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);
}
void Render()
{
// create or resize the bitmap if needed
if (bmp == null || bmp.Size != pictureBox1.Size)
{
bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
field = new Starfield.Field(100_000, bmp.Width, bmp.Height);
stopwatch.Restart();
renderCount = 0;
}
// move the stars forward in time
field.StepForward();
// draw on the bitmap
using (Graphics gfx = Graphics.FromImage(bmp))
{
gfx.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
gfx.Clear(Color.Black);
Brush starBrush = new SolidBrush(Color.White);
foreach (Starfield.Star star in field.stars)
{
gfx.FillEllipse(starBrush, star.X, star.Y, star.Size, star.Size);
}
//gfx.FillRectangle(starBrush, star.X, star.Y, star.Size, star.Size);
}
// apply the new bitmap to the picturebox and force a redraw
pictureBox1.Image = bmp;
// 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);
}