private void CompileExpressionContext(IEnumerable <VFXContext> contexts,
VFXExpressionContextOption options,
VFXDeviceTarget target,
VFXExpression.Flags forbiddenFlags = VFXExpression.Flags.None)
{
var expressionContext = new VFXExpression.Context(options, m_GlobalEventAttributes);
var contextsToExpressions = target == VFXDeviceTarget.GPU ? m_ContextsToGPUExpressions : m_ContextsToCPUExpressions;
var expressionsToReduced = target == VFXDeviceTarget.GPU ? m_GPUExpressionsToReduced : m_CPUExpressionsToReduced;
foreach (var context in contexts)
{
var mapper = context.GetExpressionMapper(target);
if (mapper != null)
{
foreach (var exp in mapper.expressions)
{
expressionContext.RegisterExpression(exp);
}
contextsToExpressions.Add(context, mapper);
}
}
expressionContext.Compile();
foreach (var exp in expressionContext.RegisteredExpressions)
{
var reduced = expressionContext.GetReduced(exp);
if (expressionsToReduced.ContainsKey(exp))
{
if (reduced != expressionsToReduced[exp])
{
throw new InvalidOperationException("Unexpected diverging expression reduction");
}
continue;
}
expressionsToReduced.Add(exp, reduced);
}
var allReduced = expressionContext.BuildAllReduced();
m_Expressions.UnionWith(allReduced);
foreach (var exp in expressionsToReduced.Values)
{
AddExpressionDataRecursively(m_ExpressionsData, exp);
}
var graphicsBufferUsageType = m_GraphicsBufferUsageType
.Concat(expressionContext.GraphicsBufferUsageType)
.GroupBy(o => o.Key).ToArray();
m_GraphicsBufferUsageType.Clear();
foreach (var expression in graphicsBufferUsageType)
{
var types = expression.Select(o => o.Value);
if (types.Count() != 1)
{
throw new InvalidOperationException("Diverging type usage for GraphicsBuffer : " + types.Select(o => o.ToString()).Aggregate((a, b) => a + b));
}
m_GraphicsBufferUsageType.Add(expression.Key, types.First());
}
}