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// Copyright 2009-2020 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#include "scene_grid_mesh.h"
#include "scene.h"
namespace embree
{
#if defined(EMBREE_LOWEST_ISA)
GridMesh::GridMesh (Device* device)
: Geometry(device,GTY_GRID_MESH,0,1)
{
vertices.resize(numTimeSteps);
}
void GridMesh::setMask (unsigned mask)
{
this->mask = mask;
Geometry::update();
}
void GridMesh::setNumTimeSteps (unsigned int numTimeSteps)
{
vertices.resize(numTimeSteps);
Geometry::setNumTimeSteps(numTimeSteps);
}
void GridMesh::setVertexAttributeCount (unsigned int N)
{
vertexAttribs.resize(N);
Geometry::update();
}
void GridMesh::setBuffer(RTCBufferType type, unsigned int slot, RTCFormat format, const Ref<Buffer>& buffer, size_t offset, size_t stride, unsigned int num)
{
/* verify that all accesses are 4 bytes aligned */
if (((size_t(buffer->getPtr()) + offset) & 0x3) || (stride & 0x3))
throw_RTCError(RTC_ERROR_INVALID_OPERATION, "data must be 4 bytes aligned");
if (type == RTC_BUFFER_TYPE_VERTEX)
{
if (format != RTC_FORMAT_FLOAT3)
throw_RTCError(RTC_ERROR_INVALID_OPERATION, "invalid vertex buffer format");
/* if buffer is larger than 16GB the premultiplied index optimization does not work */
if (stride*num > 16ll*1024ll*1024ll*1024ll)
throw_RTCError(RTC_ERROR_INVALID_OPERATION, "vertex buffer can be at most 16GB large");
if (slot >= vertices.size())
throw_RTCError(RTC_ERROR_INVALID_ARGUMENT, "invalid vertex buffer slot");
vertices[slot].set(buffer, offset, stride, num, format);
vertices[slot].checkPadding16();
vertices0 = vertices[0];
}
else if (type == RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE)
{
if (format < RTC_FORMAT_FLOAT || format > RTC_FORMAT_FLOAT16)
throw_RTCError(RTC_ERROR_INVALID_OPERATION, "invalid vertex attribute buffer format");
if (slot >= vertexAttribs.size())
throw_RTCError(RTC_ERROR_INVALID_OPERATION, "invalid vertex attribute buffer slot");
vertexAttribs[slot].set(buffer, offset, stride, num, format);
vertexAttribs[slot].checkPadding16();
}
else if (type == RTC_BUFFER_TYPE_GRID)
{
if (slot != 0)
throw_RTCError(RTC_ERROR_INVALID_ARGUMENT, "invalid buffer slot");
if (format != RTC_FORMAT_GRID)
throw_RTCError(RTC_ERROR_INVALID_OPERATION, "invalid index buffer format");
grids.set(buffer, offset, stride, num, format);
setNumPrimitives(num);
}
else
throw_RTCError(RTC_ERROR_INVALID_ARGUMENT, "unknown buffer type");
}
void* GridMesh::getBuffer(RTCBufferType type, unsigned int slot)
{
if (type == RTC_BUFFER_TYPE_GRID)
{
if (slot != 0)
throw_RTCError(RTC_ERROR_INVALID_ARGUMENT, "invalid buffer slot");
return grids.getPtr();
}
else if (type == RTC_BUFFER_TYPE_VERTEX)
{
if (slot >= vertices.size())
throw_RTCError(RTC_ERROR_INVALID_ARGUMENT, "invalid buffer slot");
return vertices[slot].getPtr();
}
else if (type == RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE)
{
if (slot >= vertexAttribs.size())
throw_RTCError(RTC_ERROR_INVALID_ARGUMENT, "invalid buffer slot");
return vertexAttribs[slot].getPtr();
}
else
{
throw_RTCError(RTC_ERROR_INVALID_ARGUMENT, "unknown buffer type");
return nullptr;
}
}
void GridMesh::updateBuffer(RTCBufferType type, unsigned int slot)
{
if (type == RTC_BUFFER_TYPE_GRID)
{
if (slot != 0)
throw_RTCError(RTC_ERROR_INVALID_ARGUMENT, "invalid buffer slot");
grids.setModified();
}
else if (type == RTC_BUFFER_TYPE_VERTEX)
{
if (slot >= vertices.size())
throw_RTCError(RTC_ERROR_INVALID_ARGUMENT, "invalid buffer slot");
vertices[slot].setModified();
}
else if (type == RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE)
{
if (slot >= vertexAttribs.size())
throw_RTCError(RTC_ERROR_INVALID_ARGUMENT, "invalid buffer slot");
vertexAttribs[slot].setModified();
}
else
{
throw_RTCError(RTC_ERROR_INVALID_ARGUMENT, "unknown buffer type");
}
Geometry::update();
}
void GridMesh::commit()
{
/* verify that stride of all time steps are identical */
for (unsigned int t=0; t<numTimeSteps; t++)
if (vertices[t].getStride() != vertices[0].getStride())
throw_RTCError(RTC_ERROR_INVALID_OPERATION,"stride of vertex buffers have to be identical for each time step");
Geometry::commit();
}
void GridMesh::addElementsToCount (GeometryCounts & counts) const
{
if (numTimeSteps == 1) counts.numGrids += numPrimitives;
else counts.numMBGrids += numPrimitives;
}
bool GridMesh::verify()
{
/*! verify size of vertex arrays */
if (vertices.size() == 0) return false;
for (const auto& buffer : vertices)
if (buffer.size() != numVertices())
return false;
/*! verify size of user vertex arrays */
for (const auto& buffer : vertexAttribs)
if (buffer.size() != numVertices())
return false;
/*! verify vertices */
for (const auto& buffer : vertices)
for (size_t i=0; i<buffer.size(); i++)
if (!isvalid(buffer[i]))
return false;
return true;
}
void GridMesh::interpolate(const RTCInterpolateArguments* const args)
{
unsigned int primID = args->primID;
float U = args->u;
float V = args->v;
/* clamp input u,v to [0;1] range */
U = max(min(U,1.0f),0.0f);
V = max(min(V,1.0f),0.0f);
RTCBufferType bufferType = args->bufferType;
unsigned int bufferSlot = args->bufferSlot;
float* P = args->P;
float* dPdu = args->dPdu;
float* dPdv = args->dPdv;
float* ddPdudu = args->ddPdudu;
float* ddPdvdv = args->ddPdvdv;
float* ddPdudv = args->ddPdudv;
unsigned int valueCount = args->valueCount;
/* calculate base pointer and stride */
assert((bufferType == RTC_BUFFER_TYPE_VERTEX && bufferSlot < numTimeSteps) ||
(bufferType == RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE && bufferSlot <= vertexAttribs.size()));
const char* src = nullptr;
size_t stride = 0;
if (bufferType == RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE) {
src = vertexAttribs[bufferSlot].getPtr();
stride = vertexAttribs[bufferSlot].getStride();
} else {
src = vertices[bufferSlot].getPtr();
stride = vertices[bufferSlot].getStride();
}
const Grid& grid = grids[primID];
const int grid_width = grid.resX-1;
const int grid_height = grid.resY-1;
const float rcp_grid_width = rcp(float(grid_width));
const float rcp_grid_height = rcp(float(grid_height));
const int iu = min((int)floor(U*grid_width ),grid_width);
const int iv = min((int)floor(V*grid_height),grid_height);
const float u = U*grid_width-float(iu);
const float v = V*grid_height-float(iv);
for (unsigned int i=0; i<valueCount; i+=4)
{
const size_t ofs = i*sizeof(float);
const unsigned int idx0 = grid.startVtxID + (iv+0)*grid.lineVtxOffset + iu;
const unsigned int idx1 = grid.startVtxID + (iv+1)*grid.lineVtxOffset + iu;
const vbool4 valid = vint4((int)i)+vint4(step) < vint4(int(valueCount));
const vfloat4 p0 = vfloat4::loadu(valid,(float*)&src[(idx0+0)*stride+ofs]);
const vfloat4 p1 = vfloat4::loadu(valid,(float*)&src[(idx0+1)*stride+ofs]);
const vfloat4 p2 = vfloat4::loadu(valid,(float*)&src[(idx1+1)*stride+ofs]);
const vfloat4 p3 = vfloat4::loadu(valid,(float*)&src[(idx1+0)*stride+ofs]);
const vbool4 left = u+v <= 1.0f;
const vfloat4 Q0 = select(left,p0,p2);
const vfloat4 Q1 = select(left,p1,p3);
const vfloat4 Q2 = select(left,p3,p1);
const vfloat4 U = select(left,u,vfloat4(1.0f)-u);
const vfloat4 V = select(left,v,vfloat4(1.0f)-v);
const vfloat4 W = 1.0f-U-V;
if (P) {
vfloat4::storeu(valid,P+i,madd(W,Q0,madd(U,Q1,V*Q2)));
}
if (dPdu) {
assert(dPdu); vfloat4::storeu(valid,dPdu+i,select(left,Q1-Q0,Q0-Q1)*rcp_grid_width);
assert(dPdv); vfloat4::storeu(valid,dPdv+i,select(left,Q2-Q0,Q0-Q2)*rcp_grid_height);
}
if (ddPdudu) {
assert(ddPdudu); vfloat4::storeu(valid,ddPdudu+i,vfloat4(zero));
assert(ddPdvdv); vfloat4::storeu(valid,ddPdvdv+i,vfloat4(zero));
assert(ddPdudv); vfloat4::storeu(valid,ddPdudv+i,vfloat4(zero));
}
}
}
#endif
namespace isa
{
GridMesh* createGridMesh(Device* device) {
return new GridMeshISA(device);
}
}
}
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