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269 lines
11 KiB
C++
269 lines
11 KiB
C++
//
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// RenderShadowTask.cpp
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// render-utils/src/
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//
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// Created by Zach Pomerantz on 1/7/2016.
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// Copyright 2016 High Fidelity, Inc.
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//
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// Distributed under the Apache License, Version 2.0.
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// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
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//
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#include "RenderShadowTask.h"
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#include <gpu/Context.h>
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#include <ViewFrustum.h>
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#include <render/CullTask.h>
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#include <render/SortTask.h>
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#include <render/DrawTask.h>
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#include "DeferredLightingEffect.h"
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#include "FramebufferCache.h"
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// These values are used for culling the objects rendered in the shadow map
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// but are readjusted afterwards
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#define SHADOW_FRUSTUM_NEAR 1.0f
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#define SHADOW_FRUSTUM_FAR 500.0f
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using namespace render;
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extern void initZPassPipelines(ShapePlumber& plumber, gpu::StatePointer state);
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static void computeNearFar(const Triangle& triangle, const Plane shadowClipPlanes[4], float& near, float& far) {
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static const int MAX_TRIANGLE_COUNT = 16;
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Triangle clippedTriangles[MAX_TRIANGLE_COUNT];
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auto clippedTriangleCount = clipTriangleWithPlanes(triangle, shadowClipPlanes, 4, clippedTriangles, MAX_TRIANGLE_COUNT);
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for (auto i = 0; i < clippedTriangleCount; i++) {
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const auto& clippedTriangle = clippedTriangles[i];
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near = glm::min(near, -clippedTriangle.v0.z);
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near = glm::min(near, -clippedTriangle.v1.z);
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near = glm::min(near, -clippedTriangle.v2.z);
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far = glm::max(far, -clippedTriangle.v0.z);
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far = glm::max(far, -clippedTriangle.v1.z);
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far = glm::max(far, -clippedTriangle.v2.z);
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}
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}
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static void computeNearFar(const glm::vec3 sceneBoundVertices[8], const Plane shadowClipPlanes[4], float& near, float& far) {
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// This code is inspired from Microsoft's CascadedShadowMaps11 sample which is under MIT licence.
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// See https://code.msdn.microsoft.com/windowsdesktop/Direct3D-Shadow-Win32-2d72a4f2/sourcecode?fileId=121915&pathId=1645833187
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// Basically it decomposes the object bounding box in triangles and clips each triangle with the shadow
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// frustum planes. Finally it computes the minimum and maximum depth of the clipped triangle vertices
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// in shadow space to extract the near and far distances of the shadow frustum.
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static const std::array<int[4], 6> boxQuadVertexIndices = { {
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{ TOP_LEFT_FAR, BOTTOM_LEFT_FAR, BOTTOM_RIGHT_FAR, TOP_RIGHT_FAR },
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{ TOP_LEFT_NEAR, BOTTOM_LEFT_NEAR, BOTTOM_RIGHT_NEAR, TOP_RIGHT_NEAR },
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{ TOP_RIGHT_FAR, BOTTOM_RIGHT_FAR, BOTTOM_RIGHT_NEAR, TOP_RIGHT_NEAR },
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{ TOP_LEFT_FAR, BOTTOM_LEFT_FAR, BOTTOM_LEFT_NEAR, TOP_LEFT_NEAR },
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{ BOTTOM_LEFT_FAR, BOTTOM_RIGHT_FAR, BOTTOM_RIGHT_NEAR, BOTTOM_LEFT_NEAR },
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{ TOP_LEFT_FAR, TOP_RIGHT_FAR, TOP_RIGHT_NEAR, TOP_LEFT_NEAR }
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} };
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Triangle triangle;
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for (auto quadVertexIndices : boxQuadVertexIndices) {
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triangle.v0 = sceneBoundVertices[quadVertexIndices[0]];
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triangle.v1 = sceneBoundVertices[quadVertexIndices[1]];
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triangle.v2 = sceneBoundVertices[quadVertexIndices[2]];
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computeNearFar(triangle, shadowClipPlanes, near, far);
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triangle.v1 = sceneBoundVertices[quadVertexIndices[3]];
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computeNearFar(triangle, shadowClipPlanes, near, far);
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}
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}
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static void adjustNearFar(const AABox& inShapeBounds, ViewFrustum& shadowFrustum) {
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const Transform shadowView{ shadowFrustum.getView() };
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const Transform shadowViewInverse{ shadowView.getInverseMatrix() };
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glm::vec3 sceneBoundVertices[8];
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// Keep only the left, right, top and bottom shadow frustum planes as we wish to determine
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// the near and far
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Plane shadowClipPlanes[4];
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int i;
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// The vertices of the scene bounding box are expressed in the shadow frustum's local space
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for (i = 0; i < 8; i++) {
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sceneBoundVertices[i] = shadowViewInverse.transform(inShapeBounds.getVertex(static_cast<BoxVertex>(i)));
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}
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// This indirection array is just a protection in case the ViewFrustum::PlaneIndex enum
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// changes order especially as we don't need to test the NEAR and FAR planes.
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static const ViewFrustum::PlaneIndex planeIndices[4] = {
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ViewFrustum::TOP_PLANE,
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ViewFrustum::BOTTOM_PLANE,
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ViewFrustum::LEFT_PLANE,
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ViewFrustum::RIGHT_PLANE
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};
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// Same goes for the shadow frustum planes.
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for (i = 0; i < 4; i++) {
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const auto& worldPlane = shadowFrustum.getPlanes()[planeIndices[i]];
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// We assume the transform doesn't have a non uniform scale component to apply the
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// transform to the normal without using the correct transpose of inverse, which should be the
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// case for a view matrix.
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auto planeNormal = shadowViewInverse.transformDirection(worldPlane.getNormal());
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auto planePoint = shadowViewInverse.transform(worldPlane.getPoint());
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shadowClipPlanes[i].setNormalAndPoint(planeNormal, planePoint);
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}
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float near = std::numeric_limits<float>::max();
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float far = 0.0f;
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computeNearFar(sceneBoundVertices, shadowClipPlanes, near, far);
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// Limit the far range to the one used originally. There's no point in rendering objects
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// that are not in the view frustum.
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far = glm::min(far, shadowFrustum.getFarClip());
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const auto depthEpsilon = 0.1f;
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auto projMatrix = glm::ortho(-1.0f, 1.0f, -1.0f, 1.0f, near - depthEpsilon, far + depthEpsilon);
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auto shadowProjection = shadowFrustum.getProjection();
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shadowProjection[2][2] = projMatrix[2][2];
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shadowProjection[3][2] = projMatrix[3][2];
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shadowFrustum.setProjection(shadowProjection);
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shadowFrustum.calculate();
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}
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void RenderShadowMap::run(const render::RenderContextPointer& renderContext, const Inputs& inputs) {
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assert(renderContext->args);
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assert(renderContext->args->hasViewFrustum());
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const auto& inShapes = inputs.get0();
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const auto& inShapeBounds = inputs.get1();
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auto lightStage = renderContext->_scene->getStage<LightStage>();
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assert(lightStage);
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auto shadow = lightStage->getCurrentKeyShadow();
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if (!shadow) return;
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const auto& fbo = shadow->framebuffer;
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RenderArgs* args = renderContext->args;
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ShapeKey::Builder defaultKeyBuilder;
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auto adjustedShadowFrustum = args->getViewFrustum();
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// Adjust the frustum near and far depths based on the rendered items bounding box to have
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// the minimal Z range.
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adjustNearFar(inShapeBounds, adjustedShadowFrustum);
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// Reapply the frustum as it has been adjusted
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shadow->setFrustum(adjustedShadowFrustum);
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args->popViewFrustum();
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args->pushViewFrustum(adjustedShadowFrustum);
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gpu::doInBatch(args->_context, [&](gpu::Batch& batch) {
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args->_batch = &batch;
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batch.enableStereo(false);
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glm::ivec4 viewport{0, 0, fbo->getWidth(), fbo->getHeight()};
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batch.setViewportTransform(viewport);
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batch.setStateScissorRect(viewport);
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batch.setFramebuffer(fbo);
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batch.clearFramebuffer(
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gpu::Framebuffer::BUFFER_COLOR0 | gpu::Framebuffer::BUFFER_DEPTH,
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vec4(vec3(1.0, 1.0, 1.0), 0.0), 1.0, 0, true);
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glm::mat4 projMat;
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Transform viewMat;
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args->getViewFrustum().evalProjectionMatrix(projMat);
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args->getViewFrustum().evalViewTransform(viewMat);
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batch.setProjectionTransform(projMat);
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batch.setViewTransform(viewMat, false);
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auto shadowPipeline = _shapePlumber->pickPipeline(args, defaultKeyBuilder);
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auto shadowSkinnedPipeline = _shapePlumber->pickPipeline(args, defaultKeyBuilder.withSkinned());
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std::vector<ShapeKey> skinnedShapeKeys{};
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// Iterate through all inShapes and render the unskinned
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args->_shapePipeline = shadowPipeline;
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batch.setPipeline(shadowPipeline->pipeline);
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for (auto items : inShapes) {
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if (items.first.isSkinned()) {
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skinnedShapeKeys.push_back(items.first);
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} else {
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renderItems(renderContext, items.second);
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}
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}
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// Reiterate to render the skinned
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args->_shapePipeline = shadowSkinnedPipeline;
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batch.setPipeline(shadowSkinnedPipeline->pipeline);
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for (const auto& key : skinnedShapeKeys) {
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renderItems(renderContext, inShapes.at(key));
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}
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args->_shapePipeline = nullptr;
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args->_batch = nullptr;
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});
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}
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void RenderShadowTask::build(JobModel& task, const render::Varying& input, render::Varying& output, CullFunctor cullFunctor) {
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cullFunctor = cullFunctor ? cullFunctor : [](const RenderArgs*, const AABox&) { return true; };
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// Prepare the ShapePipeline
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ShapePlumberPointer shapePlumber = std::make_shared<ShapePlumber>();
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{
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auto state = std::make_shared<gpu::State>();
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state->setCullMode(gpu::State::CULL_BACK);
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state->setDepthTest(true, true, gpu::LESS_EQUAL);
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initZPassPipelines(*shapePlumber, state);
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}
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const auto cachedMode = task.addJob<RenderShadowSetup>("ShadowSetup");
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// CPU jobs:
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// Fetch and cull the items from the scene
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auto shadowFilter = ItemFilter::Builder::visibleWorldItems().withTypeShape().withOpaque().withoutLayered();
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const auto shadowSelection = task.addJob<FetchSpatialTree>("FetchShadowSelection", shadowFilter);
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const auto culledShadowSelection = task.addJob<CullSpatialSelection>("CullShadowSelection", shadowSelection, cullFunctor, RenderDetails::SHADOW, shadowFilter);
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// Sort
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const auto sortedPipelines = task.addJob<PipelineSortShapes>("PipelineSortShadowSort", culledShadowSelection);
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const auto sortedShapesAndBounds = task.addJob<DepthSortShapesAndComputeBounds>("DepthSortShadowMap", sortedPipelines, true);
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// GPU jobs: Render to shadow map
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task.addJob<RenderShadowMap>("RenderShadowMap", sortedShapesAndBounds, shapePlumber);
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task.addJob<RenderShadowTeardown>("ShadowTeardown", cachedMode);
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}
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void RenderShadowTask::configure(const Config& configuration) {
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DependencyManager::get<DeferredLightingEffect>()->setShadowMapEnabled(configuration.enabled);
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// This is a task, so must still propogate configure() to its Jobs
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// Task::configure(configuration);
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}
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void RenderShadowSetup::run(const render::RenderContextPointer& renderContext, Output& output) {
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auto lightStage = renderContext->_scene->getStage<LightStage>();
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assert(lightStage);
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const auto globalShadow = lightStage->getCurrentKeyShadow();
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if (globalShadow) {
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// Cache old render args
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RenderArgs* args = renderContext->args;
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output = args->_renderMode;
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auto nearClip = args->getViewFrustum().getNearClip();
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float nearDepth = -args->_boomOffset.z;
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const float SHADOW_MAX_DISTANCE = 20.0f;
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globalShadow->setKeylightFrustum(args->getViewFrustum(), nearDepth, nearClip + SHADOW_MAX_DISTANCE, SHADOW_FRUSTUM_NEAR, SHADOW_FRUSTUM_FAR);
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// Set the keylight render args
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args->pushViewFrustum(*(globalShadow->getFrustum()));
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args->_renderMode = RenderArgs::SHADOW_RENDER_MODE;
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}
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}
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void RenderShadowTeardown::run(const render::RenderContextPointer& renderContext, const Input& input) {
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RenderArgs* args = renderContext->args;
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// Reset the render args
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args->popViewFrustum();
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args->_renderMode = input;
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};
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