Readbacks proof of concept rebased (#3178)

* Readbacks proof of concept

* liverpool: Use span for acb too

* config: Add readbacks config option

* config: Log readbacks

src/common/config.cpp

@@ -51,6 +51,7 @@ static bool isShowSplash = false;
 static std::string isSideTrophy = "right";
 static bool isNullGpu = false;
 static bool shouldCopyGPUBuffers = false;
+static bool readbacksEnabled = false;
 static bool shouldDumpShaders = false;
 static bool shouldPatchShaders = true;
 static u32 vblankDivider = 1;
@@ -240,6 +241,10 @@ bool copyGPUCmdBuffers() {
     return shouldCopyGPUBuffers;
 }
 
+bool readbacks() {
+    return readbacksEnabled;
+}
+
 bool dumpShaders() {
     return shouldDumpShaders;
 }
@@ -344,6 +349,10 @@ void setCopyGPUCmdBuffers(bool enable) {
     shouldCopyGPUBuffers = enable;
 }
 
+void setReadbacks(bool enable) {
+    readbacksEnabled = enable;
+}
+
 void setDumpShaders(bool enable) {
     shouldDumpShaders = enable;
 }
@@ -586,6 +595,7 @@ void load(const std::filesystem::path& path) {
         screenHeight = toml::find_or<int>(gpu, "screenHeight", screenHeight);
         isNullGpu = toml::find_or<bool>(gpu, "nullGpu", false);
         shouldCopyGPUBuffers = toml::find_or<bool>(gpu, "copyGPUBuffers", false);
+        readbacksEnabled = toml::find_or<bool>(gpu, "readbacks", false);
         shouldDumpShaders = toml::find_or<bool>(gpu, "dumpShaders", false);
         shouldPatchShaders = toml::find_or<bool>(gpu, "patchShaders", true);
         vblankDivider = toml::find_or<int>(gpu, "vblankDivider", 1);
@@ -735,6 +745,7 @@ void save(const std::filesystem::path& path) {
     data["GPU"]["screenHeight"] = screenHeight;
     data["GPU"]["nullGpu"] = isNullGpu;
     data["GPU"]["copyGPUBuffers"] = shouldCopyGPUBuffers;
+    data["GPU"]["readbacks"] = readbacksEnabled;
     data["GPU"]["dumpShaders"] = shouldDumpShaders;
     data["GPU"]["patchShaders"] = shouldPatchShaders;
     data["GPU"]["vblankDivider"] = vblankDivider;

src/common/config.h

@@ -45,6 +45,8 @@ bool nullGpu();
 void setNullGpu(bool enable);
 bool copyGPUCmdBuffers();
 void setCopyGPUCmdBuffers(bool enable);
+bool readbacks();
+void setReadbacks(bool enable);
 bool dumpShaders();
 void setDumpShaders(bool enable);
 u32 vblankDiv();