[vk, qcom] Samplers Budget Management

src/video_core/vulkan_common/vulkan_device.cpp

@@ -606,6 +606,17 @@ Device::Device(VkInstance instance_, vk::PhysicalDevice physical_, VkSurfaceKHR
             version == VK_MAKE_API_VERSION(0, 512, 800, 51)) {
             has_broken_parallel_compiling = true;
         }
+        const size_t sampler_limit = properties.properties.limits.maxSamplerAllocationCount;
+        if (sampler_limit > 0) {
+            constexpr size_t MIN_SAMPLER_BUDGET = 1024U;
+            const size_t derived_budget =
+                (std::max)(MIN_SAMPLER_BUDGET, sampler_limit / 4U);
+            sampler_heap_budget = derived_budget;
+            LOG_WARNING(Render_Vulkan,
+                        "Qualcomm driver reports max {} samplers; clamping cache to {} (25%) to "
+                        "avoid heap exhaustion",
+                        sampler_limit, sampler_heap_budget);
+        }
     }
 
     if (extensions.sampler_filter_minmax && is_amd) {
@@ -1542,6 +1553,13 @@ void Device::SetupFamilies(VkSurfaceKHR surface) {
     }
 }
 
+std::optional<size_t> Device::GetSamplerHeapBudget() const {
+    if (sampler_heap_budget == 0) {
+        return std::nullopt;
+    }
+    return sampler_heap_budget;
+}
+
 u64 Device::GetDeviceMemoryUsage() const {
     VkPhysicalDeviceMemoryBudgetPropertiesEXT budget;
     budget.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_MEMORY_BUDGET_PROPERTIES_EXT;

src/video_core/vulkan_common/vulkan_device.h

@@ -6,6 +6,7 @@
 
 #pragma once
 
+#include <optional>
 #include <set>
 #include <span>
 #include <string>
@@ -759,6 +760,8 @@ public:
         return has_broken_parallel_compiling;
     }
 
+    std::optional<size_t> GetSamplerHeapBudget() const;
+
     /// Returns the vendor name reported from Vulkan.
     std::string_view GetVendorName() const {
         return properties.driver.driverName;
@@ -1055,6 +1058,7 @@ private:
     bool dynamic_state3_alpha_to_coverage{};
     bool dynamic_state3_alpha_to_one{};
     bool supports_conditional_barriers{};      ///< Allows barriers in conditional control flow.
+    size_t sampler_heap_budget{};              ///< Sampler budget for buggy drivers (0 = unlimited).
     u64 device_access_memory{};                ///< Total size of device local memory in bytes.
     u32 sets_per_pool{};                       ///< Sets per Description Pool
     NvidiaArchitecture nvidia_arch{NvidiaArchitecture::Arch_AmpereOrNewer};