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moonlight-qt/app/streaming/video/ffmpeg-renderers/eglvid.cpp

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// vim: noai:ts=4:sw=4:softtabstop=4:expandtab
#include "eglvid.h"
#include "path.h"
#include "streaming/session.h"
#include "streaming/streamutils.h"
#include <QDir>
#include <Limelight.h>
#include <unistd.h>
#include <SDL_egl.h>
#include <SDL_opengles2.h>
#include <SDL_render.h>
#include <SDL_syswm.h>
#ifndef EGL_VERSION_1_5
typedef intptr_t EGLAttrib;
#endif
#if !defined(EGL_VERSION_1_5) || !defined(EGL_EGL_PROTOTYPES)
typedef EGLDisplay (EGLAPIENTRYP PFNEGLGETPLATFORMDISPLAYPROC) (EGLenum platform, void *native_display, const EGLAttrib *attrib_list);
#endif
#ifndef EGL_EXT_platform_base
typedef EGLDisplay (EGLAPIENTRYP PFNEGLGETPLATFORMDISPLAYEXTPROC) (EGLenum platform, void *native_display, const EGLint *attrib_list);
#endif
// These are EGL extensions, so some platform headers may not provide them
#ifndef EGL_PLATFORM_WAYLAND_KHR
#define EGL_PLATFORM_WAYLAND_KHR 0x31D8
#endif
#ifndef EGL_PLATFORM_X11_KHR
#define EGL_PLATFORM_X11_KHR 0x31D5
#endif
/* TODO:
* - handle more pixel formats
* - handle software decoding
*/
/* DOC/misc:
* - https://kernel-recipes.org/en/2016/talks/video-and-colorspaces/
* - http://www.brucelindbloom.com/
* - https://learnopengl.com/Getting-started/Shaders
* - https://github.com/stunpix/yuvit
* - https://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.601_conversion
* - https://www.renesas.com/eu/en/www/doc/application-note/an9717.pdf
* - https://www.xilinx.com/support/documentation/application_notes/xapp283.pdf
* - https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.709-6-201506-I!!PDF-E.pdf
* - https://www.khronos.org/registry/OpenGL/extensions/OES/OES_EGL_image_external.txt
* - https://gist.github.com/rexguo/6696123
* - https://wiki.libsdl.org/CategoryVideo
*/
#define EGL_LOG(Category, ...) SDL_Log ## Category(\
SDL_LOG_CATEGORY_APPLICATION, \
"EGLRenderer: " __VA_ARGS__)
EGLRenderer::EGLRenderer(IFFmpegRenderer *backendRenderer)
:
m_SwPixelFormat(AV_PIX_FMT_NONE),
m_EGLDisplay(EGL_NO_DISPLAY),
m_Textures{0},
m_ShaderProgram(0),
m_Context(0),
m_Window(nullptr),
m_Backend(backendRenderer),
m_VAO(0),
m_ColorSpace(AVCOL_SPC_NB),
m_ColorFull(false),
m_BlockingSwapBuffers(false),
m_glEGLImageTargetTexture2DOES(nullptr),
m_glGenVertexArraysOES(nullptr),
m_glBindVertexArrayOES(nullptr),
m_glDeleteVertexArraysOES(nullptr),
m_DummyRenderer(nullptr)
{
SDL_assert(backendRenderer);
SDL_assert(backendRenderer->canExportEGL());
// Save these global parameters so we can restore them in our destructor
SDL_GL_GetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, &m_OldContextProfileMask);
SDL_GL_GetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, &m_OldContextMajorVersion);
SDL_GL_GetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, &m_OldContextMinorVersion);
}
EGLRenderer::~EGLRenderer()
{
if (m_Context) {
// Reattach the GL context to the main thread for destruction
SDL_GL_MakeCurrent(m_Window, m_Context);
if (m_ShaderProgram) {
glDeleteProgram(m_ShaderProgram);
}
if (m_VAO) {
SDL_assert(m_glDeleteVertexArraysOES != nullptr);
m_glDeleteVertexArraysOES(1, &m_VAO);
}
if (m_DummyRenderer) {
SDL_DestroyRenderer(m_DummyRenderer);
}
SDL_GL_DeleteContext(m_Context);
}
// Reset the global properties back to what they were before
SDL_SetHint(SDL_HINT_OPENGL_ES_DRIVER, "0");
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, m_OldContextProfileMask);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, m_OldContextMajorVersion);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, m_OldContextMinorVersion);
}
bool EGLRenderer::prepareDecoderContext(AVCodecContext*, AVDictionary**)
{
/* Nothing to do */
EGL_LOG(Info, "Using EGL renderer");
return true;
}
void EGLRenderer::notifyOverlayUpdated(Overlay::OverlayType)
{
// TODO: FIXME
}
bool EGLRenderer::isPixelFormatSupported(int, AVPixelFormat pixelFormat)
{
// Remember to keep this in sync with EGLRenderer::renderFrame()!
switch (pixelFormat)
{
case AV_PIX_FMT_NV12:
return true;
default:
return false;
}
}
int EGLRenderer::loadAndBuildShader(int shaderType,
const char *file) {
GLuint shader = glCreateShader(shaderType);
if (!shader || shader == GL_INVALID_ENUM) {
EGL_LOG(Error, "Can't create shader: %d", glGetError());
return 0;
}
auto sourceData = Path::readDataFile(file);
GLint len = sourceData.size();
const char *buf = sourceData.data();
glShaderSource(shader, 1, &buf, &len);
glCompileShader(shader);
GLint status;
glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
if (!status) {
char shaderLog[512];
glGetShaderInfoLog(shader, sizeof (shaderLog), nullptr, shaderLog);
EGL_LOG(Error, "Cannot load shader \"%s\": %s", file, shaderLog);
return 0;
}
return shader;
}
bool EGLRenderer::openDisplay(unsigned int platform, void* nativeDisplay)
{
PFNEGLGETPLATFORMDISPLAYPROC eglGetPlatformDisplayProc;
PFNEGLGETPLATFORMDISPLAYEXTPROC eglGetPlatformDisplayEXTProc;
m_EGLDisplay = EGL_NO_DISPLAY;
// NB: eglGetPlatformDisplay() and eglGetPlatformDisplayEXT() have slightly different definitions
eglGetPlatformDisplayProc = (typeof(eglGetPlatformDisplayProc))eglGetProcAddress("eglGetPlatformDisplay");
eglGetPlatformDisplayEXTProc = (typeof(eglGetPlatformDisplayEXTProc))eglGetProcAddress("eglGetPlatformDisplayEXT");
if (m_EGLDisplay == EGL_NO_DISPLAY) {
// eglGetPlatformDisplay() is part of the EGL 1.5 core specification
if (eglGetPlatformDisplayProc != nullptr) {
m_EGLDisplay = eglGetPlatformDisplayProc(platform, nativeDisplay, nullptr);
if (m_EGLDisplay == EGL_NO_DISPLAY) {
EGL_LOG(Warn, "eglGetPlatformDisplay() failed: %d", eglGetError());
}
}
}
if (m_EGLDisplay == EGL_NO_DISPLAY) {
// eglGetPlatformDisplayEXT() is an extension for EGL 1.4
const EGLExtensions eglExtensions(EGL_NO_DISPLAY);
if (eglExtensions.isSupported("EGL_EXT_platform_base")) {
if (eglGetPlatformDisplayEXTProc != nullptr) {
m_EGLDisplay = eglGetPlatformDisplayEXTProc(platform, nativeDisplay, nullptr);
if (m_EGLDisplay == EGL_NO_DISPLAY) {
EGL_LOG(Warn, "eglGetPlatformDisplayEXT() failed: %d", eglGetError());
}
}
else {
EGL_LOG(Warn, "EGL_EXT_platform_base supported but no eglGetPlatformDisplayEXT() export!");
}
}
}
if (m_EGLDisplay == EGL_NO_DISPLAY) {
// Finally, if all else fails, use eglGetDisplay()
m_EGLDisplay = eglGetDisplay((EGLNativeDisplayType)nativeDisplay);
if (m_EGLDisplay == EGL_NO_DISPLAY) {
EGL_LOG(Error, "eglGetDisplay() failed: %d", eglGetError());
}
}
return m_EGLDisplay != EGL_NO_DISPLAY;
}
bool EGLRenderer::compileShader() {
SDL_assert(!m_ShaderProgram);
SDL_assert(m_SwPixelFormat != AV_PIX_FMT_NONE);
// XXX: TODO: other formats
SDL_assert(m_SwPixelFormat == AV_PIX_FMT_NV12);
bool ret = false;
GLuint vertexShader = loadAndBuildShader(GL_VERTEX_SHADER, "egl.vert");
if (!vertexShader)
return false;
GLuint fragmentShader = loadAndBuildShader(GL_FRAGMENT_SHADER, "egl.frag");
if (!fragmentShader)
goto fragError;
m_ShaderProgram = glCreateProgram();
if (!m_ShaderProgram) {
EGL_LOG(Error, "Cannot create shader program");
goto progFailCreate;
}
glAttachShader(m_ShaderProgram, vertexShader);
glAttachShader(m_ShaderProgram, fragmentShader);
glLinkProgram(m_ShaderProgram);
int status;
glGetProgramiv(m_ShaderProgram, GL_LINK_STATUS, &status);
if (status) {
ret = true;
} else {
char shader_log[512];
glGetProgramInfoLog(m_ShaderProgram, sizeof (shader_log), nullptr, shader_log);
EGL_LOG(Error, "Cannot link shader program: %s", shader_log);
glDeleteProgram(m_ShaderProgram);
m_ShaderProgram = 0;
}
progFailCreate:
glDeleteShader(fragmentShader);
fragError:
glDeleteShader(vertexShader);
return ret;
}
bool EGLRenderer::initialize(PDECODER_PARAMETERS params)
{
m_Window = params->window;
if (params->videoFormat == VIDEO_FORMAT_H265_MAIN10) {
// EGL doesn't support rendering YUV 10-bit textures yet
return false;
}
// It's not safe to attempt to opportunistically create a GLES2
// renderer prior to 2.0.10. If GLES2 isn't available, SDL will
// attempt to dereference a null pointer and crash Moonlight.
// https://bugzilla.libsdl.org/show_bug.cgi?id=4350
// https://hg.libsdl.org/SDL/rev/84618d571795
if (!SDL_VERSION_ATLEAST(2, 0, 10)) {
EGL_LOG(Error, "Not supported until SDL 2.0.10");
return false;
}
/*
* Create a dummy renderer in order to craft an accelerated SDL Window.
* Request opengl ES 3.0 context, otherwise it will SIGSEGV
* https://gitlab.freedesktop.org/mesa/mesa/issues/1011
*/
SDL_SetHint(SDL_HINT_OPENGL_ES_DRIVER, "1");
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
int renderIndex;
int maxRenderers = SDL_GetNumRenderDrivers();
SDL_assert(maxRenderers >= 0);
SDL_RendererInfo renderInfo;
for (renderIndex = 0; renderIndex < maxRenderers; ++renderIndex) {
if (SDL_GetRenderDriverInfo(renderIndex, &renderInfo))
continue;
if (!strcmp(renderInfo.name, "opengles2")) {
SDL_assert(renderInfo.flags & SDL_RENDERER_ACCELERATED);
break;
}
}
if (renderIndex == maxRenderers) {
EGL_LOG(Error, "Could not find a suitable SDL_Renderer");
return false;
}
if (!(m_DummyRenderer = SDL_CreateRenderer(m_Window, renderIndex, SDL_RENDERER_ACCELERATED))) {
EGL_LOG(Error, "SDL_CreateRenderer() failed: %s", SDL_GetError());
return false;
}
SDL_SysWMinfo info;
SDL_VERSION(&info.version);
if (!SDL_GetWindowWMInfo(params->window, &info)) {
EGL_LOG(Error, "SDL_GetWindowWMInfo() failed: %s", SDL_GetError());
return false;
}
switch (info.subsystem) {
#ifdef SDL_VIDEO_DRIVER_WAYLAND
case SDL_SYSWM_WAYLAND:
if (!openDisplay(EGL_PLATFORM_WAYLAND_KHR, info.info.wl.display)) {
return false;
}
break;
#endif
#ifdef SDL_VIDEO_DRIVER_X11
case SDL_SYSWM_X11:
if (!openDisplay(EGL_PLATFORM_X11_KHR, info.info.x11.display)) {
return false;
}
break;
#endif
default:
EGL_LOG(Error, "not compatible with SYSWM");
return false;
}
if (m_EGLDisplay == EGL_NO_DISPLAY) {
EGL_LOG(Error, "Cannot get EGL display: %d", eglGetError());
return false;
}
if (!(m_Context = SDL_GL_CreateContext(params->window))) {
EGL_LOG(Error, "Cannot create OpenGL context: %s", SDL_GetError());
return false;
}
if (SDL_GL_MakeCurrent(params->window, m_Context)) {
EGL_LOG(Error, "Cannot use created EGL context: %s", SDL_GetError());
return false;
}
const EGLExtensions eglExtensions(m_EGLDisplay);
if (!eglExtensions.isSupported("EGL_KHR_image_base") &&
!eglExtensions.isSupported("EGL_KHR_image")) {
EGL_LOG(Error, "EGL_KHR_image unsupported");
return false;
}
else if (!SDL_GL_ExtensionSupported("GL_OES_EGL_image")) {
EGL_LOG(Error, "GL_OES_EGL_image unsupported");
return false;
}
if (!m_Backend->initializeEGL(m_EGLDisplay, eglExtensions))
return false;
if (!(m_glEGLImageTargetTexture2DOES = (typeof(m_glEGLImageTargetTexture2DOES))eglGetProcAddress("glEGLImageTargetTexture2DOES"))) {
EGL_LOG(Error,
"EGL: cannot retrieve `glEGLImageTargetTexture2DOES` address");
return false;
}
// Vertex arrays are an extension on OpenGL ES 2.0
if (SDL_GL_ExtensionSupported("GL_OES_vertex_array_object")) {
m_glGenVertexArraysOES = (typeof(m_glGenVertexArraysOES))eglGetProcAddress("glGenVertexArraysOES");
m_glBindVertexArrayOES = (typeof(m_glBindVertexArrayOES))eglGetProcAddress("glBindVertexArrayOES");
m_glDeleteVertexArraysOES = (typeof(m_glDeleteVertexArraysOES))eglGetProcAddress("glDeleteVertexArraysOES");
}
else {
// They are included in OpenGL ES 3.0 as part of the standard
m_glGenVertexArraysOES = (typeof(m_glGenVertexArraysOES))eglGetProcAddress("glGenVertexArrays");
m_glBindVertexArrayOES = (typeof(m_glBindVertexArrayOES))eglGetProcAddress("glBindVertexArray");
m_glDeleteVertexArraysOES = (typeof(m_glDeleteVertexArraysOES))eglGetProcAddress("glDeleteVertexArrays");
}
if (!m_glGenVertexArraysOES || !m_glBindVertexArrayOES || !m_glDeleteVertexArraysOES) {
EGL_LOG(Error, "Failed to find VAO functions");
return false;
}
/* Compute the video region size in order to keep the aspect ratio of the
* video stream.
*/
SDL_Rect src, dst;
src.x = src.y = dst.x = dst.y = 0;
src.w = params->width;
src.h = params->height;
SDL_GetWindowSize(m_Window, &dst.w, &dst.h);
StreamUtils::scaleSourceToDestinationSurface(&src, &dst);
glViewport(dst.x, dst.y, dst.w, dst.h);
glClearColor(0, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
if (params->enableVsync) {
// Try to use adaptive VSYNC unless we're using frame pacing.
// Frame pacing relies on us blocking in renderFrame() to
// match the display refresh rate.
if (params->enableFramePacing || SDL_GL_SetSwapInterval(-1)) {
SDL_GL_SetSwapInterval(1);
m_BlockingSwapBuffers = true;
}
} else {
SDL_GL_SetSwapInterval(0);
}
SDL_GL_SwapWindow(params->window);
glGenTextures(EGL_MAX_PLANES, m_Textures);
for (size_t i = 0; i < EGL_MAX_PLANES; ++i) {
glBindTexture(GL_TEXTURE_EXTERNAL_OES, m_Textures[i]);
glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
GLenum err = glGetError();
if (err != GL_NO_ERROR)
EGL_LOG(Error, "OpenGL error: %d", err);
// Detach the context from this thread, so the render thread can attach it
SDL_GL_MakeCurrent(m_Window, nullptr);
return err == GL_NO_ERROR;
}
const float *EGLRenderer::getColorMatrix() {
/* The conversion matrices are shamelessly stolen from linux:
* drivers/media/platform/imx-pxp.c:pxp_setup_csc
*/
static const float bt601Lim[] = {
1.1644f, 1.1644f, 1.1644f,
0.0f, -0.3917f, 2.0172f,
1.5960f, -0.8129f, 0.0f
};
static const float bt601Full[] = {
1.0f, 1.0f, 1.0f,
0.0f, -0.3441f, 1.7720f,
1.4020f, -0.7141f, 0.0f
};
static const float bt709Lim[] = {
1.1644f, 1.1644f, 1.1644f,
0.0f, -0.2132f, 2.1124f,
1.7927f, -0.5329f, 0.0f
};
static const float bt709Full[] = {
1.0f, 1.0f, 1.0f,
0.0f, -0.1873f, 1.8556f,
1.5748f, -0.4681f, 0.0f
};
static const float bt2020Lim[] = {
1.1644f, 1.1644f, 1.1644f,
0.0f, -0.1874f, 2.1418f,
1.6781f, -0.6505f, 0.0f
};
static const float bt2020Full[] = {
1.0f, 1.0f, 1.0f,
0.0f, -0.1646f, 1.8814f,
1.4746f, -0.5714f, 0.0f
};
switch (m_ColorSpace) {
case AVCOL_SPC_SMPTE170M:
case AVCOL_SPC_BT470BG:
EGL_LOG(Info, "BT-601 pixels");
return m_ColorFull ? bt601Full : bt601Lim;
case AVCOL_SPC_BT709:
EGL_LOG(Info, "BT-709 pixels");
return m_ColorFull ? bt709Full : bt709Lim;
case AVCOL_SPC_BT2020_NCL:
case AVCOL_SPC_BT2020_CL:
EGL_LOG(Info, "BT-2020 pixels");
return m_ColorFull ? bt2020Full : bt2020Lim;
};
EGL_LOG(Warn, "unknown color space: %d, falling back to BT-601",
m_ColorSpace);
return bt601Lim;
}
bool EGLRenderer::specialize() {
SDL_assert(!m_VAO);
// Attach our GL context to the render thread
SDL_GL_MakeCurrent(m_Window, m_Context);
if (!compileShader())
return false;
// The viewport should have the aspect ratio of the video stream
static const float vertices[] = {
// pos .... // tex coords
1.0f, 1.0f, 1.0f, 0.0f,
1.0f, -1.0f, 1.0f, 1.0f,
-1.0f, -1.0f, 0.0f, 1.0f,
-1.0f, 1.0f, 0.0f, 0.0f,
};
static const unsigned int indices[] = {
0, 1, 3,
1, 2, 3,
};
glUseProgram(m_ShaderProgram);
unsigned int VBO, EBO;
m_glGenVertexArraysOES(1, &m_VAO);
glGenBuffers(1, &VBO);
glGenBuffers(1, &EBO);
m_glBindVertexArrayOES(m_VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof (vertices), vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof (indices), indices, GL_STATIC_DRAW);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)(2 * sizeof (float)));
glEnableVertexAttribArray(1);
glBindBuffer(GL_ARRAY_BUFFER, 0);
m_glBindVertexArrayOES(0);
int yuvmatLocation = glGetUniformLocation(m_ShaderProgram, "yuvmat");
glUniformMatrix3fv(yuvmatLocation, 1, GL_FALSE, getColorMatrix());
static const float limitedOffsets[] = { 16.0f / 255.0f, 128.0f / 255.0f, 128.0f / 255.0f };
static const float fullOffsets[] = { 0.0f, 128.0f / 255.0f, 128.0f / 255.0f };
int offLocation = glGetUniformLocation(m_ShaderProgram, "offset");
glUniform3fv(offLocation, 1, m_ColorFull ? fullOffsets : limitedOffsets);
int colorPlane = glGetUniformLocation(m_ShaderProgram, "plane1");
glUniform1i(colorPlane, 0);
colorPlane = glGetUniformLocation(m_ShaderProgram, "plane2");
glUniform1i(colorPlane, 1);
glDeleteBuffers(1, &VBO);
glDeleteBuffers(1, &EBO);
GLenum err = glGetError();
if (err != GL_NO_ERROR) {
EGL_LOG(Error, "OpenGL error: %d", err);
}
return err == GL_NO_ERROR;
}
void EGLRenderer::renderFrame(AVFrame* frame)
{
EGLImage imgs[EGL_MAX_PLANES];
if (frame == nullptr) {
// End of stream - unbind the GL context
SDL_GL_MakeCurrent(m_Window, nullptr);
return;
}
if (frame->hw_frames_ctx != nullptr) {
// Find the native read-back format and load the shader
if (m_SwPixelFormat == AV_PIX_FMT_NONE) {
auto hwFrameCtx = (AVHWFramesContext*)frame->hw_frames_ctx->data;
m_SwPixelFormat = hwFrameCtx->sw_format;
SDL_assert(m_SwPixelFormat != AV_PIX_FMT_NONE);
EGL_LOG(Info, "Selected read-back format: %d", m_SwPixelFormat);
// XXX: TODO: Handle other pixel formats
SDL_assert(m_SwPixelFormat == AV_PIX_FMT_NV12);
m_ColorSpace = frame->colorspace;
m_ColorFull = frame->color_range == AVCOL_RANGE_JPEG;
if (!specialize()) {
m_SwPixelFormat = AV_PIX_FMT_NONE;
return;
}
}
ssize_t plane_count = m_Backend->exportEGLImages(frame, m_EGLDisplay, imgs);
if (plane_count < 0)
return;
for (ssize_t i = 0; i < plane_count; ++i) {
glActiveTexture(GL_TEXTURE0 + i);
glBindTexture(GL_TEXTURE_EXTERNAL_OES, m_Textures[i]);
m_glEGLImageTargetTexture2DOES(GL_TEXTURE_EXTERNAL_OES, imgs[i]);
}
} else {
// TODO: load texture for SW decoding ?
EGL_LOG(Error, "EGL rendering only supports hw frames");
return;
}
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(m_ShaderProgram);
m_glBindVertexArrayOES(m_VAO);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
SDL_GL_SwapWindow(m_Window);
if (m_BlockingSwapBuffers) {
// This glClear() forces us to block until the buffer swap is
// complete to continue rendering. Mesa won't actually wait
// for the swap with just glFinish() alone. Waiting here keeps us
// in lock step with the display refresh rate. If we don't wait
// here, we'll stall on the first GL call next frame. Doing the
// wait here instead allows more time for a newer frame to arrive
// for next renderFrame() call.
glClear(GL_COLOR_BUFFER_BIT);
glFinish();
}
if (frame->hw_frames_ctx != nullptr)
m_Backend->freeEGLImages(m_EGLDisplay, imgs);
}
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