1 files changed, 215 insertions, 0 deletions
diff --git a/src/video_core/renderer_opengl/present/layer.cpp b/src/video_core/renderer_opengl/present/layer.cpp
new file mode 100644
index 000000000..8643e07c6
--- /dev/null
+++ b/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