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General: Make use of std::nullopt where applicable

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Allows some implementations to avoid completely zeroing out the internal
buffer of the optional, and instead only set the validity byte within
the structure.

This also makes it consistent how we return empty optionals.
This commit is contained in:
Lioncash 2020-09-22 17:31:53 -04:00
parent f3b0c1b4b5
commit e457001dce
17 changed files with 60 additions and 59 deletions
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12
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
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@ -813,7 +813,7 @@ private:
const u8 location = static_cast<u8>(static_cast<u32>(index) * 4 + element);
const auto it = transform_feedback.find(location);
if (it == transform_feedback.end()) {
return {};
return std::nullopt;
}
return it->second.components;
}
@ -1295,21 +1295,21 @@ private:
switch (element) {
case 0:
UNIMPLEMENTED();
return {};
return std::nullopt;
case 1:
if (stage == ShaderType::Vertex && !device.HasVertexViewportLayer()) {
return {};
return std::nullopt;
}
return {{"gl_Layer", Type::Int}};
case 2:
if (stage == ShaderType::Vertex && !device.HasVertexViewportLayer()) {
return {};
return std::nullopt;
}
return {{"gl_ViewportIndex", Type::Int}};
case 3:
return {{"gl_PointSize", Type::Float}};
}
return {};
return std::nullopt;
case Attribute::Index::FrontColor:
return {{"gl_FrontColor"s + GetSwizzle(element), Type::Float}};
case Attribute::Index::FrontSecondaryColor:
@ -1332,7 +1332,7 @@ private:
Type::Float}};
}
UNIMPLEMENTED_MSG("Unhandled output attribute: {}", static_cast<u32>(attribute));
return {};
return std::nullopt;
}
}