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[Fix, Test] (MG_Util, MG_State, MG_Backend): the GL 4.3 vertex binding model - array vertex inputs, zero binding strides, instance divisors, and formats ES refuses

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swung0x48
2026-08-12 05:36:00 -04:00
parent 21b5fc2d92
commit 2fced2241b
13 changed files with 1129 additions and 29 deletions
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MobileGL/MG_Backend/DirectVulkan/Renderer/VertexInputStateFactory.cpp
+18 -6
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@@ -153,8 +153,14 @@ namespace MobileGL::MG_Backend::DirectVulkan {
continue;
}
const Uint32 sourceStride =
attr.Stride > 0 ? static_cast<Uint32>(attr.Stride) : static_cast<Uint32>(attribByteSize);
// Verbatim, zero included. The frontend already resolved a pointer call's
// "tightly packed" stride 0 into the element size (see VertexAttribute::Stride),
// so a zero here is the binding model's stride 0 - every vertex reads the same
// element - which is exactly what a zero VkVertexInputBindingDescription::stride
// means. Substituting the element size fetched a fresh element per vertex and ran
// off the end of the buffer (KHR-GL43.vertex_attrib_binding.basic-input-case7/8).
// Client-memory arrays cannot reach zero: they only exist on the pointer path.
const Uint32 sourceStride = static_cast<Uint32>(attr.Stride);
const Bool packedAttribute = attr.Type == DataType::Int2101010Rev ||
attr.Type == DataType::Uint2101010Rev;
const SizeT requiredAlignment = packedAttribute ? attribByteSize : GetComponentSize(attr.Type);
@@ -175,10 +181,16 @@ namespace MobileGL::MG_Backend::DirectVulkan {
}
Uint32 stride = sourceStride;
if (conversion == VertexStreamConversion::Repack) {
stride = static_cast<Uint32>(attribByteSize);
} else if (conversion == VertexStreamConversion::ScaledIntegerToFloat32) {
stride = static_cast<Uint32>(attr.Size * static_cast<Int>(sizeof(Float)));
// A converted stream is tightly packed, so its stride is the converted element
// size - unless the source stride is zero, which does not describe a packing at
// all but "never advance". That survives the conversion unchanged: the draw path
// converts exactly one element and every vertex reads it.
if (sourceStride != 0) {
if (conversion == VertexStreamConversion::Repack) {
stride = static_cast<Uint32>(attribByteSize);
} else if (conversion == VertexStreamConversion::ScaledIntegerToFloat32) {
stride = static_cast<Uint32>(attr.Size * static_cast<Int>(sizeof(Float)));
}
}
const VkVertexInputRate inputRate =
(attr.Divisor == 0) ? VK_VERTEX_INPUT_RATE_VERTEX : VK_VERTEX_INPUT_RATE_INSTANCE;