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o3de/Gems/Atom/RPI/Code/External/MaskedOcclusionCulling/MaskedOcclusionCulling.h
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Doug McDiarmid 8623484168 Added Masked Occlusion Culling external files
2021-06-02 19:02:42 -07:00

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////////////////////////////////////////////////////////////////////////////////
// Copyright 2017 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
////////////////////////////////////////////////////////////////////////////////
#pragma once
/*!
* \file MaskedOcclusionCulling.h
* \brief Masked Occlusion Culling
*
* General information
* - Input to all API functions are (x,y,w) clip-space coordinates (x positive left, y positive up, w positive away from camera).
* We entirely skip the z component and instead compute it as 1 / w, see next bullet. For TestRect the input is NDC (x/w, y/w).
* - We use a simple z = 1 / w transform, which is a bit faster than OGL/DX depth transforms. Thus, depth is REVERSED and z = 0 at
* the far plane and z = inf at w = 0. We also have to use a GREATER depth function, which explains why all the conservative
* tests will be reversed compared to what you might be used to (for example zMaxTri >= zMinBuffer is a visibility test)
* - We support different layouts for vertex data (basic AoS and SoA), but note that it's beneficial to store the position data
* as tightly in memory as possible to reduce cache misses. Big strides are bad, so it's beneficial to keep position as a separate
* stream (rather than bundled with attributes) or to keep a copy of the position data for the occlusion culling system.
* - The resolution width must be a multiple of 8 and height a multiple of 4.
* - The hierarchical Z buffer is stored OpenGL-style with the y axis pointing up. This includes the scissor box.
* - This code is only tested with Visual Studio 2015, but should hopefully be easy to port to other compilers.
*/
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Defines used to configure the implementation
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#ifndef QUICK_MASK
/*!
* Configure the algorithm used for updating and merging hierarchical z buffer entries. If QUICK_MASK
* is defined to 1, use the algorithm from the paper "Masked Software Occlusion Culling", which has good
* balance between performance and low leakage. If QUICK_MASK is defined to 0, use the algorithm from
* "Masked Depth Culling for Graphics Hardware" which has less leakage, but also lower performance.
*/
#define QUICK_MASK 1
#endif
#ifndef USE_D3D
/*!
* Configures the library for use with Direct3D (default) or OpenGL rendering. This changes whether the
* screen space Y axis points downwards (D3D) or upwards (OGL), and is primarily important in combination
* with the PRECISE_COVERAGE define, where this is important to ensure correct rounding and tie-breaker
* behaviour. It also affects the ScissorRect screen space coordinates.
*/
#define USE_D3D 1
#endif
#ifndef PRECISE_COVERAGE
/*!
* Define PRECISE_COVERAGE to 1 to more closely match GPU rasterization rules. The increased precision comes
* at a cost of slightly lower performance.
*/
#define PRECISE_COVERAGE 1
#endif
#ifndef USE_AVX512
/*!
* Define USE_AVX512 to 1 to enable experimental AVX-512 support. It's currently mostly untested and only
* validated on simple examples using Intel SDE. Older compilers may not support AVX-512 intrinsics.
*/
#define USE_AVX512 0
#endif
#ifndef CLIPPING_PRESERVES_ORDER
/*!
* Define CLIPPING_PRESERVES_ORDER to 1 to prevent clipping from reordering triangle rasterization
* order; This comes at a cost (approx 3-4%) but removes one source of temporal frame-to-frame instability.
*/
#define CLIPPING_PRESERVES_ORDER 1
#endif
#ifndef ENABLE_STATS
/*!
* Define ENABLE_STATS to 1 to gather various statistics during occlusion culling. Can be used for profiling
* and debugging. Note that enabling this function will reduce performance significantly.
*/
#define ENABLE_STATS 0
#endif
#ifndef MOC_RECORDER_ENABLE
/*!
* Define MOC_RECORDER_ENABLE to 1 to enable frame recorder (see FrameRecorder.h/cpp for details)
*/
#define MOC_RECORDER_ENABLE 0
#endif
#if MOC_RECORDER_ENABLE
#ifndef MOC_RECORDER_ENABLE_PLAYBACK
/*!
* Define MOC_RECORDER_ENABLE_PLAYBACK to 1 to enable compilation of the playback code (not needed
for recording)
*/
#define MOC_RECORDER_ENABLE_PLAYBACK 0
#endif
#endif
#if MOC_RECORDER_ENABLE
#include <mutex>
class FrameRecorder;
#endif // #if MOC_RECORDER_ENABLE
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Masked occlusion culling class
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class MaskedOcclusionCulling
{
public:
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Memory management callback functions
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
typedef void *(*pfnAlignedAlloc)(size_t alignment, size_t size);
typedef void (*pfnAlignedFree) (void *ptr);
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Enums
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
enum Implementation
{
SSE2 = 0,
SSE41 = 1,
AVX2 = 2,
AVX512 = 3
};
enum BackfaceWinding
{
BACKFACE_NONE = 0,
BACKFACE_CW = 1,
BACKFACE_CCW = 2,
};
enum CullingResult
{
VISIBLE = 0x0,
OCCLUDED = 0x1,
VIEW_CULLED = 0x3
};
enum ClipPlanes
{
CLIP_PLANE_NONE = 0x00,
CLIP_PLANE_NEAR = 0x01,
CLIP_PLANE_LEFT = 0x02,
CLIP_PLANE_RIGHT = 0x04,
CLIP_PLANE_BOTTOM = 0x08,
CLIP_PLANE_TOP = 0x10,
CLIP_PLANE_SIDES = (CLIP_PLANE_LEFT | CLIP_PLANE_RIGHT | CLIP_PLANE_BOTTOM | CLIP_PLANE_TOP),
CLIP_PLANE_ALL = (CLIP_PLANE_LEFT | CLIP_PLANE_RIGHT | CLIP_PLANE_BOTTOM | CLIP_PLANE_TOP | CLIP_PLANE_NEAR)
};
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Structs
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/*!
* Used to specify custom vertex layout. Memory offsets to y and z coordinates are set through
* mOffsetY and mOffsetW, and vertex stride is given by mStride. It's possible to configure both
* AoS and SoA layouts. Note that large strides may cause more cache misses and decrease
* performance. It is advisable to store position data as compactly in memory as possible.
*/
struct VertexLayout
{
VertexLayout() {}
VertexLayout(int stride, int offsetY, int offsetZW) :
mStride(stride), mOffsetY(offsetY), mOffsetW(offsetZW) {}
int mStride; //!< byte stride between vertices
int mOffsetY; //!< byte offset from X to Y coordinate
union {
int mOffsetZ; //!< byte offset from X to Z coordinate
int mOffsetW; //!< byte offset from X to W coordinate
};
};
/*!
* Used to control scissoring during rasterization. Note that we only provide coarse scissor support.
* The scissor box x coordinates must be a multiple of 32, and the y coordinates a multiple of 8.
* Scissoring is mainly meant as a means of enabling binning (sort middle) rasterizers in case
* application developers want to use that approach for multithreading.
*/
struct ScissorRect
{
ScissorRect() {}
ScissorRect(int minX, int minY, int maxX, int maxY) :
mMinX(minX), mMinY(minY), mMaxX(maxX), mMaxY(maxY) {}
int mMinX; //!< Screen space X coordinate for left side of scissor rect, inclusive and must be a multiple of 32
int mMinY; //!< Screen space Y coordinate for bottom side of scissor rect, inclusive and must be a multiple of 8
int mMaxX; //!< Screen space X coordinate for right side of scissor rect, <B>non</B> inclusive and must be a multiple of 32
int mMaxY; //!< Screen space Y coordinate for top side of scissor rect, <B>non</B> inclusive and must be a multiple of 8
};
/*!
* Used to specify storage area for a binlist, containing triangles. This struct is used for binning
* and multithreading. The host application is responsible for allocating memory for the binlists.
*/
struct TriList
{
unsigned int mNumTriangles; //!< Maximum number of triangles that may be stored in mPtr
unsigned int mTriIdx; //!< Index of next triangle to be written, clear before calling BinTriangles to start from the beginning of the list
float *mPtr; //!< Scratchpad buffer allocated by the host application
};
/*!
* Statistics that can be gathered during occluder rendering and visibility to aid debugging
* and profiling. Must be enabled by changing the ENABLE_STATS define.
*/
struct OcclusionCullingStatistics
{
struct
{
long long mNumProcessedTriangles; //!< Number of occluder triangles processed in total
long long mNumRasterizedTriangles; //!< Number of occluder triangles passing view frustum and backface culling
long long mNumTilesTraversed; //!< Number of tiles traversed by the rasterizer
long long mNumTilesUpdated; //!< Number of tiles where the hierarchical z buffer was updated
long long mNumTilesMerged; //!< Number of tiles where the hierarchical z buffer was updated
} mOccluders;
struct
{
long long mNumProcessedRectangles; //!< Number of rects processed (TestRect())
long long mNumProcessedTriangles; //!< Number of ocludee triangles processed (TestTriangles())
long long mNumRasterizedTriangles; //!< Number of ocludee triangle passing view frustum and backface culling
long long mNumTilesTraversed; //!< Number of tiles traversed by triangle & rect rasterizers
} mOccludees;
};
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Functions
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/*!
* \brief Creates a new object with default state, no z buffer attached/allocated.
*/
static MaskedOcclusionCulling *Create(Implementation RequestedSIMD = AVX512);
/*!
* \brief Creates a new object with default state, no z buffer attached/allocated.
* \param alignedAlloc Pointer to a callback function used when allocating memory
* \param alignedFree Pointer to a callback function used when freeing memory
*/
static MaskedOcclusionCulling *Create(Implementation RequestedSIMD, pfnAlignedAlloc alignedAlloc, pfnAlignedFree alignedFree);
/*!
* \brief Destroys an object and frees the z buffer memory. Note that you cannot
* use the delete operator, and should rather use this function to free up memory.
*/
static void Destroy(MaskedOcclusionCulling *moc);
/*!
* \brief Sets the resolution of the hierarchical depth buffer. This function will
* re-allocate the current depth buffer (if present). The contents of the
* buffer is undefined until ClearBuffer() is called.
*
* \param witdh The width of the buffer in pixels, must be a multiple of 8
* \param height The height of the buffer in pixels, must be a multiple of 4
*/
virtual void SetResolution(unsigned int width, unsigned int height) = 0;
/*!
* \brief Gets the resolution of the hierarchical depth buffer.
*
* \param witdh Output: The width of the buffer in pixels
* \param height Output: The height of the buffer in pixels
*/
virtual void GetResolution(unsigned int &width, unsigned int &height) const = 0;
/*!
* \brief Returns the tile size for the current implementation.
*
* \param nBinsW Number of vertical bins, the screen is divided into nBinsW x nBinsH
* rectangular bins.
* \param nBinsH Number of horizontal bins, the screen is divided into nBinsW x nBinsH
* rectangular bins.
* \param outBinWidth Output: The width of the single bin in pixels (except for the
* rightmost bin width, which is extended to resolution width)
* \param outBinHeight Output: The height of the single bin in pixels (except for the
* bottommost bin height, which is extended to resolution height)
*/
virtual void ComputeBinWidthHeight(unsigned int nBinsW, unsigned int nBinsH, unsigned int & outBinWidth, unsigned int & outBinHeight) = 0;
/*!
* \brief Sets the distance for the near clipping plane. Default is nearDist = 0.
*
* \param nearDist The distance to the near clipping plane, given as clip space w
*/
virtual void SetNearClipPlane(float nearDist) = 0;
/*!
* \brief Gets the distance for the near clipping plane.
*/
virtual float GetNearClipPlane() const = 0;
/*!
* \brief Clears the hierarchical depth buffer.
*/
virtual void ClearBuffer() = 0;
/*!
* \brief Merge a second hierarchical depth buffer into the main buffer.
*/
virtual void MergeBuffer(MaskedOcclusionCulling* BufferB) = 0;
/*!
* \brief Renders a mesh of occluder triangles and updates the hierarchical z buffer
* with conservative depth values.
*
* This function is optimized for vertex layouts with stride 16 and y and w
* offsets of 4 and 12 bytes, respectively.
*
* \param inVtx Pointer to an array of input vertices, should point to the x component
* of the first vertex. The input vertices are given as (x,y,w) coordinates
* in clip space. The memory layout can be changed using vtxLayout.
* \param inTris Pointer to an array of vertex indices. Each triangle is created
* from three indices consecutively fetched from the array.
* \param nTris The number of triangles to render (inTris must contain atleast 3*nTris
* entries)
* \param modelToClipMatrix all vertices will be transformed by this matrix before
* performing projection. If nullptr is passed the transform step will be skipped
* \param bfWinding Sets triangle winding order to consider backfacing, must be one one
* of (BACKFACE_NONE, BACKFACE_CW and BACKFACE_CCW). Back-facing triangles are culled
* and will not be rasterized. You may use BACKFACE_NONE to disable culling for
* double sided geometry
* \param clipPlaneMask A mask indicating which clip planes should be considered by the
* triangle clipper. Can be used as an optimization if your application can
* determine (for example during culling) that a group of triangles does not
* intersect a certain frustum plane. However, setting an incorrect mask may
* cause out of bounds memory accesses.
* \param vtxLayout A struct specifying the vertex layout (see struct for detailed
* description). For best performance, it is advisable to store position data
* as compactly in memory as possible.
* \return Will return VIEW_CULLED if all triangles are either outside the frustum or
* backface culled, returns VISIBLE otherwise.
*/
virtual CullingResult RenderTriangles(const float *inVtx, const unsigned int *inTris, int nTris, const float *modelToClipMatrix = nullptr, BackfaceWinding bfWinding = BACKFACE_CW, ClipPlanes clipPlaneMask = CLIP_PLANE_ALL, const VertexLayout &vtxLayout = VertexLayout(16, 4, 12)) = 0;
/*!
* \brief Occlusion query for a rectangle with a given depth. The rectangle is given
* in normalized device coordinates where (x,y) coordinates between [-1,1] map
* to the visible screen area. The query uses a GREATER_EQUAL (reversed) depth
* test meaning that depth values equal to the contents of the depth buffer are
* counted as visible.
*
* \param xmin NDC coordinate of the left side of the rectangle.
* \param ymin NDC coordinate of the bottom side of the rectangle.
* \param xmax NDC coordinate of the right side of the rectangle.
* \param ymax NDC coordinate of the top side of the rectangle.
* \param ymax NDC coordinate of the top side of the rectangle.
* \param wmin Clip space W coordinate for the rectangle.
* \return The query will return VISIBLE if the rectangle may be visible, OCCLUDED
* if the rectangle is occluded by a previously rendered object, or VIEW_CULLED
* if the rectangle is outside the view frustum.
*/
virtual CullingResult TestRect(float xmin, float ymin, float xmax, float ymax, float wmin) const = 0;
/*!
* \brief This function is similar to RenderTriangles(), but performs an occlusion
* query instead and does not update the hierarchical z buffer. The query uses
* a GREATER_EQUAL (reversed) depth test meaning that depth values equal to the
* contents of the depth buffer are counted as visible.
*
* This function is optimized for vertex layouts with stride 16 and y and w
* offsets of 4 and 12 bytes, respectively.
*
* \param inVtx Pointer to an array of input vertices, should point to the x component
* of the first vertex. The input vertices are given as (x,y,w) coordinates
* in clip space. The memory layout can be changed using vtxLayout.
* \param inTris Pointer to an array of triangle indices. Each triangle is created
* from three indices consecutively fetched from the array.
* \param nTris The number of triangles to render (inTris must contain atleast 3*nTris
* entries)
* \param modelToClipMatrix all vertices will be transformed by this matrix before
* performing projection. If nullptr is passed the transform step will be skipped
* \param bfWinding Sets triangle winding order to consider backfacing, must be one one
* of (BACKFACE_NONE, BACKFACE_CW and BACKFACE_CCW). Back-facing triangles are culled
* and will not be occlusion tested. You may use BACKFACE_NONE to disable culling
* for double sided geometry
* \param clipPlaneMask A mask indicating which clip planes should be considered by the
* triangle clipper. Can be used as an optimization if your application can
* determine (for example during culling) that a group of triangles does not
* intersect a certain frustum plane. However, setting an incorrect mask may
* cause out of bounds memory accesses.
* \param vtxLayout A struct specifying the vertex layout (see struct for detailed
* description). For best performance, it is advisable to store position data
* as compactly in memory as possible.
* \return The query will return VISIBLE if the triangle mesh may be visible, OCCLUDED
* if the mesh is occluded by a previously rendered object, or VIEW_CULLED if all
* triangles are entirely outside the view frustum or backface culled.
*/
virtual CullingResult TestTriangles(const float *inVtx, const unsigned int *inTris, int nTris, const float *modelToClipMatrix = nullptr, BackfaceWinding bfWinding = BACKFACE_CW, ClipPlanes clipPlaneMask = CLIP_PLANE_ALL, const VertexLayout &vtxLayout = VertexLayout(16, 4, 12)) = 0;
/*!
* \brief Perform input assembly, clipping , projection, triangle setup, and write
* triangles to the screen space bins they overlap. This function can be used to
* distribute work for threading (See the CullingThreadpool class for an example)
*
* \param inVtx Pointer to an array of input vertices, should point to the x component
* of the first vertex. The input vertices are given as (x,y,w) coordinates
* in clip space. The memory layout can be changed using vtxLayout.
* \param inTris Pointer to an array of vertex indices. Each triangle is created
* from three indices consecutively fetched from the array.
* \param nTris The number of triangles to render (inTris must contain atleast 3*nTris
* entries)
* \param triLists Pointer to an array of TriList objects with one TriList object per
* bin. If a triangle overlaps a bin, it will be written to the corresponding
* trilist. Note that this method appends the triangles to the current list, to
* start writing from the beginning of the list, set triList.mTriIdx = 0
* \param nBinsW Number of vertical bins, the screen is divided into nBinsW x nBinsH
* rectangular bins.
* \param nBinsH Number of horizontal bins, the screen is divided into nBinsW x nBinsH
* rectangular bins.
* \param modelToClipMatrix all vertices will be transformed by this matrix before
* performing projection. If nullptr is passed the transform step will be skipped
* \param clipPlaneMask A mask indicating which clip planes should be considered by the
* triangle clipper. Can be used as an optimization if your application can
* determine (for example during culling) that a group of triangles does not
* intersect a certain frustum plane. However, setting an incorrect mask may
* cause out of bounds memory accesses.
* \param vtxLayout A struct specifying the vertex layout (see struct for detailed
* description). For best performance, it is advisable to store position data
* as compactly in memory as possible.
* \param bfWinding Sets triangle winding order to consider backfacing, must be one one
* of (BACKFACE_NONE, BACKFACE_CW and BACKFACE_CCW). Back-facing triangles are culled
* and will not be binned / rasterized. You may use BACKFACE_NONE to disable culling
* for double sided geometry
*/
virtual void BinTriangles(const float *inVtx, const unsigned int *inTris, int nTris, TriList *triLists, unsigned int nBinsW, unsigned int nBinsH, const float *modelToClipMatrix = nullptr, BackfaceWinding bfWinding = BACKFACE_CW, ClipPlanes clipPlaneMask = CLIP_PLANE_ALL, const VertexLayout &vtxLayout = VertexLayout(16, 4, 12)) = 0;
/*!
* \brief Renders all occluder triangles in a trilist. This function can be used in
* combination with BinTriangles() to create a threded (binning) rasterizer. The
* bins can be processed independently by different threads without risking writing
* to overlapping memory regions.
*
* \param triLists A triangle list, filled using the BinTriangles() function that is to
* be rendered.
* \param scissor A scissor box limiting the rendering region to the bin. The size of each
* bin must be a multiple of 32x8 pixels due to implementation constraints. For a
* render target with (width, height) resolution and (nBinsW, nBinsH) bins, the
* size of a bin is:
* binWidth = (width / nBinsW) - (width / nBinsW) % 32;
* binHeight = (height / nBinsH) - (height / nBinsH) % 8;
* The last row and column of tiles have a different size:
* lastColBinWidth = width - (nBinsW-1)*binWidth;
* lastRowBinHeight = height - (nBinsH-1)*binHeight;
*/
virtual void RenderTrilist(const TriList &triList, const ScissorRect *scissor) = 0;
/*!
* \brief Creates a per-pixel depth buffer from the hierarchical z buffer representation.
* Intended for visualizing the hierarchical depth buffer for debugging. The
* buffer is written in scanline order, from the top to bottom (D3D) or bottom to
* top (OGL) of the surface. See the USE_D3D define.
*
* \param depthData Pointer to memory where the per-pixel depth data is written. Must
* hold storage for atleast width*height elements as set by setResolution.
*/
virtual void ComputePixelDepthBuffer(float *depthData, bool flipY) = 0;
/*!
* \brief Fetch occlusion culling statistics, returns zeroes if ENABLE_STATS define is
* not defined. The statistics can be used for profiling or debugging.
*/
virtual OcclusionCullingStatistics GetStatistics() = 0;
/*!
* \brief Returns the implementation (CPU instruction set) version of this object.
*/
virtual Implementation GetImplementation() = 0;
/*!
* \brief Utility function for transforming vertices and outputting them to an (x,y,z,w)
* format suitable for the occluder rasterization and occludee testing functions.
*
* \param mtx Pointer to matrix data. The matrix should column major for post
* multiplication (OGL) and row major for pre-multiplication (DX). This is
* consistent with OpenGL / DirectX behavior.
* \param inVtx Pointer to an array of input vertices. The input vertices are given as
* (x,y,z) coordinates. The memory layout can be changed using vtxLayout.
* \param xfVtx Pointer to an array to store transformed vertices. The transformed
* vertices are always stored as array of structs (AoS) (x,y,z,w) packed in memory.
* \param nVtx Number of vertices to transform.
* \param vtxLayout A struct specifying the vertex layout (see struct for detailed
* description). For best performance, it is advisable to store position data
* as compactly in memory as possible. Note that for this function, the
* w-component is assumed to be 1.0.
*/
static void TransformVertices(const float *mtx, const float *inVtx, float *xfVtx, unsigned int nVtx, const VertexLayout &vtxLayout = VertexLayout(12, 4, 8));
/*!
* \brief Get used memory alloc/free callbacks.
*/
void GetAllocFreeCallback( pfnAlignedAlloc & allocCallback, pfnAlignedFree & freeCallback ) { allocCallback = mAlignedAllocCallback, freeCallback = mAlignedFreeCallback; }
#if MOC_RECORDER_ENABLE
/*!
* \brief Start recording subsequent rasterization and testing calls using the FrameRecorder.
* The function calls that are recorded are:
* - ClearBuffer
* - RenderTriangles
* - TestTriangles
* - TestRect
* All inputs and outputs are recorded, which can be used for correctness validation
* and performance testing.
*
* \param outputFilePath Pointer to name of the output file.
* \return 'true' if recording was started successfully, 'false' otherwise (file access error).
*/
bool RecorderStart( const char * outputFilePath ) const;
/*!
* \brief Stop recording, flush output and release used memory.
*/
void RecorderStop( ) const;
/*!
* \brief Manually record triangles. This is called automatically from MaskedOcclusionCulling::RenderTriangles
* if the recording is started, but not from BinTriangles/RenderTrilist (used in multithreaded codepath), in
* which case it has to be called manually.
*
* \param inVtx Pointer to an array of input vertices, should point to the x component
* of the first vertex. The input vertices are given as (x,y,w) coordinates
* in clip space. The memory layout can be changed using vtxLayout.
* \param inTris Pointer to an array of triangle indices. Each triangle is created
* from three indices consecutively fetched from the array.
* \param nTris The number of triangles to render (inTris must contain atleast 3*nTris
* entries)
* \param modelToClipMatrix all vertices will be transformed by this matrix before
* performing projection. If nullptr is passed the transform step will be skipped
* \param bfWinding Sets triangle winding order to consider backfacing, must be one one
* of (BACKFACE_NONE, BACKFACE_CW and BACKFACE_CCW). Back-facing triangles are culled
* and will not be occlusion tested. You may use BACKFACE_NONE to disable culling
* for double sided geometry
* \param clipPlaneMask A mask indicating which clip planes should be considered by the
* triangle clipper. Can be used as an optimization if your application can
* determine (for example during culling) that a group of triangles does not
* intersect a certain frustum plane. However, setting an incorrect mask may
* cause out of bounds memory accesses.
* \param vtxLayout A struct specifying the vertex layout (see struct for detailed
* description). For best performance, it is advisable to store position data
* as compactly in memory as possible.
* \param cullingResult cull result value expected to be returned by executing the
* RenderTriangles call with recorded parameters.
*/
//
// merge the binned data back into original layout; in this case, call it manually from your Threadpool implementation (already added to CullingThreadpool).
// If recording is not enabled, calling this function will do nothing.
void RecordRenderTriangles( const float *inVtx, const unsigned int *inTris, int nTris, const float *modelToClipMatrix = nullptr, ClipPlanes clipPlaneMask = CLIP_PLANE_ALL, BackfaceWinding bfWinding = BACKFACE_CW, const VertexLayout &vtxLayout = VertexLayout( 16, 4, 12 ), CullingResult cullingResult = (CullingResult)-1 );
#endif // #if MOC_RECORDER_ENABLE
protected:
pfnAlignedAlloc mAlignedAllocCallback;
pfnAlignedFree mAlignedFreeCallback;
mutable OcclusionCullingStatistics mStats;
#if MOC_RECORDER_ENABLE
mutable FrameRecorder * mRecorder;
mutable std::mutex mRecorderMutex;
#endif // #if MOC_RECORDER_ENABLE
virtual ~MaskedOcclusionCulling() {}
};
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