Integer operations that overflow are defined to wrap in the ESSL
3.00.6 spec. Constant folding that happens inside the shader
translator should also follow the wrapping rules.

The new implementations of wrapping integer addition and subtraction
use unsigned integers to perform calculations. Unsigned integers are
defined to implement arithmetic in modulo 2^n in the C++ spec. This
behavior is also leveraged to implement wrapping unsigned integer
multiplication.

The implementation of wrapping signed integer multiplication is
slightly trickier. The operands are casted to a wider type to perform
the multiplication in a way that doesn't overflow, and then the result
is truncated and casted back to the narrower integer type.

Incorrect tests that expected errors to be generated from integer
overflow in constant folding are removed.

BUG=chromium:637050
TEST=angle_unittests

Change-Id: I0de7e25881d254803455fbf22907c192f49d09ff
Reviewed-on: https://chromium-review.googlesource.com/390252
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

Implements workarounds for:
 - The pack state making rows overlap in memory, which causes crashes on
   some drivers.
 - The driver adding an extra last row padding when checking if the
   pixel pack buffer is large enough for the readPixels.

BUG=angleproject:1512

Change-Id: I120ff58649bb523e8b01da6ef03d8fcadaf076b2
Reviewed-on: https://chromium-review.googlesource.com/388029
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>

BUG=angleproject:1386

Change-Id: I44da3a4cb2b23f98978349f26b80d6bb3a6dc8b5
Reviewed-on: https://chromium-review.googlesource.com/388784
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

ESSL has undefined behavior when the integer modulus operator is used
on negative operands. Generate a warning and fold the result to zero
in this case.

In case the minimum representable signed integer is divided by -1, the
result is defined to be either the maximum or minimum representable
value. We choose to fold the calculation to the maximum representable
value in this case.

BUG=angleproject:1537
TEST=angle_unittests

Change-Id: I57fac6b54a3553b7a0f0e36cc6ba0ed59a88eea9
Reviewed-on: https://chromium-review.googlesource.com/390251Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>

BUG=angleproject:1512

Change-Id: Ia6bac628c35f04bc5d3adfde1569902475519698
Reviewed-on: https://chromium-review.googlesource.com/387668
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

The code used to incorrectly assert that the right-hand side of shift
should have the same signedness as the left-hand side. Instead simply
assert that both the lhs and rhs are integer typed, and also don't
rely on aliasing via union when accessing bit shift operands.

Also disallow constant folded bit shifts where the right hand side is
greater than 31. Shifting with values greater than the width of the
type has undefined results in both ESSL and C++.

BUG=chromium:648135
TEST=angle_unittests

Change-Id: I84a99abc55f0eeda549b4781e954d17ba7b87552
Reviewed-on: https://chromium-review.googlesource.com/389351Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>

- Use full header paths in includes
- Use ASSERT instead of assert
- Use angle::NonCopyable instead of PP_DISALLOW_COPY_AND_ASSIGN
- Use range-for in a couple places
- Remove pp_utils.h

BUG=angleproject:1522

Change-Id: If107fef89e8465bca65cf664926d1051c5d1e232
Reviewed-on: https://chromium-review.googlesource.com/387212
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>

This will allow the OpenGL driver to reclaim GPU memory.

BUG=angleproject:1512

Change-Id: If063e1ff9f4a544012ca78c37e198054cb4edcac
Reviewed-on: https://chromium-review.googlesource.com/388771
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>

Fails on Win7 Release (AMD R7 240) bot

BUG=angleproject:1535

Change-Id: I5e8d0552867bfe0d81f3e189536c50b36f530089
Reviewed-on: https://chromium-review.googlesource.com/389233Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>

We would advertise ES3 in some cases when we didn't support it.

BUG=angleproject:1381
BUG=chromium:649101

Change-Id: I2a5bbc1d6153cdfc6c9c577aa0b82caf8482a42d
Reviewed-on: https://chromium-review.googlesource.com/388190
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

The ES3 spec and this extension lead to some awkward interactions. The
extension doesn't mention allowed filtering modes, so be default it
allows both linear and nearest. ES3 however, very clearly restricts
any depth texture (any texture with effective internal format which
has depth or stencil bits) to only use nearest filtering. This then
breaks compatibility with the legazy unsized formats.

Choose to be slightly non-conformant here, and allow linear filtering
for the older unsized formats. Although this could lead to problems
down the line, it is consistent with existing ES drivers in practice.

Other future options might be to override the behaviour of the filter
to use nearest when using WebGL validation compatibility.

BUG=chromium:649200

Change-Id: I4ee7608dd04d1fd238385aefee32c8c9c1e80ca0
Reviewed-on: https://chromium-review.googlesource.com/388759Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

Because 2D and external textures have the same HLSL texture type, they were
generating texture functions with the same name.  This causes conflicts when
both 2D and external textures are used in the same shader.

BUG=angleproject:1534
BUG=645532

Change-Id: I4b324014b7d9b4851d358730cf4e31fc8461584c
Reviewed-on: https://chromium-review.googlesource.com/388551Reviewed-by: Corentin Wallez <cwallez@chromium.org>

BUG=angleproject:1518

Change-Id: I662f7b07da5c97831496f2617b0adadf9858bdc9
Reviewed-on: https://chromium-review.googlesource.com/386799Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>

BUG=chromium:648135

Change-Id: I41581f63af650564a0f61c1baeeb38017c8513ed
Reviewed-on: https://chromium-review.googlesource.com/387470
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

BUG=angleproject:1512

Change-Id: Ifdb8d4c38e3c90e03eee42ba9fd6390dffd61363
Reviewed-on: https://chromium-review.googlesource.com/388611Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

BUG=angleproject:1522
BUG=chromium:648074

Change-Id: Ibf0858aaeb81933dd221ac82a49160169b48a495
Reviewed-on: https://chromium-review.googlesource.com/387211Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>

The validation for ReadPixels allows for two combations of format/type:
  1. Based on the current framebuffer's component type.
    * GL_RGBA/GL_UNSIGNED_BYTE if the framebuffer is a normalized (signed
      or unsigned).
    * GL_RGBA_INTEGER/GL_INTEGER if the framebuffer is an
      integer format.
    * GL_RGBA_INTEGER/GL_UNSIGNED_INTEGER if the framebuffer is an
      unsigned integer format.
    * GL_RGBA/GL_FLOAT if the framebuffer is any type of float
      framebuffer (added in EXT_color_buffer_float).
    * These combations are detailed in the ES2 spec on pg 105 or ES3 on pg
      193.
  2. The implementation read format/type returned from glGetIntegerv.
    * These formats are added by specs, OES_texture_float, EXT_texture_rg,
      EXT_read_format_bgra, etc.

Update the GL and D3D backends to perform the conversion from GL_HALF_FLOAT
to GL_HALF_FLOAT_OES.

Continue allowing reading as BGRA_EXT to support Skia.  Should be removed in
the future.

BUG=607283
BUG=angleproject:1478

Change-Id: I0312cad4d5f138ab036f383d221f8ccd19a77f6d
Reviewed-on: https://chromium-review.googlesource.com/346232
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

Using the same policy as for system memory storage, we release
the staging buffer if it has been unmodified for several uses.

We could further extend this technique to other storage buffers
using a nearly identical policy. We might need to mitigate the
cost of iterating over all the storages of all the buffers.

BUG=angleproject:516

Change-Id: Ib24ef03cf4184ef6f0c24f83347538df82de5f58
Reviewed-on: https://chromium-review.googlesource.com/387200Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

In preparation for making them robust.

BUG=chromium:648135

Change-Id: I88fc87d8887064fda04087c56de05d8725a6fe5f
Reviewed-on: https://chromium-review.googlesource.com/387469Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

BUG=chromium:648031
BUG=angleproject:1522

Change-Id: I825cea9e736a2c99133408249cfcd525431d31de
Reviewed-on: https://chromium-review.googlesource.com/386853
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>

Remove useTemporaryIndex() in function RewriteTexelFetchOffset since
no temporary variables will be created in this function.

BUG=angleproject:1469

Change-Id: Ibed56f0ba5c89b6ae1ab1611de39514c3fbb600f
Reviewed-on: https://chromium-review.googlesource.com/387198Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

When uploading textures from an unpack buffer, some drivers expect an
extra row paading, causing them to think the pixel buffer is not big enough.
We work around this by uploading the last row separately.

BUG=angleproject:1512

Change-Id: I52fb8b35dc450b957f1fafb0b405c81bf0504157
Reviewed-on: https://chromium-review.googlesource.com/385193
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

DrawBuffersTest.FirstAndLast/ES2_OPENGL
DrawBuffersTest.FirstHalfNULL/ES2_OPENGL
Hang on Win7 Release (ATI) and Win7 Debug (ATI) bots.

BUG=angleproject:1533

Change-Id: I6e37893fbcdbcc7a2a76c1cab6e8ef1f7ebaec19
Reviewed-on: https://chromium-review.googlesource.com/387714Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>

BUG=648063

Change-Id: Ia90d12c8cb4ae0a694227145267e78ca02dcc2b0
Reviewed-on: https://chromium-review.googlesource.com/387114
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

BUG=648063

Change-Id: I82d9fbdaf8791a396dd71eeb57d93967ba5d65bf
Reviewed-on: https://chromium-review.googlesource.com/387115Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

Since the CallDAG is needed to check for the call graph depth, its
creation code must be robust to very deep call graphs.

BUG=angleproject:1517

Change-Id: I753ab84ad4ced6363a212f0fe94a89aabf4e3c3e
Reviewed-on: https://chromium-review.googlesource.com/385496Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>

BUG=angleproject:1523

Change-Id: I6fecb5055ed8087665aeee34b3a066ea8f38d51b
Reviewed-on: https://chromium-review.googlesource.com/386281Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>

Fix base/numerics to not trigger upcoming Clang warning regarding
unsigned enum bitfields producing non-portable code.

For more details, see the patch here: https://reviews.llvm.org/D24289

BUG=648462

Change-Id: I9aaa01e99f734ff927b5b1171706b2f49b437d0b
Reviewed-on: https://chromium-review.googlesource.com/386887
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

On some Intel D3D drivers, evaluating unary minor operator on an
integer variable may get wrong answer in vertex shader.

This patch works around this bug by replacing -(int) with ~(int)+1
on Windows Intel.

BUG=chromium:644033

Change-Id: I0af719e84d618a33f25bcb33bde0c381fb462a31
Reviewed-on: https://chromium-review.googlesource.com/381675Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

Previously our multiplication and other operators could
do overflows, which can lead to security bugs.

BUG=chromium:637050

Change-Id: Icee22a87909e205b71bda1c5bc1627fcf5e26e90
Reviewed-on: https://chromium-review.googlesource.com/382678
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

It contains defines that need to be consistent between the header and
the implementation.

BUG=angleproject:1522
BUG=chromium:647807

Change-Id: Ica144c455b7366bd9939a07b171edffe5af8bf35
Reviewed-on: https://chromium-review.googlesource.com/386945
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

This allows us to not store std::pairs to identify SRVs. Instead
we can release the cached SRVs directly when we re-create the
native buffer.

BUG=angleproject:1513

Change-Id: I6f6d5edc659aa843c9439b97661073415f1a772b
Reviewed-on: https://chromium-review.googlesource.com/385818
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>

When we want to use GN standalone, the fuzzer_test template won't exist.
Instead make the fuzzer a source set that is used by a target in Chrome.

BUG=angleproject:1522

Change-Id: I347e633448d508eb124d0861b0fb28315923016c
Reviewed-on: https://chromium-review.googlesource.com/386636Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>

Change-Id: I442eac44212406b0fd9fb64b2e4e914bf61f8503
Reviewed-on: https://chromium-review.googlesource.com/386280Reviewed-by: Geoff Lang <geofflang@chromium.org>

A stray iostream got introduced in
28b6528c

BUG=angleproject:1522

Change-Id: Ib0b14b47d4786309ec2d39acb5531f3772b91f20
Reviewed-on: https://chromium-review.googlesource.com/386256Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>

This combination is not allowed by the formal grammar in the ESSL 3.00
spec, and should still be disallowed in ESSL 3.00 shaders even though
the shader parser now implements the more flexible ESSL 3.10 grammar.

BUG=angleproject:1507
TEST=angle_unittests

Change-Id: I766a468fd7314c7e60e020b5b204aa6950263633
Reviewed-on: https://chromium-review.googlesource.com/381933Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>

Now that ternary nodes are not represented by TIntermSelection any
more, TIntermIfElse is an easier name to understand for newcomers to
the code.

BUG=angleproject:1490
TEST=angle_unittests

Change-Id: Ia1e04e356ab93409400245092a84533d7dfd129d
Reviewed-on: https://chromium-review.googlesource.com/385416Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>

BUG=angleproject:1522

Change-Id: Idbe8194ba478366e99c7460d403d03fe27dd89d0
Reviewed-on: https://chromium-review.googlesource.com/353153
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

Condition calculation in for and while loops has bug on Intel Mac. Work
around it by converting "CONDITION" to "CONDITION && true".

This CL also adds previous SH_EMULATE_ABS_INT_FUNCTION workaround to
the ANGLE GL back-end on OSX

BUG=chromium:644669
TEST=deqp/functional/gles3/shaderloop_for/while.html

Change-Id: I910f662b054f259fcb601b9938841b3a2d066840
Reviewed-on: https://chromium-review.googlesource.com/381678Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Qiankun Miao <qiankun.miao@intel.com>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>

The intent was already to enable it but without glEnable(GL_DEBUG_OUTPUT)
the Linux NVIDIA driver doesn't output anything.

BUG=

Change-Id: Ia9a500c2e792ee7c4e2a7be60d478419eda617e1
Reviewed-on: https://chromium-review.googlesource.com/385278
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>