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[Fix, Test] (BackendLoader, DirectGLES, DirectVulkan, GLImpl): answer the layer and viewport-index provoking-vertex conventions from the backend

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swung0x48
2026-08-20 15:40:25 -04:00
parent 51883cf1a3
commit d24d5b5ccd
8 changed files with 205 additions and 6 deletions
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MobileGL/MG_Backend/DirectGLES/BackendObject_DirectGLES.cpp
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@@ -1336,6 +1336,13 @@ namespace MobileGL::MG_Backend::DirectGLES {
m_dynamicParameters.MaxColorAttachments = m_GLESCapabilities.MaxColorAttachments;
m_dynamicParameters.MaxClipDistances = m_GLESCapabilities.MaxClipDistances;
m_dynamicParameters.MaxViewports = m_GLESCapabilities.MaxViewports;
// Whatever the driver said about which vertex supplies gl_Layer, and GL_UNDEFINED_VERTEX
// for gl_ViewportIndex on every driver without GL_OES_viewport_array - which is both test
// devices. That is not a shortfall being hidden: without the extension only viewport 0 is
// ever rasterized, so no vertex "selects" a viewport index and naming a convention would
// describe behaviour this backend does not implement.
m_dynamicParameters.LayerProvokingVertex = m_GLESCapabilities.LayerProvokingVertex;
m_dynamicParameters.ViewportIndexProvokingVertex = m_GLESCapabilities.ViewportIndexProvokingVertex;
m_dynamicParameters.MaxViewportWidth = m_GLESCapabilities.MaxViewportWidth;
m_dynamicParameters.MaxViewportHeight = m_GLESCapabilities.MaxViewportHeight;
m_dynamicParameters.ViewportBoundsRangeMin = m_GLESCapabilities.ViewportBoundsRangeMin;