private void InitSkia()
{
if (grContext == null)
{
var glInterface = GRGlInterface.Create();
grContext = GRContext.CreateGl(glInterface);
}
// define the surface properties
// create or update the dimensions
renderTarget?.Dispose();
GL.GetInteger(GetPName.FramebufferBinding, out var framebuffer);
var stencil = 0;
GL.GetInteger(GetPName.Samples, out var samples);
var maxSamples = grContext.GetMaxSurfaceSampleCount(ColorType);
if (samples > maxSamples)
{
samples = maxSamples;
}
var glInfo = new GRGlFramebufferInfo((uint)framebuffer, ColorType.ToGlSizedFormat());
renderTarget = new GRBackendRenderTarget(CurrentSize.X, CurrentSize.Y, 0, 0, glInfo);
// create the surface
surface?.Dispose();
surface = SKSurface.Create(grContext, renderTarget, SurfaceOrigin, ColorType);
Paint = new SKPaint {
Color = new SKColor(0, 128, 0), IsAntialias = true
};
}
protected override void OnRenderFrame(Rect rect)
{
// clear everything
Gles.glClear(Gles.GL_COLOR_BUFFER_BIT | Gles.GL_DEPTH_BUFFER_BIT | Gles.GL_STENCIL_BUFFER_BIT);
// create the SkiaSharp context
if (context == null)
{
glInterface = GRGlInterface.Create();
context = GRContext.CreateGl(glInterface);
}
// get the new surface size
var newSize = new SKSizeI((int)rect.Width, (int)rect.Height);
// manage the drawing surface
if (renderTarget == null || lastSize != newSize || !renderTarget.IsValid)
{
// create or update the dimensions
lastSize = newSize;
// read the info from the buffer
Gles.glGetIntegerv(Gles.GL_FRAMEBUFFER_BINDING, out var framebuffer);
Gles.glGetIntegerv(Gles.GL_STENCIL_BITS, out var stencil);
Gles.glGetIntegerv(Gles.GL_SAMPLES, out var samples);
var maxSamples = context.GetMaxSurfaceSampleCount(colorType);
if (samples > maxSamples)
{
samples = maxSamples;
}
glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
// destroy the old surface
surface?.Dispose();
surface = null;
canvas = null;
// re-create the render target
renderTarget?.Dispose();
renderTarget = new GRBackendRenderTarget(newSize.Width, newSize.Height, samples, stencil, glInfo);
}
// create the surface
if (surface == null)
{
surface = SKSurface.Create(context, renderTarget, surfaceOrigin, colorType);
canvas = surface.Canvas;
}
using (new SKAutoCanvasRestore(canvas, true))
{
// start drawing
OnPaintSurface(new SKPaintGLSurfaceEventArgs(surface, renderTarget, surfaceOrigin, colorType, glInfo));
}
// update the control
canvas.Flush();
context.Flush();
}
public override void DrawRect(CGRect dirtyRect)
{
base.DrawRect(dirtyRect);
Gles.glClear(Gles.GL_COLOR_BUFFER_BIT | Gles.GL_DEPTH_BUFFER_BIT | Gles.GL_STENCIL_BUFFER_BIT);
// create the render target
if (renderTarget == null || lastSize != newSize || !renderTarget.IsValid)
{
// create or update the dimensions
lastSize = newSize;
// read the info from the buffer
Gles.glGetIntegerv(Gles.GL_FRAMEBUFFER_BINDING, out var framebuffer);
Gles.glGetIntegerv(Gles.GL_STENCIL_BITS, out var stencil);
Gles.glGetIntegerv(Gles.GL_SAMPLES, out var samples);
var maxSamples = context.GetMaxSurfaceSampleCount(colorType);
if (samples > maxSamples)
{
samples = maxSamples;
}
glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
// destroy the old surface
surface?.Dispose();
surface = null;
canvas = null;
// re-create the render target
renderTarget?.Dispose();
renderTarget = new GRBackendRenderTarget(newSize.Width, newSize.Height, samples, stencil, glInfo);
}
// create the surface
if (surface == null)
{
surface = SKSurface.Create(context, renderTarget, surfaceOrigin, colorType);
canvas = surface.Canvas;
}
using (new SKAutoCanvasRestore(canvas, true))
{
// start drawing
var e = new SKPaintGLSurfaceEventArgs(surface, renderTarget, surfaceOrigin, colorType, glInfo);
#pragma warning disable CS0618 // Type or member is obsolete
DrawInSurface(e.Surface, e.RenderTarget);
#pragma warning restore CS0618 // Type or member is obsolete
OnPaintSurface(e);
}
// flush the SkiaSharp contents to GL
canvas.Flush();
context.Flush();
OpenGLContext.FlushBuffer();
}
protected sealed override void CreateDrawingSurface()
{
if (glSurface == IntPtr.Zero)
{
// create the surface
glSurface = Evas.evas_gl_surface_create(glEvas, glConfigPtr, surfaceSize.Width, surfaceSize.Height);
// copy the native surface to the image
Evas.evas_gl_native_surface_get(glEvas, glSurface, out var nativeSurface);
Evas.evas_object_image_native_surface_set(evasImage, ref nativeSurface);
// switch to the current OpenGL context
Evas.evas_gl_make_current(glEvas, glSurface, glContext);
// resize the viewport
Gles.glViewport(0, 0, surfaceSize.Width, surfaceSize.Height);
// create the interface using the function pointers provided by the EFL
var glInterface = GRGlInterface.CreateEvas(glEvas);
if (glInterface == null)
{
Log.Error("SKGLSurfaceView", "Unable to create GRGlInterface.");
}
if (!glInterface.Validate())
{
Log.Error("SKGLSurfaceView", "The created GRGlInterface was not valid.");
}
context?.Dispose();
context = GRContext.CreateGl(glInterface);
if (context == null)
{
Log.Error("SKGLSurfaceView", "Unable to create the GRContext.");
}
// create the render target
renderTarget?.Dispose();
Gles.glGetIntegerv(Gles.GL_FRAMEBUFFER_BINDING, out var framebuffer);
Gles.glGetIntegerv(Gles.GL_STENCIL_BITS, out var stencil);
Gles.glGetIntegerv(Gles.GL_SAMPLES, out var samples);
var maxSamples = context.GetMaxSurfaceSampleCount(colorType);
if (samples > maxSamples)
{
samples = maxSamples;
}
glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
renderTarget = new GRBackendRenderTarget(surfaceSize.Width, surfaceSize.Height, samples, stencil, glInfo);
// create the surface
surface?.Dispose();
surface = SKSurface.Create(context, renderTarget, surfaceOrigin, colorType);
canvas = surface.Canvas;
}
}
public override void DrawInCGLContext(CGLContext glContext, CGLPixelFormat pixelFormat, double timeInterval, ref CVTimeStamp timeStamp)
{
CGLContext.CurrentContext = glContext;
if (context == null)
{
// get the bits for SkiaSharp
var glInterface = GRGlInterface.CreateNativeGlInterface();
context = GRContext.Create(GRBackend.OpenGL, glInterface);
}
// manage the drawing surface
var surfaceWidth = (int)(Bounds.Width * ContentsScale);
var surfaceHeight = (int)(Bounds.Height * ContentsScale);
if (renderTarget == null || surface == null || renderTarget.Width != surfaceWidth || renderTarget.Height != surfaceHeight)
{
// create or update the dimensions
renderTarget?.Dispose();
Gles.glGetIntegerv(Gles.GL_FRAMEBUFFER_BINDING, out var framebuffer);
Gles.glGetIntegerv(Gles.GL_STENCIL_BITS, out var stencil);
Gles.glGetIntegerv(Gles.GL_SAMPLES, out var samples);
var maxSamples = context.GetMaxSurfaceSampleCount(colorType);
if (samples > maxSamples)
{
samples = maxSamples;
}
var glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
renderTarget = new GRBackendRenderTarget(surfaceWidth, surfaceHeight, samples, stencil, glInfo);
// create the surface
surface?.Dispose();
surface = SKSurface.Create(context, renderTarget, surfaceOrigin, colorType);
}
using (new SKAutoCanvasRestore(surface.Canvas, true))
{
// start drawing
var e = new SKPaintGLSurfaceEventArgs(surface, renderTarget, surfaceOrigin, colorType);
OnPaintSurface(e);
#pragma warning disable CS0618 // Type or member is obsolete
DrawInSurface(e.Surface, e.RenderTarget);
SKDelegate?.DrawInSurface(e.Surface, e.RenderTarget);
#pragma warning restore CS0618 // Type or member is obsolete
}
// flush the SkiaSharp context to the GL context
surface.Canvas.Flush();
context.Flush();
base.DrawInCGLContext(glContext, pixelFormat, timeInterval, ref timeStamp);
}
public virtual void Render()
{
if (glContext == null)
{
PrepareGLContexts();
}
EAGLContext.SetCurrentContext(glContext);
// manage the drawing surface
if (renderTarget == null || surface == null)
{
// create or update the dimensions
renderTarget?.Dispose();
Gles.glGetIntegerv(Gles.GL_FRAMEBUFFER_BINDING, out var framebuffer);
Gles.glGetIntegerv(Gles.GL_STENCIL_BITS, out var stencil);
Gles.glGetIntegerv(Gles.GL_SAMPLES, out var samples);
var maxSamples = context.GetMaxSurfaceSampleCount(colorType);
if (samples > maxSamples)
{
samples = maxSamples;
}
Gles.glGetRenderbufferParameteriv(Gles.GL_RENDERBUFFER, Gles.GL_RENDERBUFFER_WIDTH, out var bufferWidth);
Gles.glGetRenderbufferParameteriv(Gles.GL_RENDERBUFFER, Gles.GL_RENDERBUFFER_HEIGHT, out var bufferHeight);
var glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
renderTarget = new GRBackendRenderTarget(bufferWidth, bufferHeight, samples, stencil, glInfo);
// create the surface
surface?.Dispose();
surface = SKSurface.Create(context, renderTarget, surfaceOrigin, colorType);
}
using (new SKAutoCanvasRestore(surface.Canvas, true))
{
// start drawing
var e = new SKPaintGLSurfaceEventArgs(surface, renderTarget, surfaceOrigin, colorType);
OnPaintSurface(e);
#pragma warning disable CS0618 // Type or member is obsolete
DrawInSurface(e.Surface, e.RenderTarget);
SKDelegate?.DrawInSurface(e.Surface, e.RenderTarget);
#pragma warning restore CS0618 // Type or member is obsolete
}
// flush the SkiaSharp context to the GL context
surface.Canvas.Flush();
context.Flush();
// present the GL buffers
glContext.PresentRenderBuffer(Gles.GL_RENDERBUFFER);
EAGLContext.SetCurrentContext(null);
}
public ISkiaGpuRenderSession BeginRenderingSession()
{
var glSession = _surface.BeginDraw();
bool success = false;
try
{
var disp = glSession.Context;
var gl = disp.GlInterface;
gl.GetIntegerv(GL_FRAMEBUFFER_BINDING, out var fb);
var size = glSession.Size;
var colorType = SKColorType.Rgba8888;
var scaling = glSession.Scaling;
if (size.Width <= 0 || size.Height <= 0 || scaling < 0)
{
glSession.Dispose();
throw new InvalidOperationException(
$"Can't create drawing context for surface with {size} size and {scaling} scaling");
}
lock (_grContext)
{
_grContext.ResetContext();
var samples = disp.SampleCount;
var maxSamples = _grContext.GetMaxSurfaceSampleCount(colorType);
if (samples > maxSamples)
{
samples = maxSamples;
}
var glInfo = new GRGlFramebufferInfo((uint)fb, colorType.ToGlSizedFormat());
var renderTarget = new GRBackendRenderTarget(size.Width, size.Height, samples, disp.StencilSize, glInfo);
var surface = SKSurface.Create(_grContext, renderTarget,
glSession.IsYFlipped ? GRSurfaceOrigin.TopLeft : GRSurfaceOrigin.BottomLeft,
colorType);
success = true;
return(new GlGpuSession(_grContext, renderTarget, surface, glSession));
}
}
finally
{
if (!success)
{
glSession.Dispose();
}
}
}
protected override void OnPaint(PaintEventArgs e)
{
if (designMode)
{
e.Graphics.Clear(BackColor);
return;
}
base.OnPaint(e);
MakeCurrent();
// create the contexts if not done already
if (grContext == null)
{
var glInterface = GRGlInterface.CreateNativeGlInterface();
grContext = GRContext.Create(GRBackend.OpenGL, glInterface);
}
// manage the drawing surface
if (renderTarget == null || surface == null || renderTarget.Width != Width || renderTarget.Height != Height)
{
// create or update the dimensions
renderTarget?.Dispose();
GL.GetInteger(GetPName.FramebufferBinding, out var framebuffer);
GL.GetInteger(GetPName.StencilBits, out var stencil);
GL.GetInteger(GetPName.Samples, out var samples);
var maxSamples = grContext.GetMaxSurfaceSampleCount(colorType);
if (samples > maxSamples)
{
samples = maxSamples;
}
var glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
renderTarget = new GRBackendRenderTarget(Width, Height, samples, stencil, glInfo);
// create the surface
surface?.Dispose();
surface = SKSurface.Create(grContext, renderTarget, surfaceOrigin, colorType);
}
using (new SKAutoCanvasRestore(surface.Canvas, true))
{
// start drawing
OnPaintSurface(new SKPaintGLSurfaceEventArgs(surface, renderTarget, surfaceOrigin, colorType));
}
// update the control
surface.Canvas.Flush();
SwapBuffers();
}
public new void DrawInRect(GLKView view, CGRect rect)
{
if (designMode)
{
return;
}
// create the contexts if not done already
if (context == null)
{
var glInterface = GRGlInterface.CreateNativeGlInterface();
context = GRContext.Create(GRBackend.OpenGL, glInterface);
}
// manage the drawing surface
if (renderTarget == null || surface == null || renderTarget.Width != DrawableWidth || renderTarget.Height != DrawableHeight)
{
// create or update the dimensions
renderTarget?.Dispose();
Gles.glGetIntegerv(Gles.GL_FRAMEBUFFER_BINDING, out var framebuffer);
Gles.glGetIntegerv(Gles.GL_STENCIL_BITS, out var stencil);
Gles.glGetIntegerv(Gles.GL_SAMPLES, out var samples);
var maxSamples = context.GetMaxSurfaceSampleCount(colorType);
if (samples > maxSamples)
{
samples = maxSamples;
}
var glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
renderTarget = new GRBackendRenderTarget((int)DrawableWidth, (int)DrawableHeight, samples, stencil, glInfo);
// create the surface
surface?.Dispose();
surface = SKSurface.Create(context, renderTarget, surfaceOrigin, colorType);
}
using (new SKAutoCanvasRestore(surface.Canvas, true))
{
// start drawing
var e = new SKPaintGLSurfaceEventArgs(surface, renderTarget, surfaceOrigin, colorType);
OnPaintSurface(e);
#pragma warning disable CS0618 // Type or member is obsolete
DrawInSurface(e.Surface, e.RenderTarget);
#pragma warning restore CS0618 // Type or member is obsolete
}
// flush the SkiaSharp contents to GL
surface.Canvas.Flush();
context.Flush();
}
public void OnDrawFrame(IGL10 gl)
{
GLES10.GlClear(GLES10.GlColorBufferBit | GLES10.GlDepthBufferBit | GLES10.GlStencilBufferBit);
// create the contexts if not done already
if (context == null)
{
var glInterface = GRGlInterface.CreateNativeGlInterface();
context = GRContext.Create(GRBackend.OpenGL, glInterface);
}
// manage the drawing surface
if (renderTarget == null || surface == null || renderTarget.Width != surfaceWidth || renderTarget.Height != surfaceHeight)
{
// create or update the dimensions
renderTarget?.Dispose();
var buffer = new int[3];
GLES20.GlGetIntegerv(GLES20.GlFramebufferBinding, buffer, 0);
GLES20.GlGetIntegerv(GLES20.GlStencilBits, buffer, 1);
GLES20.GlGetIntegerv(GLES20.GlSamples, buffer, 2);
var samples = buffer[2];
var maxSamples = context.GetMaxSurfaceSampleCount(colorType);
if (samples > maxSamples)
{
samples = maxSamples;
}
var glInfo = new GRGlFramebufferInfo((uint)buffer[0], colorType.ToGlSizedFormat());
renderTarget = new GRBackendRenderTarget(surfaceWidth, surfaceHeight, samples, buffer[1], glInfo);
// create the surface
surface?.Dispose();
surface = SKSurface.Create(context, renderTarget, surfaceOrigin, colorType);
}
using (new SKAutoCanvasRestore(surface.Canvas, true))
{
// start drawing
var e = new SKPaintGLSurfaceEventArgs(surface, renderTarget, surfaceOrigin, colorType);
OnPaintSurface(e);
#pragma warning disable CS0618 // Type or member is obsolete
OnDrawFrame(e.Surface, e.RenderTarget);
#pragma warning restore CS0618 // Type or member is obsolete
}
// flush the SkiaSharp contents to GL
surface.Canvas.Flush();
context.Flush();
}
public override void DrawRect(CGRect dirtyRect)
{
base.DrawRect(dirtyRect);
Gles.glClear(Gles.GL_COLOR_BUFFER_BIT | Gles.GL_DEPTH_BUFFER_BIT | Gles.GL_STENCIL_BUFFER_BIT);
// manage the drawing surface
var size = ConvertSizeToBacking(Bounds.Size);
if (renderTarget == null || surface == null || renderTarget.Width != size.Width || renderTarget.Height != size.Height)
{
// create or update the dimensions
renderTarget?.Dispose();
Gles.glGetIntegerv(Gles.GL_FRAMEBUFFER_BINDING, out var framebuffer);
Gles.glGetIntegerv(Gles.GL_STENCIL_BITS, out var stencil);
Gles.glGetIntegerv(Gles.GL_SAMPLES, out var samples);
var maxSamples = context.GetMaxSurfaceSampleCount(colorType);
if (samples > maxSamples)
{
samples = maxSamples;
}
var glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
renderTarget = new GRBackendRenderTarget((int)size.Width, (int)size.Height, samples, stencil, glInfo);
// create the surface
surface?.Dispose();
surface = SKSurface.Create(context, renderTarget, surfaceOrigin, colorType);
}
using (new SKAutoCanvasRestore(surface.Canvas, true))
{
// start drawing
var e = new SKPaintGLSurfaceEventArgs(surface, renderTarget, surfaceOrigin, colorType);
#pragma warning disable CS0618 // Type or member is obsolete
DrawInSurface(e.Surface, e.RenderTarget);
#pragma warning restore CS0618 // Type or member is obsolete
OnPaintSurface(e);
}
// flush the SkiaSharp contents to GL
surface.Canvas.Flush();
context.Flush();
OpenGLContext.FlushBuffer();
}
public GRBackendRenderTarget CreateRenderTarget(GRContext grContext)
{
GL.GetInteger(GetPName.FramebufferBinding, out int framebuffer);
GL.GetInteger(GetPName.StencilBits, out int stencil);
GL.GetInteger(GetPName.Samples, out int samples);
int bufferWidth = 0;
int bufferHeight = 0;
GL.GetRenderbufferParameter(RenderbufferTarget.Renderbuffer, RenderbufferParameterName.RenderbufferWidth,
out bufferWidth);
GL.GetRenderbufferParameter(RenderbufferTarget.Renderbuffer, RenderbufferParameterName.RenderbufferHeight,
out bufferHeight);
var colorType = SKColorType.Rgba8888;
var glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
return(new GRBackendRenderTarget(Width, Height, grContext.GetMaxSurfaceSampleCount(colorType), stencil, glInfo));
}
protected override void OnRenderFrame(Rect rect)
{
// clear everything
Gles.glClear(Gles.GL_COLOR_BUFFER_BIT | Gles.GL_DEPTH_BUFFER_BIT | Gles.GL_STENCIL_BUFFER_BIT);
// create the SkiaSharp context
if (context == null)
{
glInterface = GRGlInterface.CreateNativeAngleInterface();
context = GRContext.Create(GRBackend.OpenGL, glInterface);
}
// manage the drawing surface
if (renderTarget == null || surface == null || renderTarget.Width != (int)rect.Width || renderTarget.Height != (int)rect.Height)
{
// create or update the dimensions
renderTarget?.Dispose();
Gles.glGetIntegerv(Gles.GL_FRAMEBUFFER_BINDING, out var framebuffer);
Gles.glGetIntegerv(Gles.GL_STENCIL_BITS, out var stencil);
Gles.glGetIntegerv(Gles.GL_SAMPLES, out var samples);
var maxSamples = context.GetMaxSurfaceSampleCount(colorType);
if (samples > maxSamples)
samples = maxSamples;
var glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
renderTarget = new GRBackendRenderTarget((int)rect.Width, (int)rect.Height, samples, stencil, glInfo);
// create the surface
surface?.Dispose();
surface = SKSurface.Create(context, renderTarget, surfaceOrigin, colorType);
}
using (new SKAutoCanvasRestore(surface.Canvas, true))
{
// start drawing
OnPaintSurface(new SKPaintGLSurfaceEventArgs(surface, renderTarget, surfaceOrigin, colorType));
}
// update the control
surface.Canvas.Flush();
context.Flush();
}
private void Form1_Load(object sender, EventArgs e)
{
SKColorType colorType = SKColorType.Rgba8888;
contextOpenGL = GRContext.Create(GRBackend.OpenGL, GRGlInterface.CreateNativeGlInterface());
GL.GetInteger(GetPName.FramebufferBinding, out var framebuffer);
GRGlFramebufferInfo glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
GL.GetInteger(GetPName.StencilBits, out var stencilBits);
renderTarget = new GRBackendRenderTarget(
width: skglControl1.Width,
height: skglControl1.Height,
sampleCount: contextOpenGL.GetMaxSurfaceSampleCount(colorType),
stencilBits: stencilBits,
glInfo: glInfo);
surface = SKSurface.Create(
context: contextOpenGL,
renderTarget: renderTarget,
origin: GRSurfaceOrigin.BottomLeft,
colorType: colorType);
}
protected override void OnRenderFrame()
{
// create the contexts if not done already
if (grContext == null)
{
var glInterface = GRGlInterface.Create();
grContext = GRContext.CreateGl(glInterface);
}
// manage the drawing surface
var alloc = Allocation;
var res = (int)Math.Max(1.0, Gdk.Screen.Default.Resolution / 96.0);
var w = Math.Max(0, alloc.Width * res);
var h = Math.Max(0, alloc.Height * res);
if (renderTarget == null || surface == null || renderTarget.Width != w || renderTarget.Height != h)
{
// create or update the dimensions
renderTarget?.Dispose();
GL.GetInteger(GetPName.FramebufferBinding, out var framebuffer);
GL.GetInteger(GetPName.StencilBits, out var stencil);
GL.GetInteger(GetPName.Samples, out var samples);
var maxSamples = grContext.GetMaxSurfaceSampleCount(COLOR_TYPE);
if (samples > maxSamples)
{
samples = maxSamples;
}
var glInfo = new GRGlFramebufferInfo((uint)framebuffer, COLOR_TYPE.ToGlSizedFormat());
renderTarget = new GRBackendRenderTarget(w, h, samples, stencil, glInfo);
// create the surface
surface?.Dispose();
surface = SKSurface.Create(grContext, renderTarget, SURFACE_ORIGIN, COLOR_TYPE);
}
using (new SKAutoCanvasRestore(surface.Canvas, true))
{
RenderFrame?.Invoke(this, surface);
}
// update the control
surface.Canvas.Flush();
grContext.Flush();
}
protected void TkRender(TimeSpan delta)
{
if (designMode || disposed)
{
return;
}
if (this.Visibility != Visibility.Visible)
{
return;
}
var size = CreateSize();
if (size.Width <= 0 || size.Height <= 0)
{
return;
}
// create the contexts if not done already
if (grContext == null)
{
var glInterface = GRGlInterface.Create();
grContext = GRContext.CreateGl(glInterface);
}
// get the new surface size
var newSize = new SKSizeI(size.Width, size.Height);
// manage the drawing surface
if (renderTarget == null || lastSize != newSize || !renderTarget.IsValid)
{
// create or update the dimensions
lastSize = newSize;
GL.GetInteger(GetPName.FramebufferBinding, out var framebuffer);
GL.GetInteger(GetPName.StencilBits, out var stencil);
GL.GetInteger(GetPName.Samples, out var samples);
var maxSamples = grContext.GetMaxSurfaceSampleCount(colorType);
if (samples > maxSamples)
{
samples = maxSamples;
}
glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
// destroy the old surface
surface?.Dispose();
surface = null;
canvas = null;
// re-create the render target
renderTarget?.Dispose();
renderTarget = new GRBackendRenderTarget(newSize.Width, newSize.Height, samples, stencil, glInfo);
}
// create the surface
if (surface == null)
{
surface = SKSurface.Create(grContext, renderTarget, surfaceOrigin, colorType);
canvas = surface.Canvas;
}
using (new SKAutoCanvasRestore(canvas, true))
{
// start drawing
OnPaintSurface(new SKPaintGLSurfaceEventArgs(surface, renderTarget, surfaceOrigin, colorType, glInfo));
}
// update the control
canvas.Flush();
}
public new void DrawInRect(GLKView view, CGRect rect)
{
#if false
if (designMode)
{
return;
}
#endif
// create the contexts if not done already
if (_context == null)
{
var glInterface = GRGlInterface.CreateNativeGlInterface();
_context = GRContext.Create(GRBackend.OpenGL, glInterface);
}
// manage the drawing surface
if (_renderTarget == null || _surface == null || _renderTarget.Width != DrawableWidth || _renderTarget.Height != DrawableHeight)
{
// create or update the dimensions
_renderTarget?.Dispose();
Gles.glGetIntegerv(Gles.GL_FRAMEBUFFER_BINDING, out int framebuffer);
Gles.glGetIntegerv(Gles.GL_STENCIL_BITS, out int stencil);
var glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
_renderTarget = new GRBackendRenderTarget((int)DrawableWidth, (int)DrawableHeight, _context.GetMaxSurfaceSampleCount(colorType), stencil, glInfo);
// create the surface
_surface?.Dispose();
_surface = SKSurface.Create(_context, _renderTarget, surfaceOrigin, colorType);
}
using (new SKAutoCanvasRestore(_surface.Canvas, true))
{
// start drawing
//var e = new SKPaintGLSurfaceEventArgs(surface, renderTarget, surfaceOrigin, colorType);
PaintSurface(_surface);
}
// flush the SkiaSharp contents to GL
_surface.Canvas.Flush();
_context.Flush();
}
protected override void OnPaint(PaintEventArgs e)
{
if (designMode)
{
e.Graphics.Clear(BackColor);
return;
}
base.OnPaint(e);
MakeCurrent();
// create the contexts if not done already
if (grContext == null)
{
var glInterface = GRGlInterface.Create();
grContext = GRContext.CreateGl(glInterface);
}
// get the new surface size
var newSize = new SKSizeI(Width, Height);
// manage the drawing surface
if (renderTarget == null || lastSize != newSize || !renderTarget.IsValid)
{
// create or update the dimensions
lastSize = newSize;
GL.GetInteger(GetPName.FramebufferBinding, out var framebuffer);
GL.GetInteger(GetPName.StencilBits, out var stencil);
GL.GetInteger(GetPName.Samples, out var samples);
var maxSamples = grContext.GetMaxSurfaceSampleCount(colorType);
if (samples > maxSamples)
{
samples = maxSamples;
}
glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
// destroy the old surface
surface?.Dispose();
surface = null;
canvas = null;
// re-create the render target
renderTarget?.Dispose();
renderTarget = new GRBackendRenderTarget(newSize.Width, newSize.Height, samples, stencil, glInfo);
}
// create the surface
if (surface == null)
{
surface = SKSurface.Create(grContext, renderTarget, surfaceOrigin, colorType);
canvas = surface.Canvas;
}
using (new SKAutoCanvasRestore(canvas, true))
{
// start drawing
#pragma warning disable CS0612 // Type or member is obsolete
OnPaintSurface(new SKPaintGLSurfaceEventArgs(surface, renderTarget, surfaceOrigin, colorType, glInfo));
#pragma warning restore CS0612 // Type or member is obsolete
}
// update the control
canvas.Flush();
SwapBuffers();
}
private void Render(int cornerCount = 100, int maxVisibleDistance = 200)
{
// create the field if needed or if the size changed
if (field == null || field.width != glControl1.Width || field.height != glControl1.Height)
{
field = new IntroAnimation.Field(glControl1.Width, glControl1.Height, cornerCount);
}
// step the field forward in time
field.StepForward(3);
// Create a Skia surface using the OpenGL control
SKColorType colorType = SKColorType.Rgba8888;
GRContext contextOpenGL = GRContext.Create(GRBackend.OpenGL, GRGlInterface.CreateNativeGlInterface());
GL.GetInteger(GetPName.FramebufferBinding, out var framebuffer);
GRGlFramebufferInfo glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
GL.GetInteger(GetPName.StencilBits, out var stencil);
GRBackendRenderTarget renderTarget = new GRBackendRenderTarget(glControl1.Width, glControl1.Height, contextOpenGL.GetMaxSurfaceSampleCount(colorType), stencil, glInfo);
SKSurface surface = SKSurface.Create(contextOpenGL, renderTarget, GRSurfaceOrigin.BottomLeft, colorType);
SKCanvas canvas = surface.Canvas;
// draw the stuff
var bgColor = field.GetBackgroundColor();
canvas.Clear(new SKColor(bgColor.R, bgColor.G, bgColor.B));
// draw circles at every corner
var paint = new SKPaint {
Color = new SKColor(255, 255, 255), IsAntialias = true
};
float radius = 2;
for (int cornerIndex = 0; cornerIndex < field.corners.Length; cornerIndex++)
{
canvas.DrawCircle((float)field.corners[cornerIndex].X, (float)field.corners[cornerIndex].Y, radius, paint);
}
// draw lines between every corner and every other corner
for (int i = 0; i < field.corners.Length; i++)
{
for (int j = 0; j < field.corners.Length; j++)
{
double distance = field.GetDistance(i, j);
if (distance < maxVisibleDistance && distance != 0)
{
SKPoint pt1 = new SKPoint((float)field.corners[i].X, (float)field.corners[i].Y);
SKPoint pt2 = new SKPoint((float)field.corners[j].X, (float)field.corners[j].Y);
double distanceFraction = distance / maxVisibleDistance;
byte alpha = (byte)(255 - distanceFraction * 256);
var linePaint = new SKPaint {
Color = new SKColor(255, 255, 255, alpha), IsAntialias = true
};
canvas.DrawLine(pt1, pt2, linePaint);
}
}
}
// Force a display
surface.Canvas.Flush();
glControl1.SwapBuffers();
// dispose to prevent memory access violations while exiting
renderTarget?.Dispose();
contextOpenGL?.Dispose();
canvas?.Dispose();
surface?.Dispose();
// update the FPS display
Text = field.GetBenchmarkMessage();
}
protected sealed override void CreateDrawingSurface()
{
if (glSurface == IntPtr.Zero)
{
// create the surface
glSurface = Evas.evas_gl_surface_create(glEvas, glConfigPtr, surfaceSize.Width, surfaceSize.Height);
// copy the native surface to the image
Evas.evas_gl_native_surface_get(glEvas, glSurface, out var nativeSurface);
Evas.evas_object_image_native_surface_set(evasImage, ref nativeSurface);
// switch to the current OpenGL context
Evas.evas_gl_make_current(glEvas, glSurface, glContext);
// resize the viewport
Gles.glViewport(0, 0, surfaceSize.Width, surfaceSize.Height);
// create the interface using the function pointers provided by the EFL
var glInterface = GRGlInterface.CreateNativeEvasInterface(glEvas);
context?.Dispose();
context = GRContext.Create(GRBackend.OpenGL, glInterface);
// create the render target
renderTarget?.Dispose();
Gles.glGetIntegerv(Gles.GL_FRAMEBUFFER_BINDING, out var framebuffer);
Gles.glGetIntegerv(Gles.GL_STENCIL_BITS, out var stencil);
var glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
renderTarget = new GRBackendRenderTarget(surfaceSize.Width, surfaceSize.Height, context.GetMaxSurfaceSampleCount(colorType), stencil, glInfo);
// create the surface
surface?.Dispose();
surface = SKSurface.Create(context, renderTarget, surfaceOrigin, colorType);
}
}
private void RenderWithOpenGL(object sender, PaintEventArgs e)
{
Control sctl = (Control)sender;
int width = sctl.Width;
int height = sctl.Height;
// setup the Skia surface using OpenGL
GRContext contextOpenGL = GRContext.Create(GRBackend.OpenGL, GRGlInterface.CreateNativeGlInterface());
GL.GetInteger(GetPName.FramebufferBinding, out var framebuffer);
GRGlFramebufferInfo glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
GL.GetInteger(GetPName.StencilBits, out var stencil);
GRBackendRenderTarget renderTarget = new GRBackendRenderTarget(width, height, contextOpenGL.GetMaxSurfaceSampleCount(colorType), stencil, glInfo);
SKSurface surface = SKSurface.Create(contextOpenGL, renderTarget, GRSurfaceOrigin.BottomLeft, colorType);
// Draw some stuff on the canvas
surface.Canvas.Clear(SKColor.Parse("#FFFFFF")); // adds about 3ms fullscreen
byte alpha = 128;
var paint = new SKPaint();
for (int i = 0; i < 1_000; i++)
{
float x1 = (float)(rand.NextDouble() * width);
float x2 = (float)(rand.NextDouble() * width);
float y1 = (float)(rand.NextDouble() * height);
float y2 = (float)(rand.NextDouble() * height);
paint.Color = new SKColor(
red: (byte)(rand.NextDouble() * 255),
green: (byte)(rand.NextDouble() * 255),
blue: (byte)(rand.NextDouble() * 255),
alpha: alpha
);
surface.Canvas.DrawLine(x1, y1, x2, y2, paint);
}
surface.Canvas.Flush();
glControl1.SwapBuffers();
// prevent memory access violations by disposing before exiting
renderTarget?.Dispose();
contextOpenGL?.Dispose();
surface?.Dispose();
}
void RenderWithSkia()
{
int width = glControl1.Width;
int height = glControl1.Height;
if (field == null || field.width != width || field.height != height)
{
field = new Starfield.Field(100_000, width, height);
}
field.StepForward();
// Create a Skia surface using the OpenGL control
SKColorType colorType = SKColorType.Rgba8888;
GRContext contextOpenGL = GRContext.Create(GRBackend.OpenGL, GRGlInterface.CreateNativeGlInterface());
GL.GetInteger(GetPName.FramebufferBinding, out var framebuffer);
GRGlFramebufferInfo glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
GL.GetInteger(GetPName.StencilBits, out var stencil);
GRBackendRenderTarget renderTarget = new GRBackendRenderTarget(width, height, contextOpenGL.GetMaxSurfaceSampleCount(colorType), stencil, glInfo);
SKSurface surface = SKSurface.Create(contextOpenGL, renderTarget, GRSurfaceOrigin.BottomLeft, colorType);
SKCanvas canvas = surface.Canvas;
// draw the starfield
var paint = new SKPaint
{
Color = SKColors.White,
IsAntialias = true
};
canvas.Clear(SKColors.Black);
foreach (Starfield.Star star in field.stars)
{
//canvas.DrawRect(star.X, star.Y, star.Size, star.Size, paint);
canvas.DrawCircle(new SKPoint(star.X, star.Y), star.Size / 2, paint);
}
// Force a display
surface.Canvas.Flush();
glControl1.SwapBuffers();
// dispose to prevent memory access violations while exiting
renderTarget?.Dispose();
contextOpenGL?.Dispose();
canvas?.Dispose();
surface?.Dispose();
// update the FPS display
renderCount += 1;
double elapsedSeconds = (double)stopwatch.ElapsedMilliseconds / 1000;
Text = string.Format("Rendered {0} frames in {1:0.00} seconds ({2:0.00} Hz)", renderCount, elapsedSeconds, renderCount / elapsedSeconds);
}
private void glControl1_Paint(object sender, PaintEventArgs e)
{
Control senderControl = (Control)sender;
if (context == null)
{
var glInterface = GRGlInterface.CreateNativeGlInterface();
context = GRContext.Create(GRBackend.OpenGL, glInterface);
}
if (renderTarget == null || surface == null || renderTarget.Width != senderControl.Width || renderTarget.Height != senderControl.Height)
{
renderTarget?.Dispose();
GL.GetInteger(GetPName.FramebufferBinding, out var framebuffer);
GL.GetInteger(GetPName.StencilBits, out var stencil);
var glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
renderTarget = new GRBackendRenderTarget(senderControl.Width, senderControl.Height, context.GetMaxSurfaceSampleCount(colorType), stencil, glInfo);
surface?.Dispose();
surface = SKSurface.Create(context, renderTarget, GRSurfaceOrigin.BottomLeft, SKColorType.Rgba8888);
}
figure.Render(surface.Canvas, figureSize, plotEngagedWithMouse);
surface.Canvas.Flush();
glControl1.SwapBuffers();
}
private void Render(int lineCount)
{
Stopwatch stopwatch = Stopwatch.StartNew();
// set up the Skia surface using OpenGL
SKColorType colorType = SKColorType.Rgba8888;
GRContext contextOpenGL = GRContext.Create(GRBackend.OpenGL, GRGlInterface.CreateNativeGlInterface());
GL.GetInteger(GetPName.FramebufferBinding, out var framebuffer);
GRGlFramebufferInfo glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
GL.GetInteger(GetPName.StencilBits, out var stencilBits);
GRBackendRenderTarget renderTarget = new GRBackendRenderTarget(
width: skglControl1.Width,
height: skglControl1.Height,
sampleCount: contextOpenGL.GetMaxSurfaceSampleCount(colorType),
stencilBits: stencilBits,
glInfo: glInfo);
SKSurface surface = SKSurface.Create(
context: contextOpenGL,
renderTarget: renderTarget,
origin: GRSurfaceOrigin.BottomLeft,
colorType: colorType);
// perform the drawing
surface.Canvas.Clear(SKColor.Parse("#003366"));
for (int i = 0; i < lineCount; i++)
{
var paint = new SKPaint
{
Color = new SKColor(
red: (byte)rand.Next(255),
green: (byte)rand.Next(255),
blue: (byte)rand.Next(255),
alpha: (byte)rand.Next(255)),
StrokeWidth = rand.Next(1, 10),
IsAntialias = true
};
surface.Canvas.DrawLine(
x0: rand.Next(skglControl1.Width),
y0: rand.Next(skglControl1.Height),
x1: rand.Next(skglControl1.Width),
y1: rand.Next(skglControl1.Height),
paint: paint);
}
// Force a display
surface.Canvas.Flush();
skglControl1.SwapBuffers();
// prevent memory access violations by disposing before exiting
renderTarget?.Dispose();
contextOpenGL?.Dispose();
surface?.Dispose();
stopwatch.Stop();
renderTimesMsec.Add(1000.0 * stopwatch.ElapsedTicks / Stopwatch.Frequency);
double mean = renderTimesMsec.Sum() / renderTimesMsec.Count();
Debug.WriteLine($"Render {renderTimesMsec.Count:00} " +
$"took {renderTimesMsec.Last():0.000} ms " +
$"(running mean: {mean:0.000} ms)");
Application.DoEvents();
}
void Render()
{
// Create a Skia surface using the OpenGL control
int width = glControl1.Width;
int height = glControl1.Height;
SKColorType colorType = SKColorType.Rgba8888;
GRContext contextOpenGL = GRContext.Create(GRBackend.OpenGL, GRGlInterface.CreateNativeGlInterface());
GL.GetInteger(GetPName.FramebufferBinding, out var framebuffer);
GRGlFramebufferInfo glInfo = new GRGlFramebufferInfo((uint)framebuffer, colorType.ToGlSizedFormat());
GL.GetInteger(GetPName.StencilBits, out var stencil);
GRBackendRenderTarget renderTarget = new GRBackendRenderTarget(width, height, contextOpenGL.GetMaxSurfaceSampleCount(colorType), stencil, glInfo);
SKSurface surface = SKSurface.Create(contextOpenGL, renderTarget, GRSurfaceOrigin.BottomLeft, colorType);
SKCanvas canvas = surface.Canvas;
// draw some lines
canvas.Clear(SKColor.Parse("#003366"));
var paint = new SKPaint
{
Color = new SKColor(255, 255, 255, 50),
IsAntialias = true
};
for (int i = 0; i < 1_000; i++)
{
SKPoint ptA = new SKPoint(rand.Next(width), rand.Next(height));
SKPoint ptB = new SKPoint(rand.Next(width), rand.Next(height));
canvas.DrawLine(ptA, ptB, paint);
}
// Force a display
surface.Canvas.Flush();
glControl1.SwapBuffers();
// dispose to prevent memory access violations while exiting
renderTarget?.Dispose();
contextOpenGL?.Dispose();
canvas?.Dispose();
surface?.Dispose();
// update the FPS display
renderCount += 1;
double elapsedSeconds = (double)stopwatch.ElapsedMilliseconds / 1000;
Text = string.Format("Rendered {0} frames in {1:0.00} seconds ({2:0.00} Hz)", renderCount, elapsedSeconds, renderCount / elapsedSeconds);
}