/*
- * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2021 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include <dali/internal/render/common/render-item.h>
// INTERNAL INCLUDES
-#include <dali/internal/render/renderers/scene-graph-renderer.h>
+#include <dali/internal/common/math.h>
+#include <dali/internal/common/memory-pool-object-allocator.h>
+#include <dali/internal/render/renderers/render-renderer.h>
+namespace
+{
+//Memory pool used to allocate new RenderItems. Memory used by this pool will be released when shutting down DALi
+Dali::Internal::MemoryPoolObjectAllocator<Dali::Internal::SceneGraph::RenderItem> gRenderItemPool;
+} // namespace
namespace Dali
{
-
namespace Internal
{
-
namespace SceneGraph
{
-
-RenderItem::RenderItem()
-: mModelViewMatrix( false ),
- mRenderer( NULL ),
- mDepthIndex(0)
+RenderItem* RenderItem::New()
{
+ return new(gRenderItemPool.AllocateRaw()) RenderItem();
}
-RenderItem::~RenderItem()
-{
-}
-
-void RenderItem::Reset()
-{
- mRenderer = NULL;
-}
-
-void RenderItem::SetRenderer( Renderer* renderer )
-{
- mRenderer = renderer;
-}
-
-const Renderer* RenderItem::GetRenderer() const
+RenderItem::RenderItem()
+: mModelMatrix(false),
+ mModelViewMatrix(false),
+ mColor(Vector4::ZERO),
+ mSize(),
+ mRenderer(nullptr),
+ mNode(nullptr),
+ mTextureSet(nullptr),
+ mDepthIndex(0),
+ mIsOpaque(true),
+ mIsUpdated(false)
{
- return mRenderer;
}
-Matrix& RenderItem::GetModelViewMatrix()
-{
- return mModelViewMatrix;
-}
+RenderItem::~RenderItem() = default;
-const Matrix& RenderItem::GetModelViewMatrix() const
+ClippingBox RenderItem::CalculateViewportSpaceAABB(const Matrix& modelViewMatrix, const Vector3& size, const int viewportWidth, const int viewportHeight)
{
- return mModelViewMatrix;
+ // Calculate extent vector of the AABB:
+ const float halfActorX = size.x * 0.5f;
+ const float halfActorY = size.y * 0.5f;
+
+ // To transform the actor bounds to screen-space, We do a fast, 2D version of a matrix multiply optimized for 2D quads.
+ // This reduces float multiplications from 64 (16 * 4) to 12 (4 * 3).
+ // We create an array of 4 corners and directly initialize the first 3 with the matrix multiplication result of the respective corner.
+ // This causes the construction of the vector arrays contents in-place for optimization.
+ // We place the coords into the array in clockwise order, so we know opposite corners are always i + 2 from corner i.
+ // We skip the 4th corner here as we can calculate that from the other 3, bypassing matrix multiplication.
+ // Note: The below transform methods use a fast (2D) matrix multiply (only 4 multiplications are done).
+ Vector2 corners[4]{Transform2D(modelViewMatrix, -halfActorX, -halfActorY),
+ Transform2D(modelViewMatrix, halfActorX, -halfActorY),
+ Transform2D(modelViewMatrix, halfActorX, halfActorY)};
+
+ // As we are dealing with a rectangle, we can do a fast calculation to get the 4th corner from knowing the other 3 (even if rotated).
+ corners[3] = Vector2(corners[0] + (corners[2] - corners[1]));
+
+ // Calculate the AABB:
+ // We use knowledge that opposite corners will be the max/min of each other. Doing this reduces the normal 12 branching comparisons to 3.
+ // The standard equivalent min/max code of the below would be:
+ // Vector2 AABBmax( std::max( corners[0].x, std::max( corners[1].x, std::max( corners[3].x, corners[2].x ) ) ),
+ // std::max( corners[0].y, std::max( corners[1].y, std::max( corners[3].y, corners[2].y ) ) ) );
+ // Vector2 AABBmin( std::min( corners[0].x, std::min( corners[1].x, std::min( corners[3].x, corners[2].x ) ) ),
+ // std::min( corners[0].y, std::min( corners[1].y, std::min( corners[3].y, corners[2].y ) ) ) );
+ unsigned int smallestX = 0u;
+ // Loop 3 times to find the index of the smallest X value.
+ // Note: We deliberately do NOT unroll the code here as this hampers the compilers output.
+ for(unsigned int i = 1u; i < 4u; ++i)
+ {
+ if(corners[i].x < corners[smallestX].x)
+ {
+ smallestX = i;
+ }
+ }
+
+ // As we are dealing with a rectangle, we can assume opposite corners are the largest.
+ // So without doing min/max branching, we can fetch the min/max values of all the remaining X/Y coords from this one index.
+ Vector4 aabb(corners[smallestX].x, corners[(smallestX + 3u) % 4].y, corners[(smallestX + 2u) % 4].x, corners[(smallestX + 1u) % 4].y);
+
+ // Return the AABB in screen-space pixels (x, y, width, height).
+ // Note: This is a algebraic simplification of: ( viewport.x - aabb.width ) / 2 - ( ( aabb.width / 2 ) + aabb.x ) per axis.
+ Vector4 aabbInScreen(static_cast<float>(viewportWidth) * 0.5f - aabb.z,
+ static_cast<float>(viewportHeight) * 0.5f - aabb.w,
+ static_cast<float>(viewportWidth) * 0.5f - aabb.x,
+ static_cast<float>(viewportHeight) * 0.5f - aabb.y);
+
+ int x = static_cast<int>(floor(aabbInScreen.x));
+ int y = static_cast<int>(floor(aabbInScreen.y));
+ int z = static_cast<int>(roundf(aabbInScreen.z));
+ int w = static_cast<int>(roundf(aabbInScreen.w));
+
+ return ClippingBox(x, y, z - x, w - y);
}
-void RenderItem::SetDepthIndex( int depthIndex )
+void RenderItem::operator delete(void* ptr)
{
- mDepthIndex = depthIndex;
+ gRenderItemPool.Free(static_cast<RenderItem*>(ptr));
}
} // namespace SceneGraph