VR: Soften the floor grid

VR: Soften the floor grid

- The grid is now drawn in the fragment shader instead of calling DrawLines.
- A single quad is used for the floor, mixing the background and the grid itself in a single shader.
- The geometry simplifies from a set of lines to a single quad.
- The precision for gradient shaders was set to low to reduce stress in the GPU.

BUG=728146
Presubmit doesn't like float casts in the shader code, which it thinks is c++ when it isn't.
NOPRESUBMIT=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2907203002
Cr-Original-Commit-Position: refs/heads/master@{#475935}
Review-Url: https://codereview.chromium.org/2915143002
Cr-Commit-Position: refs/branch-heads/3112@{#98}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed: https://chromium.googlesource.com/chromium/src/+/2cf486993e67211dd0a470bd86f4c3eec1234df4

[acondor_, 2017-06-01 18:03:03]

acondor@google.com changed reviewers:
+ mthiesse@chromium.org

[acondor_, 2017-06-01 18:03:04]

PTAL

[mthiesse, 2017-06-01 18:03:25]

lgtm

[mthiesse, 2017-06-01 18:03:35]

The CQ bit was checked by mthiesse@chromium.org

[commit-bot: I haz the power, 2017-06-01 18:04:06]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-06-01 18:04:06]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-06-01 18:04:07]

CLs for remote refs other than refs/heads/master must contain NOTRY=true and
NOPRESUBMIT=true in order for the CQ to process them

[mthiesse, 2017-06-01 18:05:46]

Description was changed from

==========
VR: Soften the floor grid

- The grid is now drawn in the fragment shader instead of calling DrawLines.
- A single quad is used for the floor, mixing the background and the grid itself
in a single shader.
- The geometry simplifies from a set of lines to a single quad.
- The precision for gradient shaders was set to low to reduce stress in the GPU.

BUG=728146
 Presubmit doesn't like float casts in the shader code, which it thinks is c++
when it isn't.
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2907203002
Cr-Commit-Position: refs/heads/master@{#475935}
(cherry picked from commit 5d5052f3e33d06bf1f6710a8e1a94fd972e9c83e)
==========

to

==========
VR: Soften the floor grid

- The grid is now drawn in the fragment shader instead of calling DrawLines.
- A single quad is used for the floor, mixing the background and the grid itself
in a single shader.
- The geometry simplifies from a set of lines to a single quad.
- The precision for gradient shaders was set to low to reduce stress in the GPU.

BUG=728146
 Presubmit doesn't like float casts in the shader code, which it thinks is c++
when it isn't.
NOPRESUBMIT=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2907203002
Cr-Commit-Position: refs/heads/master@{#475935}
(cherry picked from commit 5d5052f3e33d06bf1f6710a8e1a94fd972e9c83e)
==========

[mthiesse, 2017-06-01 18:05:51]

The CQ bit was checked by mthiesse@chromium.org

[commit-bot: I haz the power, 2017-06-01 18:06:45]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-06-01 18:07:13]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1496340351551230, "parent_rev":
"8fa06d4080e85f301966dec124bcab380f65bc83", "commit_rev":
"2cf486993e67211dd0a470bd86f4c3eec1234df4"}

[commit-bot: I haz the power, 2017-06-01 18:07:23]

Description was changed from

==========
VR: Soften the floor grid

- The grid is now drawn in the fragment shader instead of calling DrawLines.
- A single quad is used for the floor, mixing the background and the grid itself
in a single shader.
- The geometry simplifies from a set of lines to a single quad.
- The precision for gradient shaders was set to low to reduce stress in the GPU.

BUG=728146
 Presubmit doesn't like float casts in the shader code, which it thinks is c++
when it isn't.
NOPRESUBMIT=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2907203002
Cr-Commit-Position: refs/heads/master@{#475935}
(cherry picked from commit 5d5052f3e33d06bf1f6710a8e1a94fd972e9c83e)
==========

to

==========
VR: Soften the floor grid

- The grid is now drawn in the fragment shader instead of calling DrawLines.
- A single quad is used for the floor, mixing the background and the grid itself
in a single shader.
- The geometry simplifies from a set of lines to a single quad.
- The precision for gradient shaders was set to low to reduce stress in the GPU.

BUG=728146
 Presubmit doesn't like float casts in the shader code, which it thinks is c++
when it isn't.
NOPRESUBMIT=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2907203002
Cr-Original-Commit-Position: refs/heads/master@{#475935}
Review-Url: https://codereview.chromium.org/2915143002
Cr-Commit-Position: refs/branch-heads/3112@{#98}
Cr-Branched-From:
b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed:
https://chromium.googlesource.com/chromium/src/+/2cf486993e67211dd0a470bd86f4...
==========

[commit-bot: I haz the power, 2017-06-01 18:07:24]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/2cf486993e67211dd0a470bd86f4...