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Pick dedicated GPU with highest VRAM

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suleyth
2025-08-16 11:56:47 +02:00
committed by Ethan Lee
parent 5f77da3a50
commit c5b79e5f1b
1 changed files with 21 additions and 2 deletions
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23
src/gpu/vulkan/SDL_gpu_vulkan.c
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@@ -11252,13 +11252,14 @@ static Uint8 VULKAN_INTERNAL_IsDeviceSuitable(
VkPhysicalDevice physicalDevice,
VulkanExtensions *physicalDeviceExtensions,
Uint32 *queueFamilyIndex,
Uint8 *deviceRank)
Uint16 *deviceRank)
{
Uint32 queueFamilyCount, queueFamilyRank, queueFamilyBest;
VkQueueFamilyProperties *queueProps;
bool supportsPresent;
VkPhysicalDeviceProperties deviceProperties;
VkPhysicalDeviceFeatures deviceFeatures;
VkPhysicalDeviceMemoryProperties deviceMemory;
Uint32 i;
const Uint8 *devicePriority = renderer->preferLowPower ? DEVICE_PRIORITY_LOWPOWER : DEVICE_PRIORITY_HIGHPERFORMANCE;
@@ -11285,6 +11286,24 @@ static Uint8 VULKAN_INTERNAL_IsDeviceSuitable(
return 0;
}
/* If we prefer high performance, sum up all device local memory (rounded to megabytes)
* to deviceRank. In the niche case of someone having multiple dedicated GPUs in the same
* system, this theoretically picks the most powerful one (or at least the one with the
* most memory!)
*/
renderer->vkGetPhysicalDeviceMemoryProperties(physicalDevice, &deviceMemory);
Uint64 videoMemory = 0;
for (i = 0; i < deviceMemory.memoryHeapCount; i++) {
VkMemoryHeap heap = deviceMemory.memoryHeaps[i];
if (heap.flags & VK_MEMORY_HEAP_DEVICE_LOCAL_BIT) {
videoMemory += heap.size;
}
}
// Round it to megabytes (as per the vulkan spec videoMemory is in bytes)
Uint64 videoMemoryRounded = videoMemory / 1024 / 1024;
*deviceRank += videoMemoryRounded;
renderer->vkGetPhysicalDeviceFeatures(
physicalDevice,
&deviceFeatures);
@@ -11392,7 +11411,7 @@ static Uint8 VULKAN_INTERNAL_DeterminePhysicalDevice(VulkanRenderer *renderer)
Uint32 i, physicalDeviceCount;
Sint32 suitableIndex;
Uint32 queueFamilyIndex, suitableQueueFamilyIndex;
Uint8 deviceRank, highestRank;
Uint16 deviceRank, highestRank;
vulkanResult = renderer->vkEnumeratePhysicalDevices(
renderer->instance,