From a1faed99501d04b233d44a7cab0368449d8a9cb5 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Sun, 13 Jan 2019 23:33:31 -0300
Subject: [PATCH] gl_shader_disk_cache: Add precompiled load

---
 .../renderer_opengl/gl_shader_disk_cache.cpp  | 39 +++++++++++++++++++
 .../renderer_opengl/gl_shader_disk_cache.h    |  6 +++
 2 files changed, 45 insertions(+)

diff --git a/src/video_core/renderer_opengl/gl_shader_disk_cache.cpp b/src/video_core/renderer_opengl/gl_shader_disk_cache.cpp
index 0c42e3d8a3..a87bb1f9ed 100644
--- a/src/video_core/renderer_opengl/gl_shader_disk_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_disk_cache.cpp
@@ -121,6 +121,45 @@ bool ShaderDiskCacheOpenGL::LoadTransferable(std::vector<ShaderDiskCacheRaw>& ra
     return true;
 }
 
+std::vector<ShaderDiskCachePrecompiledEntry> ShaderDiskCacheOpenGL::LoadPrecompiled() {
+    FileUtil::IOFile file(GetPrecompiledPath(), "rb");
+    if (!file.IsOpen()) {
+        LOG_INFO(Render_OpenGL, "No precompiled shader cache found for game with title id={}",
+                 GetTitleID());
+        return {};
+    }
+    const u64 file_size = file.GetSize();
+
+    u64 precompiled_hash{};
+    file.ReadBytes(&precompiled_hash, sizeof(precompiled_hash));
+    if (precompiled_hash != PrecompiledHash) {
+        LOG_INFO(Render_OpenGL, "Precompiled cache is from another version of yuzu - removing");
+        file.Close();
+        InvalidatePrecompiled();
+        return {};
+    }
+
+    std::vector<ShaderDiskCachePrecompiledEntry> precompiled;
+    while (file.Tell() < file_size) {
+        ShaderDiskCachePrecompiledEntry entry;
+        file.ReadBytes(&entry.usage, sizeof(entry.usage));
+
+        file.ReadBytes(&entry.binary_format, sizeof(u32));
+
+        u32 binary_length{};
+        file.ReadBytes(&binary_length, sizeof(u32));
+        entry.binary.resize(binary_length);
+        file.ReadBytes(entry.binary.data(), entry.binary.size());
+
+        precompiled.push_back(entry);
+    }
+    return precompiled;
+}
+
+void ShaderDiskCacheOpenGL::InvalidatePrecompiled() const {
+    FileUtil::Delete(GetPrecompiledPath());
+}
+
 void ShaderDiskCacheOpenGL::SaveRaw(const ShaderDiskCacheRaw& entry) {
     const u64 id = entry.GetUniqueIdentifier();
     if (transferable.find(id) != transferable.end()) {
diff --git a/src/video_core/renderer_opengl/gl_shader_disk_cache.h b/src/video_core/renderer_opengl/gl_shader_disk_cache.h
index fdb29caa5a..e68aea6940 100644
--- a/src/video_core/renderer_opengl/gl_shader_disk_cache.h
+++ b/src/video_core/renderer_opengl/gl_shader_disk_cache.h
@@ -144,6 +144,12 @@ public:
     bool LoadTransferable(std::vector<ShaderDiskCacheRaw>& raws,
                           std::vector<ShaderDiskCacheUsage>& usages);
 
+    /// Loads current game's precompiled cache. Invalidates if emulator's version has changed.
+    std::vector<ShaderDiskCachePrecompiledEntry> LoadPrecompiled();
+
+    /// Removes the precompiled cache file.
+    void InvalidatePrecompiled() const;
+
     /// Saves a raw dump to the transferable file. Checks for collisions.
     void SaveRaw(const ShaderDiskCacheRaw& entry);