UsdImaging_DefaultTaskDelegate::UsdImaging_DefaultTaskDelegate(
HdRenderIndexSharedPtr const& parentIndex,
SdfPath const& delegateID)
: UsdImagingTaskDelegate(parentIndex, delegateID)
, _viewport(0,0,1,1)
, _selectionColor(1,1,0,1)
{
// create an unique namespace
_rootId = delegateID.AppendChild(
TfToken(TfStringPrintf("_UsdImaging_%p", this)));
_renderTaskId = _rootId.AppendChild(_tokens->renderTask);
_idRenderTaskId = _rootId.AppendChild(_tokens->idRenderTask);
_selectionTaskId = _rootId.AppendChild(_tokens->selectionTask);
_simpleLightTaskId = _rootId.AppendChild(_tokens->simpleLightTask);
_simpleLightBypassTaskId = _rootId.AppendChild(_tokens->simpleLightBypassTask);
_cameraId = _rootId.AppendChild(_tokens->camera);
_activeSimpleLightTaskId = SdfPath();
// TODO: tasks of shadow map generation, accumulation etc will be
// prepared here.
HdRenderIndex &renderIndex = GetRenderIndex();
// camera
{
renderIndex.InsertCamera<HdCamera>(this, _cameraId);
_ValueCache &cache = _valueCacheMap[_cameraId];
cache[HdShaderTokens->worldToViewMatrix] = VtValue(GfMatrix4d(1));
cache[HdShaderTokens->projectionMatrix] = VtValue(GfMatrix4d(1));
cache[HdTokens->cameraFrustum] = VtValue(); // we don't use GfFrustum.
cache[HdTokens->windowPolicy] = VtValue(); // we don't use window policy.
}
// selection task
{
renderIndex.InsertTask<HdxSelectionTask>(this, _selectionTaskId);
_ValueCache &cache = _valueCacheMap[_selectionTaskId];
HdxSelectionTaskParams params;
params.enableSelection = true;
params.selectionColor = _selectionColor;
params.locateColor = GfVec4f(0,0,1,1);
cache[HdTokens->params] = VtValue(params);
cache[HdTokens->children] = VtValue(SdfPathVector());
}
// simple lighting task (for Hydra native)
{
renderIndex.InsertTask<HdxSimpleLightTask>(this, _simpleLightTaskId);
_ValueCache &cache = _valueCacheMap[_simpleLightTaskId];
HdxSimpleLightTaskParams params;
params.cameraPath = _cameraId;
cache[HdTokens->params] = VtValue(params);
cache[HdTokens->children] = VtValue(SdfPathVector());
}
// simple lighting task (for Presto UsdBaseIc compatible)
{
renderIndex.InsertTask<HdxSimpleLightBypassTask>(this,
_simpleLightBypassTaskId);
_ValueCache &cache = _valueCacheMap[_simpleLightBypassTaskId];
HdxSimpleLightBypassTaskParams params;
params.cameraPath = _cameraId;
cache[HdTokens->params] = VtValue(params);
cache[HdTokens->children] = VtValue(SdfPathVector());
}
// render task
_InsertRenderTask(_renderTaskId);
_InsertRenderTask(_idRenderTaskId);
// initialize HdxRenderTaskParams for render tasks
_UpdateCollection(&_rprims, HdTokens->geometry, HdTokens->smoothHull,
SdfPathVector(1, SdfPath::AbsoluteRootPath()),
_renderTaskId,
_idRenderTaskId);
_UpdateRenderParams(_renderParams,
_renderParams,
_renderTaskId);
_UpdateRenderParams(_idRenderParams,
_idRenderParams,
_idRenderTaskId);
}
HdTaskSharedPtr
UsdMayaGLBatchRenderer::TaskDelegate::GetRenderTask(
size_t hash,
RenderParams const &renderParams,
SdfPathVector const &roots)
{
// select bucket
SdfPath renderTaskId;
if( !TfMapLookup(_renderTaskIdMap, hash, &renderTaskId) )
{
// create new render task if not exists
renderTaskId = _rootId.AppendChild(
TfToken(TfStringPrintf("renderTask%zx", hash)));
_InsertRenderTask(renderTaskId);
_renderTaskIdMap[hash] = renderTaskId;
}
//
// XXX: The Maya-Hydra plugin needs refactoring such that the plugin is
// creating a different collection name for each collection it is trying to
// manage. (i.e. Each collection within a frame that has different content
// should have a different collection name)
//
// With Hydra, changing the contents of a collection can be
// an expensive operation as it causes draw batches to be rebuilt.
//
// The Maya-Hydra Plugin is currently reusing the same collection
// name for all collections within a frame.
// (This stems from a time when collection name had a significant meaning
// rather than id'ing a collection).
//
// The plugin should also track deltas to the contents of a collection
// and set Hydra's dirty state when prims get added and removed from
// the collection.
//
// Another possible change that can be made to this code is HdxRenderTask
// now takes an array of collections, so it is possible to support different
// reprs using the same task. Therefore, this code should be modified to
// only add one task that is provided with the active set of collections.
//
// However, a further improvement to the code could be made using
// UsdDelegate's fallback repr feature instead of using multiple
// collections as it would avoid modifying the collection as a Maya shape
// object display state changes. This would result in a much cheaper state
// transition within Hydra itself.
//
TfToken colName = renderParams.geometryCol;
HdRprimCollection rprims(colName, renderParams.drawRepr);
rprims.SetRootPaths(roots);
rprims.SetRenderTags(renderParams.renderTags);
GetRenderIndex().GetChangeTracker().MarkCollectionDirty(colName);
// update value cache
_SetValue(renderTaskId, HdTokens->collection, rprims);
// invalidate
GetRenderIndex().GetChangeTracker().MarkTaskDirty(
renderTaskId, HdChangeTracker::DirtyCollection);
// update render params in the value cache
HdxRenderTaskParams taskParams =
_GetValue<HdxRenderTaskParams>(renderTaskId, HdTokens->params);
// update params
taskParams.overrideColor = renderParams.overrideColor;
taskParams.wireframeColor = renderParams.wireframeColor;
taskParams.enableLighting = renderParams.enableLighting;
taskParams.enableIdRender = false;
taskParams.alphaThreshold = 0.1;
taskParams.tessLevel = 32.0;
const float tinyThreshold = 0.9f;
taskParams.drawingRange = GfVec2f(tinyThreshold, -1.0f);
taskParams.depthBiasUseDefault = true;
taskParams.depthFunc = HdCmpFuncLess;
taskParams.cullStyle = renderParams.cullStyle;
taskParams.geomStyle = HdGeomStylePolygons;
taskParams.enableHardwareShading = true;
// note that taskParams.rprims and taskParams.viewport are not updated
// in this function, and needed to be preserved.
// store into cache
_SetValue(renderTaskId, HdTokens->params, taskParams);
// invalidate
GetRenderIndex().GetChangeTracker().MarkTaskDirty(
renderTaskId, HdChangeTracker::DirtyParams);
return GetRenderIndex().GetTask(renderTaskId);
}