Commits · 5d64ec4c2dcd5dbeac89a1f5e50bb3d6619081cd · Chen Yisong / swiftshader

11 Apr, 2019 29 commits

authored Apr 10, 2019

Remove duplicate definitions of Extract and Insert for UInt4

Change-Id: Ib2d54606ead6b953b93f28e9f0dfd7987b1da774
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28848
Presubmit-Ready: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>

5d64ec4c

SpirvShader: Document ops requiring capabilities · 3954a0ba

authored Apr 10, 2019

... that will not be required for Pastel 1.0.

Bug: b/126873455
Change-Id: I024296dd39ae74613577bd5dbd8d75051b7f4f5c
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28790Tested-by: Ben Clayton <bclayton@google.com>
Presubmit-Ready: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

3954a0ba

SpirvShader: Implement GLSLstd450FindILsb · 3f007c4d

authored Apr 10, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.function.integer.findlsb.*
Change-Id: I46671fe6b64814a5c9cbc8dd9fe4cc449a328f42
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28789Tested-by: Ben Clayton <bclayton@google.com>
Presubmit-Ready: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

3f007c4d

SpirvShader: Implement GLSLstd450Find[U,S]Msb · 6095826b

authored Apr 10, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.function.integer.findMSB.*
Change-Id: I6337998f725334c31d8adeae05fc441bb3895908
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28788Tested-by: Ben Clayton <bclayton@google.com>
Presubmit-Ready: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

6095826b

SpirvShader: Implement GLSLstd450Determinant · 1fb633c3

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.matrix.determinant.*
Change-Id: I81ae56951b9fa2e1aedb327039160cf44f7f0a18
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28728Tested-by: Ben Clayton <bclayton@google.com>
Presubmit-Ready: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

1fb633c3

SpirvShader: Implement GLSLstd450NClamp · 4d63312f

authored Apr 09, 2019

Beware: the dEQP tests here are very weak - they do not seem to properly test the NaN handling of this instruction.

Bug: b/126873455
Tests: dEQP-VK.spirv_assembly.instruction.compute.opnclamp.all
Change-Id: I8d1f80f5536996ca46c30ee4895d9f6e2c29a03e
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28711Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

4d63312f

SpirvShader: Implement GLSLstd450NMax · 02de7e00

authored Apr 09, 2019

Beware: the dEQP tests here are very weak - they do not seem to properly test the NaN handling of this instruction.

Bug: b/126873455
Tests: dEQP-VK.spirv_assembly.instruction.compute.opnmax.all
Change-Id: Ibd704c9dc9c3475df10b02c0c0f80b9c3e472ff4
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28710Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

02de7e00

SpirvShader: Implement GLSLstd450NMin · ee10bcf1

authored Apr 09, 2019

Beware: the dEQP tests here are very weak - they do not seem to properly test the NaN handling of this instruction.

Bug: b/126873455
Tests: dEQP-VK.spirv_assembly.instruction.compute.opnmin.all
Change-Id: I5283af4a1e697b080f53193bc21ddd446b232d1e
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28709Reviewed-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

ee10bcf1

SpirvShader: Mark GLSLstd450IMix as unreachable. · 238fec3c

authored Apr 09, 2019

Was removed from the spec in version 0.99.

Bug: b/126873455
Change-Id: I93c60b7d1e8332e70f7116636384f4f85ea542cb
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28708Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

238fec3c

SpirvShader: Implement GLSLstd450InverseSqrt · 93451856

authored Apr 09, 2019

RcpSqrt_pp is not accurate enough to be used on non-relaxed precision types.

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.inversesqrt.*
Change-Id: I3e34d28dbd863c9cb14cf6c79afe08a1992b5478
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28697Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

93451856

SpirvShader: Handle DecorationRelaxedPrecision decorations · 8448cc5b

authored Apr 09, 2019

While not strictly necessary (we could always calculate with the highest precision), it is a tiny amount of work to dramatically increase performance of instructions like InverseSqrt for relaxed precision types.

Bug: b/126873455
Change-Id: I42d5871a8e0886001e85fd4e16f8e6cb309236cf
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28696Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

8448cc5b

SpirvShader: Implement GLSLstd450Sqrt · 6517ad2f

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.sqrt.*
Change-Id: Ia178618bb2777d9b58beef19d4e18767cc9a8f73
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28695Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

6517ad2f

SpirvShader: Implement GLSLstd450Log2 · e17acfe5

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.log2.*
Change-Id: I1a6a4e1fbf41ccd7aacf2fa7fbe8b8e7c6d28f3b
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28443Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

e17acfe5

SpirvShader: Implement GLSLstd450Exp2 · f40b56c4

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.exp2.*
Change-Id: I8a8f03a9dd1e30866b6f330c987d93bf4d95d265
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28442Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

f40b56c4

SpirvShader: Implement GLSLstd450Log · 2c1da722

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.log.*
Change-Id: I14cc590230dbbf4cfd24a0903bc2fbfb3c5a5192
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28441Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

2c1da722

SpirvShader: Implement GLSLstd450Exp · 242f002c

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.exp.*
Change-Id: I35a28475b56d820b6306782188d72a151845fe58
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28440Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

242f002c

SpirvShader: Implement GLSLstd450Pow · bfe94f02

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.pow.*
Change-Id: I74797e69adc78e4c06ec4a8b2923b78166afbc18
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28439Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

bfe94f02

SpirvShader: Implement GLSLstd450Atan2 · a520c3e2

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.atan2.*
Change-Id: I85596109069d3cee8ebd5f65770cb06ca7b93e53
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28438Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

a520c3e2

SpirvShader: Implement GLSLstd450Atanh · fa6a539a

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.atanh.*
Change-Id: Ie58753a4a0bdef18ec317129f2c4a7f0c0c314b4
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28694Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

fa6a539a

SpirvShader: Implement GLSLstd450Acosh · 28ebcb01

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.acosh.*
Change-Id: Id02fae0c7020ee83cb612f9370cdbb5c4dc31af1
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28693Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

28ebcb01

SpirvShader: Implement GLSLstd450Asinh · f6d77abc

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.asinh.*
Change-Id: I83b425bea2d693c5bcab3b1685252be0ba9fb023
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28692Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

f6d77abc

SpirvShader: Implement GLSLstd450Tanh · 3928bd94

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.tanh.*
Change-Id: If63f53b5d9d78dd4a2cd6c31c42cb16f03a48d98
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28691Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

3928bd94

SpirvShader: Implement GLSLstd450Cosh · 900ea2cb

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.cosh.*
Change-Id: I25b8d84bb8be76b816afade7c62e70fda2c926a0
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28690Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

900ea2cb

SpirvShader: Stub all the remaining GLSLstd450 unimplemented cases · 91fd0e2c

authored Apr 09, 2019

Help mitigate merge conflicts as two people will be working on this at the same time.

Change-Id: I92534eb1c92ec9ce66178d6d669a473350a0c158
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28689Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

91fd0e2c

SpirvShader: Implement GLSLstd450Sinh · d9636978

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.sinh.*
Change-Id: I59239dd0623260090ac662501bdefb2da273fd97
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28688Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

d9636978

SpirvShader: Implement GLSLstd450Atan · 749b4e0c

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.atan.*
Change-Id: Ic7dc89ca2b3253482e972ced46515fc83da33770
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28437Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

749b4e0c

SpirvShader: Implement GLSLstd450Acos · eafae477

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.acos.*
Change-Id: I7f65b398b6dc9ba5daf2df0a98c41b50b9775cd2
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28672Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

eafae477

SpirvShader: Implement GLSLstd450Asin · f9350d76

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.asin.*
Change-Id: Ifb1e6b5f54b27abfb4324f5d2246717400da639f
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28671Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

f9350d76

SpirvShader: Implement GLSLstd450Tan · 14740063

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.tan.*
Change-Id: I229b46b285075bd25272145a562135df08438160
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28670
Presubmit-Ready: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>

14740063

10 Apr, 2019 11 commits

SpirvShader: Implement GLSLstd450Cos · 1b6f8c7d

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.cos.*
Change-Id: I4b5fe36487f0832ad21f3e78df9ba133284cffbd
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28669Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

1b6f8c7d

SpirvShader: Implement GLSLstd450Sin · a2c8b778

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.sin.*
Change-Id: Iec96b2a235534fbc5b76c699a6b62679b75582ca
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28668Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

a2c8b778

SpirvShader: Implement GLSLstd450Degrees · 251bc28f

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.degrees.*
Change-Id: I4997c83f73a87957239e38fb14aef803b74ba911
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28650Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

251bc28f

SpirvShader: Implement GLSLstd450Radians · a15fcf44

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.radians.*
Change-Id: Iae78dac21165967d305a54157f60d95d13de5984
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28649Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

a15fcf44

SpirvShader: Implement GLSLstd450Ldexp · 20f6ba8b

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.function.common.ldexp.*
Change-Id: Ie8ab0db7a7f712c5f876f521773217be5f350e4f
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28648Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

20f6ba8b

SpirvShader: Implement GLSLstd450Fma · 6caf821a

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.function.common.fma.*
Change-Id: I00e890a6a051b45bc552944ec5364f070ee3a768
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28629Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

6caf821a

SpirvShader: Implement GLSLstd450Frexp · fc77af18

authored Apr 09, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.function.common.frexp.*
Change-Id: Ic725c53191c3a6ec6494859d6eb8e6a8eb77c90e
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28628Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

fc77af18

Implement pack/unpack extended instructions · 50e64936

authored Apr 08, 2019

- GLSLstd450PackSnorm4x8
- GLSLstd450PackUnorm4x8
- GLSLstd450PackSnorm2x16
- GLSLstd450PackUnorm2x16
- GLSLstd450PackHalf2x16
- GLSLstd450UnpackSnorm4x8
- GLSLstd450UnpackUnorm4x8
- GLSLstd450UnpackSnorm2x16
- GLSLstd450UnpackUnorm2x16
- GLSLstd450UnpackHalf2x16

Test: dEQP-VK.glsl.builtin.function.pack_unpack.*
Bug: b/126873455
Change-Id: I0c765bc215d43f894cad91c7ee06b5e3af3f75db
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28433Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

50e64936

SpirvShader: Implement GLSLStd450ModfStruct · fde26fe3

authored Apr 08, 2019

dEQP has no test coverage for this. Filed VK-GL-CTS #1728 to fix that.

Bug: b/126873455
Change-Id: I69524d0f4d5d15356eedd105645637af1a4f0f0f
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28608Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

fde26fe3

SpirvShader: Implement GLSLstd450Modf · 2cbf4f90

authored Apr 08, 2019

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.function.common.modf.*

Change-Id: Icefc1f7241aa1b3ef253b9f5775c38a424afec77
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28569
Presubmit-Ready: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>

2cbf4f90

Generic Transform Feedback buffer as global state · 3635a129

authored Apr 08, 2019

Moved the generic Transform Feedback buffer out of the local Transform
Feedback Object (TFO), and into global state.

Bug chromium:818098
Tests: dEQP-GLES3.functional.state_query.indexed.transform_feedback_switching_buffer
Change-id: Ife86cc82bd57c33b9daec4870610b5eaea5c2f52
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28436
Presubmit-Ready: Sean Risser <srisser@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Sean Risser <srisser@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

3635a129