config, video_core: null gpu configuration added

src/common/config.cpp

@@ -18,6 +18,7 @@ std::string logType = "sync";
 bool isDebugDump = false;
 bool isLibc = true;
 bool isShowSplash = false;
+bool isNullGpu = false;
 
 bool isLleLibc() {
     return isLibc;
@@ -54,6 +55,10 @@ bool showSplash() {
     return isShowSplash;
 }
 
+bool nullGpu() {
+    return isNullGpu;
+}
+
 void load(const std::filesystem::path& path) {
     // If the configuration file does not exist, create it and return
     std::error_code error;
@@ -90,6 +95,7 @@ void load(const std::filesystem::path& path) {
             screenWidth = toml::find_or<toml::integer>(gpu, "screenWidth", screenWidth);
             screenHeight = toml::find_or<toml::integer>(gpu, "screenHeight", screenHeight);
             gpuId = toml::find_or<toml::integer>(gpu, "gpuId", 0);
+            isNullGpu = toml::find_or<toml::boolean>(gpu, "nullGpu", false);
         }
     }
     if (data.contains("Debug")) {
@@ -135,6 +141,7 @@ void save(const std::filesystem::path& path) {
     data["GPU"]["gpuId"] = gpuId;
     data["GPU"]["screenWidth"] = screenWidth;
     data["GPU"]["screenHeight"] = screenHeight;
+    data["GPU"]["nullGpu"] = isNullGpu;
     data["Debug"]["DebugDump"] = isDebugDump;
     data["LLE"]["libc"] = isLibc;
 

src/common/config.h

@@ -21,5 +21,6 @@ s32 getGpuId();
 bool debugDump();
 bool isLleLibc();
 bool showSplash();
+bool nullGpu();
 
 }; // namespace Config

src/video_core/amdgpu/liverpool.cpp

@@ -108,7 +108,9 @@ void Liverpool::ProcessCmdList(const u32* cmdbuf, u32 size_in_bytes) {
                 regs.index_base_address.base_addr_hi.Assign(draw_index->index_base_hi);
                 regs.num_indices = draw_index->index_count;
                 regs.draw_initiator = draw_index->draw_initiator;
-                rasterizer->DrawIndex();
+                if (rasterizer) {
+                    rasterizer->DrawIndex();
+                }
                 break;
             }
             case PM4ItOpcode::DrawIndexAuto: {

src/video_core/amdgpu/liverpool.h

@@ -644,7 +644,7 @@ private:
     void ProcessCmdList(const u32* cmdbuf, u32 size_in_bytes);
     void Process(std::stop_token stoken);
 
-    Vulkan::Rasterizer* rasterizer;
+    Vulkan::Rasterizer* rasterizer{};
     std::jthread process_thread{};
     std::queue<std::span<const u32>> gfx_ring{};
     std::condition_variable_any cv_submit{};

src/video_core/renderer_vulkan/vk_rasterizer.cpp

@@ -1,6 +1,7 @@
 // SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include "common/config.h"
 #include "video_core/amdgpu/liverpool.h"
 #include "video_core/renderer_vulkan/vk_instance.h"
 #include "video_core/renderer_vulkan/vk_rasterizer.h"
@@ -19,7 +20,9 @@ Rasterizer::Rasterizer(const Instance& instance_, Scheduler& scheduler_,
     : instance{instance_}, scheduler{scheduler_}, texture_cache{texture_cache_},
       liverpool{liverpool_}, pipeline_cache{instance, scheduler, liverpool},
       vertex_index_buffer{instance, scheduler, VertexIndexFlags, 64_MB} {
-    liverpool->BindRasterizer(this);
+    if (!Config::nullGpu()) {
+        liverpool->BindRasterizer(this);
+    }
 }
 
 Rasterizer::~Rasterizer() = default;