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fix(rendering): increase ImGui descriptor pool from 100 to 2048

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The pool was exhausted by cached spell/item/talent icon textures,
causing vkAllocateDescriptorSets to fail inside ImGui_ImplVulkan_AddTexture.
The NVIDIA driver crashed on the subsequent invalid descriptor write.

Also add a null-check on the returned descriptor set so pool exhaustion
gracefully returns VK_NULL_HANDLE instead of crashing.
This commit is contained in:
Kelsi 2026-04-03 18:14:46 -07:00
parent 2096e67bf9
commit 8e1addf7a6
1 changed files with 15 additions and 4 deletions
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19
src/rendering/vk_context.cpp
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@ -1177,15 +1177,18 @@ bool VkContext::createImGuiResources() {
}
}
// Create descriptor pool for ImGui
// Create descriptor pool for ImGui.
// Budget: ~10 internal ImGui sets + up to 2000 UI icon textures (spells,
// items, talents, buffs, etc.) that are uploaded and cached for the session.
static constexpr uint32_t IMGUI_POOL_SIZE = 2048;
VkDescriptorPoolSize poolSizes[] = {
{VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 100},
{VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, IMGUI_POOL_SIZE},
};
VkDescriptorPoolCreateInfo dpInfo{};
dpInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
dpInfo.flags = VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT;
dpInfo.maxSets = 100;
dpInfo.maxSets = IMGUI_POOL_SIZE;
dpInfo.poolSizeCount = 1;
dpInfo.pPoolSizes = poolSizes;
@ -1374,10 +1377,18 @@ VkDescriptorSet VkContext::uploadImGuiTexture(const uint8_t* rgba, int width, in
}
}
// Register with ImGui
// Register with ImGui (allocates from imguiDescriptorPool)
VkDescriptorSet ds = ImGui_ImplVulkan_AddTexture(uiTextureSampler_, imageView,
VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);
if (!ds) {
LOG_ERROR("ImGui descriptor pool exhausted — cannot upload UI texture");
vkDestroyImageView(device, imageView, nullptr);
vkDestroyImage(device, image, nullptr);
vkFreeMemory(device, imageMemory, nullptr);
return VK_NULL_HANDLE;
}
// Track for cleanup
uiTextures_.push_back({image, imageMemory, imageView});