/// <summary>
/// Begins using the <see cref="Brush"/> to paint a geometry. Must be followed by a call to the <see cref="Brush.EndUse"/> method
/// </summary>
/// <param name="drawing">The <see cref="Drawing"/> to render</param>
public override void BeginUse(Drawing drawing)
{
Color color;
if (this.Opacity != 1)
{
color = Color.FromArgb((int)(this.Color.A * this.Opacity), this.Color.R, this.Color.G, this.Color.B);
}
else
{
color = this.Color;
}
GL.Color4(color);
}
/// <summary>
/// Begins using the <see cref="Brush"/> to paint a geometry. Must be followed by a call to the <see cref="Brush.EndUse"/> method
/// </summary>
/// <param name="drawing">The <see cref="Drawing"/> to render</param>
public override void BeginUse(Drawing drawing)
{
Rectangle bounds;
//Sets the drawing as the active drawing
this._ActiveDrawing = drawing;
//Make sure that the texture exists
if (this.Texture == null)
{
return;
}
//Load the texture if it hasn't already been done
this.Texture.Load();
//Gets the bounds of the geometry
bounds = drawing.Bounds;
//Clears the buffer
//GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
//Sets the color, that is white with its alpha multiplied by the brush's opacity
GL.Color4(Color.FromArgb((byte)(255 * this.Opacity), 255, 255, 255));
//Clears the stencil
GL.ClearStencil(0);
//Sets the stencil mask to 1
GL.StencilMask(1);
//Enables stencil test
GL.Enable(EnableCap.StencilTest);
//Sets the stencil function to draw the mask
GL.StencilFunc(StencilFunction.Always, 1, 1);
//Sets the stencil operation to draw the mask
GL.StencilOp(StencilOp.Keep, StencilOp.Keep, StencilOp.Replace);
}
/// <summary>
/// Ends using the <see cref="Brush"/>
/// </summary>
public override void EndUse()
{
//Sets the stencil function to draw the masked geometry
GL.StencilFunc(StencilFunction.Equal, 1, 1);
//Sets the stencil operation to draw the masked geometry
GL.StencilOp(StencilOp.Keep, StencilOp.Keep, StencilOp.Keep);
//Enable 2D texturing
GL.Enable(EnableCap.Texture2D);
//Binds the TextureId
GL.BindTexture(TextureTarget.Texture2D, this.Texture.Id);
//Begins rendering the texture
GL.Begin(PrimitiveType.Quads);
//Top left texture coordinate and vertex
GL.TexCoord2(0, 0);
GL.Vertex2(this._ActiveDrawing.Bounds.Left, this._ActiveDrawing.Bounds.Top);
//Top right texture coordinate and vertex
GL.TexCoord2(1, 0);
GL.Vertex2(this._ActiveDrawing.Bounds.Right, this._ActiveDrawing.Bounds.Top);
//Bottom right texture coordinate and vertex
GL.TexCoord2(1, 1);
GL.Vertex2(this._ActiveDrawing.Bounds.Right, this._ActiveDrawing.Bounds.Bottom);
//Bottom left texture coordinate and vertex
GL.TexCoord2(0, 1);
GL.Vertex2(this._ActiveDrawing.Bounds.Left, this._ActiveDrawing.Bounds.Bottom);
//Ends rendering the texture
GL.End();
//Unbinds the texture
GL.BindTexture(TextureTarget.Texture2D, 0);
//Disable 2D texturing
GL.Disable(EnableCap.Texture2D);
//Disable the stencil test
GL.Disable(EnableCap.StencilTest);
//Clears the active drawing
this._ActiveDrawing = null;
}
/// <summary> /// Begins using the <see cref="Brush"/> to render the specified <see cref="Drawing"/>. Must be followed by a call to the <see cref="Brush.EndUse"/> method /// </summary> /// <param name="drawing">The <see cref="Drawing"/> to render</param> public abstract void BeginUse(Drawing drawing);