78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
// pointstarvertexbuffer.h
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//
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// Copyright (C) 2001-2019, the Celestia Development Team
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// Original version by Chris Laurel <claurel@gmail.com>
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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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#pragma once
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#include <Eigen/Core>
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#include "glshader.h"
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class Color;
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class Renderer;
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class Texture;
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// PointStarVertexBuffer is used when hardware supports point sprites.
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class PointStarVertexBuffer
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{
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public:
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using capacity_t = unsigned int;
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PointStarVertexBuffer(const Renderer& _renderer, unsigned int _capacity);
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~PointStarVertexBuffer();
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PointStarVertexBuffer() = delete;
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PointStarVertexBuffer(const PointStarVertexBuffer&) = delete;
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PointStarVertexBuffer(PointStarVertexBuffer&&) = delete;
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PointStarVertexBuffer& operator=(const PointStarVertexBuffer&) = delete;
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PointStarVertexBuffer& operator=(PointStarVertexBuffer&&) = delete;
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void startPoints();
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void startSprites();
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void render();
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void finish();
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inline void addStar(const Eigen::Vector3f& pos, const Color&, float);
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void setTexture(Texture* /*_texture*/);
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private:
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struct StarVertex
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{
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Eigen::Vector3f position;
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float size;
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unsigned char color[4];
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float pad;
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};
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const Renderer& renderer;
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capacity_t capacity;
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capacity_t nStars { 0 };
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StarVertex* vertices { nullptr };
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Texture* texture { nullptr };
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bool useSprites { false };
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IntegerShaderParameter starTexParam;
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};
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inline void PointStarVertexBuffer::addStar(const Eigen::Vector3f& pos,
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const Color& color,
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float size)
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{
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if (nStars < capacity)
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{
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vertices[nStars].position = pos;
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vertices[nStars].size = size;
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color.get(vertices[nStars].color);
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nStars++;
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}
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if (nStars == capacity)
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{
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render();
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nStars = 0;
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}
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}
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