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6136cbcb
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2020-09-23T21:31:05
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Metal: Implement transform feedback
- XFB is currently emulated by writing to storage buffers.
- Metal doesn't allow vertex shader to both write to storage buffers and
to stage output (i.e clip position). So if GL_RASTERIZER_DISCARD is
NOT enabled, the draw with XFB enabled will have 2 passes:
+ First pass: vertex shader writes to XFB buffers + not write to stage
output + disable rasterizer.
+ Second pass: vertex shader writes to stage output (i.e.
[[position]]) + enable rasterizer. If GL_RASTERIZER_DISCARD is
enabled, the second pass is omitted.
+ This effectively executes the same vertex shader twice. TODO:
possible improvement is writing vertex outputs to buffer in first
pass then re-use that buffer as input for second pass which has a
passthrough vertex shader.
- If GL_RASTERIZER_DISCARD is enabled, and XFB is enabled:
+ Only first pass above will be executed, and the render pass will use
an empty 1x1 texture attachment since rasterization is not needed.
- If GL_RASTERIZER_DISCARD is enabled, but XFB is NOT enabled:
+ we still enable Metal rasterizer.
+ but vertex shader must emulate the discard by writing gl_Position =
(-3, -3, -3, 1). This effectively moves the vertex out of clip
space's visible area.
+ This is because GLSL still allows vertex shader to write to stage
output when rasterizer is disabled. However, Metal doesn't allow
that. In Metal, if rasterizer is disabled, then vertex shader must
not write to stage output.
- See src/libANGLE/renderer/metal/doc/TransformFeedback.md for more
details.
Bug: angleproject:2634
Change-Id: I6c700e031052560326b7f660ee7597202d38e6aa
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2408594
Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>
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9277ee74
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2020-07-06T12:40:58
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Metal: Implement MSAA default framebuffer.
GL_SAMPLE_COVERAGE_VALUE is implemented by inserting gl_SampleMask
writing logic to fragment shader.
New test added: MultisampleTest.ContentPresevedAfterInterruption.
- Skip on D3D11 (Bug: angleproject:4609)
Bug: angleproject:2634
Change-Id: Ib44daf0baccc36ea320596d81713156047da059c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2281783
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
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4cef8a49
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2019-11-26T00:04:00
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Metal: Support depthRange near > far
Metal doesn't natively support near > far depthRange, need to
emulate it via shader.
Bug: angleproject:2634
Change-Id: I1885cad3467478a0dcc4b25b7d41f980b9e03103
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1919282
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
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a5a04ac0
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2019-10-29T22:57:55
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Metal backend pt3: shader translator
Implementation of GLSL to MSL translator
Bug: angleproject:2634
Change-Id: I66e2374b461548fac46163ea79790a488515e6b0
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1887251
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
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d200a77a
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2019-10-10T00:44:01
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Metal backend skeleton implementation.
Bug: angleproject:2634
Change-Id: I34be82f4a80a6851fecb53a51e069b134d82613a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1849079
Commit-Queue: Le Hoang Quyen <le.hoang.q@gmail.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
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