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Create offscreen context at startup and reuse it.

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This commit is contained in:
Leonardo Zide
2021-01-01 18:41:28 -08:00
parent 6b2f8fa68c
commit 72763ddc11
9 changed files with 143 additions and 58 deletions
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common/lc_context.cpp
+74 -7
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@@ -27,6 +27,10 @@
#define GL_STATIC_DRAW_ARB GL_STATIC_DRAW
#endif
#ifdef LC_USE_QOPENGLWIDGET
std::unique_ptr<QOpenGLContext> lcContext::mOffscreenContext;
std::unique_ptr<QOffscreenSurface> lcContext::mOffscreenSurface;
#endif
lcProgram lcContext::mPrograms[static_cast<int>(lcMaterialType::Count)];
int lcContext::mValidContexts;
@@ -93,6 +97,47 @@ lcContext::~lcContext()
}
}
#ifdef LC_USE_QOPENGLWIDGET
bool lcContext::CreateOffscreenContext()
{
std::unique_ptr<QOpenGLContext> OffscreenContext(new QOpenGLContext());
if (!OffscreenContext)
return false;
OffscreenContext->setShareContext(QOpenGLContext::globalShareContext());
if (!OffscreenContext->create() || !OffscreenContext->isValid())
return false;
std::unique_ptr<QOffscreenSurface> OffscreenSurface(new QOffscreenSurface());
if (!OffscreenSurface)
return false;
OffscreenSurface->create();
if (!OffscreenSurface->isValid())
return false;
if (!OffscreenContext->makeCurrent(OffscreenSurface.get()))
return false;
mOffscreenContext = std::move(OffscreenContext);
mOffscreenSurface = std::move(OffscreenSurface);
return true;
}
void lcContext::DestroyOffscreenContext()
{
mOffscreenSurface.reset();
mOffscreenContext.reset();
}
#endif
void lcContext::CreateShaderPrograms()
{
const char* ShaderPrefix =
@@ -255,20 +300,33 @@ void lcContext::DestroyResources()
}
}
void lcContext::MakeCurrent()
{
if (mWidget)
mWidget->makeCurrent();
#ifdef LC_USE_QOPENGLWIDGET
void lcContext::SetGLContext(QOpenGLContext* GLContext)
else
mOffscreenContext->makeCurrent(mOffscreenSurface.get());
#endif
}
#ifdef LC_USE_QOPENGLWIDGET
void lcContext::SetGLContext(QOpenGLContext* Context, QOpenGLWidget* Widget)
#else
void lcContext::SetGLContext(const QGLContext* GLContext)
void lcContext::SetGLContext(const QGLContext* Context, QGLWidget* Widget)
#endif
{
mContext = Context;
mWidget = Widget;
#ifdef LC_USE_QOPENGLWIDGET
MakeCurrent();
initializeOpenGLFunctions();
mGLContext = GLContext;
#endif
if (!mValidContexts)
{
lcInitializeGLExtensions(GLContext);
lcInitializeGLExtensions(Context);
// TODO: Find a better place for the grid texture and font
gStringCache.Initialize(this);
@@ -289,6 +347,15 @@ void lcContext::SetGLContext(const QGLContext* GLContext)
mValidContexts++;
}
#ifdef LC_USE_QOPENGLWIDGET
void lcContext::SetOffscreenContext()
{
SetGLContext(mOffscreenContext.get(), nullptr);
}
#endif
void lcContext::SetDefaultState()
{
#ifdef LC_USE_QOPENGLWIDGET
@@ -610,7 +677,7 @@ void lcContext::ClearFramebuffer()
return;
#ifdef LC_USE_QOPENGLWIDGET
glBindFramebuffer(GL_FRAMEBUFFER, mGLContext->defaultFramebufferObject());
glBindFramebuffer(GL_FRAMEBUFFER, mContext->defaultFramebufferObject());
#else
if (gSupportsFramebufferObjectARB)
glBindFramebuffer(GL_FRAMEBUFFER, 0);
@@ -664,7 +731,7 @@ lcFramebuffer lcContext::CreateFramebuffer(int Width, int Height, bool Depth, bo
#ifdef LC_USE_QOPENGLWIDGET
else
{
QOpenGLFunctions_3_2_Core* Funcs = mGLContext->versionFunctions<QOpenGLFunctions_3_2_Core>();
QOpenGLFunctions_3_2_Core* Funcs = mContext->versionFunctions<QOpenGLFunctions_3_2_Core>();
BindTexture2DMS(Framebuffer.mColorTexture);
Funcs->glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, Samples, GL_RGBA, Width, Height, GL_TRUE);
@@ -824,7 +891,7 @@ void lcContext::GetRenderFramebufferImage(const std::pair<lcFramebuffer, lcFrame
glBindFramebuffer(GL_READ_FRAMEBUFFER, RenderFramebuffer.first.mObject);
#ifdef LC_USE_QOPENGLWIDGET
QOpenGLFunctions_3_2_Core* Funcs = mGLContext->versionFunctions<QOpenGLFunctions_3_2_Core>();
QOpenGLFunctions_3_2_Core* Funcs = mContext->versionFunctions<QOpenGLFunctions_3_2_Core>();
Funcs->glBlitFramebuffer(0, 0, Width, Height, 0, 0, Width, Height, GL_COLOR_BUFFER_BIT, GL_LINEAR);
#else
glBlitFramebuffer(0, 0, Width, Height, 0, 0, Width, Height, GL_COLOR_BUFFER_BIT, GL_LINEAR);