96 lines
3.0 KiB
C++
96 lines
3.0 KiB
C++
// boundariesrenderer.cpp
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//
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// Copyright (C) 2018-2019, the Celestia Development Team
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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#include <cassert>
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#include <numeric>
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#include <celengine/boundaries.h>
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#include <celutil/color.h>
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#include "boundariesrenderer.h"
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#include "render.h"
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#include "vecgl.h"
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using namespace Eigen;
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using namespace std;
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BoundariesRenderer::BoundariesRenderer(const ConstellationBoundaries *boundaries) :
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m_boundaries(boundaries)
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{
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m_shadprop.texUsage = ShaderProperties::VertexColors | ShaderProperties::LineAsTriangles;
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m_shadprop.lightModel = ShaderProperties::UnlitModel;
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}
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bool BoundariesRenderer::sameBoundaries(const ConstellationBoundaries *boundaries) const
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{
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return m_boundaries == boundaries;
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}
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void BoundariesRenderer::render(const Renderer &renderer, const Color &color, const Matrices &mvp)
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{
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auto *prog = renderer.getShaderManager().getShader(m_shadprop);
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if (prog == nullptr)
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return;
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m_vo.bind();
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if (!m_vo.initialized())
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{
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std::vector<LineEnds> data;
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if (!prepare(data))
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{
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m_vo.unbind();
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return;
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}
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m_vo.allocate(m_vtxTotal * sizeof(LineEnds), data.data());
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m_vo.setVertices(3, GL_FLOAT, false, sizeof(LineEnds), offsetof(LineEnds, point1));
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m_vo.setVertexAttribArray(CelestiaGLProgram::NextVCoordAttributeIndex, 3, GL_FLOAT, false, sizeof(LineEnds), offsetof(LineEnds, point2));
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m_vo.setVertexAttribArray(CelestiaGLProgram::ScaleFactorAttributeIndex, 1, GL_FLOAT, false, sizeof(LineEnds), offsetof(LineEnds, scale));
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}
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prog->use();
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prog->setMVPMatrices(*mvp.projection, *mvp.modelview);
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prog->lineWidthX = renderer.getLineWidthX();
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prog->lineWidthY = renderer.getLineWidthY();
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glVertexAttrib(CelestiaGLProgram::ColorAttributeIndex, color);
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m_vo.draw(GL_TRIANGLES, m_vtxTotal);
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m_vo.unbind();
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}
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bool BoundariesRenderer::prepare(std::vector<LineEnds> &data)
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{
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auto chains = m_boundaries->getChains();
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auto vtx_num = accumulate(chains.begin(), chains.end(), 0,
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[](int a, ConstellationBoundaries::Chain* b) { return a + b->size(); });
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if (vtx_num == 0)
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return false;
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// as we use GL_TRIANGLES we should six times the number of vertices
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vtx_num *= 6;
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m_vtxTotal = vtx_num;
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data.reserve(m_vtxTotal);
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for (const auto chain : chains)
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{
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for (unsigned i = 1; i < chain->size(); i++)
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{
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Eigen::Vector3f prev = (*chain)[i - 1];
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Eigen::Vector3f cur = (*chain)[i];
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data.emplace_back(prev, cur, -0.5);
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data.emplace_back(prev ,cur, 0.5);
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data.emplace_back(cur, prev, -0.5);
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data.emplace_back(cur, prev, -0.5);
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data.emplace_back(cur, prev, 0.5);
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data.emplace_back(prev, cur, -0.5);
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}
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}
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return true;
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}
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