/// <summary>
/// Updates the dynamic effect if the shader code has changed
/// </summary>
/// <param name="graphicsDevice">The current <see cref="GraphicsDevice"/></param>
private void UpdateEffect(GraphicsDevice graphicsDevice)
{
if (effectCompilationAttemptCountdown > 0)
{
effectCompilationAttemptCountdown--;
return;
}
try
{
effectCompiler.Update(effectInstance, null);
}
catch (Exception)
{
// If the compilation fails do not update the current effect and try again later
effectCompilationAttemptCountdown = 30; // Try again in 30 frames
VertexLayoutHasChanged = false;
return;
}
effect = effectInstance.Effect;
NewParameterCollections.Clear();
NewParameterCollections.AddRange(ParameterCollections.ToArray());
// Get or create parameter collection
if (parameterCollectionGroup == null || parameterCollectionGroup.Effect != effect || !ArrayExtensions.ArraysReferenceEqual(ref OldParameterCollections, ref NewParameterCollections))
{
// It is quite inefficient if user is often switching effect without providing a matching ParameterCollectionGroup
parameterCollectionGroup = new EffectParameterCollectionGroup(graphicsDevice, effect, ParameterCollections.ToArray());
OldParameterCollections.Clear();
OldParameterCollections.AddRange(NewParameterCollections);
}
}
protected override void DrawCore()
{
// Dynamically update/compile the effect based on the current parameters.
effectCompiler.Update(effectInstance);
// Draw a full screen quad
GraphicsDevice.DrawQuad(effectInstance.Effect, parameterCollections);
}
private void DrawCustomEffect()
{
GraphicsDevice.Clear(GraphicsDevice.BackBuffer, Color.Black);
GraphicsDevice.Clear(GraphicsDevice.DepthStencilBuffer, DepthStencilClearOptions.DepthBuffer);
GraphicsDevice.SetDepthAndRenderTarget(GraphicsDevice.DepthStencilBuffer, GraphicsDevice.BackBuffer);
effectParameters.Set(MyCustomShaderKeys.ColorFactor2, (Vector4)Color.Red);
effectParameters.Set(CustomShaderKeys.SwitchEffectLevel, switchEffectLevel);
effectParameters.Set(TexturingKeys.Texture0, UVTexture);
switchEffectLevel++; // TODO: Add switch Effect to test and capture frames
dynamicEffectCompiler.Update(effectInstance, null);
parameterCollection = new EffectParameterCollectionGroup(GraphicsDevice, effectInstance.Effect, new[] { effectParameters });
GraphicsDevice.DrawQuad(effectInstance.Effect, parameterCollection);
}
protected void UpdateEffect()
{
// Dynamically update/compile the effect based on the current parameters.
effectCompiler.Update(EffectInstance, null);
}
