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Hash : 9b5fff82
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Date : 2022-10-05T21:56:00

Vulkan: Emulate shader stencil export for MSRTT

The MSRTT emulation code had one corner case issue that could lead to
performance and memory inefficiencies.  That is when stencil needs to be
unresolved and VK_EXT_shader_stencil_export is not supported.

This change adds a path to emulate VK_EXT_shader_stencil_export and
removes this inefficiency.

This should help Chromium on older Android devices that lack both this
and the recent VK_EXT_multisampled_render_to_single_sampled extensions.
Chromium frequently breaks the render pass (crbug.com/1336981), which
easily leads to this situation.

Bug: angleproject:4836
Change-Id: Ifceec43f7f3807b7e32f4b379edcd4351ae76414
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3935892
Reviewed-by: Yuxin Hu <yuxinhu@google.com>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Charlie Lao <cclao@google.com>

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Git HTTP	https://git.kmx.io/kc3-lang/angle.git
Git SSH	git@git.kmx.io:kc3-lang/angle.git
Public access ?	public
Description	A conformant OpenGL ES implementation for Windows, Mac, Linux, iOS and Android. Homepage Github
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README.md
Shader Variations

To build multiple variations of a shader, add a file named X.json corresponding to shader file X. A variation is generated by building the shader with different definitions (a la glslang_validator’s -DName=1). These definitions come from flags and enumerations defined in the json file. Without a .json file, the shader is generated as is (1 variation).

There are multiple possible fields in the json file:
- “Description”: This contains the license and other comments, which will be ignored.
- “Flags”: this is a list of flags. Each flag FLAG defines a shader variation with or without the define FLAG=1.
- other: any other field is a similar list to flags, except that each entry in this enumeration is a variation. Similar to “flags”, every entry ENTRY results in an ENTRY=1 define.
Flags are shorthand for 2-entry enumerations. Given n flags, there are 2^n variations where every flag is either present or not. For enumerations, only one entry is active in any variation. Thus, an enumeration with n entries generates n variations.

Example

Here is an example json file:

{
```
"Description": [
    "Copyright 2018 The ANGLE Project Authors. All rights reserved.",
    "Use of this source code is governed by a BSD-style license that can be",
    "found in the LICENSE file.",
    "",
    "RayTrace.comp.json: Build parameters for RayTrace.comp."
],
"Flags": [
    "NanFilter",
    "WorkaroundIntelBug"
],
"RayTraceQuality": [
    "IsRTLowRes",
    "IsRTHighRes",
    "IsRTAwesome"
],
"ImageType": [
    "IsR",
    "IsRG",
    "IsRGB",
    "IsRGBA"
]
```
}

This will generate 2^2 3 4 shaders.

kc3-lang/angle/src/libANGLE/renderer/vulkan/shaders

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README.md

Shader Variations

Example