video_core: add null backend

src/video_core/CMakeLists.txt

@@ -91,6 +91,10 @@ add_library(video_core STATIC
     rasterizer_interface.h
     renderer_base.cpp
     renderer_base.h
+    renderer_null/null_rasterizer.cpp
+    renderer_null/null_rasterizer.h
+    renderer_null/renderer_null.cpp
+    renderer_null/renderer_null.h
     renderer_opengl/gl_buffer_cache.cpp
     renderer_opengl/gl_buffer_cache.h
     renderer_opengl/gl_compute_pipeline.cpp

src/video_core/renderer_null/null_rasterizer.cpp

@@ -0,0 +1,90 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "video_core/host1x/host1x.h"
+#include "video_core/memory_manager.h"
+#include "video_core/renderer_null/null_rasterizer.h"
+
+namespace Null {
+
+AccelerateDMA::AccelerateDMA() = default;
+
+bool AccelerateDMA::BufferCopy(GPUVAddr start_address, GPUVAddr end_address, u64 amount) {
+    return true;
+}
+bool AccelerateDMA::BufferClear(GPUVAddr src_address, u64 amount, u32 value) {
+    return true;
+}
+
+RasterizerNull::RasterizerNull(Core::Memory::Memory& cpu_memory_, Tegra::GPU& gpu)
+    : RasterizerAccelerated(cpu_memory_), m_gpu{gpu} {}
+RasterizerNull::~RasterizerNull() = default;
+
+void RasterizerNull::Draw(bool is_indexed, u32 instance_count) {}
+void RasterizerNull::Clear(u32 layer_count) {}
+void RasterizerNull::DispatchCompute() {}
+void RasterizerNull::ResetCounter(VideoCore::QueryType type) {}
+void RasterizerNull::Query(GPUVAddr gpu_addr, VideoCore::QueryType type,
+                           std::optional<u64> timestamp) {
+    if (!gpu_memory) {
+        return;
+    }
+
+    gpu_memory->Write(gpu_addr, u64{0});
+    if (timestamp) {
+        gpu_memory->Write(gpu_addr + 8, *timestamp);
+    }
+}
+void RasterizerNull::BindGraphicsUniformBuffer(size_t stage, u32 index, GPUVAddr gpu_addr,
+                                               u32 size) {}
+void RasterizerNull::DisableGraphicsUniformBuffer(size_t stage, u32 index) {}
+void RasterizerNull::FlushAll() {}
+void RasterizerNull::FlushRegion(VAddr addr, u64 size) {}
+bool RasterizerNull::MustFlushRegion(VAddr addr, u64 size) {
+    return false;
+}
+void RasterizerNull::InvalidateRegion(VAddr addr, u64 size) {}
+void RasterizerNull::OnCPUWrite(VAddr addr, u64 size) {}
+void RasterizerNull::InvalidateGPUCache() {}
+void RasterizerNull::UnmapMemory(VAddr addr, u64 size) {}
+void RasterizerNull::ModifyGPUMemory(size_t as_id, GPUVAddr addr, u64 size) {}
+void RasterizerNull::SignalFence(std::function<void()>&& func) {
+    func();
+}
+void RasterizerNull::SyncOperation(std::function<void()>&& func) {
+    func();
+}
+void RasterizerNull::SignalSyncPoint(u32 value) {
+    auto& syncpoint_manager = m_gpu.Host1x().GetSyncpointManager();
+    syncpoint_manager.IncrementGuest(value);
+    syncpoint_manager.IncrementHost(value);
+}
+void RasterizerNull::SignalReference() {}
+void RasterizerNull::ReleaseFences() {}
+void RasterizerNull::FlushAndInvalidateRegion(VAddr addr, u64 size) {}
+void RasterizerNull::WaitForIdle() {}
+void RasterizerNull::FragmentBarrier() {}
+void RasterizerNull::TiledCacheBarrier() {}
+void RasterizerNull::FlushCommands() {}
+void RasterizerNull::TickFrame() {}
+Tegra::Engines::AccelerateDMAInterface& RasterizerNull::AccessAccelerateDMA() {
+    return m_accelerate_dma;
+}
+bool RasterizerNull::AccelerateSurfaceCopy(const Tegra::Engines::Fermi2D::Surface& src,
+                                           const Tegra::Engines::Fermi2D::Surface& dst,
+                                           const Tegra::Engines::Fermi2D::Config& copy_config) {
+    return true;
+}
+void RasterizerNull::AccelerateInlineToMemory(GPUVAddr address, size_t copy_size,
+                                              std::span<const u8> memory) {}
+bool RasterizerNull::AccelerateDisplay(const Tegra::FramebufferConfig& config,
+                                       VAddr framebuffer_addr, u32 pixel_stride) {
+    return true;
+}
+void RasterizerNull::LoadDiskResources(u64 title_id, std::stop_token stop_loading,
+                                       const VideoCore::DiskResourceLoadCallback& callback) {}
+void RasterizerNull::InitializeChannel(Tegra::Control::ChannelState& channel) {}
+void RasterizerNull::BindChannel(Tegra::Control::ChannelState& channel) {}
+void RasterizerNull::ReleaseChannel(s32 channel_id) {}
+
+} // namespace Null

src/video_core/renderer_null/null_rasterizer.h

@@ -0,0 +1,78 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/common_types.h"
+#include "video_core/control/channel_state_cache.h"
+#include "video_core/engines/maxwell_dma.h"
+#include "video_core/rasterizer_accelerated.h"
+#include "video_core/rasterizer_interface.h"
+
+namespace Core {
+class System;
+}
+
+namespace Null {
+
+class RasterizerNull;
+
+class AccelerateDMA : public Tegra::Engines::AccelerateDMAInterface {
+public:
+    explicit AccelerateDMA();
+    bool BufferCopy(GPUVAddr start_address, GPUVAddr end_address, u64 amount) override;
+    bool BufferClear(GPUVAddr src_address, u64 amount, u32 value) override;
+};
+
+class RasterizerNull final : public VideoCore::RasterizerAccelerated,
+                             protected VideoCommon::ChannelSetupCaches<VideoCommon::ChannelInfo> {
+public:
+    explicit RasterizerNull(Core::Memory::Memory& cpu_memory, Tegra::GPU& gpu);
+    ~RasterizerNull() override;
+
+    void Draw(bool is_indexed, u32 instance_count) override;
+    void Clear(u32 layer_count) override;
+    void DispatchCompute() override;
+    void ResetCounter(VideoCore::QueryType type) override;
+    void Query(GPUVAddr gpu_addr, VideoCore::QueryType type, std::optional<u64> timestamp) override;
+    void BindGraphicsUniformBuffer(size_t stage, u32 index, GPUVAddr gpu_addr, u32 size) override;
+    void DisableGraphicsUniformBuffer(size_t stage, u32 index) override;
+    void FlushAll() override;
+    void FlushRegion(VAddr addr, u64 size) override;
+    bool MustFlushRegion(VAddr addr, u64 size) override;
+    void InvalidateRegion(VAddr addr, u64 size) override;
+    void OnCPUWrite(VAddr addr, u64 size) override;
+    void InvalidateGPUCache() override;
+    void UnmapMemory(VAddr addr, u64 size) override;
+    void ModifyGPUMemory(size_t as_id, GPUVAddr addr, u64 size) override;
+    void SignalFence(std::function<void()>&& func) override;
+    void SyncOperation(std::function<void()>&& func) override;
+    void SignalSyncPoint(u32 value) override;
+    void SignalReference() override;
+    void ReleaseFences() override;
+    void FlushAndInvalidateRegion(VAddr addr, u64 size) override;
+    void WaitForIdle() override;
+    void FragmentBarrier() override;
+    void TiledCacheBarrier() override;
+    void FlushCommands() override;
+    void TickFrame() override;
+    bool AccelerateSurfaceCopy(const Tegra::Engines::Fermi2D::Surface& src,
+                               const Tegra::Engines::Fermi2D::Surface& dst,
+                               const Tegra::Engines::Fermi2D::Config& copy_config) override;
+    Tegra::Engines::AccelerateDMAInterface& AccessAccelerateDMA() override;
+    void AccelerateInlineToMemory(GPUVAddr address, size_t copy_size,
+                                  std::span<const u8> memory) override;
+    bool AccelerateDisplay(const Tegra::FramebufferConfig& config, VAddr framebuffer_addr,
+                           u32 pixel_stride) override;
+    void LoadDiskResources(u64 title_id, std::stop_token stop_loading,
+                           const VideoCore::DiskResourceLoadCallback& callback) override;
+    void InitializeChannel(Tegra::Control::ChannelState& channel) override;
+    void BindChannel(Tegra::Control::ChannelState& channel) override;
+    void ReleaseChannel(s32 channel_id) override;
+
+private:
+    Tegra::GPU& m_gpu;
+    AccelerateDMA m_accelerate_dma;
+};
+
+} // namespace Null

src/video_core/renderer_null/renderer_null.cpp

@@ -0,0 +1,24 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "video_core/renderer_null/renderer_null.h"
+
+namespace Null {
+
+RendererNull::RendererNull(Core::Frontend::EmuWindow& emu_window, Core::Memory::Memory& cpu_memory,
+                           Tegra::GPU& gpu,
+                           std::unique_ptr<Core::Frontend::GraphicsContext> context_)
+    : RendererBase(emu_window, std::move(context_)), m_gpu(gpu), m_rasterizer(cpu_memory, gpu) {}
+
+RendererNull::~RendererNull() = default;
+
+void RendererNull::SwapBuffers(const Tegra::FramebufferConfig* framebuffer) {
+    if (!framebuffer) {
+        return;
+    }
+
+    m_gpu.RendererFrameEndNotify();
+    render_window.OnFrameDisplayed();
+}
+
+} // namespace Null

src/video_core/renderer_null/renderer_null.h

@@ -0,0 +1,36 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <memory>
+#include <string>
+
+#include "video_core/renderer_base.h"
+#include "video_core/renderer_null/null_rasterizer.h"
+
+namespace Null {
+
+class RendererNull final : public VideoCore::RendererBase {
+public:
+    explicit RendererNull(Core::Frontend::EmuWindow& emu_window, Core::Memory::Memory& cpu_memory,
+                          Tegra::GPU& gpu,
+                          std::unique_ptr<Core::Frontend::GraphicsContext> context);
+    ~RendererNull() override;
+
+    void SwapBuffers(const Tegra::FramebufferConfig* framebuffer) override;
+
+    VideoCore::RasterizerInterface* ReadRasterizer() override {
+        return &m_rasterizer;
+    }
+
+    [[nodiscard]] std::string GetDeviceVendor() const override {
+        return "NULL";
+    }
+
+private:
+    Tegra::GPU& m_gpu;
+    RasterizerNull m_rasterizer;
+};
+
+} // namespace Null

src/video_core/video_core.cpp

@@ -7,6 +7,7 @@
 #include "common/settings.h"
 #include "core/core.h"
 #include "video_core/renderer_base.h"
+#include "video_core/renderer_null/renderer_null.h"
 #include "video_core/renderer_opengl/renderer_opengl.h"
 #include "video_core/renderer_vulkan/renderer_vulkan.h"
 #include "video_core/video_core.h"
@@ -26,6 +27,9 @@ std::unique_ptr<VideoCore::RendererBase> CreateRenderer(
     case Settings::RendererBackend::Vulkan:
         return std::make_unique<Vulkan::RendererVulkan>(telemetry_session, emu_window, cpu_memory,
                                                         gpu, std::move(context));
+    case Settings::RendererBackend::Null:
+        return std::make_unique<Null::RendererNull>(emu_window, cpu_memory, gpu,
+                                                    std::move(context));
     default:
         return nullptr;
     }