private void Initialize()
{
if (designMode)
{
return;
}
renderLoopWorker = null;
renderOnceWorker = null;
backingOption = GlesBackingOption.Detroyed;
multisampling = GlesMultisampling.None;
depthFormat = GlesDepthFormat.None;
stencilFormat = GlesStencilFormat.None;
contentsScale = 1;
propertiesChanged = No;
renderbufferWidth = 0;
renderbufferHeight = 0;
Context = null;
DrawInBackground = false;
SizeChanged += OnSizeChanged;
CompositionScaleChanged += OnCompositionChanged;
}
private void CreateSurface(SwapChainPanel panel, int rbWidth, int rbHeight, GlesBackingOption backingOption, GlesMultisampling multisampling, GlesRenderTarget renderTarget)
{
if (panel == null)
{
throw new ArgumentNullException(nameof(panel), "SwapChainPanel parameter is invalid");
}
if (rbWidth == 0 || rbHeight == 0)
{
rbWidth = 320;
rbHeight = 480;
}
// Create a temporary surface so that we can make the context current
int[] surfaceAttributes =
{
Egl.EGL_WIDTH, rbWidth,
Egl.EGL_HEIGHT, rbHeight,
Egl.EGL_FIXED_SIZE_ANGLE, Egl.EGL_TRUE,
// Egl.EGL_ANGLE_SURFACE_RENDER_TO_BACK_BUFFER is part of the same optimization as Egl.EGL_ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER (see above).
// If you have compilation issues with it then please update your Visual Studio templates.
Egl.EGL_ANGLE_SURFACE_RENDER_TO_BACK_BUFFER, Egl.EGL_TRUE,
Egl.EGL_NONE
};
eglSurface = Egl.eglCreateWindowSurface(eglDisplay, eglConfig, panel, surfaceAttributes);
if (eglSurface == Egl.EGL_NO_SURFACE)
{
throw new Exception("Failed to create EGL surface");
}
// Set up swap behavior.
int swapBehavior = backingOption == GlesBackingOption.Retained ? Egl.EGL_BUFFER_PRESERVED : Egl.EGL_BUFFER_DESTROYED;
if (Egl.eglSurfaceAttrib(eglDisplay, eglSurface, Egl.EGL_SWAP_BEHAVIOR, swapBehavior) == Egl.EGL_FALSE)
{
Debug.WriteLine("Unable to set up backbuffer swap behavior, app may experience graphical glitches!");
}
if (multisampling == GlesMultisampling.FourTimes)
{
Gles.glRenderbufferStorageMultisampleANGLE((uint)renderTarget, 4, Gles.GL_BGRA8_EXT, rbWidth, rbHeight);
}
else
{
Gles.glRenderbufferStorage((uint)renderTarget, Gles.GL_BGRA8_EXT, rbWidth, rbHeight);
}
if (CurrentContext == this)
{
Egl.eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext);
}
}
public void SetSurface(
SwapChainPanel swapChainPanel,
int rbWidth, int rbHeight,
GlesBackingOption backingOption = GlesBackingOption.Detroyed,
GlesMultisampling multisampling = GlesMultisampling.None,
GlesRenderTarget renderTarget = GlesRenderTarget.Renderbuffer)
{
if (eglSurface != Egl.EGL_NO_SURFACE)
{
DestroySurface(eglSurface);
eglSurface = Egl.EGL_NO_SURFACE;
}
if (swapChainPanel != null)
{
CreateSurface(swapChainPanel, rbWidth, rbHeight, backingOption, multisampling, renderTarget);
}
}
