4 files changed, 157 insertions, 72 deletions

diff --git a/src/video_core/engines/maxwell_3d.h b/src/video_core/engines/maxwell_3d.h
index dbd106c53..3c32f1067 100644
--- a/src/video_core/engines/maxwell_3d.h
+++ b/src/video_core/engines/maxwell_3d.h
@@ -487,7 +487,12 @@ public:
                     };
                 } rt_control;
 
-                INSERT_PADDING_WORDS(0x2B);
+                INSERT_PADDING_WORDS(0x2);
+
+                u32 zeta_width;
+                u32 zeta_height;
+
+                INSERT_PADDING_WORDS(0x27);
 
                 u32 depth_test_enable;
 
@@ -540,7 +545,11 @@ public:
 
                 u32 vb_element_base;
 
-                INSERT_PADDING_WORDS(0x49);
+                INSERT_PADDING_WORDS(0x40);
+
+                u32 zeta_enable;
+
+                INSERT_PADDING_WORDS(0x8);
 
                 struct {
                     u32 tsc_address_high;
@@ -865,6 +874,8 @@ ASSERT_REG_POSITION(clear_depth, 0x364);
 ASSERT_REG_POSITION(zeta, 0x3F8);
 ASSERT_REG_POSITION(vertex_attrib_format[0], 0x458);
 ASSERT_REG_POSITION(rt_control, 0x487);
+ASSERT_REG_POSITION(zeta_width, 0x48a);
+ASSERT_REG_POSITION(zeta_height, 0x48b);
 ASSERT_REG_POSITION(depth_test_enable, 0x4B3);
 ASSERT_REG_POSITION(independent_blend_enable, 0x4B9);
 ASSERT_REG_POSITION(depth_write_enabled, 0x4BA);
@@ -874,6 +885,7 @@ ASSERT_REG_POSITION(blend, 0x4CF);
 ASSERT_REG_POSITION(stencil, 0x4E0);
 ASSERT_REG_POSITION(screen_y_control, 0x4EB);
 ASSERT_REG_POSITION(vb_element_base, 0x50D);
+ASSERT_REG_POSITION(zeta_enable, 0x54E);
 ASSERT_REG_POSITION(tsc, 0x557);
 ASSERT_REG_POSITION(tic, 0x55D);
 ASSERT_REG_POSITION(stencil_two_side, 0x565);
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.cpp b/src/video_core/renderer_opengl/gl_rasterizer.cpp
index 65a2fd5e8..56d9c575b 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.cpp
+++ b/src/video_core/renderer_opengl/gl_rasterizer.cpp
@@ -387,7 +387,7 @@ void RasterizerOpenGL::Clear() {
     }
     if (regs.clear_buffers.Z) {
         clear_mask |= GL_DEPTH_BUFFER_BIT;
-        use_depth_fb = true;
+        use_depth_fb = regs.zeta_enable != 0;
 
         // Always enable the depth write when clearing the depth buffer. The depth write mask is
         // ignored when clearing the buffer in the Switch, but OpenGL obeys it so we set it to true.
@@ -413,11 +413,13 @@ void RasterizerOpenGL::Clear() {
     glClear(clear_mask);
 
     // Mark framebuffer surfaces as dirty
-    if (dirty_color_surface != nullptr) {
-        res_cache.MarkSurfaceAsDirty(dirty_color_surface);
-    }
-    if (dirty_depth_surface != nullptr) {
-        res_cache.MarkSurfaceAsDirty(dirty_depth_surface);
+    if (Settings::values.use_accurate_framebuffers) {
+        if (dirty_color_surface != nullptr) {
+            res_cache.FlushSurface(dirty_color_surface);
+        }
+        if (dirty_depth_surface != nullptr) {
+            res_cache.FlushSurface(dirty_depth_surface);
+        }
     }
 }
 
@@ -431,7 +433,7 @@ void RasterizerOpenGL::DrawArrays() {
     ScopeAcquireGLContext acquire_context;
 
     auto [dirty_color_surface, dirty_depth_surface] =
-        ConfigureFramebuffers(true, regs.zeta.Address() != 0);
+        ConfigureFramebuffers(true, regs.zeta.Address() != 0 && regs.zeta_enable != 0);
 
     SyncDepthTestState();
     SyncBlendState();
@@ -520,11 +522,13 @@ void RasterizerOpenGL::DrawArrays() {
     state.Apply();
 
     // Mark framebuffer surfaces as dirty
-    if (dirty_color_surface != nullptr) {
-        res_cache.MarkSurfaceAsDirty(dirty_color_surface);
-    }
-    if (dirty_depth_surface != nullptr) {
-        res_cache.MarkSurfaceAsDirty(dirty_depth_surface);
+    if (Settings::values.use_accurate_framebuffers) {
+        if (dirty_color_surface != nullptr) {
+            res_cache.FlushSurface(dirty_color_surface);
+        }
+        if (dirty_depth_surface != nullptr) {
+            res_cache.FlushSurface(dirty_depth_surface);
+        }
     }
 }
 
diff --git a/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp b/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp
index 2c43982b0..28f0bc379 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp
@@ -65,9 +65,9 @@ struct FormatTuple {
     return params;
 }
 
-/*static*/ SurfaceParams SurfaceParams::CreateForDepthBuffer(
-    const Tegra::Engines::Maxwell3D::Regs::RenderTargetConfig& config, Tegra::GPUVAddr zeta_address,
-    Tegra::DepthFormat format) {
+/*static*/ SurfaceParams SurfaceParams::CreateForDepthBuffer(u32 zeta_width, u32 zeta_height,
+                                                             Tegra::GPUVAddr zeta_address,
+                                                             Tegra::DepthFormat format) {
 
     SurfaceParams params{};
     params.addr = zeta_address;
@@ -77,9 +77,9 @@ struct FormatTuple {
     params.component_type = ComponentTypeFromDepthFormat(format);
     params.type = GetFormatType(params.pixel_format);
     params.size_in_bytes = params.SizeInBytes();
-    params.width = config.width;
-    params.height = config.height;
-    params.unaligned_height = config.height;
+    params.width = zeta_width;
+    params.height = zeta_height;
+    params.unaligned_height = zeta_height;
     params.size_in_bytes = params.SizeInBytes();
     return params;
 }
@@ -254,6 +254,60 @@ static void AllocateSurfaceTexture(GLuint texture, const FormatTuple& format_tup
     cur_state.Apply();
 }
 
+static bool BlitTextures(GLuint src_tex, const MathUtil::Rectangle<u32>& src_rect, GLuint dst_tex,
+                         const MathUtil::Rectangle<u32>& dst_rect, SurfaceType type,
+                         GLuint read_fb_handle, GLuint draw_fb_handle) {
+    OpenGLState prev_state{OpenGLState::GetCurState()};
+    SCOPE_EXIT({ prev_state.Apply(); });
+
+    OpenGLState state;
+    state.draw.read_framebuffer = read_fb_handle;
+    state.draw.draw_framebuffer = draw_fb_handle;
+    state.Apply();
+
+    u32 buffers{};
+
+    if (type == SurfaceType::ColorTexture) {
+        glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, src_tex,
+                               0);
+        glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_TEXTURE_2D, 0,
+                               0);
+
+        glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, dst_tex,
+                               0);
+        glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_TEXTURE_2D, 0,
+                               0);
+
+        buffers = GL_COLOR_BUFFER_BIT;
+    } else if (type == SurfaceType::Depth) {
+        glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0);
+        glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, src_tex, 0);
+        glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
+
+        glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0);
+        glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, dst_tex, 0);
+        glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
+
+        buffers = GL_DEPTH_BUFFER_BIT;
+    } else if (type == SurfaceType::DepthStencil) {
+        glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0);
+        glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_TEXTURE_2D,
+                               src_tex, 0);
+
+        glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0);
+        glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_TEXTURE_2D,
+                               dst_tex, 0);
+
+        buffers = GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT;
+    }
+
+    glBlitFramebuffer(src_rect.left, src_rect.bottom, src_rect.right, src_rect.top, dst_rect.left,
+                      dst_rect.bottom, dst_rect.right, dst_rect.top, buffers,
+                      buffers == GL_COLOR_BUFFER_BIT ? GL_LINEAR : GL_NEAREST);
+
+    return true;
+}
+
 CachedSurface::CachedSurface(const SurfaceParams& params) : params(params) {
     texture.Create();
     const auto& rect{params.GetRect()};
@@ -519,8 +573,8 @@ SurfaceSurfaceRect_Tuple RasterizerCacheOpenGL::GetFramebufferSurfaces(
     }
 
     if (using_depth_fb) {
-        depth_params =
-            SurfaceParams::CreateForDepthBuffer(regs.rt[0], regs.zeta.Address(), regs.zeta.format);
+        depth_params = SurfaceParams::CreateForDepthBuffer(regs.zeta_width, regs.zeta_height,
+                                                           regs.zeta.Address(), regs.zeta.format);
     }
 
     MathUtil::Rectangle<u32> color_rect{};
@@ -565,17 +619,9 @@ void RasterizerCacheOpenGL::LoadSurface(const Surface& surface) {
     surface->UploadGLTexture(read_framebuffer.handle, draw_framebuffer.handle);
 }
 
-void RasterizerCacheOpenGL::MarkSurfaceAsDirty(const Surface& surface) {
-    if (Settings::values.use_accurate_framebuffers) {
-        // If enabled, always flush dirty surfaces
-        surface->DownloadGLTexture(read_framebuffer.handle, draw_framebuffer.handle);
-        surface->FlushGLBuffer();
-    } else {
-        // Otherwise, don't mark surfaces that we write to as cached, because the resulting loads
-        // and flushes are very slow and do not seem to improve accuracy
-        const auto& params{surface->GetSurfaceParams()};
-        Memory::RasterizerMarkRegionCached(params.addr, params.size_in_bytes, false);
-    }
+void RasterizerCacheOpenGL::FlushSurface(const Surface& surface) {
+    surface->DownloadGLTexture(read_framebuffer.handle, draw_framebuffer.handle);
+    surface->FlushGLBuffer();
 }
 
 Surface RasterizerCacheOpenGL::GetSurface(const SurfaceParams& params) {
@@ -588,25 +634,53 @@ Surface RasterizerCacheOpenGL::GetSurface(const SurfaceParams& params) {
     if (gpu.memory_manager->GpuToCpuAddress(params.addr) == boost::none)
         return {};
 
-    // Check for an exact match in existing surfaces
-    const auto& surface_key{SurfaceKey::Create(params)};
-    const auto& search{surface_cache.find(surface_key)};
+    // Look up surface in the cache based on address
+    const auto& search{surface_cache.find(params.addr)};
     Surface surface;
     if (search != surface_cache.end()) {
         surface = search->second;
         if (Settings::values.use_accurate_framebuffers) {
-            // Reload the surface from Switch memory
-            LoadSurface(surface);
+            // If use_accurate_framebuffers is enabled, always load from memory
+            FlushSurface(surface);
+            UnregisterSurface(surface);
+        } else if (surface->GetSurfaceParams() != params) {
+            // If surface parameters changed, recreate the surface from the old one
+            return RecreateSurface(surface, params);
+        } else {
+            // Use the cached surface as-is
+            return surface;
         }
-    } else {
-        surface = std::make_shared<CachedSurface>(params);
-        RegisterSurface(surface);
-        LoadSurface(surface);
     }
 
+    // No surface found - create a new one
+    surface = std::make_shared<CachedSurface>(params);
+    RegisterSurface(surface);
+    LoadSurface(surface);
+
     return surface;
 }
 
+Surface RasterizerCacheOpenGL::RecreateSurface(const Surface& surface,
+                                               const SurfaceParams& new_params) {
+    // Verify surface is compatible for blitting
+    const auto& params{surface->GetSurfaceParams()};
+    ASSERT(params.type == new_params.type);
+    ASSERT(params.pixel_format == new_params.pixel_format);
+    ASSERT(params.component_type == new_params.component_type);
+
+    // Create a new surface with the new parameters, and blit the previous surface to it
+    Surface new_surface{std::make_shared<CachedSurface>(new_params)};
+    BlitTextures(surface->Texture().handle, params.GetRect(), new_surface->Texture().handle,
+                 new_surface->GetSurfaceParams().GetRect(), params.type, read_framebuffer.handle,
+                 draw_framebuffer.handle);
+
+    // Update cache accordingly
+    UnregisterSurface(surface);
+    RegisterSurface(new_surface);
+
+    return new_surface;
+}
+
 Surface RasterizerCacheOpenGL::TryFindFramebufferSurface(VAddr cpu_addr) const {
     // Tries to find the GPU address of a framebuffer based on the CPU address. This is because
     // final output framebuffers are specified by CPU address, but internally our GPU cache uses
@@ -652,22 +726,20 @@ void RasterizerCacheOpenGL::InvalidateRegion(Tegra::GPUVAddr addr, size_t size)
 
 void RasterizerCacheOpenGL::RegisterSurface(const Surface& surface) {
     const auto& params{surface->GetSurfaceParams()};
-    const auto& surface_key{SurfaceKey::Create(params)};
-    const auto& search{surface_cache.find(surface_key)};
+    const auto& search{surface_cache.find(params.addr)};
 
     if (search != surface_cache.end()) {
         // Registered already
         return;
     }
 
-    surface_cache[surface_key] = surface;
+    surface_cache[params.addr] = surface;
     UpdatePagesCachedCount(params.addr, params.size_in_bytes, 1);
 }
 
 void RasterizerCacheOpenGL::UnregisterSurface(const Surface& surface) {
     const auto& params{surface->GetSurfaceParams()};
-    const auto& surface_key{SurfaceKey::Create(params)};
-    const auto& search{surface_cache.find(surface_key)};
+    const auto& search{surface_cache.find(params.addr)};
 
     if (search == surface_cache.end()) {
         // Unregistered already
diff --git a/src/video_core/renderer_opengl/gl_rasterizer_cache.h b/src/video_core/renderer_opengl/gl_rasterizer_cache.h
index 718c45ce1..b084c4db4 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer_cache.h
+++ b/src/video_core/renderer_opengl/gl_rasterizer_cache.h
@@ -10,7 +10,6 @@
 #include <vector>
 #include <boost/icl/interval_map.hpp>
 #include "common/common_types.h"
-#include "common/hash.h"
 #include "common/math_util.h"
 #include "video_core/engines/maxwell_3d.h"
 #include "video_core/renderer_opengl/gl_resource_manager.h"
@@ -137,6 +136,7 @@ struct SurfaceParams {
         ASSERT(static_cast<size_t>(format) < bpp_table.size());
         return bpp_table[static_cast<size_t>(format)];
     }
+
     u32 GetFormatBpp() const {
         return GetFormatBpp(pixel_format);
     }
@@ -365,9 +365,21 @@ struct SurfaceParams {
         const Tegra::Engines::Maxwell3D::Regs::RenderTargetConfig& config);
 
     /// Creates SurfaceParams for a depth buffer configuration
-    static SurfaceParams CreateForDepthBuffer(
-        const Tegra::Engines::Maxwell3D::Regs::RenderTargetConfig& config,
-        Tegra::GPUVAddr zeta_address, Tegra::DepthFormat format);
+    static SurfaceParams CreateForDepthBuffer(u32 zeta_width, u32 zeta_height,
+                                              Tegra::GPUVAddr zeta_address,
+                                              Tegra::DepthFormat format);
+
+    bool operator==(const SurfaceParams& other) const {
+        return std::tie(addr, is_tiled, block_height, pixel_format, component_type, type, width,
+                        height, unaligned_height, size_in_bytes) ==
+               std::tie(other.addr, other.is_tiled, other.block_height, other.pixel_format,
+                        other.component_type, other.type, other.width, other.height,
+                        other.unaligned_height, other.size_in_bytes);
+    }
+
+    bool operator!=(const SurfaceParams& other) const {
+        return !operator==(other);
+    }
 
     Tegra::GPUVAddr addr;
     bool is_tiled;
@@ -381,24 +393,6 @@ struct SurfaceParams {
     size_t size_in_bytes;
 };
 
-/// Hashable variation of SurfaceParams, used for a key in the surface cache
-struct SurfaceKey : Common::HashableStruct<SurfaceParams> {
-    static SurfaceKey Create(const SurfaceParams& params) {
-        SurfaceKey res;
-        res.state = params;
-        return res;
-    }
-};
-
-namespace std {
-template <>
-struct hash<SurfaceKey> {
-    size_t operator()(const SurfaceKey& k) const {
-        return k.Hash();
-    }
-};
-} // namespace std
-
 class CachedSurface final {
 public:
     CachedSurface(const SurfaceParams& params);
@@ -444,8 +438,8 @@ public:
     SurfaceSurfaceRect_Tuple GetFramebufferSurfaces(bool using_color_fb, bool using_depth_fb,
                                                     const MathUtil::Rectangle<s32>& viewport);
 
-    /// Marks the specified surface as "dirty", in that it is out of sync with Switch memory
-    void MarkSurfaceAsDirty(const Surface& surface);
+    /// Flushes the surface to Switch memory
+    void FlushSurface(const Surface& surface);
 
     /// Tries to find a framebuffer GPU address based on the provided CPU address
     Surface TryFindFramebufferSurface(VAddr cpu_addr) const;
@@ -460,6 +454,9 @@ private:
     void LoadSurface(const Surface& surface);
     Surface GetSurface(const SurfaceParams& params);
 
+    /// Recreates a surface with new parameters
+    Surface RecreateSurface(const Surface& surface, const SurfaceParams& new_params);
+
     /// Register surface into the cache
     void RegisterSurface(const Surface& surface);
 
@@ -469,7 +466,7 @@ private:
     /// Increase/decrease the number of surface in pages touching the specified region
     void UpdatePagesCachedCount(Tegra::GPUVAddr addr, u64 size, int delta);
 
-    std::unordered_map<SurfaceKey, Surface> surface_cache;
+    std::unordered_map<Tegra::GPUVAddr, Surface> surface_cache;
     PageMap cached_pages;
 
     OGLFramebuffer read_framebuffer;