renderer_opengl: implement layer stack composition

src/video_core/CMakeLists.txt

@@ -122,6 +122,9 @@ add_library(video_core STATIC
     renderer_opengl/present/fsr.h
     renderer_opengl/present/fxaa.cpp
     renderer_opengl/present/fxaa.h
+    renderer_opengl/present/layer.cpp
+    renderer_opengl/present/layer.h
+    renderer_opengl/present/present_uniforms.h
     renderer_opengl/present/smaa.cpp
     renderer_opengl/present/smaa.h
     renderer_opengl/present/util.h

src/video_core/renderer_opengl/gl_blit_screen.cpp

@@ -1,18 +1,12 @@
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-#include "video_core/framebuffer_config.h"
+#include "common/settings.h"
 #include "video_core/renderer_opengl/gl_blit_screen.h"
-#include "video_core/renderer_opengl/gl_rasterizer.h"
-#include "video_core/renderer_opengl/gl_shader_manager.h"
-#include "video_core/renderer_opengl/gl_shader_util.h"
 #include "video_core/renderer_opengl/gl_state_tracker.h"
 #include "video_core/renderer_opengl/present/filters.h"
-#include "video_core/renderer_opengl/present/fsr.h"
-#include "video_core/renderer_opengl/present/fxaa.h"
-#include "video_core/renderer_opengl/present/smaa.h"
+#include "video_core/renderer_opengl/present/layer.h"
 #include "video_core/renderer_opengl/present/window_adapt_pass.h"
-#include "video_core/textures/decoders.h"
 
 namespace OpenGL {
 
@@ -21,130 +15,12 @@ BlitScreen::BlitScreen(RasterizerOpenGL& rasterizer_,
                        StateTracker& state_tracker_, ProgramManager& program_manager_,
                        Device& device_)
     : rasterizer(rasterizer_), device_memory(device_memory_), state_tracker(state_tracker_),
-      program_manager(program_manager_), device(device_) {
-    // Allocate textures for the screen
-    framebuffer_texture.resource.Create(GL_TEXTURE_2D);
-
-    const GLuint texture = framebuffer_texture.resource.handle;
-    glTextureStorage2D(texture, 1, GL_RGBA8, 1, 1);
-
-    // Clear screen to black
-    const u8 framebuffer_data[4] = {0, 0, 0, 0};
-    glClearTexImage(framebuffer_texture.resource.handle, 0, GL_RGBA, GL_UNSIGNED_BYTE,
-                    framebuffer_data);
-}
+      program_manager(program_manager_), device(device_) {}
 
 BlitScreen::~BlitScreen() = default;
 
-FramebufferTextureInfo BlitScreen::PrepareRenderTarget(
-    const Tegra::FramebufferConfig& framebuffer) {
-    // If framebuffer is provided, reload it from memory to a texture
-    if (framebuffer_texture.width != static_cast<GLsizei>(framebuffer.width) ||
-        framebuffer_texture.height != static_cast<GLsizei>(framebuffer.height) ||
-        framebuffer_texture.pixel_format != framebuffer.pixel_format ||
-        gl_framebuffer_data.empty()) {
-        // Reallocate texture if the framebuffer size has changed.
-        // This is expected to not happen very often and hence should not be a
-        // performance problem.
-        ConfigureFramebufferTexture(framebuffer);
-    }
-
-    // Load the framebuffer from memory if needed
-    return LoadFBToScreenInfo(framebuffer);
-}
-
-FramebufferTextureInfo BlitScreen::LoadFBToScreenInfo(const Tegra::FramebufferConfig& framebuffer) {
-    const DAddr framebuffer_addr{framebuffer.address + framebuffer.offset};
-    const auto accelerated_info =
-        rasterizer.AccelerateDisplay(framebuffer, framebuffer_addr, framebuffer.stride);
-    if (accelerated_info) {
-        return *accelerated_info;
-    }
-
-    // Reset the screen info's display texture to its own permanent texture
-    FramebufferTextureInfo info{};
-    info.display_texture = framebuffer_texture.resource.handle;
-    info.width = framebuffer.width;
-    info.height = framebuffer.height;
-    info.scaled_width = framebuffer.width;
-    info.scaled_height = framebuffer.height;
-
-    // TODO(Rodrigo): Read this from HLE
-    constexpr u32 block_height_log2 = 4;
-    const auto pixel_format{
-        VideoCore::Surface::PixelFormatFromGPUPixelFormat(framebuffer.pixel_format)};
-    const u32 bytes_per_pixel{VideoCore::Surface::BytesPerBlock(pixel_format)};
-    const u64 size_in_bytes{Tegra::Texture::CalculateSize(
-        true, bytes_per_pixel, framebuffer.stride, framebuffer.height, 1, block_height_log2, 0)};
-    const u8* const host_ptr{device_memory.GetPointer<u8>(framebuffer_addr)};
-    const std::span<const u8> input_data(host_ptr, size_in_bytes);
-    Tegra::Texture::UnswizzleTexture(gl_framebuffer_data, input_data, bytes_per_pixel,
-                                     framebuffer.width, framebuffer.height, 1, block_height_log2,
-                                     0);
-
-    glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
-    glPixelStorei(GL_UNPACK_ROW_LENGTH, static_cast<GLint>(framebuffer.stride));
-
-    // Update existing texture
-    // TODO: Test what happens on hardware when you change the framebuffer dimensions so that
-    //       they differ from the LCD resolution.
-    // TODO: Applications could theoretically crash yuzu here by specifying too large
-    //       framebuffer sizes. We should make sure that this cannot happen.
-    glTextureSubImage2D(framebuffer_texture.resource.handle, 0, 0, 0, framebuffer.width,
-                        framebuffer.height, framebuffer_texture.gl_format,
-                        framebuffer_texture.gl_type, gl_framebuffer_data.data());
-
-    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
-
-    return info;
-}
-
-void BlitScreen::ConfigureFramebufferTexture(const Tegra::FramebufferConfig& framebuffer) {
-    framebuffer_texture.width = framebuffer.width;
-    framebuffer_texture.height = framebuffer.height;
-    framebuffer_texture.pixel_format = framebuffer.pixel_format;
-
-    const auto pixel_format{
-        VideoCore::Surface::PixelFormatFromGPUPixelFormat(framebuffer.pixel_format)};
-    const u32 bytes_per_pixel{VideoCore::Surface::BytesPerBlock(pixel_format)};
-    gl_framebuffer_data.resize(framebuffer_texture.width * framebuffer_texture.height *
-                               bytes_per_pixel);
-
-    GLint internal_format;
-    switch (framebuffer.pixel_format) {
-    case Service::android::PixelFormat::Rgba8888:
-        internal_format = GL_RGBA8;
-        framebuffer_texture.gl_format = GL_RGBA;
-        framebuffer_texture.gl_type = GL_UNSIGNED_INT_8_8_8_8_REV;
-        break;
-    case Service::android::PixelFormat::Rgb565:
-        internal_format = GL_RGB565;
-        framebuffer_texture.gl_format = GL_RGB;
-        framebuffer_texture.gl_type = GL_UNSIGNED_SHORT_5_6_5;
-        break;
-    default:
-        internal_format = GL_RGBA8;
-        framebuffer_texture.gl_format = GL_RGBA;
-        framebuffer_texture.gl_type = GL_UNSIGNED_INT_8_8_8_8_REV;
-        // UNIMPLEMENTED_MSG("Unknown framebuffer pixel format: {}",
-        //                   static_cast<u32>(framebuffer.pixel_format));
-        break;
-    }
-
-    framebuffer_texture.resource.Release();
-    framebuffer_texture.resource.Create(GL_TEXTURE_2D);
-    glTextureStorage2D(framebuffer_texture.resource.handle, 1, internal_format,
-                       framebuffer_texture.width, framebuffer_texture.height);
-
-    fxaa.reset();
-    smaa.reset();
-}
-
-void BlitScreen::DrawScreen(const Tegra::FramebufferConfig& framebuffer,
+void BlitScreen::DrawScreen(std::span<const Tegra::FramebufferConfig> framebuffers,
                             const Layout::FramebufferLayout& layout) {
-    FramebufferTextureInfo info = PrepareRenderTarget(framebuffer);
-    auto crop = Tegra::NormalizeCrop(framebuffer, info.width, info.height);
-
     // TODO: Signal state tracker about these changes
     state_tracker.NotifyScreenDrawVertexArray();
     state_tracker.NotifyPolygonModes();
@@ -163,7 +39,6 @@ void BlitScreen::DrawScreen(const Tegra::FramebufferConfig& framebuffer,
     state_tracker.NotifyLogicOp();
     state_tracker.NotifyClipControl();
     state_tracker.NotifyAlphaTest();
-
     state_tracker.ClipControl(GL_LOWER_LEFT, GL_ZERO_TO_ONE);
 
     glEnable(GL_CULL_FACE);
@@ -180,76 +55,17 @@ void BlitScreen::DrawScreen(const Tegra::FramebufferConfig& framebuffer,
     glColorMaski(0, GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
     glDepthRangeIndexed(0, 0.0, 0.0);
 
-    GLint old_read_fb;
-    GLint old_draw_fb;
-    glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &old_read_fb);
-    glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &old_draw_fb);
-
-    GLuint texture = info.display_texture;
-
-    auto anti_aliasing = Settings::values.anti_aliasing.GetValue();
-    if (anti_aliasing != Settings::AntiAliasing::None) {
-        glEnablei(GL_SCISSOR_TEST, 0);
-        auto scissor_width = Settings::values.resolution_info.ScaleUp(framebuffer_texture.width);
-        auto viewport_width = static_cast<GLfloat>(scissor_width);
-        auto scissor_height = Settings::values.resolution_info.ScaleUp(framebuffer_texture.height);
-        auto viewport_height = static_cast<GLfloat>(scissor_height);
-
-        glScissorIndexed(0, 0, 0, scissor_width, scissor_height);
-        glViewportIndexedf(0, 0.0f, 0.0f, viewport_width, viewport_height);
-
-        switch (anti_aliasing) {
-        case Settings::AntiAliasing::Fxaa:
-            CreateFXAA();
-            texture = fxaa->Draw(program_manager, info.display_texture);
-            break;
-        case Settings::AntiAliasing::Smaa:
-        default:
-            CreateSMAA();
-            texture = smaa->Draw(program_manager, info.display_texture);
-            break;
-        }
-    }
-
-    glDisablei(GL_SCISSOR_TEST, 0);
-
-    if (Settings::values.scaling_filter.GetValue() == Settings::ScalingFilter::Fsr) {
-        if (!fsr || fsr->NeedsRecreation(layout.screen)) {
-            fsr = std::make_unique<FSR>(layout.screen.GetWidth(), layout.screen.GetHeight());
+    while (layers.size() < framebuffers.size()) {
+        layers.emplace_back(rasterizer, device_memory);
     }
 
-        texture = fsr->Draw(program_manager, texture, info.scaled_width, info.scaled_height, crop);
-        crop = {0, 0, 1, 1};
-    }
-
-    glBindFramebuffer(GL_READ_FRAMEBUFFER, old_read_fb);
-    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, old_draw_fb);
-
     CreateWindowAdapt();
-    window_adapt->DrawToFramebuffer(program_manager, texture, layout, crop);
+    window_adapt->DrawToFramebuffer(program_manager, layers, framebuffers, layout);
 
     // TODO
     // program_manager.RestoreGuestPipeline();
 }
 
-void BlitScreen::CreateFXAA() {
-    smaa.reset();
-    if (!fxaa) {
-        fxaa = std::make_unique<FXAA>(
-            Settings::values.resolution_info.ScaleUp(framebuffer_texture.width),
-            Settings::values.resolution_info.ScaleUp(framebuffer_texture.height));
-    }
-}
-
-void BlitScreen::CreateSMAA() {
-    fxaa.reset();
-    if (!smaa) {
-        smaa = std::make_unique<SMAA>(
-            Settings::values.resolution_info.ScaleUp(framebuffer_texture.width),
-            Settings::values.resolution_info.ScaleUp(framebuffer_texture.height));
-    }
-}
-
 void BlitScreen::CreateWindowAdapt() {
     if (window_adapt && Settings::values.scaling_filter.GetValue() == current_window_adapt) {
         return;

src/video_core/renderer_opengl/gl_blit_screen.h

@@ -3,8 +3,9 @@
 
 #pragma once
 
+#include <list>
 #include <memory>
-#include <vector>
+#include <span>
 
 #include "core/hle/service/nvnflinger/pixel_format.h"
 #include "video_core/host1x/gpu_device_memory_manager.h"
@@ -25,24 +26,12 @@ enum class ScalingFilter : u32;
 namespace OpenGL {
 
 class Device;
-class FSR;
-class FXAA;
+class Layer;
 class ProgramManager;
 class RasterizerOpenGL;
-class SMAA;
 class StateTracker;
 class WindowAdaptPass;
 
-/// Structure used for storing information about the textures for the Switch screen
-struct TextureInfo {
-    OGLTexture resource;
-    GLsizei width;
-    GLsizei height;
-    GLenum gl_format;
-    GLenum gl_type;
-    Service::android::PixelFormat pixel_format;
-};
-
 /// Structure used for storing information about the display target for the Switch screen
 struct FramebufferTextureInfo {
     GLuint display_texture{};
@@ -60,20 +49,11 @@ public:
                         Device& device);
     ~BlitScreen();
 
-    void ConfigureFramebufferTexture(const Tegra::FramebufferConfig& framebuffer);
-
     /// Draws the emulated screens to the emulator window.
-    void DrawScreen(const Tegra::FramebufferConfig& framebuffer,
+    void DrawScreen(std::span<const Tegra::FramebufferConfig> framebuffers,
                     const Layout::FramebufferLayout& layout);
 
-    /// Loads framebuffer from emulated memory into the active OpenGL texture.
-    FramebufferTextureInfo LoadFBToScreenInfo(const Tegra::FramebufferConfig& framebuffer);
-
-    FramebufferTextureInfo PrepareRenderTarget(const Tegra::FramebufferConfig& framebuffer);
-
 private:
-    void CreateFXAA();
-    void CreateSMAA();
     void CreateWindowAdapt();
 
     RasterizerOpenGL& rasterizer;
@@ -82,18 +62,10 @@ private:
     ProgramManager& program_manager;
     Device& device;
 
-    /// Display information for Switch screen
-    TextureInfo framebuffer_texture;
-
-    std::unique_ptr<FSR> fsr;
-    std::unique_ptr<FXAA> fxaa;
-    std::unique_ptr<SMAA> smaa;
-
     Settings::ScalingFilter current_window_adapt{};
     std::unique_ptr<WindowAdaptPass> window_adapt;
 
-    /// OpenGL framebuffer data
-    std::vector<u8> gl_framebuffer_data;
+    std::list<Layer> layers;
 };
 
 } // namespace OpenGL

src/video_core/renderer_opengl/present/layer.cpp

@@ -0,0 +1,215 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "video_core/framebuffer_config.h"
+#include "video_core/renderer_opengl/gl_blit_screen.h"
+#include "video_core/renderer_opengl/gl_rasterizer.h"
+#include "video_core/renderer_opengl/present/fsr.h"
+#include "video_core/renderer_opengl/present/fxaa.h"
+#include "video_core/renderer_opengl/present/layer.h"
+#include "video_core/renderer_opengl/present/present_uniforms.h"
+#include "video_core/renderer_opengl/present/smaa.h"
+#include "video_core/surface.h"
+#include "video_core/textures/decoders.h"
+
+namespace OpenGL {
+
+Layer::Layer(RasterizerOpenGL& rasterizer_, Tegra::MaxwellDeviceMemoryManager& device_memory_)
+    : rasterizer(rasterizer_), device_memory(device_memory_) {
+    // Allocate textures for the screen
+    framebuffer_texture.resource.Create(GL_TEXTURE_2D);
+
+    const GLuint texture = framebuffer_texture.resource.handle;
+    glTextureStorage2D(texture, 1, GL_RGBA8, 1, 1);
+
+    // Clear screen to black
+    const u8 framebuffer_data[4] = {0, 0, 0, 0};
+    glClearTexImage(framebuffer_texture.resource.handle, 0, GL_RGBA, GL_UNSIGNED_BYTE,
+                    framebuffer_data);
+}
+
+Layer::~Layer() = default;
+
+GLuint Layer::ConfigureDraw(std::array<GLfloat, 3 * 2>& out_matrix,
+                            std::array<ScreenRectVertex, 4>& out_vertices,
+                            ProgramManager& program_manager,
+                            const Tegra::FramebufferConfig& framebuffer,
+                            const Layout::FramebufferLayout& layout) {
+    FramebufferTextureInfo info = PrepareRenderTarget(framebuffer);
+    auto crop = Tegra::NormalizeCrop(framebuffer, info.width, info.height);
+    GLuint texture = info.display_texture;
+
+    auto anti_aliasing = Settings::values.anti_aliasing.GetValue();
+    if (anti_aliasing != Settings::AntiAliasing::None) {
+        glEnablei(GL_SCISSOR_TEST, 0);
+        auto viewport_width = Settings::values.resolution_info.ScaleUp(framebuffer_texture.width);
+        auto viewport_height = Settings::values.resolution_info.ScaleUp(framebuffer_texture.height);
+
+        glScissorIndexed(0, 0, 0, viewport_width, viewport_height);
+        glViewportIndexedf(0, 0.0f, 0.0f, static_cast<GLfloat>(viewport_width),
+                           static_cast<GLfloat>(viewport_height));
+
+        switch (anti_aliasing) {
+        case Settings::AntiAliasing::Fxaa:
+            CreateFXAA();
+            texture = fxaa->Draw(program_manager, info.display_texture);
+            break;
+        case Settings::AntiAliasing::Smaa:
+        default:
+            CreateSMAA();
+            texture = smaa->Draw(program_manager, info.display_texture);
+            break;
+        }
+    }
+
+    glDisablei(GL_SCISSOR_TEST, 0);
+
+    if (Settings::values.scaling_filter.GetValue() == Settings::ScalingFilter::Fsr) {
+        if (!fsr || fsr->NeedsRecreation(layout.screen)) {
+            fsr = std::make_unique<FSR>(layout.screen.GetWidth(), layout.screen.GetHeight());
+        }
+
+        texture = fsr->Draw(program_manager, texture, info.scaled_width, info.scaled_height, crop);
+        crop = {0, 0, 1, 1};
+    }
+
+    out_matrix =
+        MakeOrthographicMatrix(static_cast<float>(layout.width), static_cast<float>(layout.height));
+
+    // Map the coordinates to the screen.
+    const auto& screen = layout.screen;
+    const auto x = screen.left;
+    const auto y = screen.top;
+    const auto w = screen.GetWidth();
+    const auto h = screen.GetHeight();
+
+    out_vertices[0] = ScreenRectVertex(x, y, crop.left, crop.top);
+    out_vertices[1] = ScreenRectVertex(x + w, y, crop.right, crop.top);
+    out_vertices[2] = ScreenRectVertex(x, y + h, crop.left, crop.bottom);
+    out_vertices[3] = ScreenRectVertex(x + w, y + h, crop.right, crop.bottom);
+
+    return texture;
+}
+
+FramebufferTextureInfo Layer::PrepareRenderTarget(const Tegra::FramebufferConfig& framebuffer) {
+    // If framebuffer is provided, reload it from memory to a texture
+    if (framebuffer_texture.width != static_cast<GLsizei>(framebuffer.width) ||
+        framebuffer_texture.height != static_cast<GLsizei>(framebuffer.height) ||
+        framebuffer_texture.pixel_format != framebuffer.pixel_format ||
+        gl_framebuffer_data.empty()) {
+        // Reallocate texture if the framebuffer size has changed.
+        // This is expected to not happen very often and hence should not be a
+        // performance problem.
+        ConfigureFramebufferTexture(framebuffer);
+    }
+
+    // Load the framebuffer from memory if needed
+    return LoadFBToScreenInfo(framebuffer);
+}
+
+FramebufferTextureInfo Layer::LoadFBToScreenInfo(const Tegra::FramebufferConfig& framebuffer) {
+    const VAddr framebuffer_addr{framebuffer.address + framebuffer.offset};
+    const auto accelerated_info =
+        rasterizer.AccelerateDisplay(framebuffer, framebuffer_addr, framebuffer.stride);
+    if (accelerated_info) {
+        return *accelerated_info;
+    }
+
+    // Reset the screen info's display texture to its own permanent texture
+    FramebufferTextureInfo info{};
+    info.display_texture = framebuffer_texture.resource.handle;
+    info.width = framebuffer.width;
+    info.height = framebuffer.height;
+    info.scaled_width = framebuffer.width;
+    info.scaled_height = framebuffer.height;
+
+    // TODO(Rodrigo): Read this from HLE
+    constexpr u32 block_height_log2 = 4;
+    const auto pixel_format{
+        VideoCore::Surface::PixelFormatFromGPUPixelFormat(framebuffer.pixel_format)};
+    const u32 bytes_per_pixel{VideoCore::Surface::BytesPerBlock(pixel_format)};
+    const u64 size_in_bytes{Tegra::Texture::CalculateSize(
+        true, bytes_per_pixel, framebuffer.stride, framebuffer.height, 1, block_height_log2, 0)};
+    const u8* const host_ptr{device_memory.GetPointer<u8>(framebuffer_addr)};
+    const std::span<const u8> input_data(host_ptr, size_in_bytes);
+    Tegra::Texture::UnswizzleTexture(gl_framebuffer_data, input_data, bytes_per_pixel,
+                                     framebuffer.width, framebuffer.height, 1, block_height_log2,
+                                     0);
+
+    glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, static_cast<GLint>(framebuffer.stride));
+
+    // Update existing texture
+    // TODO: Test what happens on hardware when you change the framebuffer dimensions so that
+    //       they differ from the LCD resolution.
+    // TODO: Applications could theoretically crash yuzu here by specifying too large
+    //       framebuffer sizes. We should make sure that this cannot happen.
+    glTextureSubImage2D(framebuffer_texture.resource.handle, 0, 0, 0, framebuffer.width,
+                        framebuffer.height, framebuffer_texture.gl_format,
+                        framebuffer_texture.gl_type, gl_framebuffer_data.data());
+
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+
+    return info;
+}
+
+void Layer::ConfigureFramebufferTexture(const Tegra::FramebufferConfig& framebuffer) {
+    framebuffer_texture.width = framebuffer.width;
+    framebuffer_texture.height = framebuffer.height;
+    framebuffer_texture.pixel_format = framebuffer.pixel_format;
+
+    const auto pixel_format{
+        VideoCore::Surface::PixelFormatFromGPUPixelFormat(framebuffer.pixel_format)};
+    const u32 bytes_per_pixel{VideoCore::Surface::BytesPerBlock(pixel_format)};
+    gl_framebuffer_data.resize(framebuffer_texture.width * framebuffer_texture.height *
+                               bytes_per_pixel);
+
+    GLint internal_format;
+    switch (framebuffer.pixel_format) {
+    case Service::android::PixelFormat::Rgba8888:
+        internal_format = GL_RGBA8;
+        framebuffer_texture.gl_format = GL_RGBA;
+        framebuffer_texture.gl_type = GL_UNSIGNED_INT_8_8_8_8_REV;
+        break;
+    case Service::android::PixelFormat::Rgb565:
+        internal_format = GL_RGB565;
+        framebuffer_texture.gl_format = GL_RGB;
+        framebuffer_texture.gl_type = GL_UNSIGNED_SHORT_5_6_5;
+        break;
+    default:
+        internal_format = GL_RGBA8;
+        framebuffer_texture.gl_format = GL_RGBA;
+        framebuffer_texture.gl_type = GL_UNSIGNED_INT_8_8_8_8_REV;
+        // UNIMPLEMENTED_MSG("Unknown framebuffer pixel format: {}",
+        //                   static_cast<u32>(framebuffer.pixel_format));
+        break;
+    }
+
+    framebuffer_texture.resource.Release();
+    framebuffer_texture.resource.Create(GL_TEXTURE_2D);
+    glTextureStorage2D(framebuffer_texture.resource.handle, 1, internal_format,
+                       framebuffer_texture.width, framebuffer_texture.height);
+
+    fxaa.reset();
+    smaa.reset();
+}
+
+void Layer::CreateFXAA() {
+    smaa.reset();
+    if (!fxaa) {
+        fxaa = std::make_unique<FXAA>(
+            Settings::values.resolution_info.ScaleUp(framebuffer_texture.width),
+            Settings::values.resolution_info.ScaleUp(framebuffer_texture.height));
+    }
+}
+
+void Layer::CreateSMAA() {
+    fxaa.reset();
+    if (!smaa) {
+        smaa = std::make_unique<SMAA>(
+            Settings::values.resolution_info.ScaleUp(framebuffer_texture.width),
+            Settings::values.resolution_info.ScaleUp(framebuffer_texture.height));
+    }
+}
+
+} // namespace OpenGL

src/video_core/renderer_opengl/present/layer.h

@@ -0,0 +1,80 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <memory>
+#include <vector>
+
+#include "video_core/host1x/gpu_device_memory_manager.h"
+#include "video_core/renderer_opengl/gl_resource_manager.h"
+
+namespace Layout {
+struct FramebufferLayout;
+}
+
+namespace Service::android {
+enum class PixelFormat : u32;
+};
+
+namespace Tegra {
+struct FramebufferConfig;
+}
+
+namespace OpenGL {
+
+struct FramebufferTextureInfo;
+class FSR;
+class FXAA;
+class ProgramManager;
+class RasterizerOpenGL;
+class SMAA;
+
+/// Structure used for storing information about the textures for the Switch screen
+struct TextureInfo {
+    OGLTexture resource;
+    GLsizei width;
+    GLsizei height;
+    GLenum gl_format;
+    GLenum gl_type;
+    Service::android::PixelFormat pixel_format;
+};
+
+struct ScreenRectVertex;
+
+class Layer {
+public:
+    explicit Layer(RasterizerOpenGL& rasterizer, Tegra::MaxwellDeviceMemoryManager& device_memory);
+    ~Layer();
+
+    GLuint ConfigureDraw(std::array<GLfloat, 3 * 2>& out_matrix,
+                         std::array<ScreenRectVertex, 4>& out_vertices,
+                         ProgramManager& program_manager,
+                         const Tegra::FramebufferConfig& framebuffer,
+                         const Layout::FramebufferLayout& layout);
+
+private:
+    /// Loads framebuffer from emulated memory into the active OpenGL texture.
+    FramebufferTextureInfo LoadFBToScreenInfo(const Tegra::FramebufferConfig& framebuffer);
+    FramebufferTextureInfo PrepareRenderTarget(const Tegra::FramebufferConfig& framebuffer);
+    void ConfigureFramebufferTexture(const Tegra::FramebufferConfig& framebuffer);
+
+    void CreateFXAA();
+    void CreateSMAA();
+
+private:
+    RasterizerOpenGL& rasterizer;
+    Tegra::MaxwellDeviceMemoryManager& device_memory;
+
+    /// OpenGL framebuffer data
+    std::vector<u8> gl_framebuffer_data;
+
+    /// Display information for Switch screen
+    TextureInfo framebuffer_texture;
+
+    std::unique_ptr<FSR> fsr;
+    std::unique_ptr<FXAA> fxaa;
+    std::unique_ptr<SMAA> smaa;
+};
+
+} // namespace OpenGL

src/video_core/renderer_opengl/present/present_uniforms.h

@@ -0,0 +1,43 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "video_core/renderer_opengl/gl_resource_manager.h"
+
+namespace OpenGL {
+
+constexpr GLint PositionLocation = 0;
+constexpr GLint TexCoordLocation = 1;
+constexpr GLint ModelViewMatrixLocation = 0;
+
+struct ScreenRectVertex {
+    constexpr ScreenRectVertex() = default;
+
+    constexpr ScreenRectVertex(u32 x, u32 y, GLfloat u, GLfloat v)
+        : position{{static_cast<GLfloat>(x), static_cast<GLfloat>(y)}}, tex_coord{{u, v}} {}
+
+    std::array<GLfloat, 2> position{};
+    std::array<GLfloat, 2> tex_coord{};
+};
+
+/**
+ * Defines a 1:1 pixel orthographic projection matrix with (0,0) on the top-left
+ * corner and (width, height) on the lower-bottom.
+ *
+ * The projection part of the matrix is trivial, hence these operations are represented
+ * by a 3x2 matrix.
+ */
+static inline std::array<GLfloat, 3 * 2> MakeOrthographicMatrix(float width, float height) {
+    std::array<GLfloat, 3 * 2> matrix; // Laid out in column-major order
+
+    // clang-format off
+    matrix[0] = 2.f / width; matrix[2] =  0.f;          matrix[4] = -1.f;
+    matrix[1] = 0.f;         matrix[3] = -2.f / height; matrix[5] =  1.f;
+    // Last matrix row is implicitly assumed to be [0, 0, 1].
+    // clang-format on
+
+    return matrix;
+}
+
+} // namespace OpenGL

src/video_core/renderer_opengl/present/window_adapt_pass.cpp

@@ -2,47 +2,17 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "common/settings.h"
+#include "video_core/framebuffer_config.h"
 #include "video_core/host_shaders/opengl_present_vert.h"
 #include "video_core/renderer_opengl/gl_device.h"
 #include "video_core/renderer_opengl/gl_shader_manager.h"
 #include "video_core/renderer_opengl/gl_shader_util.h"
+#include "video_core/renderer_opengl/present/layer.h"
+#include "video_core/renderer_opengl/present/present_uniforms.h"
 #include "video_core/renderer_opengl/present/window_adapt_pass.h"
 
 namespace OpenGL {
 
-namespace {
-constexpr GLint PositionLocation = 0;
-constexpr GLint TexCoordLocation = 1;
-constexpr GLint ModelViewMatrixLocation = 0;
-
-struct ScreenRectVertex {
-    constexpr ScreenRectVertex(u32 x, u32 y, GLfloat u, GLfloat v)
-        : position{{static_cast<GLfloat>(x), static_cast<GLfloat>(y)}}, tex_coord{{u, v}} {}
-
-    std::array<GLfloat, 2> position;
-    std::array<GLfloat, 2> tex_coord;
-};
-
-/**
- * Defines a 1:1 pixel orthographic projection matrix with (0,0) on the top-left
- * corner and (width, height) on the lower-bottom.
- *
- * The projection part of the matrix is trivial, hence these operations are represented
- * by a 3x2 matrix.
- */
-std::array<GLfloat, 3 * 2> MakeOrthographicMatrix(float width, float height) {
-    std::array<GLfloat, 3 * 2> matrix; // Laid out in column-major order
-
-    // clang-format off
-    matrix[0] = 2.f / width; matrix[2] =  0.f;          matrix[4] = -1.f;
-    matrix[1] = 0.f;         matrix[3] = -2.f / height; matrix[5] =  1.f;
-    // Last matrix row is implicitly assumed to be [0, 0, 1].
-    // clang-format on
-
-    return matrix;
-}
-} // namespace
-
 WindowAdaptPass::WindowAdaptPass(const Device& device_, OGLSampler&& sampler_,
                                  std::string_view frag_source)
     : device(device_), sampler(std::move(sampler_)) {
@@ -65,32 +35,30 @@ WindowAdaptPass::WindowAdaptPass(const Device& device_, OGLSampler&& sampler_,
 
 WindowAdaptPass::~WindowAdaptPass() = default;
 
-void WindowAdaptPass::DrawToFramebuffer(ProgramManager& program_manager, GLuint texture,
-                                        const Layout::FramebufferLayout& layout,
-                                        const Common::Rectangle<f32>& crop) {
-    glBindTextureUnit(0, texture);
+void WindowAdaptPass::DrawToFramebuffer(ProgramManager& program_manager, std::list<Layer>& layers,
+                                        std::span<const Tegra::FramebufferConfig> framebuffers,
+                                        const Layout::FramebufferLayout& layout) {
+    GLint old_read_fb;
+    GLint old_draw_fb;
+    glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &old_read_fb);
+    glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &old_draw_fb);
+
+    const size_t layer_count = framebuffers.size();
+    std::vector<GLuint> textures(layer_count);
+    std::vector<std::array<GLfloat, 3 * 2>> matrices(layer_count);
+    std::vector<std::array<ScreenRectVertex, 4>> vertices(layer_count);
+
+    auto layer_it = layers.begin();
+    for (size_t i = 0; i < layer_count; i++) {
+        textures[i] = layer_it->ConfigureDraw(matrices[i], vertices[i], program_manager,
+                                              framebuffers[i], layout);
+        layer_it++;
+    }
 
-    const std::array ortho_matrix =
-        MakeOrthographicMatrix(static_cast<float>(layout.width), static_cast<float>(layout.height));
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, old_read_fb);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, old_draw_fb);
 
     program_manager.BindPresentPrograms(vert.handle, frag.handle);
-    glProgramUniformMatrix3x2fv(vert.handle, ModelViewMatrixLocation, 1, GL_FALSE,
-                                ortho_matrix.data());
-
-    // Map the coordinates to the screen.
-    const auto& screen = layout.screen;
-    const auto x = screen.left;
-    const auto y = screen.top;
-    const auto w = screen.GetWidth();
-    const auto h = screen.GetHeight();
-
-    const std::array vertices = {
-        ScreenRectVertex(x, y, crop.left, crop.top),
-        ScreenRectVertex(x + w, y, crop.right, crop.top),
-        ScreenRectVertex(x, y + h, crop.left, crop.bottom),
-        ScreenRectVertex(x + w, y + h, crop.right, crop.bottom),
-    };
-    glNamedBufferSubData(vertex_buffer.handle, 0, sizeof(vertices), std::data(vertices));
 
     glDisable(GL_FRAMEBUFFER_SRGB);
     glViewportIndexedf(0, 0.0f, 0.0f, static_cast<GLfloat>(layout.width),
@@ -109,7 +77,7 @@ void WindowAdaptPass::DrawToFramebuffer(ProgramManager& program_manager, GLuint
     if (device.HasVertexBufferUnifiedMemory()) {
         glBindVertexBuffer(0, 0, 0, sizeof(ScreenRectVertex));
         glBufferAddressRangeNV(GL_VERTEX_ATTRIB_ARRAY_ADDRESS_NV, 0, vertex_buffer_address,
-                               sizeof(vertices));
+                               sizeof(decltype(vertices)::value_type));
     } else {
         glBindVertexBuffer(0, vertex_buffer.handle, 0, sizeof(ScreenRectVertex));
     }
@@ -122,7 +90,14 @@ void WindowAdaptPass::DrawToFramebuffer(ProgramManager& program_manager, GLuint
                  Settings::values.bg_blue.GetValue() / 255.0f, 1.0f);
 
     glClear(GL_COLOR_BUFFER_BIT);
+
+    for (size_t i = 0; i < layer_count; i++) {
+        glBindTextureUnit(0, textures[i]);
+        glProgramUniformMatrix3x2fv(vert.handle, ModelViewMatrixLocation, 1, GL_FALSE,
+                                    matrices[i].data());
+        glNamedBufferSubData(vertex_buffer.handle, 0, sizeof(vertices[i]), std::data(vertices[i]));
         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
     }
+}
 
 } // namespace OpenGL

src/video_core/renderer_opengl/present/window_adapt_pass.h

@@ -3,6 +3,9 @@
 
 #pragma once
 
+#include <list>
+#include <span>
+
 #include "common/math_util.h"
 #include "video_core/renderer_opengl/gl_resource_manager.h"
 
@@ -10,9 +13,14 @@ namespace Layout {
 struct FramebufferLayout;
 }
 
+namespace Tegra {
+struct FramebufferConfig;
+}
+
 namespace OpenGL {
 
 class Device;
+class Layer;
 class ProgramManager;
 
 class WindowAdaptPass final {
@@ -21,9 +29,9 @@ public:
                              std::string_view frag_source);
     ~WindowAdaptPass();
 
-    void DrawToFramebuffer(ProgramManager& program_manager, GLuint texture,
-                           const Layout::FramebufferLayout& layout,
-                           const Common::Rectangle<f32>& crop);
+    void DrawToFramebuffer(ProgramManager& program_manager, std::list<Layer>& layers,
+                           std::span<const Tegra::FramebufferConfig> framebuffers,
+                           const Layout::FramebufferLayout& layout);
 
 private:
     const Device& device;

src/video_core/renderer_opengl/renderer_opengl.cpp

@@ -130,10 +130,10 @@ void RendererOpenGL::SwapBuffers(const Tegra::FramebufferConfig* framebuffer) {
         return;
     }
 
-    RenderScreenshot(*framebuffer);
+    RenderScreenshot(framebuffer);
 
     state_tracker.BindFramebuffer(0);
-    blit_screen->DrawScreen(*framebuffer, emu_window.GetFramebufferLayout());
+    blit_screen->DrawScreen(std::span(framebuffer, 1), emu_window.GetFramebufferLayout());
 
     ++m_current_frame;
 
@@ -159,7 +159,7 @@ void RendererOpenGL::AddTelemetryFields() {
     telemetry_session.AddField(user_system, "GPU_OpenGL_Version", std::string(gl_version));
 }
 
-void RendererOpenGL::RenderScreenshot(const Tegra::FramebufferConfig& framebuffer) {
+void RendererOpenGL::RenderScreenshot(const Tegra::FramebufferConfig* framebuffer) {
     if (!renderer_settings.screenshot_requested) {
         return;
     }
@@ -181,7 +181,7 @@ void RendererOpenGL::RenderScreenshot(const Tegra::FramebufferConfig& framebuffe
     glRenderbufferStorage(GL_RENDERBUFFER, GL_SRGB8, layout.width, layout.height);
     glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, renderbuffer);
 
-    blit_screen->DrawScreen(framebuffer, layout);
+    blit_screen->DrawScreen(std::span(framebuffer, 1), layout);
 
     glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
     glPixelStorei(GL_PACK_ROW_LENGTH, 0);

src/video_core/renderer_opengl/renderer_opengl.h

@@ -52,7 +52,7 @@ public:
 
 private:
     void AddTelemetryFields();
-    void RenderScreenshot(const Tegra::FramebufferConfig& framebuffer);
+    void RenderScreenshot(const Tegra::FramebufferConfig* framebuffer);
 
     Core::TelemetrySession& telemetry_session;
     Core::Frontend::EmuWindow& emu_window;