// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <cstddef>
#include <cstdlib>
#include <memory>
#include <glad/glad.h>
#include "common/assert.h"
#include "common/logging/log.h"
#include "common/microprofile.h"
#include "common/telemetry.h"
#include "core/core.h"
#include "core/core_timing.h"
#include "core/frontend/emu_window.h"
#include "core/memory.h"
#include "core/perf_stats.h"
#include "core/settings.h"
#include "core/telemetry_session.h"
#include "video_core/morton.h"
#include "video_core/renderer_opengl/gl_rasterizer.h"
#include "video_core/renderer_opengl/renderer_opengl.h"
namespace OpenGL {
// If the size of this is too small, it ends up creating a soft cap on FPS as the renderer will have
// to wait on available presentation frames.
constexpr std::size_t SWAP_CHAIN_SIZE = 3;
struct Frame {
u32 width{}; /// Width of the frame (to detect resize)
u32 height{}; /// Height of the frame
bool color_reloaded{}; /// Texture attachment was recreated (ie: resized)
OpenGL::OGLRenderbuffer color{}; /// Buffer shared between the render/present FBO
OpenGL::OGLFramebuffer render{}; /// FBO created on the render thread
OpenGL::OGLFramebuffer present{}; /// FBO created on the present thread
GLsync render_fence{}; /// Fence created on the render thread
GLsync present_fence{}; /// Fence created on the presentation thread
bool is_srgb{}; /// Framebuffer is sRGB or RGB
};
/**
* For smooth Vsync rendering, we want to always present the latest frame that the core generates,
* but also make sure that rendering happens at the pace that the frontend dictates. This is a
* helper class that the renderer uses to sync frames between the render thread and the presentation
* thread
*/
class FrameMailbox {
public:
std::mutex swap_chain_lock;
std::condition_variable present_cv;
std::array<Frame, SWAP_CHAIN_SIZE> swap_chain{};
std::queue<Frame*> free_queue;
std::deque<Frame*> present_queue;
Frame* previous_frame{};
FrameMailbox() {
for (auto& frame : swap_chain) {
free_queue.push(&frame);
}
}
~FrameMailbox() {
// lock the mutex and clear out the present and free_queues and notify any people who are
// blocked to prevent deadlock on shutdown
std::scoped_lock lock{swap_chain_lock};
std::queue<Frame*>().swap(free_queue);
present_queue.clear();
present_cv.notify_all();
}
void ReloadPresentFrame(Frame* frame, u32 height, u32 width) {
frame->present.Release();
frame->present.Create();
GLint previous_draw_fbo{};
glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &previous_draw_fbo);
glBindFramebuffer(GL_FRAMEBUFFER, frame->present.handle);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER,
frame->color.handle);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
LOG_CRITICAL(Render_OpenGL, "Failed to recreate present FBO!");
}
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, previous_draw_fbo);
frame->color_reloaded = false;
}
void ReloadRenderFrame(Frame* frame, u32 width, u32 height) {
OpenGLState prev_state = OpenGLState::GetCurState();
OpenGLState state = OpenGLState::GetCurState();
// Recreate the color texture attachment
frame->color.Release();
frame->color.Create();
state.renderbuffer = frame->color.handle;
state.Apply();
glRenderbufferStorage(GL_RENDERBUFFER, frame->is_srgb ? GL_SRGB8 : GL_RGB8, width, height);
// Recreate the FBO for the render target
frame->render.Release();
frame->render.Create();
state.draw.read_framebuffer = frame->render.handle;
state.draw.draw_framebuffer = frame->render.handle;
state.Apply();
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER,
frame->color.handle);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
LOG_CRITICAL(Render_OpenGL, "Failed to recreate render FBO!");
}
prev_state.Apply();
frame->width = width;
frame->height = height;
frame->color_reloaded = true;
}
Frame* GetRenderFrame() {
std::unique_lock lock{swap_chain_lock};
// If theres no free frames, we will reuse the oldest render frame
if (free_queue.empty()) {
auto frame = present_queue.back();
present_queue.pop_back();
return frame;
}
Frame* frame = free_queue.front();
free_queue.pop();
return frame;
}
void ReleaseRenderFrame(Frame* frame) {
std::unique_lock lock{swap_chain_lock};
present_queue.push_front(frame);
present_cv.notify_one();
}
Frame* TryGetPresentFrame(int timeout_ms) {
std::unique_lock lock{swap_chain_lock};
// wait for new entries in the present_queue
present_cv.wait_for(lock, std::chrono::milliseconds(timeout_ms),
[&] { return !present_queue.empty(); });
if (present_queue.empty()) {
// timed out waiting for a frame to draw so return the previous frame
return previous_frame;
}
// free the previous frame and add it back to the free queue
if (previous_frame) {
free_queue.push(previous_frame);
}
// the newest entries are pushed to the front of the queue
Frame* frame = present_queue.front();
present_queue.pop_front();
// remove all old entries from the present queue and move them back to the free_queue
for (auto f : present_queue) {
free_queue.push(f);
}
present_queue.clear();
previous_frame = frame;
return frame;
}
};
namespace {
constexpr char vertex_shader[] = R"(
#version 430 core
layout (location = 0) in vec2 vert_position;
layout (location = 1) in vec2 vert_tex_coord;
layout (location = 0) out vec2 frag_tex_coord;
// This is a truncated 3x3 matrix for 2D transformations:
// The upper-left 2x2 submatrix performs scaling/rotation/mirroring.
// The third column performs translation.
// The third row could be used for projection, which we don't need in 2D. It hence is assumed to
// implicitly be [0, 0, 1]
layout (location = 0) uniform mat3x2 modelview_matrix;
void main() {
// Multiply input position by the rotscale part of the matrix and then manually translate by
// the last column. This is equivalent to using a full 3x3 matrix and expanding the vector
// to `vec3(vert_position.xy, 1.0)`
gl_Position = vec4(mat2(modelview_matrix) * vert_position + modelview_matrix[2], 0.0, 1.0);
frag_tex_coord = vert_tex_coord;
}
)";
constexpr char fragment_shader[] = R"(
#version 430 core
layout (location = 0) in vec2 frag_tex_coord;
layout (location = 0) out vec4 color;
layout (binding = 0) uniform sampler2D color_texture;
void main() {
color = texture(color_texture, frag_tex_coord);
}
)";
constexpr GLint PositionLocation = 0;
constexpr GLint TexCoordLocation = 1;
constexpr GLint ModelViewMatrixLocation = 0;
struct ScreenRectVertex {
constexpr ScreenRectVertex(GLfloat x, GLfloat y, GLfloat u, GLfloat v)
: position{{x, y}}, tex_coord{{u, v}} {}
std::array<GLfloat, 2> position;
std::array<GLfloat, 2> tex_coord;
};
/**
* Defines a 1:1 pixel ortographic 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;
}
const char* GetSource(GLenum source) {
switch (source) {
case GL_DEBUG_SOURCE_API:
return "API";
case GL_DEBUG_SOURCE_WINDOW_SYSTEM:
return "WINDOW_SYSTEM";
case GL_DEBUG_SOURCE_SHADER_COMPILER:
return "SHADER_COMPILER";
case GL_DEBUG_SOURCE_THIRD_PARTY:
return "THIRD_PARTY";
case GL_DEBUG_SOURCE_APPLICATION:
return "APPLICATION";
case GL_DEBUG_SOURCE_OTHER:
return "OTHER";
default:
UNREACHABLE();
return "Unknown source";
}
}
const char* GetType(GLenum type) {
switch (type) {
case GL_DEBUG_TYPE_ERROR:
return "ERROR";
case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR:
return "DEPRECATED_BEHAVIOR";
case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR:
return "UNDEFINED_BEHAVIOR";
case GL_DEBUG_TYPE_PORTABILITY:
return "PORTABILITY";
case GL_DEBUG_TYPE_PERFORMANCE:
return "PERFORMANCE";
case GL_DEBUG_TYPE_OTHER:
return "OTHER";
case GL_DEBUG_TYPE_MARKER:
return "MARKER";
default:
UNREACHABLE();
return "Unknown type";
}
}
void APIENTRY DebugHandler(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length,
const GLchar* message, const void* user_param) {
const char format[] = "{} {} {}: {}";
const char* const str_source = GetSource(source);
const char* const str_type = GetType(type);
switch (severity) {
case GL_DEBUG_SEVERITY_HIGH:
LOG_CRITICAL(Render_OpenGL, format, str_source, str_type, id, message);
break;
case GL_DEBUG_SEVERITY_MEDIUM:
LOG_WARNING(Render_OpenGL, format, str_source, str_type, id, message);
break;
case GL_DEBUG_SEVERITY_NOTIFICATION:
case GL_DEBUG_SEVERITY_LOW:
LOG_DEBUG(Render_OpenGL, format, str_source, str_type, id, message);
break;
}
}
} // Anonymous namespace
RendererOpenGL::RendererOpenGL(Core::Frontend::EmuWindow& emu_window, Core::System& system)
: VideoCore::RendererBase{emu_window}, emu_window{emu_window}, system{system},
frame_mailbox{std::make_unique<FrameMailbox>()} {}
RendererOpenGL::~RendererOpenGL() = default;
MICROPROFILE_DEFINE(OpenGL_RenderFrame, "OpenGL", "Render Frame", MP_RGB(128, 128, 64));
MICROPROFILE_DEFINE(OpenGL_WaitPresent, "OpenGL", "Wait For Present", MP_RGB(128, 128, 128));
void RendererOpenGL::SwapBuffers(const Tegra::FramebufferConfig* framebuffer) {
render_window.PollEvents();
if (!framebuffer) {
return;
}
PrepareRendertarget(framebuffer);
RenderScreenshot();
Frame* frame;
{
MICROPROFILE_SCOPE(OpenGL_WaitPresent);
frame = frame_mailbox->GetRenderFrame();
// Clean up sync objects before drawing
// INTEL driver workaround. We can't delete the previous render sync object until we are
// sure that the presentation is done
if (frame->present_fence) {
glClientWaitSync(frame->present_fence, 0, GL_TIMEOUT_IGNORED);
}
// delete the draw fence if the frame wasn't presented
if (frame->render_fence) {
glDeleteSync(frame->render_fence);
frame->render_fence = 0;
}
// wait for the presentation to be done
if (frame->present_fence) {
glWaitSync(frame->present_fence, 0, GL_TIMEOUT_IGNORED);
glDeleteSync(frame->present_fence);
frame->present_fence = 0;
}
}
{
MICROPROFILE_SCOPE(OpenGL_RenderFrame);
const auto& layout = render_window.GetFramebufferLayout();
// Recreate the frame if the size of the window has changed
if (layout.width != frame->width || layout.height != frame->height ||
screen_info.display_srgb != frame->is_srgb) {
LOG_DEBUG(Render_OpenGL, "Reloading render frame");
frame->is_srgb = screen_info.display_srgb;
frame_mailbox->ReloadRenderFrame(frame, layout.width, layout.height);
}
state.draw.draw_framebuffer = frame->render.handle;
state.Apply();
DrawScreen(layout);
// Create a fence for the frontend to wait on and swap this frame to OffTex
frame->render_fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
glFlush();
frame_mailbox->ReleaseRenderFrame(frame);
m_current_frame++;
rasterizer->TickFrame();
}
}
void RendererOpenGL::PrepareRendertarget(const Tegra::FramebufferConfig* framebuffer) {
if (framebuffer) {
// If framebuffer is provided, reload it from memory to a texture
if (screen_info.texture.width != static_cast<GLsizei>(framebuffer->width) ||
screen_info.texture.height != static_cast<GLsizei>(framebuffer->height) ||
screen_info.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(screen_info.texture, *framebuffer);
}
// Load the framebuffer from memory, draw it to the screen, and swap buffers
LoadFBToScreenInfo(*framebuffer);
}
}
void RendererOpenGL::LoadFBToScreenInfo(const Tegra::FramebufferConfig& framebuffer) {
// Framebuffer orientation handling
framebuffer_transform_flags = framebuffer.transform_flags;
framebuffer_crop_rect = framebuffer.crop_rect;
const VAddr framebuffer_addr{framebuffer.address + framebuffer.offset};
if (rasterizer->AccelerateDisplay(framebuffer, framebuffer_addr, framebuffer.stride)) {
return;
}
// Reset the screen info's display texture to its own permanent texture
screen_info.display_texture = screen_info.texture.resource.handle;
const auto pixel_format{
VideoCore::Surface::PixelFormatFromGPUPixelFormat(framebuffer.pixel_format)};
const u32 bytes_per_pixel{VideoCore::Surface::GetBytesPerPixel(pixel_format)};
const u64 size_in_bytes{framebuffer.stride * framebuffer.height * bytes_per_pixel};
u8* const host_ptr{system.Memory().GetPointer(framebuffer_addr)};
rasterizer->FlushRegion(ToCacheAddr(host_ptr), size_in_bytes);
// TODO(Rodrigo): Read this from HLE
constexpr u32 block_height_log2 = 4;
VideoCore::MortonSwizzle(VideoCore::MortonSwizzleMode::MortonToLinear, pixel_format,
framebuffer.stride, block_height_log2, framebuffer.height, 0, 1, 1,
gl_framebuffer_data.data(), host_ptr);
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(screen_info.texture.resource.handle, 0, 0, 0, framebuffer.width,
framebuffer.height, screen_info.texture.gl_format,
screen_info.texture.gl_type, gl_framebuffer_data.data());
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
}
void RendererOpenGL::LoadColorToActiveGLTexture(u8 color_r, u8 color_g, u8 color_b, u8 color_a,
const TextureInfo& texture) {
const u8 framebuffer_data[4] = {color_a, color_b, color_g, color_r};
glClearTexImage(texture.resource.handle, 0, GL_RGBA, GL_UNSIGNED_BYTE, framebuffer_data);
}
void RendererOpenGL::InitOpenGLObjects() {
glClearColor(Settings::values.bg_red, Settings::values.bg_green, Settings::values.bg_blue,
0.0f);
// Link shaders and get variable locations
shader.CreateFromSource(vertex_shader, nullptr, fragment_shader);
state.draw.shader_program = shader.handle;
state.Apply();
// Generate VBO handle for drawing
vertex_buffer.Create();
// Generate VAO
vertex_array.Create();
state.draw.vertex_array = vertex_array.handle;
// Attach vertex data to VAO
glNamedBufferData(vertex_buffer.handle, sizeof(ScreenRectVertex) * 4, nullptr, GL_STREAM_DRAW);
glVertexArrayAttribFormat(vertex_array.handle, PositionLocation, 2, GL_FLOAT, GL_FALSE,
offsetof(ScreenRectVertex, position));
glVertexArrayAttribFormat(vertex_array.handle, TexCoordLocation, 2, GL_FLOAT, GL_FALSE,
offsetof(ScreenRectVertex, tex_coord));
glVertexArrayAttribBinding(vertex_array.handle, PositionLocation, 0);
glVertexArrayAttribBinding(vertex_array.handle, TexCoordLocation, 0);
glEnableVertexArrayAttrib(vertex_array.handle, PositionLocation);
glEnableVertexArrayAttrib(vertex_array.handle, TexCoordLocation);
glVertexArrayVertexBuffer(vertex_array.handle, 0, vertex_buffer.handle, 0,
sizeof(ScreenRectVertex));
// Allocate textures for the screen
screen_info.texture.resource.Create(GL_TEXTURE_2D);
const GLuint texture = screen_info.texture.resource.handle;
glTextureStorage2D(texture, 1, GL_RGBA8, 1, 1);
screen_info.display_texture = screen_info.texture.resource.handle;
// Clear screen to black
LoadColorToActiveGLTexture(0, 0, 0, 0, screen_info.texture);
}
void RendererOpenGL::AddTelemetryFields() {
const char* const gl_version{reinterpret_cast<char const*>(glGetString(GL_VERSION))};
const char* const gpu_vendor{reinterpret_cast<char const*>(glGetString(GL_VENDOR))};
const char* const gpu_model{reinterpret_cast<char const*>(glGetString(GL_RENDERER))};
LOG_INFO(Render_OpenGL, "GL_VERSION: {}", gl_version);
LOG_INFO(Render_OpenGL, "GL_VENDOR: {}", gpu_vendor);
LOG_INFO(Render_OpenGL, "GL_RENDERER: {}", gpu_model);
auto& telemetry_session = system.TelemetrySession();
telemetry_session.AddField(Telemetry::FieldType::UserSystem, "GPU_Vendor", gpu_vendor);
telemetry_session.AddField(Telemetry::FieldType::UserSystem, "GPU_Model", gpu_model);
telemetry_session.AddField(Telemetry::FieldType::UserSystem, "GPU_OpenGL_Version", gl_version);
}
void RendererOpenGL::CreateRasterizer() {
if (rasterizer) {
return;
}
rasterizer = std::make_unique<RasterizerOpenGL>(system, emu_window, screen_info);
}
void RendererOpenGL::ConfigureFramebufferTexture(TextureInfo& texture,
const Tegra::FramebufferConfig& framebuffer) {
texture.width = framebuffer.width;
texture.height = framebuffer.height;
texture.pixel_format = framebuffer.pixel_format;
const auto pixel_format{
VideoCore::Surface::PixelFormatFromGPUPixelFormat(framebuffer.pixel_format)};
const u32 bytes_per_pixel{VideoCore::Surface::GetBytesPerPixel(pixel_format)};
gl_framebuffer_data.resize(texture.width * texture.height * bytes_per_pixel);
GLint internal_format;
switch (framebuffer.pixel_format) {
case Tegra::FramebufferConfig::PixelFormat::ABGR8:
internal_format = GL_RGBA8;
texture.gl_format = GL_RGBA;
texture.gl_type = GL_UNSIGNED_INT_8_8_8_8_REV;
break;
case Tegra::FramebufferConfig::PixelFormat::RGB565:
internal_format = GL_RGB565;
texture.gl_format = GL_RGB;
texture.gl_type = GL_UNSIGNED_SHORT_5_6_5;
break;
default:
internal_format = GL_RGBA8;
texture.gl_format = GL_RGBA;
texture.gl_type = GL_UNSIGNED_INT_8_8_8_8_REV;
UNIMPLEMENTED_MSG("Unknown framebuffer pixel format: {}",
static_cast<u32>(framebuffer.pixel_format));
}
texture.resource.Release();
texture.resource.Create(GL_TEXTURE_2D);
glTextureStorage2D(texture.resource.handle, 1, internal_format, texture.width, texture.height);
}
void RendererOpenGL::DrawScreenTriangles(const ScreenInfo& screen_info, float x, float y, float w,
float h) {
const auto& texcoords = screen_info.display_texcoords;
auto left = texcoords.left;
auto right = texcoords.right;
if (framebuffer_transform_flags != Tegra::FramebufferConfig::TransformFlags::Unset) {
if (framebuffer_transform_flags == Tegra::FramebufferConfig::TransformFlags::FlipV) {
// Flip the framebuffer vertically
left = texcoords.right;
right = texcoords.left;
} else {
// Other transformations are unsupported
LOG_CRITICAL(Render_OpenGL, "Unsupported framebuffer_transform_flags={}",
static_cast<u32>(framebuffer_transform_flags));
UNIMPLEMENTED();
}
}
ASSERT_MSG(framebuffer_crop_rect.top == 0, "Unimplemented");
ASSERT_MSG(framebuffer_crop_rect.left == 0, "Unimplemented");
// Scale the output by the crop width/height. This is commonly used with 1280x720 rendering
// (e.g. handheld mode) on a 1920x1080 framebuffer.
f32 scale_u = 1.f, scale_v = 1.f;
if (framebuffer_crop_rect.GetWidth() > 0) {
scale_u = static_cast<f32>(framebuffer_crop_rect.GetWidth()) /
static_cast<f32>(screen_info.texture.width);
}
if (framebuffer_crop_rect.GetHeight() > 0) {
scale_v = static_cast<f32>(framebuffer_crop_rect.GetHeight()) /
static_cast<f32>(screen_info.texture.height);
}
const std::array vertices = {
ScreenRectVertex(x, y, texcoords.top * scale_u, left * scale_v),
ScreenRectVertex(x + w, y, texcoords.bottom * scale_u, left * scale_v),
ScreenRectVertex(x, y + h, texcoords.top * scale_u, right * scale_v),
ScreenRectVertex(x + w, y + h, texcoords.bottom * scale_u, right * scale_v),
};
state.textures[0] = screen_info.display_texture;
state.framebuffer_srgb.enabled = screen_info.display_srgb;
state.Apply();
glNamedBufferSubData(vertex_buffer.handle, 0, sizeof(vertices), std::data(vertices));
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
// Restore default state
state.framebuffer_srgb.enabled = false;
state.textures[0] = 0;
state.Apply();
}
void RendererOpenGL::DrawScreen(const Layout::FramebufferLayout& layout) {
if (renderer_settings.set_background_color) {
// Update background color before drawing
glClearColor(Settings::values.bg_red, Settings::values.bg_green, Settings::values.bg_blue,
0.0f);
}
const auto& screen = layout.screen;
glViewport(0, 0, layout.width, layout.height);
glClear(GL_COLOR_BUFFER_BIT);
// Set projection matrix
const std::array ortho_matrix =
MakeOrthographicMatrix(static_cast<float>(layout.width), static_cast<float>(layout.height));
glUniformMatrix3x2fv(ModelViewMatrixLocation, 1, GL_FALSE, ortho_matrix.data());
DrawScreenTriangles(screen_info, static_cast<float>(screen.left),
static_cast<float>(screen.top), static_cast<float>(screen.GetWidth()),
static_cast<float>(screen.GetHeight()));
}
void RendererOpenGL::TryPresent(int timeout_ms) {
const auto& layout = render_window.GetFramebufferLayout();
auto frame = frame_mailbox->TryGetPresentFrame(timeout_ms);
if (!frame) {
LOG_DEBUG(Render_OpenGL, "TryGetPresentFrame returned no frame to present");
return;
}
// Clearing before a full overwrite of a fbo can signal to drivers that they can avoid a
// readback since we won't be doing any blending
glClear(GL_COLOR_BUFFER_BIT);
// Recreate the presentation FBO if the color attachment was changed
if (frame->color_reloaded) {
LOG_DEBUG(Render_OpenGL, "Reloading present frame");
frame_mailbox->ReloadPresentFrame(frame, layout.width, layout.height);
}
glWaitSync(frame->render_fence, 0, GL_TIMEOUT_IGNORED);
// INTEL workaround.
// Normally we could just delete the draw fence here, but due to driver bugs, we can just delete
// it on the emulation thread without too much penalty
// glDeleteSync(frame.render_sync);
// frame.render_sync = 0;
glBindFramebuffer(GL_READ_FRAMEBUFFER, frame->present.handle);
glBlitFramebuffer(0, 0, frame->width, frame->height, 0, 0, layout.width, layout.height,
GL_COLOR_BUFFER_BIT, GL_LINEAR);
// Insert fence for the main thread to block on
frame->present_fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
glFlush();
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
}
void RendererOpenGL::RenderScreenshot() {
if (!renderer_settings.screenshot_requested) {
return;
}
// Draw the current frame to the screenshot framebuffer
screenshot_framebuffer.Create();
GLuint old_read_fb = state.draw.read_framebuffer;
GLuint old_draw_fb = state.draw.draw_framebuffer;
state.draw.read_framebuffer = state.draw.draw_framebuffer = screenshot_framebuffer.handle;
state.Apply();
Layout::FramebufferLayout layout{renderer_settings.screenshot_framebuffer_layout};
GLuint renderbuffer;
glGenRenderbuffers(1, &renderbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
glRenderbufferStorage(GL_RENDERBUFFER, screen_info.display_srgb ? GL_SRGB8 : GL_RGB8,
layout.width, layout.height);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, renderbuffer);
DrawScreen(layout);
glReadPixels(0, 0, layout.width, layout.height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV,
renderer_settings.screenshot_bits);
screenshot_framebuffer.Release();
state.draw.read_framebuffer = old_read_fb;
state.draw.draw_framebuffer = old_draw_fb;
state.Apply();
glDeleteRenderbuffers(1, &renderbuffer);
renderer_settings.screenshot_complete_callback();
renderer_settings.screenshot_requested = false;
}
bool RendererOpenGL::Init() {
if (GLAD_GL_KHR_debug) {
glEnable(GL_DEBUG_OUTPUT);
glDebugMessageCallback(DebugHandler, nullptr);
}
AddTelemetryFields();
if (!GLAD_GL_VERSION_4_3) {
return false;
}
InitOpenGLObjects();
CreateRasterizer();
return true;
}
void RendererOpenGL::ShutDown() {}
} // namespace OpenGL