[Vulkan] Implement Pipeline Derivatives

Applies mostly on android devices, should be tested for regressions on other platforms as well just incase.

src/video_core/renderer_vulkan/vk_graphics_pipeline.cpp

@@ -248,8 +248,10 @@ GraphicsPipeline::GraphicsPipeline(
     GuestDescriptorQueue& guest_descriptor_queue_, Common::ThreadWorker* worker_thread,
     PipelineStatistics* pipeline_statistics, RenderPassCache& render_pass_cache,
     const GraphicsPipelineCacheKey& key_, std::array<vk::ShaderModule, NUM_STAGES> stages,
-    const std::array<const Shader::Info*, NUM_STAGES>& infos)
-    : key{key_}, device{device_}, texture_cache{texture_cache_}, buffer_cache{buffer_cache_},
+    const std::array<const Shader::Info*, NUM_STAGES>& infos,
+    GraphicsPipeline* base_pipeline_)
+    : key{key_}, base_pipeline{base_pipeline_}, allow_derivatives{base_pipeline_ == nullptr},
+    device{device_}, texture_cache{texture_cache_}, buffer_cache{buffer_cache_},
     pipeline_cache(pipeline_cache_), scheduler{scheduler_},
     guest_descriptor_queue{guest_descriptor_queue_}, spv_modules{std::move(stages)} {
     if (shader_notify) {
@@ -935,6 +937,18 @@ void GraphicsPipeline::MakePipeline(VkRenderPass render_pass) {
     if (device.IsKhrPipelineExecutablePropertiesEnabled() && Settings::values.renderer_debug.GetValue()) {
         flags |= VK_PIPELINE_CREATE_CAPTURE_STATISTICS_BIT_KHR;
     }
+    VkPipeline base_handle = VK_NULL_HANDLE;
+
+    // First pipeline in a "cluster" allows derivatives
+    if (allow_derivatives) {
+        flags |= VK_PIPELINE_CREATE_ALLOW_DERIVATIVES_BIT;
+    }
+
+    // Children mark themselves as derivatives when base is already built
+    if (base_pipeline != nullptr && base_pipeline->IsBuilt()) {
+        flags |= VK_PIPELINE_CREATE_DERIVATIVE_BIT;
+        base_handle = *base_pipeline->pipeline;
+    }
 
     pipeline = device.GetLogical().CreateGraphicsPipeline(
         {
@@ -955,8 +969,8 @@ void GraphicsPipeline::MakePipeline(VkRenderPass render_pass) {
             .layout = *pipeline_layout,
             .renderPass = render_pass,
             .subpass = 0,
-            .basePipelineHandle = nullptr,
-            .basePipelineIndex = 0,
+            .basePipelineHandle = base_handle,
+            .basePipelineIndex = -1,
         },
         *pipeline_cache);
 }

src/video_core/renderer_vulkan/vk_graphics_pipeline.h

@@ -79,9 +79,14 @@ public:
         GuestDescriptorQueue& guest_descriptor_queue, Common::ThreadWorker* worker_thread,
         PipelineStatistics* pipeline_statistics, RenderPassCache& render_pass_cache,
         const GraphicsPipelineCacheKey& key, std::array<vk::ShaderModule, NUM_STAGES> stages,
-        const std::array<const Shader::Info*, NUM_STAGES>& infos);
+        const std::array<const Shader::Info*, NUM_STAGES>& infos,
+        GraphicsPipeline* base_pipeline = nullptr);
+
 
     bool HasDynamicVertexInput() const noexcept { return key.state.dynamic_vertex_input; }
+    [[nodiscard]] const GraphicsPipelineCacheKey& Key() const noexcept {
+        return key;
+    }
     GraphicsPipeline& operator=(GraphicsPipeline&&) noexcept = delete;
     GraphicsPipeline(GraphicsPipeline&&) noexcept = delete;
 
@@ -129,6 +134,8 @@ private:
     void Validate();
 
     const GraphicsPipelineCacheKey key;
+    GraphicsPipeline* base_pipeline = nullptr; // non-owning
+    bool allow_derivatives = false;
     Tegra::Engines::Maxwell3D* maxwell3d;
     Tegra::MemoryManager* gpu_memory;
     const Device& device;

src/video_core/renderer_vulkan/vk_pipeline_cache.cpp

@@ -575,8 +575,18 @@ GraphicsPipeline* PipelineCache::CurrentGraphicsPipelineSlowPath() {
     const auto [pair, is_new]{graphics_cache.try_emplace(graphics_key)};
     auto& pipeline{pair->second};
     if (is_new) {
-        pipeline = CreateGraphicsPipeline();
+       GraphicsPipeline* base = nullptr;
+
+            // Use the current pipeline as a base if shaders match
+            if (current_pipeline) {
+                const auto& base_key = current_pipeline->Key();
+                if (base_key.unique_hashes == graphics_key.unique_hashes) {
+                    base = current_pipeline;
+                }
+    }
+    pipeline = CreateGraphicsPipeline(base);
     }
+
     if (!pipeline) {
         return nullptr;
     }
@@ -607,7 +617,7 @@ GraphicsPipeline* PipelineCache::BuiltPipeline(GraphicsPipeline* pipeline) const
 std::unique_ptr<GraphicsPipeline> PipelineCache::CreateGraphicsPipeline(
     ShaderPools& pools, const GraphicsPipelineCacheKey& key,
     std::span<Shader::Environment* const> envs, PipelineStatistics* statistics,
-    bool build_in_parallel) try {
+    bool build_in_parallel, GraphicsPipeline* base_pipeline) try {
     auto hash = key.Hash();
     LOG_INFO(Render_Vulkan, "0x{:016x}", hash);
     size_t env_index{0};
@@ -686,7 +696,7 @@ std::unique_ptr<GraphicsPipeline> PipelineCache::CreateGraphicsPipeline(
     return std::make_unique<GraphicsPipeline>(
         scheduler, buffer_cache, texture_cache, vulkan_pipeline_cache, &shader_notify, device,
         descriptor_pool, guest_descriptor_queue, thread_worker, statistics, render_pass_cache, key,
-        std::move(modules), infos);
+        std::move(modules), infos, base_pipeline);
 
 } catch (const Shader::Exception& exception) {
     auto hash = key.Hash();
@@ -707,16 +717,23 @@ std::unique_ptr<GraphicsPipeline> PipelineCache::CreateGraphicsPipeline(
 }
 
 std::unique_ptr<GraphicsPipeline> PipelineCache::CreateGraphicsPipeline() {
+    // Preserve old behaviour, no base pipeline
+    return CreateGraphicsPipeline(nullptr);
+}
+
+std::unique_ptr<GraphicsPipeline> PipelineCache::CreateGraphicsPipeline(
+       GraphicsPipeline* base_pipeline) {
     GraphicsEnvironments environments;
     GetGraphicsEnvironments(environments, graphics_key.unique_hashes);
 
     main_pools.ReleaseContents();
-    auto pipeline{
-        CreateGraphicsPipeline(main_pools, graphics_key, environments.Span(), nullptr, true)};
+    auto pipeline{CreateGraphicsPipeline(main_pools, graphics_key, environments.Span(),
+                                         nullptr, true, base_pipeline)};
     if (!pipeline || pipeline_cache_filename.empty()) {
         return pipeline;
     }
-    serialization_thread.QueueWork([this, key = graphics_key, envs = std::move(environments.envs)] {
+    serialization_thread.QueueWork(
+            [this, key = graphics_key, envs = std::move(environments.envs)] {
         boost::container::static_vector<const GenericEnvironment*, Maxwell::MaxShaderProgram>
             env_ptrs;
         for (size_t index = 0; index < Maxwell::MaxShaderProgram; ++index) {

src/video_core/renderer_vulkan/vk_pipeline_cache.h

@@ -119,11 +119,12 @@ private:
     [[nodiscard]] GraphicsPipeline* BuiltPipeline(GraphicsPipeline* pipeline) const noexcept;
 
     std::unique_ptr<GraphicsPipeline> CreateGraphicsPipeline();
+    std::unique_ptr<GraphicsPipeline> CreateGraphicsPipeline(GraphicsPipeline* base_pipeline);
 
     std::unique_ptr<GraphicsPipeline> CreateGraphicsPipeline(
         ShaderPools& pools, const GraphicsPipelineCacheKey& key,
         std::span<Shader::Environment* const> envs, PipelineStatistics* statistics,
-        bool build_in_parallel);
+        bool build_in_parallel, GraphicsPipeline* base_pipeline = nullptr);
 
     std::unique_ptr<ComputePipeline> CreateComputePipeline(const ComputePipelineCacheKey& key,
                                                            const ShaderInfo* shader);