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// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h
#include "CTerrainTriangleSelector.h"
#include "CTerrainSceneNode.h"
#include "os.h"
namespace irr
{
namespace scene
{
//! constructor
CTerrainTriangleSelector::CTerrainTriangleSelector ( ITerrainSceneNode* node, s32 LOD )
: SceneNode(node)
{
#ifdef _DEBUG
setDebugName ("CTerrainTriangleSelector");
#endif
setTriangleData(node, LOD);
}
//! destructor
CTerrainTriangleSelector::~CTerrainTriangleSelector()
{
TrianglePatches.TrianglePatchArray.clear();
}
//! Clears and sets triangle data
void CTerrainTriangleSelector::setTriangleData(ITerrainSceneNode* node, s32 LOD)
{
// Get pointer to the GeoMipMaps vertices
const video::S3DVertex2TCoords* vertices = static_cast<const video::S3DVertex2TCoords*>(node->getRenderBuffer()->getVertices());
// Clear current data
const s32 count = (static_cast<CTerrainSceneNode*>(node))->TerrainData.PatchCount;
TrianglePatches.TotalTriangles = 0;
TrianglePatches.NumPatches = count*count;
TrianglePatches.TrianglePatchArray.reallocate(TrianglePatches.NumPatches);
for (s32 o=0; o<TrianglePatches.NumPatches; ++o)
TrianglePatches.TrianglePatchArray.push_back(SGeoMipMapTrianglePatch());
core::triangle3df tri;
core::array<u32> indices;
s32 tIndex = 0;
for(s32 x = 0; x < count; ++x )
{
for(s32 z = 0; z < count; ++z )
{
TrianglePatches.TrianglePatchArray[tIndex].NumTriangles = 0;
TrianglePatches.TrianglePatchArray[tIndex].Box = node->getBoundingBox( x, z );
u32 indexCount = node->getIndicesForPatch( indices, x, z, LOD );
TrianglePatches.TrianglePatchArray[tIndex].Triangles.reallocate(indexCount/3);
for(u32 i = 0; i < indexCount; i += 3 )
{
tri.pointA = vertices[indices[i+0]].Pos;
tri.pointB = vertices[indices[i+1]].Pos;
tri.pointC = vertices[indices[i+2]].Pos;
TrianglePatches.TrianglePatchArray[tIndex].Triangles.push_back(tri);
++TrianglePatches.TrianglePatchArray[tIndex].NumTriangles;
}
TrianglePatches.TotalTriangles += TrianglePatches.TrianglePatchArray[tIndex].NumTriangles;
++tIndex;
}
}
}
//! Gets all triangles.
void CTerrainTriangleSelector::getTriangles(core::triangle3df* triangles,
s32 arraySize, s32& outTriangleCount,
const core::matrix4* transform) const
{
s32 count = TrianglePatches.TotalTriangles;
if (count > arraySize)
count = arraySize;
core::matrix4 mat;
if (transform)
mat = (*transform);
s32 tIndex = 0;
for (s32 i=0; i<TrianglePatches.NumPatches; ++i)
{
if (tIndex + TrianglePatches.TrianglePatchArray[i].NumTriangles <= count)
for (s32 j=0; j<TrianglePatches.TrianglePatchArray[i].NumTriangles; ++j)
{
triangles[tIndex] = TrianglePatches.TrianglePatchArray[i].Triangles[j];
mat.transformVect(triangles[tIndex].pointA);
mat.transformVect(triangles[tIndex].pointB);
mat.transformVect(triangles[tIndex].pointC);
++tIndex;
}
}
outTriangleCount = tIndex;
}
//! Gets all triangles which lie within a specific bounding box.
void CTerrainTriangleSelector::getTriangles(core::triangle3df* triangles,
s32 arraySize, s32& outTriangleCount,
const core::aabbox3d<f32>& box, const core::matrix4* transform) const
{
s32 count = TrianglePatches.TotalTriangles;
if (count > arraySize)
count = arraySize;
core::matrix4 mat;
if (transform)
mat = (*transform);
s32 tIndex = 0;
for (s32 i=0; i<TrianglePatches.NumPatches; ++i)
{
if (tIndex + TrianglePatches.TrianglePatchArray[i].NumTriangles <= count &&
TrianglePatches.TrianglePatchArray[i].Box.intersectsWithBox(box))
for (s32 j=0; j<TrianglePatches.TrianglePatchArray[i].NumTriangles; ++j)
{
triangles[tIndex] = TrianglePatches.TrianglePatchArray[i].Triangles[j];
mat.transformVect(triangles[tIndex].pointA);
mat.transformVect(triangles[tIndex].pointB);
mat.transformVect(triangles[tIndex].pointC);
++tIndex;
}
}
outTriangleCount = tIndex;
}
//! Gets all triangles which have or may have contact with a 3d line.
void CTerrainTriangleSelector::getTriangles(core::triangle3df* triangles,
s32 arraySize, s32& outTriangleCount, const core::line3d<f32>& line,
const core::matrix4* transform) const
{
const s32 count = core::min_((s32)TrianglePatches.TotalTriangles, arraySize);
core::matrix4 mat;
if (transform)
mat = (*transform);
s32 tIndex = 0;
for (s32 i=0; i<TrianglePatches.NumPatches; ++i)
{
if (tIndex + TrianglePatches.TrianglePatchArray[i].NumTriangles <= count
&& TrianglePatches.TrianglePatchArray[i].Box.intersectsWithLine(line))
{
for (s32 j=0; j<TrianglePatches.TrianglePatchArray[i].NumTriangles; ++j)
{
triangles[tIndex] = TrianglePatches.TrianglePatchArray[i].Triangles[j];
mat.transformVect(triangles[tIndex].pointA);
mat.transformVect(triangles[tIndex].pointB);
mat.transformVect(triangles[tIndex].pointC);
++tIndex;
}
}
}
outTriangleCount = tIndex;
}
//! Returns amount of all available triangles in this selector
s32 CTerrainTriangleSelector::getTriangleCount() const
{
return TrianglePatches.TotalTriangles;
}
ISceneNode* CTerrainTriangleSelector::getSceneNodeForTriangle(
u32 triangleIndex) const
{
return SceneNode;
}
/* Get the number of TriangleSelectors that are part of this one.
Only useful for MetaTriangleSelector others return 1
*/
u32 CTerrainTriangleSelector::getSelectorCount() const
{
return 1;
}
/* Get the TriangleSelector based on index based on getSelectorCount.
Only useful for MetaTriangleSelector others return 'this' or 0
*/
ITriangleSelector* CTerrainTriangleSelector::getSelector(u32 index)
{
if (index)
return 0;
else
return this;
}
/* Get the TriangleSelector based on index based on getSelectorCount.
Only useful for MetaTriangleSelector others return 'this' or 0
*/
const ITriangleSelector* CTerrainTriangleSelector::getSelector(u32 index) const
{
if (index)
return 0;
else
return this;
}
} // end namespace scene
} // end namespace irr
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