public void ApplyPen(Pen pen, Vector2 position)
{
EffectParameterCollection parameters = IntensityPenEffect.Parameters;
// Transform position coordinates into texture space
position.X /= width;
position.Y /= height;
parameters["pos"].SetValue(position);
parameters["radius"].SetValue(pen.Radius / Math.Max(width, height));
parameters["minPressure"].SetValue(pen.Min);
parameters["maxPressure"].SetValue(pen.Max);
// Pass 1: apply PenEffect to intensityTexture and render out to intensityTextureTemp
GraphicsDevice.Textures[0] = intensityTexture;
ShaderUtil.DrawFullscreenQuad(intensityTexture, intensityTextureTemp, BlendState.Opaque, IntensityPenEffect);
// Pass 2: copy intensityTextureTemp to intensityTexture
ShaderUtil.DrawFullscreenQuad(intensityTextureTemp, intensityTexture, BlendState.Opaque, null);
// Reset the render target
GraphicsDevice.SetRenderTarget(null);
_dirty = true;
}
private void RenderTextures()
{
// Pass 1: copy intensityTexture to intensityTextureCache
ShaderUtil.DrawFullscreenQuad(intensityTexture, intensityTextureCache, BlendState.Opaque, null);
// Pass 2: apply ColorMap to intensityTexture and render out to coloredTextureCache
GraphicsDevice.Textures[0] = intensityTexture;
GraphicsDevice.Textures[1] = colorMaps[colorMapIndex];
ShaderUtil.DrawFullscreenQuad(intensityTexture, coloredTextureCache, BlendState.AlphaBlend, ColorMapEffect);
// Reset the render target
GraphicsDevice.SetRenderTarget(null);
_dirty = false;
}
