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Small optimization by using squared distance and not distance in depth sort

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Olivier Prat 2018-08-06 08:20:21 +02:00
parent 8eb7ceb66a
commit c56bb9a855
3 changed files with 7 additions and 6 deletions
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4
libraries/render/src/render/SortTask.cpp
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@ -61,9 +61,9 @@ void render::depthSortItems(const RenderContextPointer& renderContext, bool fron
for (auto itemDetails : inItems) { for (auto itemDetails : inItems) {
auto item = scene->getItem(itemDetails.id); auto item = scene->getItem(itemDetails.id);
auto bound = itemDetails.bound; // item.getBound(); auto bound = itemDetails.bound; // item.getBound();
float distance = args->getViewFrustum().distanceToCamera(bound.calcCenter()); float distanceSquared = args->getViewFrustum().distanceToCameraSquared(bound.calcCenter());
itemBoundSorts.emplace_back(ItemBoundSort(distance, distance, distance, itemDetails.id, bound)); itemBoundSorts.emplace_back(ItemBoundSort(distanceSquared, distanceSquared, distanceSquared, itemDetails.id, bound));
} }
// sort against Z // sort against Z

6
libraries/shared/src/ViewFrustum.cpp
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@ -654,10 +654,10 @@ const ViewFrustum::Corners ViewFrustum::getCorners(const float depth) const {
}; };
} }
float ViewFrustum::distanceToCamera(const glm::vec3& point) const { float ViewFrustum::distanceToCameraSquared(const glm::vec3& point) const {
glm::vec3 temp = getPosition() - point; glm::vec3 temp = getPosition() - point;
float distanceToPoint = sqrtf(glm::dot(temp, temp)); float distanceToPointSquared = glm::dot(temp, temp);
return distanceToPoint; return distanceToPointSquared;
} }
void ViewFrustum::evalProjectionMatrix(glm::mat4& proj) const { void ViewFrustum::evalProjectionMatrix(glm::mat4& proj) const {

3
libraries/shared/src/ViewFrustum.h
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@ -127,7 +127,8 @@ public:
bool getProjectedRect(const AABox& box, glm::vec2& bottomLeft, glm::vec2& topRight) const; bool getProjectedRect(const AABox& box, glm::vec2& bottomLeft, glm::vec2& topRight) const;
void getFurthestPointFromCamera(const AACube& box, glm::vec3& furthestPoint) const; void getFurthestPointFromCamera(const AACube& box, glm::vec3& furthestPoint) const;
float distanceToCamera(const glm::vec3& point) const; float distanceToCameraSquared(const glm::vec3& point) const;
float distanceToCamera(const glm::vec3& point) const { return sqrtf(distanceToCameraSquared(point)); }
void evalProjectionMatrix(glm::mat4& proj) const; void evalProjectionMatrix(glm::mat4& proj) const;