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[Fix, Test] (DirectGLES, DirectVulkan): narrow GL_DOUBLE vertex arrays to float32 instead of dropping them

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swung0x48
2026-08-20 23:54:49 -04:00
parent 1b5a39473e
commit 7aa91e8024
8 changed files with 436 additions and 62 deletions
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MobileGL/MG_Backend/DirectVulkan/Renderer/VertexInputStateFactory.cpp
+24 -9
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@@ -108,8 +108,23 @@ namespace MobileGL::MG_Backend::DirectVulkan {
continue;
}
const VkFormat sourceVkFormat =
VkFormat sourceVkFormat =
ToVkVertexFormat(attr.Type, attr.Size, attr.Normalized, attr.IsInteger, attr.IsBgra, attr.IsLong);
VertexStreamConversion conversion = VertexStreamConversion::None;
if (sourceVkFormat == VK_FORMAT_UNDEFINED && attr.Type == DataType::Float64) {
// No native 64-bit fetch here (see ToVkVertexFormat's Float64 case), but the
// source bytes are ordinary IEEE-754 doubles and DemoteFloat64Pass has already
// narrowed every dvec input to a vec, so the array is narrowed to match rather
// than dropped. Mirrors what DirectGLES does for the same state.
const VkFormat narrowedFormat = ToFloat32VertexFormat(attr.Size);
if (narrowedFormat != VK_FORMAT_UNDEFINED && SupportsVertexBufferFormat(narrowedFormat)) {
sourceVkFormat = narrowedFormat;
conversion = VertexStreamConversion::Float64ToFloat32;
MGLOG_W_ONCE("Vertex attribute location=%u is a 64-bit (GL_DOUBLE) array; fetching it at "
"float32 precision through format=%d (size=%d long=%s)",
location, static_cast<Int>(narrowedFormat), attr.Size, attr.IsLong ? "true" : "false");
}
}
if (sourceVkFormat == VK_FORMAT_UNDEFINED) {
MGLOG_E_ONCE("Unsupported vertex attribute layout (location=%u, type=%s, size=%d): the array is "
"enabled but cannot be mapped to a VkFormat",
@@ -119,8 +134,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
}
VkFormat vkFormat = sourceVkFormat;
VertexStreamConversion conversion = VertexStreamConversion::None;
if (!SupportsVertexBufferFormat(vkFormat)) {
if (conversion == VertexStreamConversion::None && !SupportsVertexBufferFormat(vkFormat)) {
if (IsScaledIntegerVertexFormat(vkFormat)) {
const VkFormat fallbackFormat = ToFloat32VertexFormat(attr.Size);
if (fallbackFormat != VK_FORMAT_UNDEFINED && SupportsVertexBufferFormat(fallbackFormat)) {
@@ -189,7 +203,8 @@ namespace MobileGL::MG_Backend::DirectVulkan {
if (sourceStride != 0) {
if (conversion == VertexStreamConversion::Repack) {
stride = static_cast<Uint32>(attribByteSize);
} else if (conversion == VertexStreamConversion::ScaledIntegerToFloat32) {
} else if (conversion == VertexStreamConversion::ScaledIntegerToFloat32 ||
conversion == VertexStreamConversion::Float64ToFloat32) {
stride = static_cast<Uint32>(attr.Size * static_cast<Int>(sizeof(Float)));
}
}
@@ -336,11 +351,11 @@ namespace MobileGL::MG_Backend::DirectVulkan {
// no 64-bit vertex attribute support: DemoteFloat64Pass has already narrowed every
// `dvec` input to a `vec` by then, so PackDoubleVertexInputsPass finds nothing to pack
// and a UINT-formatted attribute would be fed to a float input - garbage with no
// diagnostic anywhere. Declining here drops the array instead (the caller skips
// UNDEFINED attributes and reports them through unsupportedAttribMask), which is what
// DirectGLES does for the same state. The frontend RECORDS the format either way, so
// this gate is the only thing standing between a legal glVertexAttribLFormat and a
// mismatched pipeline.
// diagnostic anywhere. Declining here hands the attribute to the caller's
// Float64ToFloat32 fallback instead, which narrows the source doubles to match the
// demoted `vec` input - the same thing DirectGLES does for the same state. The
// frontend RECORDS the format either way, so this gate is the only thing standing
// between a legal glVertexAttribLFormat and a mismatched pipeline.
if (MG_Backend::pActiveBackendObject == nullptr ||
!MG_Backend::pActiveBackendObject->GetDynamicParameters().SupportsFloat64VertexAttributes) {
return VK_FORMAT_UNDEFINED;