renderer_vulkan: Flush scheduler on renderpass end

* Follows the Mali guide recommendation and fixes performance regression introduced by async shaders commit

src/android/app/src/main/jni/config.cpp

@@ -118,6 +118,8 @@ void Config::ReadValues() {
         static_cast<Settings::GraphicsAPI>(sdl2_config->GetInteger("Renderer", "graphics_api", 2));
     Settings::values.async_command_recording =
         sdl2_config->GetBoolean("Renderer", "async_command_recording", true);
+    Settings::values.async_shader_compilation =
+        sdl2_config->GetBoolean("Renderer", "async_shader_compilation", true);
     Settings::values.spirv_shader_gen =
         sdl2_config->GetBoolean("Renderer", "spirv_shader_gen", true);
     Settings::values.renderer_debug = sdl2_config->GetBoolean("Renderer", "renderer_debug", false);

src/video_core/renderer_vulkan/vk_instance.h

@@ -207,6 +207,11 @@ public:
         return min_vertex_stride_alignment;
     }
 
+    /// Returns true if the physical device is a Mali gpu
+    bool IsMaliGpu() const {
+        return driver_id == vk::DriverIdKHR::eArmProprietary;
+    }
+
 private:
     /// Returns the optimal supported usage for the requested format
     [[nodiscard]] FormatTraits DetermineTraits(VideoCore::PixelFormat pixel_format,

src/video_core/renderer_vulkan/vk_renderpass_cache.cpp

@@ -84,15 +84,15 @@ RenderpassCache::~RenderpassCache() {
 void RenderpassCache::EnterRenderpass(const RenderpassState& state) {
     const bool is_dirty = scheduler.IsStateDirty(StateFlags::Renderpass);
     if (current_state == state && !is_dirty) {
+        cmd_count++;
         return;
     }
 
-    scheduler.Record(
-        [should_end = bool(current_state.renderpass), state](vk::CommandBuffer cmdbuf) {
-            if (should_end) {
-                cmdbuf.endRenderPass();
-            }
+    if (current_state.renderpass) {
+        ExitRenderpass();
+    }
 
+    scheduler.Record([state](vk::CommandBuffer cmdbuf) {
             const vk::RenderPassBeginInfo renderpass_begin_info = {
                 .renderPass = state.renderpass,
                 .framebuffer = state.framebuffer,
@@ -118,6 +118,13 @@ void RenderpassCache::ExitRenderpass() {
 
     scheduler.Record([](vk::CommandBuffer cmdbuf) { cmdbuf.endRenderPass(); });
     current_state = {};
+
+    // The Mali guide recommends flushing at the end of each major renderpass
+    // Testing has shown this has a significant effect on rendering performance
+    if (cmd_count > 20 && instance.IsMaliGpu()) {
+        scheduler.Flush();
+        cmd_count = 0;
+    }
 }
 
 void RenderpassCache::CreatePresentRenderpass(vk::Format format) {

src/video_core/renderer_vulkan/vk_renderpass_cache.h

@@ -62,6 +62,7 @@ private:
     RenderpassState current_state{};
     vk::RenderPass present_renderpass{};
     vk::RenderPass cached_renderpasses[MAX_COLOR_FORMATS + 1][MAX_DEPTH_FORMATS + 1][2];
+    u32 cmd_count{};
 };
 
 } // namespace Vulkan