overte-thingvellir/libraries/render-utils/src/RenderViewTask.cpp

//
//  RenderViewTask.cpp
//  render-utils/src/
//
//  Created by Sam Gateau on 5/25/2017.
//  Copyright 2017 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//
#include "RenderViewTask.h"

#include "RenderShadowTask.h"
#include "RenderDeferredTask.h"
#include "RenderForwardTask.h"

void RenderViewTask::build(JobModel& task, const render::Varying& input, render::Varying& output, render::CullFunctor cullFunctor, bool isDeferred) {
   // auto items = input.get<Input>();

    // Shadows use an orthographic projection because they are linked to sunlights
    // but the cullFunctor passed is probably tailored for perspective projection and culls too much.
    task.addJob<RenderShadowTask>("RenderShadowTask", [](const RenderArgs* args, const AABox& bounds) {
        // Cull only objects that are too small relatively to shadow frustum
        auto& frustum = args->getViewFrustum();
        auto frustumSize = std::max(frustum.getHeight(), frustum.getWidth());
        const auto boundsRadius = bounds.getDimensions().length();
        const auto relativeBoundRadius = boundsRadius / frustumSize;
        const auto threshold = 1e-3f;
        return relativeBoundRadius > threshold;
        return true;
    });

    const auto items = task.addJob<RenderFetchCullSortTask>("FetchCullSort", cullFunctor);
    assert(items.canCast<RenderFetchCullSortTask::Output>());

    if (isDeferred) {
        task.addJob<RenderDeferredTask>("RenderDeferredTask", items);
    } else {
        task.addJob<RenderForwardTask>("Forward", items);
    }
}