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vtkOpenGLPolyDataMapper.cxx
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vtkOpenGLPolyDataMapper.cxx
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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkOpenGLPolyDataMapper.h"
#include "vtkCamera.h"
#include "vtkCellArray.h"
#include "vtkCellData.h"
#include "vtkCommand.h"
#include "vtkFloatArray.h"
#include "vtkHardwareSelector.h"
#include "vtkIdTypeArray.h"
#include "vtkImageData.h"
#include "vtkInformation.h"
#include "vtkLight.h"
#include "vtkLightCollection.h"
#include "vtkLightingMapPass.h"
#include "vtkMath.h"
#include "vtkMatrix3x3.h"
#include "vtkMatrix4x4.h"
#include "vtkLookupTable.h"
#include "vtkObjectFactory.h"
#include "vtkOpenGLActor.h"
#include "vtkOpenGLBufferObject.h"
#include "vtkOpenGLCamera.h"
#include "vtkOpenGLCellToVTKCellMap.h"
#include "vtkOpenGLError.h"
#include "vtkOpenGLHelper.h"
#include "vtkOpenGLIndexBufferObject.h"
#include "vtkOpenGLRenderPass.h"
#include "vtkOpenGLRenderTimer.h"
#include "vtkOpenGLRenderWindow.h"
#include "vtkOpenGLRenderer.h"
#include "vtkOpenGLResourceFreeCallback.h"
#include "vtkOpenGLShaderCache.h"
#include "vtkOpenGLShaderProperty.h"
#include "vtkOpenGLState.h"
#include "vtkOpenGLTexture.h"
#include "vtkOpenGLUniforms.h"
#include "vtkOpenGLVertexArrayObject.h"
#include "vtkOpenGLVertexBufferObject.h"
#include "vtkOpenGLVertexBufferObjectCache.h"
#include "vtkOpenGLVertexBufferObjectGroup.h"
#include "vtkPBRIrradianceTexture.h"
#include "vtkPBRLUTTexture.h"
#include "vtkPBRPrefilterTexture.h"
#include "vtkPointData.h"
#include "vtkPolyData.h"
#include "vtkProperty.h"
#include "vtkScalarsToColors.h"
#include "vtkSelection.h"
#include "vtkSelectionNode.h"
#include "vtkShaderProgram.h"
#include "vtkTextureObject.h"
#include "vtkTransform.h"
#include "vtkUnsignedCharArray.h"
#include "vtkUnsignedIntArray.h"
#include "vtkPBRFunctions.h"
// Bring in our fragment lit shader symbols.
#include "vtkPolyDataEdgesGS.h"
#include "vtkPolyDataFS.h"
#include "vtkPolyDataVS.h"
#include "vtkPolyDataWideLineGS.h"
#include <algorithm>
#include <sstream>
//------------------------------------------------------------------------------
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkOpenGLPolyDataMapper);
//------------------------------------------------------------------------------
vtkOpenGLPolyDataMapper::vtkOpenGLPolyDataMapper()
: UsingScalarColoring(false)
, TimerQuery(new vtkOpenGLRenderTimer)
{
this->InternalColorTexture = nullptr;
this->PopulateSelectionSettings = 1;
this->PointPicking = false;
this->LastSelectionState = vtkHardwareSelector::MIN_KNOWN_PASS - 1;
this->CurrentInput = nullptr;
this->TempMatrix4 = vtkMatrix4x4::New();
this->TempMatrix3 = vtkMatrix3x3::New();
this->DrawingVertices = false;
this->ForceTextureCoordinates = false;
this->SelectionType = VTK_POINTS;
this->UseProgramPointSize = false;
this->PrimitiveIDOffset = 0;
this->CellScalarTexture = nullptr;
this->CellScalarBuffer = nullptr;
this->CellNormalTexture = nullptr;
this->CellNormalBuffer = nullptr;
this->EdgeTexture = nullptr;
this->EdgeBuffer = nullptr;
this->HaveCellScalars = false;
this->HaveCellNormals = false;
this->PointIdArrayName = nullptr;
this->CellIdArrayName = nullptr;
this->ProcessIdArrayName = nullptr;
this->CompositeIdArrayName = nullptr;
this->VBOs = vtkOpenGLVertexBufferObjectGroup::New();
this->LastBoundBO = nullptr;
for (int i = vtkOpenGLPolyDataMapper::PrimitiveStart; i < vtkOpenGLPolyDataMapper::PrimitiveEnd;
i++)
{
auto& primInfo = this->PrimitiveInfo[&this->Primitives[i]];
primInfo.LastLightComplexity = -1;
primInfo.LastLightCount = 0;
this->Primitives[i].PrimitiveType = i;
this->SelectionPrimitives[i].PrimitiveType = i;
}
this->ResourceCallback = new vtkOpenGLResourceFreeCallback<vtkOpenGLPolyDataMapper>(
this, &vtkOpenGLPolyDataMapper::ReleaseGraphicsResources);
// initialize to 1 as 0 indicates we have initiated a request
this->TimerQueryCounter = 1;
this->TimeToDraw = 0.0001;
}
//------------------------------------------------------------------------------
vtkOpenGLPolyDataMapper::~vtkOpenGLPolyDataMapper()
{
if (this->ResourceCallback)
{
this->ResourceCallback->Release();
delete this->ResourceCallback;
this->ResourceCallback = nullptr;
}
if (this->InternalColorTexture)
{ // Resources released previously.
this->InternalColorTexture->Delete();
this->InternalColorTexture = nullptr;
}
this->TempMatrix3->Delete();
this->TempMatrix4->Delete();
if (this->CellScalarTexture)
{ // Resources released previously.
this->CellScalarTexture->Delete();
this->CellScalarTexture = nullptr;
}
if (this->CellScalarBuffer)
{ // Resources released previously.
this->CellScalarBuffer->Delete();
this->CellScalarBuffer = nullptr;
}
if (this->EdgeTexture)
{ // Resources released previously.
this->EdgeTexture->Delete();
this->EdgeTexture = nullptr;
}
if (this->EdgeBuffer)
{ // Resources released previously.
this->EdgeBuffer->Delete();
this->EdgeBuffer = nullptr;
}
if (this->CellNormalTexture)
{ // Resources released previously.
this->CellNormalTexture->Delete();
this->CellNormalTexture = nullptr;
}
if (this->CellNormalBuffer)
{ // Resources released previously.
this->CellNormalBuffer->Delete();
this->CellNormalBuffer = nullptr;
}
this->SetPointIdArrayName(nullptr);
this->SetCellIdArrayName(nullptr);
this->SetProcessIdArrayName(nullptr);
this->SetCompositeIdArrayName(nullptr);
this->VBOs->Delete();
this->VBOs = nullptr;
delete TimerQuery;
}
//------------------------------------------------------------------------------
void vtkOpenGLPolyDataMapper::ReleaseGraphicsResources(vtkWindow* win)
{
if (!this->ResourceCallback->IsReleasing())
{
this->ResourceCallback->Release();
return;
}
this->VBOs->ReleaseGraphicsResources(win);
for (int i = vtkOpenGLPolyDataMapper::PrimitiveStart; i < vtkOpenGLPolyDataMapper::PrimitiveEnd;
i++)
{
this->Primitives[i].ReleaseGraphicsResources(win);
this->SelectionPrimitives[i].ReleaseGraphicsResources(win);
}
if (this->InternalColorTexture)
{
this->InternalColorTexture->ReleaseGraphicsResources(win);
}
if (this->CellScalarTexture)
{
this->CellScalarTexture->ReleaseGraphicsResources(win);
}
if (this->CellScalarBuffer)
{
this->CellScalarBuffer->ReleaseGraphicsResources();
}
if (this->CellNormalTexture)
{
this->CellNormalTexture->ReleaseGraphicsResources(win);
}
if (this->CellNormalBuffer)
{
this->CellNormalBuffer->ReleaseGraphicsResources();
}
if (this->EdgeTexture)
{
this->EdgeTexture->ReleaseGraphicsResources(win);
}
if (this->EdgeBuffer)
{
this->EdgeBuffer->ReleaseGraphicsResources();
}
this->TimerQuery->ReleaseGraphicsResources();
this->VBOBuildState.Clear();
this->IBOBuildState.Clear();
this->CellTextureBuildState.Clear();
this->Modified();
}
//------------------------------------------------------------------------------
vtkPolyDataMapper::MapperHashType vtkOpenGLPolyDataMapper::GenerateHash(vtkPolyData* polydata)
{
int cellFlag = 0;
vtkAbstractArray* scalars = this->GetAbstractScalars(
polydata, this->ScalarMode, this->ArrayAccessMode, this->ArrayId, this->ArrayName, cellFlag);
bool hasScalars = this->ScalarVisibility && (scalars != nullptr);
bool hasPointScalars = hasScalars && !cellFlag;
// Field data scalar mode treats field data like cell data
bool hasCellScalars = hasScalars && (cellFlag == 1 || cellFlag == 2);
bool usesPointNormals = polydata->GetPointData()->GetNormals() != nullptr;
bool usesPointTexCoords = polydata->GetPointData()->GetTCoords() != nullptr;
bool usesPointColorsWithTextureMaps =
this->CanUseTextureMapForColoring(polydata) && hasPointScalars;
bool usesPointColors = !usesPointColorsWithTextureMaps && hasPointScalars;
bool usesCellColorTexture = !usesPointColorsWithTextureMaps && !usesPointColors && hasCellScalars;
bool usesCellNormalTexture =
!usesPointNormals && (polydata->GetCellData()->GetNormals() != nullptr);
// The hash is seeded from the address of the lookup table.
// WARNING: Technically, hash will overflow when
// &(lut) >= max_n_bit_ptr_address - 126, where n == 32 or n == 64
MapperHashType hash = 0;
// Get the lookup table.
vtkDataArray* dataArray = vtkArrayDownCast<vtkDataArray>(scalars);
vtkScalarsToColors* lut = nullptr;
if (dataArray && dataArray->GetLookupTable())
{
lut = vtkScalarsToColors::SafeDownCast(dataArray->GetLookupTable());
}
else
{
lut = this->LookupTable;
}
hash = std::hash<MapperHashType>{}(reinterpret_cast<std::uintptr_t>(lut));
hash += (usesPointColors << 1);
hash += (usesPointNormals << 2);
hash += (usesPointTexCoords << 3);
hash += (usesPointColorsWithTextureMaps << 4);
hash += (usesCellColorTexture << 5);
hash += (usesCellNormalTexture << 6);
return hash;
}
//------------------------------------------------------------------------------
void vtkOpenGLPolyDataMapper::BuildShaders(
std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* actor)
{
this->GetShaderTemplate(shaders, ren, actor);
// user specified pre replacements
vtkOpenGLShaderProperty* sp = vtkOpenGLShaderProperty::SafeDownCast(actor->GetShaderProperty());
vtkOpenGLShaderProperty::ReplacementMap repMap = sp->GetAllShaderReplacements();
for (const auto& i : repMap)
{
if (i.first.ReplaceFirst)
{
std::string ssrc = shaders[i.first.ShaderType]->GetSource();
vtkShaderProgram::Substitute(
ssrc, i.first.OriginalValue, i.second.Replacement, i.second.ReplaceAll);
shaders[i.first.ShaderType]->SetSource(ssrc);
}
}
this->ReplaceShaderValues(shaders, ren, actor);
// user specified post replacements
for (const auto& i : repMap)
{
if (!i.first.ReplaceFirst)
{
std::string ssrc = shaders[i.first.ShaderType]->GetSource();
vtkShaderProgram::Substitute(
ssrc, i.first.OriginalValue, i.second.Replacement, i.second.ReplaceAll);
shaders[i.first.ShaderType]->SetSource(ssrc);
}
}
}
//------------------------------------------------------------------------------
bool vtkOpenGLPolyDataMapper::HaveWideLines(vtkRenderer* ren, vtkActor* actor)
{
vtkHardwareSelector* selector = ren->GetSelector();
if (selector && selector->GetFieldAssociation() == vtkDataObject::FIELD_ASSOCIATION_POINTS)
{
return false;
}
if (this->GetOpenGLMode(
actor->GetProperty()->GetRepresentation(), this->LastBoundBO->PrimitiveType) == GL_LINES &&
actor->GetProperty()->GetLineWidth() > 1.0)
{
// we have wide lines, but the OpenGL implementation may
// actually support them, check the range to see if we
// really need have to implement our own wide lines
vtkOpenGLRenderWindow* renWin = vtkOpenGLRenderWindow::SafeDownCast(ren->GetRenderWindow());
return actor->GetProperty()->GetRenderLinesAsTubes() ||
!(renWin && renWin->GetMaximumHardwareLineWidth() >= actor->GetProperty()->GetLineWidth());
}
return this->DrawingSelection &&
(this->GetOpenGLMode(this->SelectionType, this->LastBoundBO->PrimitiveType) == GL_LINES);
}
//------------------------------------------------------------------------------
bool vtkOpenGLPolyDataMapper::DrawingEdges(vtkRenderer*, vtkActor* actor)
{
if (this->PointPicking)
{
return false;
}
if (actor->GetProperty()->GetEdgeVisibility() &&
this->GetOpenGLMode(
actor->GetProperty()->GetRepresentation(), this->LastBoundBO->PrimitiveType) == GL_TRIANGLES)
{
return true;
}
return false;
}
//-----------------------------------------------------------------------------
vtkMTimeType vtkOpenGLPolyDataMapper::GetRenderPassStageMTime(
vtkActor* actor, const vtkOpenGLHelper* cellBO)
{
vtkInformation* info = actor->GetPropertyKeys();
vtkMTimeType renderPassMTime = 0;
int curRenderPasses = 0;
if (info && info->Has(vtkOpenGLRenderPass::RenderPasses()))
{
curRenderPasses = info->Length(vtkOpenGLRenderPass::RenderPasses());
}
vtkInformation* lastRenderPassInfo = this->PrimitiveInfo[cellBO].LastRenderPassInfo;
int lastRenderPasses = 0;
if (lastRenderPassInfo->Has(vtkOpenGLRenderPass::RenderPasses()))
{
lastRenderPasses = lastRenderPassInfo->Length(vtkOpenGLRenderPass::RenderPasses());
}
else // have no last pass
{
if (!info) // have no current pass
{
return 0; // short circuit
}
}
// Determine the last time a render pass changed stages:
if (curRenderPasses != lastRenderPasses)
{
// Number of passes changed, definitely need to update.
// Fake the time to force an update:
renderPassMTime = VTK_MTIME_MAX;
}
else
{
// Compare the current to the previous render passes:
for (int i = 0; i < curRenderPasses; ++i)
{
vtkObjectBase* curRP = info->Get(vtkOpenGLRenderPass::RenderPasses(), i);
vtkObjectBase* lastRP = lastRenderPassInfo->Get(vtkOpenGLRenderPass::RenderPasses(), i);
if (curRP != lastRP)
{
// Render passes have changed. Force update:
renderPassMTime = VTK_MTIME_MAX;
break;
}
else
{
// Render passes have not changed -- check MTime.
vtkOpenGLRenderPass* rp = static_cast<vtkOpenGLRenderPass*>(curRP);
renderPassMTime = std::max(renderPassMTime, rp->GetShaderStageMTime());
}
}
}
// Cache the current set of render passes for next time:
if (info)
{
lastRenderPassInfo->CopyEntry(info, vtkOpenGLRenderPass::RenderPasses());
}
else
{
lastRenderPassInfo->Clear();
}
return renderPassMTime;
}
//------------------------------------------------------------------------------
std::string vtkOpenGLPolyDataMapper::GetTextureCoordinateName(const char* tname)
{
for (const auto& it : this->ExtraAttributes)
{
if (it.second.TextureName == tname)
{
return it.first;
}
}
// Return the attribute name of the specific tcoords used for scalar coloring with texture
if (tname == std::string("colortexture"))
{
return "colorTCoord";
}
return std::string("tcoord");
}
//------------------------------------------------------------------------------
bool vtkOpenGLPolyDataMapper::HaveTextures(vtkActor* actor)
{
return (this->GetNumberOfTextures(actor) > 0);
}
typedef std::pair<vtkTexture*, std::string> texinfo;
//------------------------------------------------------------------------------
unsigned int vtkOpenGLPolyDataMapper::GetNumberOfTextures(vtkActor* actor)
{
unsigned int res = 0;
if (this->ColorTextureMap)
{
res++;
}
if (actor->GetTexture())
{
res++;
}
res += actor->GetProperty()->GetNumberOfTextures();
return res;
}
//------------------------------------------------------------------------------
std::vector<texinfo> vtkOpenGLPolyDataMapper::GetTextures(vtkActor* actor)
{
std::vector<texinfo> res;
if (this->ColorTextureMap)
{
res.emplace_back(this->InternalColorTexture, "colortexture");
}
if (actor->GetTexture())
{
res.emplace_back(actor->GetTexture(), "actortexture");
}
auto textures = actor->GetProperty()->GetAllTextures();
for (const auto& ti : textures)
{
res.emplace_back(ti.second, ti.first);
}
return res;
}
//------------------------------------------------------------------------------
bool vtkOpenGLPolyDataMapper::HaveTCoords(vtkPolyData* poly)
{
return (poly->GetPointData()->GetTCoords() || this->ForceTextureCoordinates);
}
//------------------------------------------------------------------------------
void vtkOpenGLPolyDataMapper::GetShaderTemplate(
std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* actor)
{
vtkShaderProperty* sp = actor->GetShaderProperty();
if (sp->HasVertexShaderCode())
{
shaders[vtkShader::Vertex]->SetSource(sp->GetVertexShaderCode());
}
else
{
shaders[vtkShader::Vertex]->SetSource(vtkPolyDataVS);
}
if (sp->HasFragmentShaderCode())
{
shaders[vtkShader::Fragment]->SetSource(sp->GetFragmentShaderCode());
}
else
{
shaders[vtkShader::Fragment]->SetSource(vtkPolyDataFS);
}
if (sp->HasGeometryShaderCode())
{
shaders[vtkShader::Geometry]->SetSource(sp->GetGeometryShaderCode());
}
else
{
if (this->DrawingEdges(ren, actor) && !this->DrawingSelection)
{
shaders[vtkShader::Geometry]->SetSource(vtkPolyDataEdgesGS);
}
else if (this->HaveWideLines(ren, actor))
{
shaders[vtkShader::Geometry]->SetSource(vtkPolyDataWideLineGS);
}
else
{
shaders[vtkShader::Geometry]->SetSource("");
}
}
}
//------------------------------------------------------------------------------
void vtkOpenGLPolyDataMapper::ReplaceShaderRenderPass(
std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer*, vtkActor* act, bool prePass)
{
std::string VSSource = shaders[vtkShader::Vertex]->GetSource();
std::string GSSource = shaders[vtkShader::Geometry]->GetSource();
std::string FSSource = shaders[vtkShader::Fragment]->GetSource();
vtkInformation* info = act->GetPropertyKeys();
if (info && info->Has(vtkOpenGLRenderPass::RenderPasses()))
{
int numRenderPasses = info->Length(vtkOpenGLRenderPass::RenderPasses());
for (int i = 0; i < numRenderPasses; ++i)
{
vtkObjectBase* rpBase = info->Get(vtkOpenGLRenderPass::RenderPasses(), i);
vtkOpenGLRenderPass* rp = static_cast<vtkOpenGLRenderPass*>(rpBase);
if (prePass)
{
if (!rp->PreReplaceShaderValues(VSSource, GSSource, FSSource, this, act))
{
vtkErrorMacro(
"vtkOpenGLRenderPass::ReplaceShaderValues failed for " << rp->GetClassName());
}
}
else
{
if (!rp->PostReplaceShaderValues(VSSource, GSSource, FSSource, this, act))
{
vtkErrorMacro(
"vtkOpenGLRenderPass::ReplaceShaderValues failed for " << rp->GetClassName());
}
}
}
}
shaders[vtkShader::Vertex]->SetSource(VSSource);
shaders[vtkShader::Geometry]->SetSource(GSSource);
shaders[vtkShader::Fragment]->SetSource(FSSource);
}
//------------------------------------------------------------------------------
void vtkOpenGLPolyDataMapper::ReplaceShaderCustomUniforms(
std::map<vtkShader::Type, vtkShader*> shaders, vtkActor* actor)
{
vtkShaderProperty* sp = actor->GetShaderProperty();
vtkShader* vertexShader = shaders[vtkShader::Vertex];
vtkOpenGLUniforms* vu = static_cast<vtkOpenGLUniforms*>(sp->GetVertexCustomUniforms());
vtkShaderProgram::Substitute(vertexShader, "//VTK::CustomUniforms::Dec", vu->GetDeclarations());
vtkShader* fragmentShader = shaders[vtkShader::Fragment];
vtkOpenGLUniforms* fu = static_cast<vtkOpenGLUniforms*>(sp->GetFragmentCustomUniforms());
vtkShaderProgram::Substitute(fragmentShader, "//VTK::CustomUniforms::Dec", fu->GetDeclarations());
vtkShader* geometryShader = shaders[vtkShader::Geometry];
vtkOpenGLUniforms* gu = static_cast<vtkOpenGLUniforms*>(sp->GetGeometryCustomUniforms());
vtkShaderProgram::Substitute(geometryShader, "//VTK::CustomUniforms::Dec", gu->GetDeclarations());
}
//------------------------------------------------------------------------------
void vtkOpenGLPolyDataMapper::ReplaceShaderEdges(
std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* actor)
{
if (this->DrawingEdges(ren, actor))
{
if (this->LastBoundBO->PrimitiveType == PrimitiveTris)
{
std::string GSSource = shaders[vtkShader::Geometry]->GetSource();
if (!this->EdgeValues.empty())
{
vtkShaderProgram::Substitute(
GSSource, "//VTK::Edges::Dec", "uniform samplerBuffer edgeTexture;");
vtkShaderProgram::Substitute(GSSource, "//VTK::Edges::Impl",
"float edgeValues = 255.0*texelFetch(edgeTexture, gl_PrimitiveIDIn + "
"PrimitiveIDOffset).r;\n"
"if (edgeValues < 4.0) edgeEqn[2].z = lineWidth;\n"
"if (mod(edgeValues, 4.0) < 2.0) edgeEqn[1].z = lineWidth;\n"
"if (mod(edgeValues, 2.0) < 1.0) edgeEqn[0].z = lineWidth;\n");
}
shaders[vtkShader::Geometry]->SetSource(GSSource);
}
// discard pixels that are outside the polygon and not an edge
std::string FSSource = shaders[vtkShader::Fragment]->GetSource();
vtkShaderProgram::Substitute(FSSource, "//VTK::Edges::Dec",
"noperspective in vec4 edgeEqn[3];\n"
"uniform float lineWidth;\n"
"uniform vec3 edgeColor;\n"
"uniform float edgeOpacity;\n");
std::string fsimpl =
// distance gets larger as you go inside the polygon
"float edist[3];\n"
"edist[0] = dot(edgeEqn[0].xy, gl_FragCoord.xy) + edgeEqn[0].w;\n"
"edist[1] = dot(edgeEqn[1].xy, gl_FragCoord.xy) + edgeEqn[1].w;\n"
"edist[2] = dot(edgeEqn[2].xy, gl_FragCoord.xy) + edgeEqn[2].w;\n"
// "if (abs(edist[0]) > 0.5*lineWidth && abs(edist[1]) > 0.5*lineWidth && abs(edist[2]) >
// 0.5*lineWidth) discard;\n"
"if (edist[0] < -0.5 && edgeEqn[0].z > 0.0) discard;\n"
"if (edist[1] < -0.5 && edgeEqn[1].z > 0.0) discard;\n"
"if (edist[2] < -0.5 && edgeEqn[2].z > 0.0) discard;\n"
"edist[0] += edgeEqn[0].z;\n"
"edist[1] += edgeEqn[1].z;\n"
"edist[2] += edgeEqn[2].z;\n"
"float emix = clamp(0.5 + 0.5*lineWidth - min( min( edist[0], edist[1]), edist[2]), 0.0, "
"1.0);\n";
// Since "tubes" are faked using normals and lights, consider them disabled if we have no light
// in the scene.
bool canRenderLinesAsTube = actor->GetProperty()->GetRenderLinesAsTubes() &&
this->PrimitiveInfo[this->LastBoundBO].LastLightComplexity > 0;
if (canRenderLinesAsTube)
{
fsimpl +=
" diffuseColor = mix(diffuseColor, diffuseIntensity*edgeColor, emix * edgeOpacity);\n"
" ambientColor = mix(ambientColor, ambientIntensity*edgeColor, emix * edgeOpacity);\n"
// " else { discard; }\n" // this yields wireframe only
;
}
else
{
fsimpl += " diffuseColor = mix(diffuseColor, vec3(0.0), emix * edgeOpacity);\n"
" ambientColor = mix( ambientColor, edgeColor, emix * edgeOpacity);\n"
// " else { discard; }\n" // this yields wireframe only
;
}
vtkShaderProgram::Substitute(FSSource, "//VTK::Edges::Impl", fsimpl);
// even more fake tubes, for surface with edges this implementation
// just adjusts the normal calculation but not the zbuffer
if (canRenderLinesAsTube)
{
vtkShaderProgram::Substitute(FSSource, "//VTK::Normal::Impl",
"//VTK::Normal::Impl\n"
" float cdist = min(edist[0], edist[1]);\n"
" vec4 cedge = mix(edgeEqn[0], edgeEqn[1], 0.5 + 0.5*sign(edist[0] - edist[1]));\n"
" cedge = mix(cedge, edgeEqn[2], 0.5 + 0.5*sign(cdist - edist[2]));\n"
" vec3 tnorm = normalize(cross(normalVCVSOutput, cross(vec3(cedge.xy,0.0), "
"normalVCVSOutput)));\n"
" float rdist = 2.0*min(cdist, edist[2])/lineWidth;\n"
// these two lines adjust for the fact that normally part of the
// tube would be self occluded but as these are fake tubes this does
// not happen. The code adjusts the computed location on the tube as
// the surface normal dot view direction drops.
" float A = tnorm.z;\n"
" rdist = 0.5*rdist + 0.5*(rdist + A)/(1+abs(A));\n"
" float lenZ = clamp(sqrt(1.0 - rdist*rdist),0.0,1.0);\n"
" normalVCVSOutput = mix(normalVCVSOutput, normalize(rdist*tnorm + "
"normalVCVSOutput*lenZ), emix);\n");
}
shaders[vtkShader::Fragment]->SetSource(FSSource);
}
}
//------------------------------------------------------------------------------
void vtkOpenGLPolyDataMapper::ReplaceShaderColor(
std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer*, vtkActor* actor)
{
std::string VSSource = shaders[vtkShader::Vertex]->GetSource();
std::string GSSource = shaders[vtkShader::Geometry]->GetSource();
std::string FSSource = shaders[vtkShader::Fragment]->GetSource();
// these are always defined
std::string colorDec = "uniform float ambientIntensity; // the material ambient\n"
"uniform float diffuseIntensity; // the material diffuse\n"
"uniform float opacityUniform; // the fragment opacity\n"
"uniform vec3 ambientColorUniform; // ambient color\n"
"uniform vec3 diffuseColorUniform; // diffuse color\n";
std::string colorImpl;
// specular lighting?
if (this->PrimitiveInfo[this->LastBoundBO].LastLightComplexity)
{
colorDec += "uniform float specularIntensity; // the material specular intensity\n"
"uniform vec3 specularColorUniform; // intensity weighted color\n"
"uniform float specularPowerUniform;\n";
colorImpl += " vec3 specularColor = specularIntensity * specularColorUniform;\n"
" float specularPower = specularPowerUniform;\n";
}
// for point picking we render primitives as points
// that means cell scalars will not have correct
// primitiveIds to lookup into the texture map
// so we must skip cell scalar coloring when point picking
// handle color point attributes
if (this->VBOs->GetNumberOfComponents("scalarColor") != 0 && !this->DrawingVertices)
{
vtkShaderProgram::Substitute(VSSource, "//VTK::Color::Dec",
"in vec4 scalarColor;\n"
"out vec4 vertexColorVSOutput;");
vtkShaderProgram::Substitute(
VSSource, "//VTK::Color::Impl", "vertexColorVSOutput = scalarColor;");
vtkShaderProgram::Substitute(GSSource, "//VTK::Color::Dec",
"in vec4 vertexColorVSOutput[];\n"
"out vec4 vertexColorGSOutput;");
vtkShaderProgram::Substitute(
GSSource, "//VTK::Color::Impl", "vertexColorGSOutput = vertexColorVSOutput[i];");
colorDec += "in vec4 vertexColorVSOutput;\n";
colorImpl += " vec3 ambientColor = ambientIntensity * vertexColorVSOutput.rgb;\n"
" vec3 diffuseColor = diffuseIntensity * vertexColorVSOutput.rgb;\n"
" float opacity = opacityUniform * vertexColorVSOutput.a;";
}
// handle point color texture map coloring
else if (this->InterpolateScalarsBeforeMapping && this->ColorCoordinates &&
!this->DrawingVertices)
{
colorImpl += " vec4 texColor = texture(colortexture, colorTCoordVCVSOutput.st);\n"
" vec3 ambientColor = ambientIntensity * texColor.rgb;\n"
" vec3 diffuseColor = diffuseIntensity * texColor.rgb;\n"
" float opacity = opacityUniform * texColor.a;";
}
// are we doing cell scalar coloring by texture?
else if (this->HaveCellScalars && !this->DrawingVertices && !this->PointPicking)
{
colorImpl +=
" vec4 texColor = texelFetchBuffer(textureC, gl_PrimitiveID + PrimitiveIDOffset);\n"
" vec3 ambientColor = ambientIntensity * texColor.rgb;\n"
" vec3 diffuseColor = diffuseIntensity * texColor.rgb;\n"
" float opacity = opacityUniform * texColor.a;";
}
// just material but handle backfaceproperties
else
{
colorImpl += " vec3 ambientColor = ambientIntensity * ambientColorUniform;\n"
" vec3 diffuseColor = diffuseIntensity * diffuseColorUniform;\n"
" float opacity = opacityUniform;\n";
if (actor->GetBackfaceProperty() && !this->DrawingVertices)
{
colorDec += "uniform float opacityUniformBF; // the fragment opacity\n"
"uniform float ambientIntensityBF; // the material ambient\n"
"uniform float diffuseIntensityBF; // the material diffuse\n"
"uniform vec3 ambientColorUniformBF; // ambient material color\n"
"uniform vec3 diffuseColorUniformBF; // diffuse material color\n";
if (this->PrimitiveInfo[this->LastBoundBO].LastLightComplexity)
{
colorDec += "uniform float specularIntensityBF; // the material specular intensity\n"
"uniform vec3 specularColorUniformBF; // intensity weighted color\n"
"uniform float specularPowerUniformBF;\n";
colorImpl += " if (gl_FrontFacing == false) {\n"
" ambientColor = ambientIntensityBF * ambientColorUniformBF;\n"
" diffuseColor = diffuseIntensityBF * diffuseColorUniformBF;\n"
" specularColor = specularIntensityBF * specularColorUniformBF;\n"
" specularPower = specularPowerUniformBF;\n"
" opacity = opacityUniformBF; }\n";
}
else
{
colorImpl += " if (gl_FrontFacing == false) {\n"
" ambientColor = ambientIntensityBF * ambientColorUniformBF;\n"
" diffuseColor = diffuseIntensityBF * diffuseColorUniformBF;\n"
" opacity = opacityUniformBF; }\n";
}
}
}
if (this->HaveCellScalars && !this->DrawingVertices)
{
colorDec += "uniform samplerBuffer textureC;\n";
}
vtkShaderProgram::Substitute(FSSource, "//VTK::Color::Dec", colorDec);
vtkShaderProgram::Substitute(FSSource, "//VTK::Color::Impl", colorImpl);
shaders[vtkShader::Vertex]->SetSource(VSSource);
shaders[vtkShader::Geometry]->SetSource(GSSource);
shaders[vtkShader::Fragment]->SetSource(FSSource);
}
//------------------------------------------------------------------------------
void vtkOpenGLPolyDataMapper::ReplaceShaderLight(
std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* actor)
{
std::string FSSource = shaders[vtkShader::Fragment]->GetSource();
std::ostringstream toString;
// check for normal rendering
vtkInformation* info = actor->GetPropertyKeys();
if (info && info->Has(vtkLightingMapPass::RENDER_NORMALS()))
{
vtkShaderProgram::Substitute(FSSource, "//VTK::Light::Impl",
" vec3 n = (normalVCVSOutput + 1.0) * 0.5;\n"
" gl_FragData[0] = vec4(n.x, n.y, n.z, 1.0);");
shaders[vtkShader::Fragment]->SetSource(FSSource);
return;
}
// If rendering, set diffuse and specular colors to pure white
if (info && info->Has(vtkLightingMapPass::RENDER_LUMINANCE()))
{
vtkShaderProgram::Substitute(FSSource, "//VTK::Light::Impl",
" diffuseColor = vec3(1, 1, 1);\n"
" specularColor = vec3(1, 1, 1);\n"
" //VTK::Light::Impl\n",
false);
}
int lastLightComplexity = this->PrimitiveInfo[this->LastBoundBO].LastLightComplexity;
int lastLightCount = this->PrimitiveInfo[this->LastBoundBO].LastLightCount;
if (actor->GetProperty()->GetInterpolation() != VTK_PBR && lastLightCount == 0)
{
lastLightComplexity = 0;
}
bool hasIBL = false;
bool hasAnisotropy = false;
bool hasClearCoat = false;
if (actor->GetProperty()->GetInterpolation() == VTK_PBR && lastLightComplexity > 0)
{
// PBR functions
vtkShaderProgram::Substitute(FSSource, "//VTK::Light::Dec", vtkPBRFunctions);
// disable default behavior with textures
vtkShaderProgram::Substitute(FSSource, "//VTK::TCoord::Impl", "");
// get color and material from textures
std::vector<texinfo> textures = this->GetTextures(actor);
bool albedo = false;
bool material = false;
bool emissive = false;
toString.clear();
if (this->HaveTCoords(this->CurrentInput) && !this->DrawingVertices)
{
for (auto& t : textures)
{
if (t.second == "albedoTex")
{
albedo = true;
toString << "vec4 albedoSample = texture(albedoTex, tcoordVCVSOutput);\n"
" vec3 albedo = albedoSample.rgb * diffuseColor;\n"
" opacity = opacityUniform * albedoSample.a;\n";
}
else if (t.second == "materialTex")
{
// we are using GLTF specification here with a combined texture holding values for AO,
// roughness and metallic on R,G,B channels respectively
material = true;
toString << " vec4 material = texture(materialTex, tcoordVCVSOutput);\n"
" float roughness = material.g * roughnessUniform;\n"
" float metallic = material.b * metallicUniform;\n"
" float ao = material.r;\n";
}
else if (t.second == "emissiveTex")
{
emissive = true;
toString << " vec3 emissiveColor = texture(emissiveTex, tcoordVCVSOutput).rgb;\n"
" emissiveColor = emissiveColor * emissiveFactorUniform;\n";
}
// Anisotropy texture is sampled in ReplaceShaderNormal
}
}
vtkOpenGLRenderer* oglRen = vtkOpenGLRenderer::SafeDownCast(ren);
// IBL
if (oglRen && ren->GetUseImageBasedLighting())
{
hasIBL = true;
toString << " const float prefilterMaxLevel = float("
<< (oglRen->GetEnvMapPrefiltered()->GetPrefilterLevels() - 1) << ");\n";
}
if (!albedo)
{
// VTK colors are expressed in linear color space
toString << "vec3 albedo = diffuseColor;\n";
}
if (!material)
{
toString << " float roughness = roughnessUniform;\n";
toString << " float metallic = metallicUniform;\n";
toString << " float ao = 1.0;\n";
}
if (!emissive)
{
toString << " vec3 emissiveColor = vec3(0.0);\n";
}
toString << " vec3 N = normalVCVSOutput;\n"
" vec3 V = normalize(-vertexVC.xyz);\n"
" float NdV = clamp(dot(N, V), 1e-5, 1.0);\n";
if (actor->GetProperty()->GetAnisotropy() != 0.0 &&
this->VBOs->GetNumberOfComponents("normalMC") == 3 &&
this->VBOs->GetNumberOfComponents("tangentMC") == 3)
{
// anisotropy, tangentVC and bitangentVC are defined
hasAnisotropy = true;
// Load anisotropic functions
vtkShaderProgram::Substitute(FSSource, "//VTK::Define::Dec",
"#define ANISOTROPY\n"
"//VTK::Define::Dec");
// Precompute anisotropic parameters
// at and ab are the roughness along the tangent and bitangent
// Disney, as in OSPray
toString << " float r2 = roughness * roughness;\n"
" float aspect = sqrt(1.0 - 0.9 * anisotropy);\n";
toString << " float at = max(r2 / aspect, 0.001);\n"
" float ab = max(r2 * aspect, 0.001);\n";
toString << " float TdV = dot(tangentVC, V);\n"
" float BdV = dot(bitangentVC, V);\n";
}
hasClearCoat = actor->GetProperty()->GetCoatStrength() > 0.0;
if (hasClearCoat)
{
// Load clear coat uniforms
vtkShaderProgram::Substitute(FSSource, "//VTK::Define::Dec",
"#define CLEAR_COAT\n"
"//VTK::Define::Dec");
// Clear coat parameters
toString << " vec3 coatN = coatNormalVCVSOutput;\n";
toString << " float coatRoughness = coatRoughnessUniform;\n";
toString << " float coatStrength = coatStrengthUniform;\n";
toString << " float coatNdV = clamp(dot(coatN, V), 1e-5, 1.0);\n";
}
if (hasIBL)
{
if (!oglRen->GetUseSphericalHarmonics())
{
toString << " vec3 irradiance = texture(irradianceTex, envMatrix*N).rgb;\n";
}
else
{
toString << " vec3 rotN = envMatrix * N;\n";
toString << " vec3 irradiance = vec3(ComputeSH(rotN, shRed), ComputeSH(rotN, shGreen), "
"ComputeSH(rotN, shBlue));\n";
}
if (hasAnisotropy)