rhi: Add support for half precision vertex atttributes

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Runtime support is indicated via QRhi::Feature::HalfAttributes.

OpenGL support is available in OpenGL 3.0+, OpenGL ES 3.0+, and in
implementations that support the extension GL_ARB_half_float_vertex.

Other RHI backends (Vulkan, Metal, D3D11, and D3D12) all support this
feature.

Note that D3D does not support the half3 type.  D3D backends pass half3
as half4.

tst_qrhi auto unit test included.

Change-Id: Ide05d7f62f6102ad5cae1b3681fdda98d52bca31
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

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This commit is contained in:

Ben Fletcher 2023-02-20 21:25:03 -08:00

parent 9ffa16baf0

commit 5dfb25e253

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