_party/qcms/src/halffloat.h b/third_party/qcms/src/halffloat.h

new file mode 100644

index 0000000000000000000000000000000000000000..35c725066b615f38c143d710b0d736a388c75660

--- /dev/null

+++ b/third_party/qcms/src/halffloat.h

@@ -0,0 +1,106 @@

+/* vim: set ts=8 sw=8 noexpandtab: */

+// qcms

+//

+// Permission is hereby granted, free of charge, to any person obtaining

+// a copy of this software and associated documentation files (the "Software"),

+// to deal in the Software without restriction, including without limitation

+// the rights to use, copy, modify, merge, publish, distribute, sublicense,

+// and/or sell copies of the Software, and to permit persons to whom the Software

+// is furnished to do so, subject to the following conditions:

+//

+// The above copyright notice and this permission notice shall be included in

+// all copies or substantial portions of the Software.

+//

+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO

+// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE

+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

+#ifndef _QCMS_HALFFLOAT_H

+#define _QCMS_HALFFLOAT_H

+const unsigned short qcms_half_float_base_table[512] = {

+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

+ 0, 0, 0, 0, 0, 0, 0, 1, 2, 4, 8, 16, 32, 64, 128, 256,

+ 512, 1024, 2048, 3072, 4096, 5120, 6144, 7168, 8192, 9216, 10240, 11264, 12288, 13312, 14336, 15360,

+ 16384, 17408, 18432, 19456, 20480, 21504, 22528, 23552, 24576, 25600, 26624, 27648, 28672, 29696, 30720, 31744,

+ 31744, 31744, 31744, 31744, 31744, 31744, 31744, 31744, 31744, 31744, 31744, 31744, 31744, 31744, 31744, 31744,

+ 32768, 32768, 32768, 32768, 32768, 32768, 32768, 32768, 32768, 32768, 32768, 32768, 32768, 32768, 32768, 32768,

+ 32768, 32768, 32768, 32768, 32768, 32768, 32768, 32769, 32770, 32772, 32776, 32784, 32800, 32832, 32896, 33024,

+ 33280, 33792, 34816, 35840, 36864, 37888, 38912, 39936, 40960, 41984, 43008, 44032, 45056, 46080, 47104, 48128,

+ 49152, 50176, 51200, 52224, 53248, 54272, 55296, 56320, 57344, 58368, 59392, 60416, 61440, 62464, 63488, 64512,

+ 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512,

+ 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512, 64512

+};

+const unsigned char qcms_half_float_shift_table[512] = {

+ 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,

+ 24, 24, 24, 24, 24, 24, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15,

+ 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,

+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 24,

+ 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,

+ 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 13,

+ 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,

+ 24, 24, 24, 24, 24, 24, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15,

+ 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,

+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 24,

+ 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,

+ 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 13

+};

+static inline unsigned short float_to_half_float(float f)

+ // See Blink::Source/platform/graphics/gpu/WebGLImageConversion.cpp::convertFloatToHalfFloat() and http://crbug.com/491784

+ unsigned temp = *((unsigned *)(&f));

+ unsigned signexp = (temp >> 23) & 0x1ff;

+ return qcms_half_float_base_table[signexp] + ((temp & 0x007fffff) >> qcms_half_float_shift_table[signexp]);

+#endif

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