buffer_cache: Avoid passing references of shared pointers and misc style changes

Instead of using as template argument a shared pointer, use the
underlying type and manage shared pointers explicitly. This can make
removing shared pointers from the cache more easy.

While we are at it, make some misc style changes and general
improvements (like insert_or_assign instead of operator[] + operator=).

src/video_core/renderer_opengl/gl_buffer_cache.cpp

@@ -22,13 +22,12 @@ using Maxwell = Tegra::Engines::Maxwell3D::Regs;
 
 MICROPROFILE_DEFINE(OpenGL_Buffer_Download, "OpenGL", "Buffer Download", MP_RGB(192, 192, 128));
 
-CachedBufferBlock::CachedBufferBlock(VAddr cpu_addr, const std::size_t size)
-    : VideoCommon::BufferBlock{cpu_addr, size} {
+Buffer::Buffer(VAddr cpu_addr, const std::size_t size) : VideoCommon::BufferBlock{cpu_addr, size} {
     gl_buffer.Create();
     glNamedBufferData(gl_buffer.handle, static_cast<GLsizeiptr>(size), nullptr, GL_DYNAMIC_DRAW);
 }
 
-CachedBufferBlock::~CachedBufferBlock() = default;
+Buffer::~Buffer() = default;
 
 OGLBufferCache::OGLBufferCache(RasterizerOpenGL& rasterizer, Core::System& system,
                                const Device& device, std::size_t stream_size)
@@ -48,12 +47,8 @@ OGLBufferCache::~OGLBufferCache() {
     glDeleteBuffers(static_cast<GLsizei>(std::size(cbufs)), std::data(cbufs));
 }
 
-Buffer OGLBufferCache::CreateBlock(VAddr cpu_addr, std::size_t size) {
-    return std::make_shared<CachedBufferBlock>(cpu_addr, size);
-}
-
-GLuint OGLBufferCache::ToHandle(const Buffer& buffer) {
-    return buffer->GetHandle();
+std::shared_ptr<Buffer> OGLBufferCache::CreateBlock(VAddr cpu_addr, std::size_t size) {
+    return std::make_shared<Buffer>(cpu_addr, size);
 }
 
 GLuint OGLBufferCache::GetEmptyBuffer(std::size_t) {
@@ -62,7 +57,7 @@ GLuint OGLBufferCache::GetEmptyBuffer(std::size_t) {
 
 void OGLBufferCache::UploadBlockData(const Buffer& buffer, std::size_t offset, std::size_t size,
                                      const u8* data) {
-    glNamedBufferSubData(buffer->GetHandle(), static_cast<GLintptr>(offset),
+    glNamedBufferSubData(buffer.Handle(), static_cast<GLintptr>(offset),
                          static_cast<GLsizeiptr>(size), data);
 }
 
@@ -70,20 +65,20 @@ void OGLBufferCache::DownloadBlockData(const Buffer& buffer, std::size_t offset,
                                        u8* data) {
     MICROPROFILE_SCOPE(OpenGL_Buffer_Download);
     glMemoryBarrier(GL_BUFFER_UPDATE_BARRIER_BIT);
-    glGetNamedBufferSubData(buffer->GetHandle(), static_cast<GLintptr>(offset),
+    glGetNamedBufferSubData(buffer.Handle(), static_cast<GLintptr>(offset),
                             static_cast<GLsizeiptr>(size), data);
 }
 
 void OGLBufferCache::CopyBlock(const Buffer& src, const Buffer& dst, std::size_t src_offset,
                                std::size_t dst_offset, std::size_t size) {
-    glCopyNamedBufferSubData(src->GetHandle(), dst->GetHandle(), static_cast<GLintptr>(src_offset),
+    glCopyNamedBufferSubData(src.Handle(), dst.Handle(), static_cast<GLintptr>(src_offset),
                              static_cast<GLintptr>(dst_offset), static_cast<GLsizeiptr>(size));
 }
 
 OGLBufferCache::BufferInfo OGLBufferCache::ConstBufferUpload(const void* raw_pointer,
                                                              std::size_t size) {
     DEBUG_ASSERT(cbuf_cursor < std::size(cbufs));
-    const GLuint& cbuf = cbufs[cbuf_cursor++];
+    const GLuint cbuf = cbufs[cbuf_cursor++];
     glNamedBufferSubData(cbuf, 0, static_cast<GLsizeiptr>(size), raw_pointer);
     return {cbuf, 0};
 }

src/video_core/renderer_opengl/gl_buffer_cache.h

@@ -24,17 +24,12 @@ class Device;
 class OGLStreamBuffer;
 class RasterizerOpenGL;
 
-class CachedBufferBlock;
-
-using Buffer = std::shared_ptr<CachedBufferBlock>;
-using GenericBufferCache = VideoCommon::BufferCache<Buffer, GLuint, OGLStreamBuffer>;
-
-class CachedBufferBlock : public VideoCommon::BufferBlock {
+class Buffer : public VideoCommon::BufferBlock {
 public:
-    explicit CachedBufferBlock(VAddr cpu_addr, const std::size_t size);
-    ~CachedBufferBlock();
+    explicit Buffer(VAddr cpu_addr, const std::size_t size);
+    ~Buffer();
 
-    GLuint GetHandle() const {
+    GLuint Handle() const {
         return gl_buffer.handle;
     }
 
@@ -42,6 +37,7 @@ private:
     OGLBuffer gl_buffer;
 };
 
+using GenericBufferCache = VideoCommon::BufferCache<Buffer, GLuint, OGLStreamBuffer>;
 class OGLBufferCache final : public GenericBufferCache {
 public:
     explicit OGLBufferCache(RasterizerOpenGL& rasterizer, Core::System& system,
@@ -55,9 +51,7 @@ public:
     }
 
 protected:
-    Buffer CreateBlock(VAddr cpu_addr, std::size_t size) override;
-
-    GLuint ToHandle(const Buffer& buffer) override;
+    std::shared_ptr<Buffer> CreateBlock(VAddr cpu_addr, std::size_t size) override;
 
     void UploadBlockData(const Buffer& buffer, std::size_t offset, std::size_t size,
                          const u8* data) override;

src/video_core/renderer_opengl/gl_stream_buffer.cpp

@@ -49,14 +49,6 @@ OGLStreamBuffer::~OGLStreamBuffer() {
     gl_buffer.Release();
 }
 
-GLuint OGLStreamBuffer::GetHandle() const {
-    return gl_buffer.handle;
-}
-
-GLsizeiptr OGLStreamBuffer::GetSize() const {
-    return buffer_size;
-}
-
 std::tuple<u8*, GLintptr, bool> OGLStreamBuffer::Map(GLsizeiptr size, GLintptr alignment) {
     ASSERT(size <= buffer_size);
     ASSERT(alignment <= buffer_size);

src/video_core/renderer_opengl/gl_stream_buffer.h

@@ -17,9 +17,6 @@ public:
                              bool use_persistent = true);
     ~OGLStreamBuffer();
 
-    GLuint GetHandle() const;
-    GLsizeiptr GetSize() const;
-
     /*
      * Allocates a linear chunk of memory in the GPU buffer with at least "size" bytes
      * and the optional alignment requirement.
@@ -32,6 +29,14 @@ public:
 
     void Unmap(GLsizeiptr size);
 
+    GLuint Handle() const {
+        return gl_buffer.handle;
+    }
+
+    GLsizeiptr Size() const {
+        return buffer_size;
+    }
+
 private:
     OGLBuffer gl_buffer;