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vtkOpenGLContextDevice2D.cxx
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vtkOpenGLContextDevice2D.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkOpenGLContextDevice2D.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 "vtkOpenGLContextDevice2D.h"
#include "vtkAbstractContextBufferId.h"
#include "vtkBrush.h"
#include "vtkFloatArray.h"
#include "vtkImageData.h"
#include "vtkImageResize.h"
#include "vtkMath.h"
#include "vtkMatrix3x3.h"
#include "vtkNew.h"
#include "vtkObjectFactory.h"
#include "vtkOpenGLError.h"
#include "vtkOpenGLGL2PSHelper.h"
#include "vtkOpenGLIndexBufferObject.h"
#include "vtkOpenGLRenderWindow.h"
#include "vtkOpenGLRenderer.h"
#include "vtkOpenGLShaderCache.h"
#include "vtkOpenGLTexture.h"
#include "vtkOpenGLVertexArrayObject.h"
#include "vtkOpenGLVertexBufferObject.h"
#include "vtkPath.h"
#include "vtkPen.h"
#include "vtkPoints2D.h"
#include "vtkPointData.h"
#include "vtkPolyData.h"
#include "vtkRect.h"
#include "vtkShaderProgram.h"
#include "vtkSmartPointer.h"
#include "vtkTextProperty.h"
#include "vtkTextRenderer.h"
#include "vtkTexture.h"
#include "vtkTextureUnitManager.h"
#include "vtkTransform.h"
#include "vtkTransformFeedback.h"
#include "vtkVector.h"
#include "vtkViewport.h"
#include "vtkWindow.h"
#include "vtkOpenGLHelper.h"
#include "vtkObjectFactory.h"
#include "vtkOpenGLContextDevice2DPrivate.h"
#include <algorithm>
#include <sstream>
#define BUFFER_OFFSET(i) (reinterpret_cast<char *>(i))
namespace
{
void copyColors(std::vector<unsigned char> &newColors,
unsigned char *colors, int nc)
{
for (int j = 0; j < nc; j++)
{
newColors.push_back(colors[j]);
}
}
const char *myVertShader =
"attribute vec2 vertexMC;\n"
"uniform mat4 WCDCMatrix;\n"
"uniform mat4 MCWCMatrix;\n"
"#ifdef haveColors\n"
"attribute vec4 vertexScalar;\n"
"varying vec4 vertexColor;\n"
"#endif\n"
"#ifdef haveTCoords\n"
"attribute vec2 tcoordMC;\n"
"varying vec2 tcoord;\n"
"#endif\n"
"#ifdef haveLines\n"
"attribute vec2 tcoordMC;\n"
"varying float ldistance;\n"
"#endif\n"
"void main() {\n"
"#ifdef haveColors\n"
"vertexColor = vertexScalar;\n"
"#endif\n"
"#ifdef haveTCoords\n"
"tcoord = tcoordMC;\n"
"#endif\n"
"#ifdef haveLines\n"
"ldistance = tcoordMC.x;\n"
"#endif\n"
"vec4 vertex = vec4(vertexMC.xy, 0.0, 1.0);\n"
"gl_Position = vertex*MCWCMatrix*WCDCMatrix; }\n";
const char *myFragShader =
"//VTK::Output::Dec\n"
"#ifdef haveColors\n"
"varying vec4 vertexColor;\n"
"#else\n"
"uniform vec4 vertexColor;\n"
"#endif\n"
"#ifdef haveTCoords\n"
"varying vec2 tcoord;\n"
"uniform sampler2D texture1;\n"
"#endif\n"
"#ifdef haveLines\n"
"varying float ldistance;\n"
"uniform int stipple;\n"
"#endif\n"
"void main() {\n"
"#ifdef haveLines\n"
"if ((0x01 << int(mod(ldistance,16.0)) & stipple) == 0) { discard; }\n"
"#endif\n"
"#ifdef haveTCoords\n"
" gl_FragData[0] = texture2D(texture1, tcoord);\n"
"#else\n"
" gl_FragData[0] = vertexColor;\n"
"#endif\n"
"}\n";
//-----------------------------------------------------------------------------
// Returns true when rendering the GL2PS background raster image. Vectorizable
// primitives should not be drawn during these passes.
bool SkipDraw()
{
vtkOpenGLGL2PSHelper *gl2ps = vtkOpenGLGL2PSHelper::GetInstance();
if (gl2ps && gl2ps->GetActiveState() == vtkOpenGLGL2PSHelper::Background)
{
return true;
}
return false;
}
//-----------------------------------------------------------------------------
// Releases the current shader program if it is inconsistent with the GL2PS
// capture state. Returns the current OpenGLGL2PSHelper instance if one exists.
vtkOpenGLGL2PSHelper* PrepProgramForGL2PS(vtkOpenGLHelper &helper)
{
vtkOpenGLGL2PSHelper *gl2ps = vtkOpenGLGL2PSHelper::GetInstance();
if (gl2ps && gl2ps->GetActiveState() == vtkOpenGLGL2PSHelper::Capture)
{
// Always recreate the program when doing GL2PS capture.
if (helper.Program)
{
helper.Program->Delete();
helper.Program = nullptr;
}
}
else
{
// If there is a feedback transform capturer set on the current shader
// program and we're not capturing, recreate the program.
if (helper.Program && helper.Program->GetTransformFeedback())
{
helper.Program->Delete();
helper.Program = nullptr;
}
}
return gl2ps;
}
//-----------------------------------------------------------------------------
// Call before glDraw* commands to ensure that vertices are properly captured
// for GL2PS export.
void PreDraw(vtkOpenGLHelper &helper, int drawMode, size_t numVerts)
{
vtkOpenGLGL2PSHelper *gl2ps = vtkOpenGLGL2PSHelper::GetInstance();
if (gl2ps && gl2ps->GetActiveState() == vtkOpenGLGL2PSHelper::Capture &&
helper.Program)
{
if (vtkTransformFeedback *tfc = helper.Program->GetTransformFeedback())
{
tfc->SetNumberOfVertices(drawMode, numVerts);
tfc->BindBuffer();
}
}
}
//-----------------------------------------------------------------------------
// Call after glDraw* commands to ensure that vertices are properly captured
// for GL2PS export.
void PostDraw(vtkOpenGLHelper &helper, vtkRenderer *ren, unsigned char col[4])
{
vtkOpenGLGL2PSHelper *gl2ps = vtkOpenGLGL2PSHelper::GetInstance();
if (gl2ps && gl2ps->GetActiveState() == vtkOpenGLGL2PSHelper::Capture &&
helper.Program)
{
if (vtkTransformFeedback *tfc = helper.Program->GetTransformFeedback())
{
tfc->ReadBuffer();
tfc->ReleaseGraphicsResources();
gl2ps->ProcessTransformFeedback(tfc, ren, col);
tfc->ReleaseBufferData();
}
}
}
//-----------------------------------------------------------------------------
// Returns true if the startAngle and stopAngle (as used in the ellipse drawing
// functions) describe a full circle.
inline bool IsFullCircle(float startAngle, float stopAngle)
{
// A small number practical for rendering purposes.
const float TOL = 1e-5f;
return std::fabs(stopAngle - startAngle) + TOL >= 360.f;
}
} // end anon namespace
//-----------------------------------------------------------------------------
vtkStandardNewMacro(vtkOpenGLContextDevice2D)
//-----------------------------------------------------------------------------
vtkOpenGLContextDevice2D::vtkOpenGLContextDevice2D()
{
this->Renderer = nullptr;
this->InRender = false;
this->Storage = new vtkOpenGLContextDevice2D::Private;
this->PolyDataImpl = new vtkOpenGLContextDevice2D::CellArrayHelper(this);
this->RenderWindow = nullptr;
this->MaximumMarkerCacheSize = 20;
this->ProjectionMatrix = vtkTransform::New();
this->ModelMatrix = vtkTransform::New();
this->VBO = new vtkOpenGLHelper;
this->VCBO = new vtkOpenGLHelper;
this->LinesBO = new vtkOpenGLHelper;
this->LinesCBO = new vtkOpenGLHelper;
this->VTBO = new vtkOpenGLHelper;
this->SBO = new vtkOpenGLHelper;
this->SCBO = new vtkOpenGLHelper;
this->LinePattern = 0xFFFF;
}
//-----------------------------------------------------------------------------
vtkOpenGLContextDevice2D::~vtkOpenGLContextDevice2D()
{
delete this->VBO;
this->VBO = nullptr;
delete this->VCBO;
this->VCBO = nullptr;
delete this->LinesBO;
this->LinesBO = nullptr;
delete this->LinesCBO;
this->LinesCBO = nullptr;
delete this->SBO;
this->SBO = nullptr;
delete this->SCBO;
this->SCBO = nullptr;
delete this->VTBO;
this->VTBO = nullptr;
while (!this->MarkerCache.empty())
{
this->MarkerCache.back().Value->Delete();
this->MarkerCache.pop_back();
}
this->ProjectionMatrix->Delete();
this->ModelMatrix->Delete();
delete this->Storage;
delete this->PolyDataImpl;
}
vtkMatrix4x4 *vtkOpenGLContextDevice2D::GetProjectionMatrix()
{
return this->ProjectionMatrix->GetMatrix();
}
vtkMatrix4x4 *vtkOpenGLContextDevice2D::GetModelMatrix()
{
return this->ModelMatrix->GetMatrix();
}
//-----------------------------------------------------------------------------
void vtkOpenGLContextDevice2D::Begin(vtkViewport* viewport)
{
vtkOpenGLClearErrorMacro();
// Need the actual pixel size of the viewport - ask OpenGL.
GLint vp[4];
glGetIntegerv(GL_VIEWPORT, vp);
this->Storage->Offset.Set(static_cast<int>(vp[0]),
static_cast<int>(vp[1]));
this->Storage->Dim.Set(static_cast<int>(vp[2]),
static_cast<int>(vp[3]));
// push a 2D matrix on the stack
this->ProjectionMatrix->Push();
this->ProjectionMatrix->Identity();
this->PushMatrix();
this->ModelMatrix->Identity();
double offset = 0.5;
double xmin = offset;
double xmax = vp[2]+offset-1.0;
double ymin = offset;
double ymax = vp[3]+offset-1.0;
double znear = -2000;
double zfar = 2000;
double matrix[4][4];
vtkMatrix4x4::Identity(*matrix);
matrix[0][0] = 2/(xmax - xmin);
matrix[1][1] = 2/(ymax - ymin);
matrix[2][2] = -2/(zfar - znear);
matrix[0][3] = -(xmin + xmax)/(xmax - xmin);
matrix[1][3] = -(ymin + ymax)/(ymax - ymin);
matrix[2][3] = -(znear + zfar)/(zfar - znear);
this->ProjectionMatrix->SetMatrix(*matrix);
// Store the previous state before changing it
this->Storage->SaveGLState();
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
this->Renderer = vtkRenderer::SafeDownCast(viewport);
this->RenderWindow = vtkOpenGLRenderWindow::SafeDownCast(this->Renderer->GetRenderWindow());
this->RenderWindow->GetShaderCache()->ReleaseCurrentShader();
// Enable simple line smoothing if multisampling is on.
if (this->Renderer->GetRenderWindow()->GetMultiSamples())
{
glEnable(GL_LINE_SMOOTH);
}
this->InRender = true;
vtkOpenGLCheckErrorMacro("failed after Begin");
}
//-----------------------------------------------------------------------------
void vtkOpenGLContextDevice2D::End()
{
if (!this->InRender)
{
return;
}
this->ProjectionMatrix->Pop();
this->PopMatrix();
vtkOpenGLClearErrorMacro();
// Restore the GL state that we changed
this->Storage->RestoreGLState();
// Disable simple line smoothing if multisampling is on.
if (this->Renderer->GetRenderWindow()->GetMultiSamples())
{
glDisable(GL_LINE_SMOOTH);
}
this->RenderWindow = nullptr;
this->InRender = false;
vtkOpenGLCheckErrorMacro("failed after End");
}
// ----------------------------------------------------------------------------
void vtkOpenGLContextDevice2D::BufferIdModeBegin(
vtkAbstractContextBufferId *bufferId)
{
assert("pre: not_yet" && !this->GetBufferIdMode());
assert("pre: bufferId_exists" && bufferId!=nullptr);
vtkOpenGLClearErrorMacro();
this->BufferId=bufferId;
// Save OpenGL state.
this->Storage->SaveGLState(true);
int lowerLeft[2];
int usize, vsize;
this->Renderer->GetTiledSizeAndOrigin(&usize,&vsize,lowerLeft,lowerLeft+1);
// push a 2D matrix on the stack
this->ProjectionMatrix->Push();
this->ProjectionMatrix->Identity();
this->PushMatrix();
this->ModelMatrix->Identity();
double xmin = 0.5;
double xmax = usize+0.5;
double ymin = 0.5;
double ymax = vsize+0.5;
double znear = -1;
double zfar = 1;
double matrix[4][4];
vtkMatrix4x4::Identity(*matrix);
matrix[0][0] = 2/(xmax - xmin);
matrix[1][1] = 2/(ymax - ymin);
matrix[2][2] = -2/(zfar - znear);
matrix[0][3] = -(xmin + xmax)/(xmax - xmin);
matrix[1][3] = -(ymin + ymax)/(ymax - ymin);
matrix[2][3] = -(znear + zfar)/(zfar - znear);
this->ProjectionMatrix->SetMatrix(*matrix);
glDrawBuffer(GL_BACK_LEFT);
glClearColor(0.0,0.0,0.0,0.0); // id=0 means no hit, just background
glClear(GL_COLOR_BUFFER_BIT);
glDisable(GL_ALPHA_TEST);
glDisable(GL_STENCIL_TEST);
glDisable(GL_DEPTH_TEST);
glDisable(GL_BLEND);
vtkOpenGLCheckErrorMacro("failed after BufferIdModeBegin");
assert("post: started" && this->GetBufferIdMode());
}
// ----------------------------------------------------------------------------
void vtkOpenGLContextDevice2D::BufferIdModeEnd()
{
assert("pre: started" && this->GetBufferIdMode());
vtkOpenGLClearErrorMacro();
// Assume the renderer has been set previously during rendering (sse Begin())
int lowerLeft[2];
int usize, vsize;
this->Renderer->GetTiledSizeAndOrigin(&usize,&vsize,lowerLeft,lowerLeft+1);
this->BufferId->SetValues(lowerLeft[0],lowerLeft[1]);
this->ProjectionMatrix->Pop();
this->PopMatrix();
this->Storage->RestoreGLState(true);
this->BufferId=nullptr;
vtkOpenGLCheckErrorMacro("failed after BufferIdModeEnd");
assert("post: done" && !this->GetBufferIdMode());
}
void vtkOpenGLContextDevice2D::SetMatrices(vtkShaderProgram *prog)
{
prog->SetUniformMatrix("WCDCMatrix",
this->ProjectionMatrix->GetMatrix());
prog->SetUniformMatrix("MCWCMatrix",
this->ModelMatrix->GetMatrix());
}
void vtkOpenGLContextDevice2D::BuildVBO(
vtkOpenGLHelper *cellBO,
float *f, int nv,
unsigned char *colors, int nc,
float *tcoords)
{
int stride = 2;
int cOffset = 0;
int tOffset = 0;
if (colors)
{
cOffset = stride;
stride++;
}
if (tcoords)
{
tOffset = stride;
stride += 2;
}
std::vector<float> va;
va.resize(nv*stride);
vtkFourByteUnion c;
for (int i = 0; i < nv; i++)
{
va[i*stride] = f[i*2];
va[i*stride+1] = f[i*2+1];
if (colors)
{
c.c[0] = colors[nc*i];
c.c[1] = colors[nc*i+1];
c.c[2] = colors[nc*i+2];
if (nc == 4)
{
c.c[3] = colors[nc*i+3];
}
else
{
c.c[3] = 255;
}
va[i*stride+cOffset] = c.f;
}
if (tcoords)
{
va[i*stride+tOffset] = tcoords[i*2];
va[i*stride+tOffset+1] = tcoords[i*2+1];
}
}
// upload the data
cellBO->IBO->Upload(va, vtkOpenGLBufferObject::ArrayBuffer);
cellBO->VAO->Bind();
if (!cellBO->VAO->AddAttributeArray(
cellBO->Program, cellBO->IBO,
"vertexMC", 0,
sizeof(float)*stride,
VTK_FLOAT, 2, false))
{
vtkErrorMacro(<< "Error setting vertexMC in shader VAO.");
}
if (colors)
{
if (!cellBO->VAO->AddAttributeArray(
cellBO->Program, cellBO->IBO,
"vertexScalar", sizeof(float)*cOffset,
sizeof(float)*stride,
VTK_UNSIGNED_CHAR, 4, true))
{
vtkErrorMacro(<< "Error setting vertexScalar in shader VAO.");
}
}
if (tcoords)
{
if (!cellBO->VAO->AddAttributeArray(
cellBO->Program, cellBO->IBO,
"tcoordMC", sizeof(float)*tOffset,
sizeof(float)*stride,
VTK_FLOAT, 2, false))
{
vtkErrorMacro(<< "Error setting tcoordMC in shader VAO.");
}
}
cellBO->VAO->Bind();
}
void vtkOpenGLContextDevice2D::ReadyVBOProgram()
{
vtkOpenGLGL2PSHelper *gl2ps = PrepProgramForGL2PS(*this->VBO);
if (!this->VBO->Program)
{
vtkTransformFeedback *tf = nullptr;
if (gl2ps && gl2ps->GetActiveState() == vtkOpenGLGL2PSHelper::Capture)
{
tf = vtkTransformFeedback::New();
tf->AddVarying(vtkTransformFeedback::Vertex_ClipCoordinate_F,
"gl_Position");
}
std::string vs = "//VTK::System::Dec\n";
vs += myVertShader;
std::string fs = "//VTK::System::Dec\n";
fs +=myFragShader;
this->VBO->Program =
this->RenderWindow->GetShaderCache()->ReadyShaderProgram(
vs.c_str(), fs.c_str(),"",tf);
if (tf)
{
tf->Delete();
tf = nullptr;
}
}
else
{
this->RenderWindow->GetShaderCache()->ReadyShaderProgram(this->VBO->Program);
}
}
void vtkOpenGLContextDevice2D::ReadyVCBOProgram()
{
vtkOpenGLGL2PSHelper *gl2ps = PrepProgramForGL2PS(*this->VCBO);
if (!this->VCBO->Program)
{
vtkTransformFeedback *tf = nullptr;
if (gl2ps && gl2ps->GetActiveState() == vtkOpenGLGL2PSHelper::Capture)
{
tf = vtkTransformFeedback::New();
tf->AddVarying(vtkTransformFeedback::Vertex_ClipCoordinate_F,
"gl_Position");
tf->AddVarying(vtkTransformFeedback::Color_RGBA_F,
"vertexColor");
}
std::string vs = "//VTK::System::Dec\n#define haveColors\n";
vs += myVertShader;
std::string fs = "//VTK::System::Dec\n#define haveColors\n";
fs +=myFragShader;
this->VCBO->Program =
this->RenderWindow->GetShaderCache()->ReadyShaderProgram(
vs.c_str(), fs.c_str(),"",tf);
if (tf)
{
tf->Delete();
tf = nullptr;
}
}
else
{
this->RenderWindow->GetShaderCache()->ReadyShaderProgram(this->VCBO->Program);
}
}
void vtkOpenGLContextDevice2D::ReadyLinesBOProgram()
{
vtkOpenGLGL2PSHelper *gl2ps = PrepProgramForGL2PS(*this->VCBO);
if (!this->LinesBO->Program)
{
vtkTransformFeedback *tf = nullptr;
if (gl2ps && gl2ps->GetActiveState() == vtkOpenGLGL2PSHelper::Capture)
{
tf = vtkTransformFeedback::New();
tf->AddVarying(vtkTransformFeedback::Vertex_ClipCoordinate_F,
"gl_Position");
}
std::string vs = "//VTK::System::Dec\n#define haveLines\n";
vs += myVertShader;
std::string fs = "//VTK::System::Dec\n#define haveLines\n";
fs +=myFragShader;
this->LinesBO->Program =
this->RenderWindow->GetShaderCache()->ReadyShaderProgram(
vs.c_str(), fs.c_str(),"",tf);
if (tf)
{
tf->Delete();
tf = nullptr;
}
}
else
{
this->RenderWindow->GetShaderCache()->ReadyShaderProgram(
this->LinesBO->Program);
}
}
void vtkOpenGLContextDevice2D::ReadyLinesCBOProgram()
{
vtkOpenGLGL2PSHelper *gl2ps = PrepProgramForGL2PS(*this->VCBO);
if (!this->LinesCBO->Program)
{
vtkTransformFeedback *tf = nullptr;
if (gl2ps && gl2ps->GetActiveState() == vtkOpenGLGL2PSHelper::Capture)
{
tf = vtkTransformFeedback::New();
tf->AddVarying(vtkTransformFeedback::Vertex_ClipCoordinate_F,
"gl_Position");
tf->AddVarying(vtkTransformFeedback::Color_RGBA_F,
"vertexColor");
}
std::string vs =
"//VTK::System::Dec\n#define haveColors\n#define haveLines\n";
vs += myVertShader;
std::string fs =
"//VTK::System::Dec\n#define haveColors\n#define haveLines\n";
fs +=myFragShader;
this->LinesCBO->Program =
this->RenderWindow->GetShaderCache()->ReadyShaderProgram(
vs.c_str(), fs.c_str(),"",tf);
if (tf)
{
tf->Delete();
tf = nullptr;
}
}
else
{
this->RenderWindow->GetShaderCache()->ReadyShaderProgram(this->LinesCBO->Program);
}
}
void vtkOpenGLContextDevice2D::ReadyVTBOProgram()
{
if (!this->VTBO->Program)
{
std::string vs = "//VTK::System::Dec\n#define haveTCoords\n";
vs += myVertShader;
std::string fs = "//VTK::System::Dec\n#define haveTCoords\n";
fs +=myFragShader;
this->VTBO->Program =
this->RenderWindow->GetShaderCache()->ReadyShaderProgram(
vs.c_str(), fs.c_str(),"");
}
else
{
this->RenderWindow->GetShaderCache()->ReadyShaderProgram(this->VTBO->Program);
}
}
void vtkOpenGLContextDevice2D::ReadySBOProgram()
{
if (!this->SBO->Program)
{
this->SBO->Program =
this->RenderWindow->GetShaderCache()->ReadyShaderProgram(
// vertex shader
"//VTK::System::Dec\n"
"attribute vec2 vertexMC;\n"
"uniform mat4 WCDCMatrix;\n"
"uniform mat4 MCWCMatrix;\n"
"void main() {\n"
"vec4 vertex = vec4(vertexMC.xy, 0.0, 1.0);\n"
"gl_Position = vertex*MCWCMatrix*WCDCMatrix; }\n",
// fragment shader
"//VTK::System::Dec\n"
"//VTK::Output::Dec\n"
"uniform vec4 vertexColor;\n"
"uniform sampler2D texture1;\n"
"void main() { gl_FragData[0] = vertexColor*texture2D(texture1, gl_PointCoord); }",
// geometry shader
"");
}
else
{
this->RenderWindow->GetShaderCache()->ReadyShaderProgram(this->SBO->Program);
}
}
void vtkOpenGLContextDevice2D::ReadySCBOProgram()
{
if (!this->SCBO->Program)
{
this->SCBO->Program =
this->RenderWindow->GetShaderCache()->ReadyShaderProgram(
// vertex shader
"//VTK::System::Dec\n"
"attribute vec2 vertexMC;\n"
"attribute vec4 vertexScalar;\n"
"uniform mat4 WCDCMatrix;\n"
"uniform mat4 MCWCMatrix;\n"
"varying vec4 vertexColor;\n"
"void main() {\n"
"vec4 vertex = vec4(vertexMC.xy, 0.0, 1.0);\n"
"vertexColor = vertexScalar;\n"
"gl_Position = vertex*MCWCMatrix*WCDCMatrix; }\n",
// fragment shader
"//VTK::System::Dec\n"
"//VTK::Output::Dec\n"
"varying vec4 vertexColor;\n"
"uniform sampler2D texture1;\n"
"void main() { gl_FragData[0] = vertexColor*texture2D(texture1, gl_PointCoord); }",
// geometry shader
"");
}
else
{
this->RenderWindow->GetShaderCache()->ReadyShaderProgram(this->SCBO->Program);
}
}
//-----------------------------------------------------------------------------
void vtkOpenGLContextDevice2D::DrawPoly(float *f, int n, unsigned char *colors,
int nc)
{
assert("f must be non-null" && f != nullptr);
assert("n must be greater than 0" && n > 0);
if (SkipDraw())
{
return;
}
if (this->Pen->GetLineType() == vtkPen::NO_PEN)
{
return;
}
// Skip transparent elements.
if (!colors && this->Pen->GetColorObject().GetAlpha() == 0)
{
return;
}
vtkOpenGLClearErrorMacro();
this->SetLineType(this->Pen->GetLineType());
vtkOpenGLHelper *cbo = nullptr;
if (colors)
{
this->ReadyLinesCBOProgram();
cbo = this->LinesCBO;
}
else
{
this->ReadyLinesBOProgram();
cbo = this->LinesBO;
if (cbo->Program)
{
cbo->Program->SetUniform4uc("vertexColor",
this->Pen->GetColor());
}
}
if (!cbo->Program)
{
return;
}
cbo->Program->SetUniformi("stipple",this->LinePattern);
this->SetMatrices(cbo->Program);
// for line stipple we need to compute the scaled
// cumulative linear distance
double *scale = this->ModelMatrix->GetScale();
std::vector<float> distances;
distances.resize(n*2);
float totDist = 0.0;
distances[0] = 0.0;
for (int i = 1; i < n; i++)
{
float xDel = scale[0]*(f[i*2] - f[i*2-2]);
float yDel = scale[1]*(f[i*2+1] - f[i*2-1]);
totDist += sqrt(xDel*xDel + yDel*yDel);
distances[i*2] = totDist;
}
// For GL2PS captures, use the path that draws lines instead of triangles --
// GL2PS can handle stipples and linewidths just fine.
vtkOpenGLGL2PSHelper *gl2ps = vtkOpenGLGL2PSHelper::GetInstance();
if (this->Pen->GetWidth() > 1.0 &&
!(gl2ps && gl2ps->GetActiveState() == vtkOpenGLGL2PSHelper::Capture))
{
// convert to triangles and draw, this is because
// OpenGL no longer supports wide lines directly
float hwidth = this->Pen->GetWidth()/2.0;
std::vector<float> newVerts;
std::vector<unsigned char> newColors;
std::vector<float> newDistances;
newDistances.resize((n-1)*12);
for (int i = 0; i < n-1; i++)
{
// for each line segment draw two triangles
// start by computing the direction
vtkVector2f dir((f[i*2+2] - f[i*2])*scale[0],
(f[i*2+3] - f[i*2+1])*scale[1]);
vtkVector2f norm(-dir.GetY(),dir.GetX());
norm.Normalize();
norm.SetX(hwidth*norm.GetX()/scale[0]);
norm.SetY(hwidth*norm.GetY()/scale[1]);
newVerts.push_back(f[i*2]+norm.GetX());
newVerts.push_back(f[i*2+1]+norm.GetY());
newVerts.push_back(f[i*2]-norm.GetX());
newVerts.push_back(f[i*2+1]-norm.GetY());
newVerts.push_back(f[i*2+2]-norm.GetX());
newVerts.push_back(f[i*2+3]-norm.GetY());
newVerts.push_back(f[i*2]+norm.GetX());
newVerts.push_back(f[i*2+1]+norm.GetY());
newVerts.push_back(f[i*2+2]-norm.GetX());
newVerts.push_back(f[i*2+3]-norm.GetY());
newVerts.push_back(f[i*2+2]+norm.GetX());
newVerts.push_back(f[i*2+3]+norm.GetY());
if (colors)
{
copyColors(newColors, colors+i*nc, nc);
copyColors(newColors, colors+i*nc, nc);
copyColors(newColors, colors+(i+1)*nc, nc);
copyColors(newColors, colors+i*nc, nc);
copyColors(newColors, colors+(i+1)*nc, nc);
copyColors(newColors, colors+(i+1)*nc, nc);
}
newDistances[i*12] = distances[i*2];
newDistances[i*12+2] = distances[i*2];
newDistances[i*12+4] = distances[i*2+2];
newDistances[i*12+6] = distances[i*2];
newDistances[i*12+8] = distances[i*2+2];
newDistances[i*12+10] = distances[i*2+2];
}
this->BuildVBO(cbo, &(newVerts[0]), newVerts.size()/2,
colors ? &(newColors[0]) : nullptr, nc, &(newDistances[0]));
PreDraw(*cbo, GL_TRIANGLES, newVerts.size() / 2);
glDrawArrays(GL_TRIANGLES, 0, newVerts.size()/2);
PostDraw(*cbo, this->Renderer, this->Pen->GetColor());
}
else
{
this->SetLineWidth(this->Pen->GetWidth());
this->BuildVBO(cbo, f, n, colors, nc, &(distances[0]));
PreDraw(*cbo, GL_LINE_STRIP, n);
glDrawArrays(GL_LINE_STRIP, 0, n);
PostDraw(*cbo, this->Renderer, this->Pen->GetColor());
this->SetLineWidth(1.0);
}
// free everything
cbo->ReleaseGraphicsResources(this->RenderWindow);
vtkOpenGLCheckErrorMacro("failed after DrawPoly");
}
//-----------------------------------------------------------------------------
void vtkOpenGLContextDevice2D::DrawLines(float *f, int n, unsigned char *colors,
int nc)
{
assert("f must be non-null" && f != nullptr);
assert("n must be greater than 0" && n > 0);
if (SkipDraw())
{
return;
}
if (this->Pen->GetLineType() == vtkPen::NO_PEN)
{
return;
}
// Skip transparent elements.
if (!colors && this->Pen->GetColorObject().GetAlpha() == 0)
{
return;
}
vtkOpenGLClearErrorMacro();
this->SetLineType(this->Pen->GetLineType());
vtkOpenGLHelper *cbo = nullptr;
if (colors)
{
this->ReadyLinesCBOProgram();
cbo = this->LinesCBO;
}
else
{
this->ReadyLinesBOProgram();
cbo = this->LinesBO;
if (!cbo->Program)
{
return;
}
cbo->Program->SetUniform4uc("vertexColor",
this->Pen->GetColor());
}
if (!cbo->Program)
{
return;
}
cbo->Program->SetUniformi("stipple",this->LinePattern);
this->SetMatrices(cbo->Program);
// for line stipple we need to compute the scaled
// cumulative linear distance
double *scale = this->ModelMatrix->GetScale();
std::vector<float> distances;
distances.resize(n*2);
float totDist = 0.0;
distances[0] = 0.0;
for (int i = 1; i < n; i++)
{
float xDel = scale[0]*(f[i*2] - f[i*2-2]);
float yDel = scale[1]*(f[i*2+1] - f[i*2-1]);
totDist += sqrt(xDel*xDel + yDel*yDel);
distances[i*2] = totDist;
}
if (this->Pen->GetWidth() > 1.0)
{
// convert to triangles and draw, this is because
// OpenGL no longer supports wide lines directly
float hwidth = this->Pen->GetWidth()/2.0;
std::vector<float> newVerts;
std::vector<unsigned char> newColors;
std::vector<float> newDistances;
newDistances.resize((n/2)*12);
for (int i = 0; i < n-1; i += 2)
{
// for each line segment draw two triangles
// start by computing the direction
vtkVector2f dir((f[i*2+2] - f[i*2])*scale[0],
(f[i*2+3] - f[i*2+1])*scale[1]);
vtkVector2f norm(-dir.GetY(),dir.GetX());
norm.Normalize();
norm.SetX(hwidth*norm.GetX()/scale[0]);
norm.SetY(hwidth*norm.GetY()/scale[1]);
newVerts.push_back(f[i*2]+norm.GetX());
newVerts.push_back(f[i*2+1]+norm.GetY());