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Add support to NaN in Float32ToFloat16

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This will be used to test NaN is correctly sampled from float16
textures.

BUG=dawn:128

Change-Id: I6e3b79f438e9a48c3a167ab45baf9f9d019ce48b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/8361
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
This commit is contained in:
Corentin Wallez
2019-06-26 20:26:13 +00:00
committed by Commit Bot service account
parent 7ac0815347
commit 77aa5b59aa
2 changed files with 21 additions and 2 deletions
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6
src/common/Math.cpp
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@@ -85,8 +85,10 @@ uint16_t Float32ToFloat16(float fp32) {
uint32_t sign16 = (fp32i & 0x80000000) >> 16;
uint32_t mantissaAndExponent = fp32i & 0x7FFFFFFF;
if (mantissaAndExponent > 0x47FFEFFF) { // Infinity
return static_cast<uint16_t>(sign16 | 0x7FFF);
if (mantissaAndExponent > 0x7F800000) { // NaN
return 0x7FFF;
} else if (mantissaAndExponent > 0x47FFEFFF) { // Infinity
return static_cast<uint16_t>(sign16 | 0x7C00);
} else if (mantissaAndExponent < 0x38800000) { // Denormal
uint32_t mantissa = (mantissaAndExponent & 0x007FFFFF) | 0x00800000;
int32_t exponent = 113 - (mantissaAndExponent >> 23);