1 files changed, 103 insertions, 0 deletions
diff --git a/src/video_core/renderer_opengl/present/window_adapt_pass.cpp b/src/video_core/renderer_opengl/present/window_adapt_pass.cpp
new file mode 100644
index 000000000..4d681606b
--- /dev/null
+++ b/src/video_core/renderer_opengl/present/window_adapt_pass.cpp
@@ -0,0 +1,103 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// 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 {
+
+WindowAdaptPass::WindowAdaptPass(const Device& device_, OGLSampler&& sampler_,
+                                 std::string_view frag_source)
+    : device(device_), sampler(std::move(sampler_)) {
+    vert = CreateProgram(HostShaders::OPENGL_PRESENT_VERT, GL_VERTEX_SHADER);
+    frag = CreateProgram(frag_source, GL_FRAGMENT_SHADER);
+
+    // Generate VBO handle for drawing
+    vertex_buffer.Create();
+
+    // Attach vertex data to VAO
+    glNamedBufferData(vertex_buffer.handle, sizeof(ScreenRectVertex) * 4, nullptr, GL_STREAM_DRAW);
+
+    // Query vertex buffer address when the driver supports unified vertex attributes
+    if (device.HasVertexBufferUnifiedMemory()) {
+        glMakeNamedBufferResidentNV(vertex_buffer.handle, GL_READ_ONLY);
+        glGetNamedBufferParameterui64vNV(vertex_buffer.handle, GL_BUFFER_GPU_ADDRESS_NV,
+                                         &vertex_buffer_address);
+    }
+}
+
+WindowAdaptPass::~WindowAdaptPass() = default;
+
+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++;
+    }
+
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, old_read_fb);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, old_draw_fb);
+
+    program_manager.BindPresentPrograms(vert.handle, frag.handle);
+
+    glDisable(GL_FRAMEBUFFER_SRGB);
+    glViewportIndexedf(0, 0.0f, 0.0f, static_cast<GLfloat>(layout.width),
+                       static_cast<GLfloat>(layout.height));
+
+    glEnableVertexAttribArray(PositionLocation);
+    glEnableVertexAttribArray(TexCoordLocation);
+    glVertexAttribDivisor(PositionLocation, 0);
+    glVertexAttribDivisor(TexCoordLocation, 0);
+    glVertexAttribFormat(PositionLocation, 2, GL_FLOAT, GL_FALSE,
+                         offsetof(ScreenRectVertex, position));
+    glVertexAttribFormat(TexCoordLocation, 2, GL_FLOAT, GL_FALSE,
+                         offsetof(ScreenRectVertex, tex_coord));
+    glVertexAttribBinding(PositionLocation, 0);
+    glVertexAttribBinding(TexCoordLocation, 0);
+    if (device.HasVertexBufferUnifiedMemory()) {
+        glBindVertexBuffer(0, 0, 0, sizeof(ScreenRectVertex));
+        glBufferAddressRangeNV(GL_VERTEX_ATTRIB_ARRAY_ADDRESS_NV, 0, vertex_buffer_address,
+                               sizeof(decltype(vertices)::value_type));
+    } else {
+        glBindVertexBuffer(0, vertex_buffer.handle, 0, sizeof(ScreenRectVertex));
+    }
+
+    glBindSampler(0, sampler.handle);
+
+    // Update background color before drawing
+    glClearColor(Settings::values.bg_red.GetValue() / 255.0f,
+                 Settings::values.bg_green.GetValue() / 255.0f,
+                 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