1 files changed, 73 insertions, 0 deletions

diff --git a/src/video_core/renderer_opengl/gl_framebuffer_cache.cpp b/src/video_core/renderer_opengl/gl_framebuffer_cache.cpp
new file mode 100644
index 000000000..bb9f9b81f
--- /dev/null
+++ b/src/video_core/renderer_opengl/gl_framebuffer_cache.cpp
@@ -0,0 +1,73 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <tuple>
+
+#include "common/cityhash.h"
+#include "common/scope_exit.h"
+#include "video_core/engines/maxwell_3d.h"
+#include "video_core/renderer_opengl/gl_framebuffer_cache.h"
+#include "video_core/renderer_opengl/gl_state.h"
+
+namespace OpenGL {
+
+using Maxwell = Tegra::Engines::Maxwell3D::Regs;
+
+FramebufferCacheOpenGL::FramebufferCacheOpenGL() = default;
+
+FramebufferCacheOpenGL::~FramebufferCacheOpenGL() = default;
+
+GLuint FramebufferCacheOpenGL::GetFramebuffer(const FramebufferCacheKey& key) {
+    const auto [entry, is_cache_miss] = cache.try_emplace(key);
+    auto& framebuffer{entry->second};
+    if (is_cache_miss) {
+        framebuffer = CreateFramebuffer(key);
+    }
+    return framebuffer.handle;
+}
+
+OGLFramebuffer FramebufferCacheOpenGL::CreateFramebuffer(const FramebufferCacheKey& key) {
+    OGLFramebuffer framebuffer;
+    framebuffer.Create();
+
+    // TODO(Rodrigo): Use DSA here after Nvidia fixes their framebuffer DSA bugs.
+    local_state.draw.draw_framebuffer = framebuffer.handle;
+    local_state.ApplyFramebufferState();
+
+    if (key.is_single_buffer) {
+        if (key.color_attachments[0] != GL_NONE && key.colors[0]) {
+            key.colors[0]->Attach(key.color_attachments[0]);
+            glDrawBuffer(key.color_attachments[0]);
+        } else {
+            glDrawBuffer(GL_NONE);
+        }
+    } else {
+        for (std::size_t index = 0; index < Maxwell::NumRenderTargets; ++index) {
+            if (key.colors[index]) {
+                key.colors[index]->Attach(GL_COLOR_ATTACHMENT0 + static_cast<GLenum>(index));
+            }
+        }
+        glDrawBuffers(key.colors_count, key.color_attachments.data());
+    }
+
+    if (key.zeta) {
+        key.zeta->Attach(key.stencil_enable ? GL_DEPTH_STENCIL_ATTACHMENT : GL_DEPTH_ATTACHMENT);
+    }
+
+    return framebuffer;
+}
+
+std::size_t FramebufferCacheKey::Hash() const {
+    static_assert(sizeof(*this) % sizeof(u64) == 0, "Unaligned struct");
+    return static_cast<std::size_t>(
+        Common::CityHash64(reinterpret_cast<const char*>(this), sizeof(*this)));
+}
+
+bool FramebufferCacheKey::operator==(const FramebufferCacheKey& rhs) const {
+    return std::tie(is_single_buffer, stencil_enable, colors_count, color_attachments, colors,
+                    zeta) == std::tie(rhs.is_single_buffer, rhs.stencil_enable, rhs.colors_count,
+                                      rhs.color_attachments, rhs.colors, rhs.zeta);
+}
+
+} // namespace OpenGL