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/*=========================================================================
Program: Visualization Toolkit
Module: vtkVRRay.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkVRRay.h"
#include "vtkMatrix4x4.h"
#include "vtkObjectFactory.h"
#include "vtkOpenGLRenderWindow.h"
#include "vtkOpenGLShaderCache.h"
#include "vtkOpenGLState.h"
#include "vtkOpenGLVertexArrayObject.h"
#include "vtkOpenGLVertexBufferObject.h"
#include "vtkRendererCollection.h"
#include "vtkShaderProgram.h"
#include "vtk_glew.h"
/*=========================================================================
vtkVRRay
=========================================================================*/
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkVRRay);
//------------------------------------------------------------------------------
vtkVRRay::vtkVRRay()
{
this->Show = false;
this->Length = 1.0f;
this->Loaded = false;
this->Color[0] = 1.f;
this->Color[1] = 0.f;
this->Color[2] = 0.f;
this->RayVBO = vtkOpenGLVertexBufferObject::New();
};
//------------------------------------------------------------------------------
vtkVRRay::~vtkVRRay()
{
this->RayVBO->Delete();
this->RayVBO = nullptr;
}
//------------------------------------------------------------------------------
void vtkVRRay::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "Loaded " << (this->Loaded ? "On\n" : "Off\n");
os << indent << "Show " << (this->Show ? "On\n" : "Off\n");
os << indent << "Length: " << this->Length << "\n";
os << indent << "Color: (" << this->Color[0] << ", " << this->Color[1] << "," << this->Color[2]
<< ")\n";
this->PoseMatrix->PrintSelf(os, indent);
}
//------------------------------------------------------------------------------
void vtkVRRay::ReleaseGraphicsResources(vtkRenderWindow* win)
{
this->RayVBO->ReleaseGraphicsResources();
this->RayHelper.ReleaseGraphicsResources(win);
}
//------------------------------------------------------------------------------
bool vtkVRRay::Build(vtkOpenGLRenderWindow* win)
{
// Ray geometry
float vert[] = { 0, 0, 0, 0, 0, -1 };
this->RayVBO->Upload(vert, 2 * 3, vtkOpenGLBufferObject::ArrayBuffer);
this->RayHelper.Program = win->GetShaderCache()->ReadyShaderProgram(
// vertex shader
"//VTK::System::Dec\n"
"uniform mat4 matrix;\n"
"uniform float scale;\n"
"in vec3 position;\n"
"void main()\n"
"{\n"
" gl_Position = matrix * vec4(scale * position, 1.0);\n"
"}\n",
// fragment shader
"//VTK::System::Dec\n"
"//VTK::Output::Dec\n"
"uniform vec3 color;\n"
"void main()\n"
"{\n"
" gl_FragData[0] = vec4(color, 1.0);\n"
"}\n",
// geom shader
"");
vtkShaderProgram* program = this->RayHelper.Program;
this->RayHelper.VAO->Bind();
if (!this->RayHelper.VAO->AddAttributeArray(
program, this->RayVBO, "position", 0, 3 * sizeof(float), VTK_FLOAT, 3, false))
{
vtkErrorMacro(<< "Error setting position in shader VAO.");
}
return true;
}
//------------------------------------------------------------------------------
void vtkVRRay::Render(vtkOpenGLRenderWindow* win, vtkMatrix4x4* poseMatrix)
{
// Load ray
if (!this->Loaded)
{
if (!this->Build(win))
{
vtkErrorMacro("Unable to build controller ray ");
}
this->Loaded = true;
}
// Render ray
win->GetState()->vtkglDepthMask(GL_TRUE);
win->GetShaderCache()->ReadyShaderProgram(this->RayHelper.Program);
this->RayHelper.VAO->Bind();
vtkRenderer* ren = static_cast<vtkRenderer*>(win->GetRenderers()->GetItemAsObject(0));
if (!ren)
{
vtkErrorMacro("Unable get renderer");
return;
}
double unitV[4] = { 0, 0, 0, 1 };
double scaleFactor = vtkMath::Norm(poseMatrix->MultiplyDoublePoint(unitV));
this->RayHelper.Program->SetUniformf("scale", this->Length / scaleFactor);
this->RayHelper.Program->SetUniform3f("color", this->Color);
this->RayHelper.Program->SetUniformMatrix("matrix", poseMatrix);
glDrawArrays(GL_LINES, 0, 6);
}
VTK_ABI_NAMESPACE_END
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