mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-20 02:55:47 +00:00
2be7a8e032
The template parameters on vtkm::rendering::View are unnecessary. All three of the templated classes are polymorphic (with virtual functions). Thus, you just have to specify them at the constructor. Removing the template parameters makes the syntax a bit cleaner and removes some unnecessary duplication in the executable. Removing the template does mean we cannot optimize in the future. However, I expect us to start using more virtual methods rather than less, so I think this is a move in the right direction.
349 lines
10 KiB
C++
349 lines
10 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//
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// Copyright 2015 Sandia Corporation.
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// Copyright 2015 UT-Battelle, LLC.
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// Copyright 2015 Los Alamos National Security.
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_rendering_CanvasGL_h
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#define vtk_m_rendering_CanvasGL_h
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#include <vtkm/Types.h>
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#include <vtkm/rendering/Camera.h>
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#include <vtkm/rendering/Canvas.h>
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#include <vtkm/rendering/Color.h>
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#include <vtkm/rendering/BitmapFont.h>
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#include <vtkm/rendering/BitmapFontFactory.h>
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#include <vtkm/rendering/TextureGL.h>
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#include <vtkm/rendering/MatrixHelpers.h>
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#include <vtkm/rendering/internal/OpenGLHeaders.h>
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#include <iostream>
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#include <fstream>
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namespace vtkm {
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namespace rendering {
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class CanvasGL : public Canvas
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{
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public:
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VTKM_CONT_EXPORT
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CanvasGL(const vtkm::rendering::Color &c =
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vtkm::rendering::Color(0.0f,0.0f,0.0f,1.0f))
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: Canvas(0,0,c)
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{
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}
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VTKM_CONT_EXPORT
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virtual void Initialize()
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{
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// Nothing to initialize
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}
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VTKM_CONT_EXPORT
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virtual void Activate()
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{
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GLint viewport[4];
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glGetIntegerv(GL_VIEWPORT, viewport);
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this->ResizeBuffers(viewport[2], viewport[3]);
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glEnable(GL_DEPTH_TEST);
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}
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VTKM_CONT_EXPORT
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virtual void Clear()
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{
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vtkm::rendering::Color backgroundColor = this->GetBackgroundColor();
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glClearColor(backgroundColor.Components[0],
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backgroundColor.Components[1],
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backgroundColor.Components[2],
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1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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}
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VTKM_CONT_EXPORT
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virtual void Finish()
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{
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glFinish();
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}
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VTKM_CONT_EXPORT
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virtual void SetViewToWorldSpace(const vtkm::rendering::Camera &camera,
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bool clip)
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{
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vtkm::Float32 oglP[16], oglM[16];
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MatrixHelpers::CreateOGLMatrix(
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camera.CreateProjectionMatrix(this->GetWidth(),
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this->GetHeight()),
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oglP);
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glMatrixMode(GL_PROJECTION);
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glLoadMatrixf(oglP);
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MatrixHelpers::CreateOGLMatrix(camera.CreateViewMatrix(), oglM);
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glMatrixMode(GL_MODELVIEW);
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glLoadMatrixf(oglM);
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SetViewportClipping(camera, clip);
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}
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VTKM_CONT_EXPORT
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virtual void SetViewToScreenSpace(const vtkm::rendering::Camera &camera,
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bool clip)
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{
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vtkm::Float32 oglP[16] = {0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0};
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vtkm::Float32 oglM[16] = {0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0};
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oglP[0*4+0] = 1.;
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oglP[1*4+1] = 1.;
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oglP[2*4+2] = -1.;
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oglP[3*4+3] = 1.;
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glMatrixMode(GL_PROJECTION);
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glLoadMatrixf(oglP);
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oglM[0*4+0] = 1.;
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oglM[1*4+1] = 1.;
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oglM[2*4+2] = 1.;
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oglM[3*4+3] = 1.;
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glMatrixMode(GL_MODELVIEW);
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glLoadMatrixf(oglM);
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SetViewportClipping(camera, clip);
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}
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VTKM_CONT_EXPORT
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virtual void SetViewportClipping(
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const vtkm::rendering::Camera &camera, bool clip)
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{
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if (clip)
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{
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vtkm::Float32 vl, vr, vb, vt;
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camera.GetRealViewport(this->GetWidth(), this->GetHeight(),
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vl,vr,vb,vt);
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vtkm::Float32 _x = static_cast<vtkm::Float32>(this->GetWidth())*(1.f+vl)/2.f;
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vtkm::Float32 _y = static_cast<vtkm::Float32>(this->GetHeight())*(1.f+vb)/2.f;
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vtkm::Float32 _w = static_cast<vtkm::Float32>(this->GetWidth())*(vr-vl)/2.f;
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vtkm::Float32 _h = static_cast<vtkm::Float32>(this->GetHeight())*(vt-vb)/2.f;
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glViewport(static_cast<GLint>(_x), static_cast<GLint>(_y),
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static_cast<GLsizei>(_w), static_cast<GLsizei>(_h));
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}
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else
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{
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glViewport(0,
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0,
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static_cast<GLsizei>(this->GetWidth()),
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static_cast<GLsizei>(this->GetHeight()));
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}
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}
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VTKM_CONT_EXPORT
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virtual void RefreshColorBuffer()
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{
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GLint viewport[4];
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glGetIntegerv(GL_VIEWPORT, viewport);
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VTKM_ASSERT(viewport[2] == this->GetWidth());
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VTKM_ASSERT(viewport[3] == this->GetHeight());
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glReadPixels(viewport[0], viewport[1], viewport[2], viewport[3],
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GL_RGBA, GL_FLOAT,
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vtkm::cont::ArrayPortalToIteratorBegin(
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this->GetColorBuffer().GetPortalControl()));
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}
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VTKM_CONT_EXPORT
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virtual void RefreshDepthBuffer()
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{
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GLint viewport[4];
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glGetIntegerv(GL_VIEWPORT, viewport);
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VTKM_ASSERT(viewport[2] == this->GetWidth());
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VTKM_ASSERT(viewport[3] == this->GetHeight());
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glReadPixels(viewport[0], viewport[1], viewport[2], viewport[3],
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GL_DEPTH_COMPONENT, GL_FLOAT,
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vtkm::cont::ArrayPortalToIteratorBegin(
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this->GetDepthBuffer().GetPortalControl()));
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}
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VTKM_CONT_EXPORT
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virtual void AddLine(vtkm::Float64 x0, vtkm::Float64 y0,
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vtkm::Float64 x1, vtkm::Float64 y1,
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vtkm::Float32 linewidth,
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const vtkm::rendering::Color &c) const
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{
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glDisable(GL_DEPTH_TEST);
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glDisable(GL_LIGHTING);
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glColor3f(c.Components[0], c.Components[1], c.Components[2]);
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glLineWidth(linewidth);
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glBegin(GL_LINES);
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glVertex2f(float(x0),float(y0));
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glVertex2f(float(x1),float(y1));
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glEnd();
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}
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VTKM_CONT_EXPORT
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virtual void AddColorBar(vtkm::Float32 x, vtkm::Float32 y,
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vtkm::Float32 w, vtkm::Float32 h,
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const vtkm::rendering::ColorTable &ct,
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bool horizontal) const
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{
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const int n = 256;
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glDisable(GL_DEPTH_TEST);
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glDisable(GL_LIGHTING);
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glBegin(GL_QUADS);
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for (int i=0; i<n; i++)
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{
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vtkm::Float32 v0 = static_cast<vtkm::Float32>(i)/static_cast<vtkm::Float32>(n);
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vtkm::Float32 v1 = static_cast<vtkm::Float32>(i+1)/static_cast<vtkm::Float32>(n);
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Color c0 = ct.MapRGB(v0);
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Color c1 = ct.MapRGB(v1);
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if (horizontal)
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{
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vtkm::Float32 x0 = x + w*v0;
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vtkm::Float32 x1 = x + w*v1;
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vtkm::Float32 y0 = y;
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vtkm::Float32 y1 = y + h;
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glColor3f(c0.Components[0], c0.Components[1], c0.Components[2]);
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glVertex2f(x0,y0);
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glVertex2f(x0,y1);
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glColor3f(c1.Components[0], c1.Components[1], c1.Components[2]);
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glVertex2f(x1,y1);
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glVertex2f(x1,y0);
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}
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else // vertical
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{
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vtkm::Float32 x0 = x;
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vtkm::Float32 x1 = x + w;
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vtkm::Float32 y0 = y + h*v0;
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vtkm::Float32 y1 = y + h*v1;
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glColor3f(c0.Components[0], c0.Components[1], c0.Components[2]);
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glVertex2f(x0,y1);
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glVertex2f(x1,y1);
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glColor3f(c1.Components[0], c1.Components[1], c1.Components[2]);
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glVertex2f(x1,y0);
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glVertex2f(x0,y0);
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}
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}
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glEnd();
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}
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VTKM_CONT_EXPORT
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virtual void AddText(vtkm::Float32 x, vtkm::Float32 y,
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vtkm::Float32 scale,
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vtkm::Float32 angle,
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vtkm::Float32 windowaspect,
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vtkm::Float32 anchorx, vtkm::Float32 anchory,
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Color color,
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std::string text) const
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{
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glPushMatrix();
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glTranslatef(x,y,0);
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glScalef(1.f/windowaspect, 1, 1);
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glRotatef(angle, 0,0,1);
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glColor3f(color.Components[0], color.Components[1], color.Components[2]);
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this->RenderText(scale, anchorx, anchory, text);
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glPopMatrix();
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}
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private:
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BitmapFont Font;
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TextureGL FontTexture;
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void RenderText(vtkm::Float32 scale,
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vtkm::Float32 anchorx, vtkm::Float32 anchory,
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std::string text) const
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{
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if (this->FontTexture.ID == 0)
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{
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// When we load a font, we save a reference to it for the next time we
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// use it. Although technically we are changing the state, the logical
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// state does not change, so we go ahead and do it in this const
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// function.
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vtkm::rendering::CanvasGL *self =
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const_cast<vtkm::rendering::CanvasGL *>(this);
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self->Font = BitmapFontFactory::CreateLiberation2Sans();
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const std::vector<unsigned char> &rawpngdata =
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this->Font.GetRawImageData();
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std::vector<unsigned char> rgba;
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unsigned long width, height;
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int error = decodePNG(rgba, width, height,
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&rawpngdata[0], rawpngdata.size());
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if (error != 0)
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{
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return;
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}
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self->FontTexture.CreateAlphaFromRGBA(int(width),int(height),rgba);
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}
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this->FontTexture.Enable();
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glDepthMask(GL_FALSE);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glEnable(GL_BLEND);
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glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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glDisable(GL_LIGHTING);
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//glTexEnvf(GL_TEXTURE_FILTER_CONTROL, GL_TEXTURE_LOD_BIAS, -.5);
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glBegin(GL_QUADS);
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vtkm::Float32 textwidth = this->Font.GetTextWidth(text);
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vtkm::Float32 fx = -(.5f + .5f*anchorx) * textwidth;
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vtkm::Float32 fy = -(.5f + .5f*anchory);
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vtkm::Float32 fz = 0;
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for (unsigned int i=0; i<text.length(); ++i)
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{
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char c = text[i];
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char nextchar = (i < text.length()-1) ? text[i+1] : 0;
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vtkm::Float32 vl,vr,vt,vb;
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vtkm::Float32 tl,tr,tt,tb;
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this->Font.GetCharPolygon(c, fx, fy,
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vl, vr, vt, vb,
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tl, tr, tt, tb, nextchar);
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glTexCoord2f(tl, 1.f-tt);
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glVertex3f(scale*vl, scale*vt, fz);
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glTexCoord2f(tl, 1.f-tb);
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glVertex3f(scale*vl, scale*vb, fz);
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glTexCoord2f(tr, 1.f-tb);
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glVertex3f(scale*vr, scale*vb, fz);
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glTexCoord2f(tr, 1.f-tt);
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glVertex3f(scale*vr, scale*vt, fz);
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}
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glEnd();
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this->FontTexture.Disable();
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//glTexEnvf(GL_TEXTURE_FILTER_CONTROL, GL_TEXTURE_LOD_BIAS, 0);
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glDepthMask(GL_TRUE);
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glDisable(GL_ALPHA_TEST);
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}
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};
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}} //namespace vtkm::rendering
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#endif //vtk_m_rendering_CanvasGL_h
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