mirror of
https://github.com/OpenSpace/OpenSpace.git
synced 2026-01-14 07:49:35 -06:00
291 lines
9.8 KiB
C++
291 lines
9.8 KiB
C++
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2016 *
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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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#include <modules/globebrowsing/rendering/clipmapgeometry.h>
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#include <ghoul/opengl/ghoul_gl.h>
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namespace {
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const std::string _loggerCat = "ClipMapGeometry";
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}
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namespace openspace {
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ClipMapGeometry::ClipMapGeometry(
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unsigned int resolution,
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Positions usePositions,
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TextureCoordinates useTextures,
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Normals useNormals)
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: Geometry(CreateElements(resolution), usePositions, useTextures, useNormals)
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, _resolution(resolution)
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{
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if(_useVertexPositions){
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setVertexPositions(CreatePositions(_resolution));
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}
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if (_useTextureCoordinates) {
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setVertexTextureCoordinates(CreateTextureCoordinates(_resolution));
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}
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if (_useVertexNormals) {
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setVertexNormals(CreateNormals(_resolution));
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}
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}
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ClipMapGeometry::~ClipMapGeometry()
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{
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}
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const unsigned int ClipMapGeometry::resolution() const {
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return _resolution;
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}
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size_t ClipMapGeometry::numElements(unsigned int resolution)
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{
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int numElementsInTotalSquare = 6 * (resolution + 1) * (resolution + 1);
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int numElementsInHole = 6 * (resolution / 4 * resolution / 4);
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return numElementsInTotalSquare - numElementsInHole;
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}
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size_t ClipMapGeometry::numVerticesBottom(unsigned int resolution)
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{
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return (resolution + 1 + 2) * (resolution / 4 + 1 + 1);
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}
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size_t ClipMapGeometry::numVerticesLeft(unsigned int resolution)
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{
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return (resolution / 4 + 1 + 1) * (resolution / 2 + 1);
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}
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size_t ClipMapGeometry::numVerticesRight(unsigned int resolution)
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{
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return (resolution / 4 + 1 + 1) * (resolution / 2 + 1);
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}
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size_t ClipMapGeometry::numVerticesTop(unsigned int resolution)
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{
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return (resolution + 1 + 2) * (resolution / 4 + 1 + 1);
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}
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size_t ClipMapGeometry::numVertices(unsigned int resolution)
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{
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return numVerticesBottom(resolution) +
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numVerticesLeft(resolution) +
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numVerticesRight(resolution) +
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numVerticesTop(resolution);
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}
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void ClipMapGeometry::validate(unsigned int resolution) {
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ghoul_assert(resolution >= 8,
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"Resolution must be at least 8. (" << resolution << ")");
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ghoul_assert(resolution == pow(2, int(log2(resolution))),
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"Resolution must be a power of 2. (" << resolution << ")");
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}
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std::vector<GLuint> ClipMapGeometry::CreateElements(unsigned int resolution) {
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validate(resolution);
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std::vector<GLuint> elements;
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elements.reserve(numElements(resolution));
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// The clipmap geometry is built up by four parts as follows:
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// 0 = Bottom part
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// 1 = Left part
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// 2 = Right part
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// 3 = Top part
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//
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// 33333333
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// 33333333
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// 11 22
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// 11 22
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// 00000000
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// 00000000
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// x v01---v11 x ..
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// | / |
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// x v00---v10 x ..
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//
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// x x x x ..
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// : : : :
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unsigned int previousVerts[4];
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previousVerts[0] = 0;
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previousVerts[1] = previousVerts[0] + numVerticesBottom(resolution);
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previousVerts[2] = previousVerts[1] + numVerticesLeft(resolution);
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previousVerts[3] = previousVerts[2] + numVerticesRight(resolution);
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// Build the bottom part of the clipmap geometry
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for (unsigned int y = 0; y < resolution / 4 + 1; y++) {
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for (unsigned int x = 0; x < resolution + 2; x++) {
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GLuint v00 = previousVerts[0] + (y + 0) * (resolution + 3) + x + 0;
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GLuint v10 = previousVerts[0] + (y + 0) * (resolution + 3) + x + 1;
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GLuint v01 = previousVerts[0] + (y + 1) * (resolution + 3) + x + 0;
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GLuint v11 = previousVerts[0] + (y + 1) * (resolution + 3) + x + 1;
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elements.push_back(v00);
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elements.push_back(v10);
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elements.push_back(v11);
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elements.push_back(v00);
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elements.push_back(v11);
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elements.push_back(v01);
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}
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}
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// Build the left part of the clipmap geometry
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for (unsigned int y = 0; y < resolution / 2; y++) {
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for (unsigned int x = 0; x < resolution / 4 + 1; x++) {
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GLuint v00 = previousVerts[1] + (y + 0) * (resolution / 4 + 2) + x + 0;
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GLuint v10 = previousVerts[1] + (y + 0) * (resolution / 4 + 2) + x + 1;
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GLuint v01 = previousVerts[1] + (y + 1) * (resolution / 4 + 2) + x + 0;
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GLuint v11 = previousVerts[1] + (y + 1) * (resolution / 4 + 2) + x + 1;
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elements.push_back(v00);
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elements.push_back(v10);
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elements.push_back(v11);
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elements.push_back(v00);
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elements.push_back(v11);
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elements.push_back(v01);
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}
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}
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// Build the left part of the clipmap geometry
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for (unsigned int y = 0; y < resolution / 2; y++) {
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for (unsigned int x = 0; x < resolution / 4 + 1; x++) {
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GLuint v00 = previousVerts[2] + (y + 0) * (resolution / 4 + 2) + x + 0;
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GLuint v10 = previousVerts[2] + (y + 0) * (resolution / 4 + 2) + x + 1;
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GLuint v01 = previousVerts[2] + (y + 1) * (resolution / 4 + 2) + x + 0;
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GLuint v11 = previousVerts[2] + (y + 1) * (resolution / 4 + 2) + x + 1;
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elements.push_back(v00);
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elements.push_back(v10);
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elements.push_back(v11);
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elements.push_back(v00);
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elements.push_back(v11);
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elements.push_back(v01);
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}
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}
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// Build the left part of the clipmap geometry
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for (unsigned int y = 0; y < resolution / 4 + 1; y++) {
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for (unsigned int x = 0; x < resolution + 2; x++) {
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GLuint v00 = previousVerts[3] + (y + 0) * (resolution + 3) + x + 0;
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GLuint v10 = previousVerts[3] + (y + 0) * (resolution + 3) + x + 1;
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GLuint v01 = previousVerts[3] + (y + 1) * (resolution + 3) + x + 0;
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GLuint v11 = previousVerts[3] + (y + 1) * (resolution + 3) + x + 1;
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elements.push_back(v00);
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elements.push_back(v10);
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elements.push_back(v11);
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elements.push_back(v00);
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elements.push_back(v11);
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elements.push_back(v01);
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}
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}
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return elements;
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}
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std::vector<glm::vec4> ClipMapGeometry::CreatePositions(unsigned int resolution)
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{
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validate(resolution);
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std::vector<glm::vec4> positions;
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positions.reserve(numVertices(resolution));
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std::vector<glm::vec2> templateTextureCoords = CreateTextureCoordinates(resolution);
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// Copy from 2d texture coordinates and use as template to create positions
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for (unsigned int i = 0; i < templateTextureCoords.size(); i++) {
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positions.push_back(
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glm::vec4(
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templateTextureCoords[i].x,
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templateTextureCoords[i].y,
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0,
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1));
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}
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return positions;
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}
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std::vector<glm::vec2> ClipMapGeometry::CreateTextureCoordinates(unsigned int resolution){
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validate(resolution);
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std::vector<glm::vec2> textureCoordinates;
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textureCoordinates.reserve(numVertices(resolution));
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// Resolution needs to be an int to compare with negative numbers
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int intResolution = resolution;
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// Build the bottom part of the clipmap geometry
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for (int y = -1; y < intResolution / 4 + 1; y++) {
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for (int x = -1; x < intResolution + 2; x++) {
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textureCoordinates.push_back(glm::vec2(
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static_cast<float>(x) / intResolution,
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static_cast<float>(y) / intResolution));
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}
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}
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// Build the left part of the clipmap geometry
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for (int y = intResolution / 4; y < 3 * intResolution / 4 + 1; y++) {
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for (int x = -1; x < intResolution / 4 + 1; x++) {
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textureCoordinates.push_back(glm::vec2(
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static_cast<float>(x) / intResolution,
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static_cast<float>(y) / intResolution));
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}
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}
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// Build the right part of the clipmap geometry
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for (int y = intResolution / 4; y < 3 * intResolution / 4 + 1; y++) {
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for (int x = 3 * intResolution / 4; x < intResolution + 2; x++) {
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float u = static_cast<float>(x) / intResolution;
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float v = static_cast<float>(y) / intResolution;
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textureCoordinates.push_back(glm::vec2(u, v));
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}
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}
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// Build the top part of the clipmap geometry
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for (int y = 3 * intResolution / 4; y < intResolution + 2; y++) {
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for (int x = -1; x < intResolution + 2; x++) {
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textureCoordinates.push_back(glm::vec2(
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static_cast<float>(x) / intResolution,
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static_cast<float>(y) / intResolution));
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}
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}
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return textureCoordinates;
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}
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std::vector<glm::vec3> ClipMapGeometry::CreateNormals(unsigned int resolution) {
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validate(resolution);
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std::vector<glm::vec3> normals;
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normals.reserve(numVertices(resolution));
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for (unsigned int y = 0; y < resolution + 1; y++) {
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for (unsigned int x = 0; x < resolution + 1; x++) {
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normals.push_back(glm::vec3(0, 0, 1));
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}
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}
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return normals;
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}
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}// namespace openspace
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