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80 lines
3.9 KiB
C++
80 lines
3.9 KiB
C++
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2021 *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this *
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* software and associated documentation files (the "Software"), to deal in the Software *
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* without restriction, including without limitation the rights to use, copy, modify, *
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to *
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* permit persons to whom the Software is furnished to do so, subject to the following *
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* conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in all copies *
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* or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, *
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A *
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* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT *
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF *
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE *
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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****************************************************************************************/
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#ifndef __OPENSPACE_MODULE_GLOBEBROWSING___SKIRTEDGRID___H__
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#define __OPENSPACE_MODULE_GLOBEBROWSING___SKIRTEDGRID___H__
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#include <ghoul/glm.h>
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#include <ghoul/opengl/ghoul_gl.h>
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#include <vector>
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namespace openspace::globebrowsing {
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/**
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* This grid is a regular grid with skirts around its edges. The areas covered by the
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* skirts have position coordinates and texture coordinates that are outside of the range
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* [0, 1]. The width of the skirts is half the size of one segment width or a cell.
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*/
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class SkirtedGrid {
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public:
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/**
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* \param xSegments is the number of grid cells in the x direction.
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* \param ySegments is the number of grid cells in the y direction.
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* \param usePositions determines whether or not to upload any vertex position data
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* to the GPU.
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* \param useTextureCoordinates determines whether or not to upload any vertex texture
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* coordinate data to the GPU.
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* \param useNormals determines whether or not to upload any vertex normal data
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* to the GPU.
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*/
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SkirtedGrid(unsigned int xSegments, unsigned int ySegments);
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~SkirtedGrid() = default;
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void initializeGL();
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void deinitializeGL();
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/**
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* Calls OpenGL's draw function to draw the triangles defined in the vertex buffers
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* using the current bound program object.
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* The vertex buffer attribute input locations to the shader program comes in the
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* order of positions (0), texture coordinates (1) and normals (2).
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* The input locations in the shader program should be specified to match these
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* locations.
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*/
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void drawUsingActiveProgram() const;
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const int xSegments;
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const int ySegments;
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private:
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GLuint _vaoID = 0;
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GLuint _vertexBufferID = 0;
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GLuint _elementBufferID = 0;
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const GLsizei _elementSize;
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};
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} // namespace openspace::globebrowsing
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#endif // __OPENSPACE_MODULE_GLOBEBROWSING___SKIRTEDGRID___H__
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