ASTC: decode and re-compress to BC1/BC3 on the GPU; texture cache budget

- accelerate_astc=Gpu with astc_recompression=Bc1/Bc3 now decodes ASTC
  with the GPU decoder into a temporary RGBA8 image (dedicated memory,
  freed once the GPU is past it) and compresses it with a new compute
  shader (bc_encoder.comp: bounding-box endpoints along the colours'
  covariance, inset 1/16, nearest palette entry; BC3 alpha ramp; BC1
  punch-through), then copies the blocks into the image. No CPU decode,
  so streamed textures are ready the frame they are first used instead
  of showing placeholders for seconds; the decode pass no longer waits
  for the GPU on this path.
- The CPU path (CpuAsynchronous) fills a new image with zero blocks
  before its first decode instead of showing stale VRAM, and the
  transcode pool is a quarter of the hardware threads.
- Switch 2 titles: collector thresholds near the device budget, re-read
  every 60 frames from VK_EXT_memory_budget (another game shrank it from
  7.0 to 5.4 GB).
- EDEN_NX2_HIDE_WINDOW=0 now leaves the window visible.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/video_core/vulkan_common/vulkan_device.cpp b/src/video_core/vulkan_common/vulkan_device.cpp
index be09bca8d3..454e5d4e02 100644
--- a/src/video_core/vulkan_common/vulkan_device.cpp
+++ b/src/video_core/vulkan_common/vulkan_device.cpp
@@ -1612,6 +1612,20 @@ u64 Device::GetDeviceMemoryUsage() const {
     return result;
 }
 
+u64 Device::GetDeviceMemoryBudget() const {
+    if (!extensions.memory_budget) {
+        return 0;
+    }
+    VkPhysicalDeviceMemoryBudgetPropertiesEXT budget{};
+    budget.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_MEMORY_BUDGET_PROPERTIES_EXT;
+    physical.GetMemoryProperties(&budget);
+    u64 result{};
+    for (const size_t heap : valid_heap_memory) {
+        result += budget.heapBudget[heap];
+    }
+    return result;
+}
+
 void Device::CollectPhysicalMemoryInfo() {
     // Calculate limits using memory budget
     VkPhysicalDeviceMemoryBudgetPropertiesEXT budget{};