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[Fix] (MG_Backend/DirectVulkan): blendEnable was baked into pipelines without checking VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT; disable blending on formats that lack it

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This commit is contained in:
swung0x48
2026-07-17 20:03:53 -04:00
parent 48568cdb89
commit 6b223e4d23
1 changed files with 24 additions and 11 deletions
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MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.cpp
+24 -11
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@@ -3183,17 +3183,30 @@ void main() {
colorAttachmentFormat = textureResource->format;
}
#if MOBILEGL_LOG_ACTIVE_LEVEL <= MOBILEGL_LOG_LEVEL_DEBUG
VkFormatProperties formatProperties{};
vkGetPhysicalDeviceFormatProperties(m_physicalDevice.handle, colorAttachmentFormat, &formatProperties);
MOBILEGL_ASSERT(
(formatProperties.optimalTilingFeatures & VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT) != 0,
"GetOrCreatePipeline: blend is enabled on color attachment %u for format=%d textureId=%d, but the format lacks VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT (program=%u)",
i,
static_cast<Int>(colorAttachmentFormat),
textureExternalIndex,
program.GetExternalIndex());
#endif
// Blending on an attachment whose format lacks
// VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT is invalid pipeline state
// (blend support is optional for e.g. 32-bit float formats on some GPUs);
// force-disable it instead of baking undefined behavior into the pipeline.
static UnorderedMap<Int, Bool> formatBlendSupport;
auto blendSupportIt = formatBlendSupport.find(static_cast<Int>(colorAttachmentFormat));
if (blendSupportIt == formatBlendSupport.end()) {
VkFormatProperties formatProperties{};
vkGetPhysicalDeviceFormatProperties(m_physicalDevice.handle, colorAttachmentFormat,
&formatProperties);
const Bool blendable =
(formatProperties.optimalTilingFeatures & VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT) != 0;
blendSupportIt =
formatBlendSupport.emplace(static_cast<Int>(colorAttachmentFormat), blendable).first;
if (!blendable) {
MGLOG_E("GetOrCreatePipeline: format=%d lacks VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT; "
"disabling blending on attachments with this format (first hit: attachment %u textureId=%d program=%u)",
static_cast<Int>(colorAttachmentFormat), i, textureExternalIndex,
program.GetExternalIndex());
}
}
if (!blendSupportIt->second) {
effectiveBlendEnabled = false;
}
}
// Dual-source blending (GL_SRC1_* factors from glBlendFunc paired with
// glBindFragDataLocationIndexed) requires the dualSrcBlend device feature. It is detected at