public IControlRenderer CreateControlRenderer(IView view)
{
var dimensions = new RenderDimensionReference();
dimensions.SetDimensions(view.Size.Width, view.Size.Height);
return(new ControlRenderer(dimensions));
}
public Context(RenderDimensionReference dimensions)
{
// We need at least OpenGL 3.1 for instancing, shaders and primitive restart.
if (State.OpenGLVersionMajor < 3 || (State.OpenGLVersionMajor == 3 && State.OpenGLVersionMinor < 1))
{
throw new NotSupportedException($"OpenGL version 3.1 is required for rendering. Your version is {State.OpenGLVersionMajor}.{State.OpenGLVersionMinor}.");
}
State.Gl.ClearColor(_backgroundColor);
State.Gl.Enable(EnableCap.DepthTest);
State.Gl.DepthFunc(DepthFunction.Lequal);
State.Gl.Disable(EnableCap.Blend); // will be enabled later
State.Gl.BlendEquationSeparate(GLEnum.FuncAdd, GLEnum.FuncAdd);
State.Gl.BlendFuncSeparate(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha, BlendingFactor.One, BlendingFactor.Zero);
Resize(dimensions.Width, dimensions.Height);
dimensions.DimensionsChanged += () => Resize(dimensions.Width, dimensions.Height);
}
public void Render(RenderDimensionReference renderDimensionReference, Color?colorKey = null)
{
State.Gl.Enable(GLEnum.PrimitiveRestart);
State.Gl.PrimitiveRestartIndex(IndexBuffer.PrimitiveRestartIndex);
foreach (var vertexArrayObject in _vertexArrayObjects)
{
var vao = vertexArrayObject.Value;
vao.Bind();
unsafe
{
vao.Lock();
try
{
if (vao.Shader is IShaderWithScreenHeight shader)
{
shader.SetScreenHeight((uint)renderDimensionReference.Height);
}
vao.Shader.UpdateMatrices(false); // TODO: later support zoom?
vao.ColorKey = colorKey;
State.Gl.DrawElements(PrimitiveType.TriangleFan,
(uint)vao.IndexBuffer.Size, DrawElementsType.UnsignedInt, (void *)0);
}
catch
{
// ignore for now
}
finally
{
vao.Unlock();
}
}
}
State.Gl.Disable(GLEnum.PrimitiveRestart);
}
public ControlRenderer(RenderDimensionReference renderDimensionReference)
{
_renderDimensionReference = renderDimensionReference;
_context = new Context(renderDimensionReference);
}