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Grid.cpp
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Grid.cpp
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#include "Grid.h"
std::vector<vertex> generateGridVertices(int gridN) {
std::vector<vertex> res;
float step = 0.25f;
for (int i = 0; i < gridN; ++i) {
res.push_back({i * step, -gridN * step, 0.f, {255, 255, 255}});
res.push_back({i * step, gridN * step, 0.f, {255, 255, 255}});
res.push_back({-i * step, -gridN * step, 0.f, {255, 255, 255}});
res.push_back({-i * step, gridN * step, 0.f, {255, 255, 255}});
res.push_back({-gridN * step, i * step, 0.f, {255, 255, 255}});
res.push_back({gridN * step, i * step, 0.f, {255, 255, 255}});
res.push_back({-gridN * step, -i * step, 0.f, {255, 255, 255}});
res.push_back({gridN * step, -i * step, 0.f, {255, 255, 255}});
}
return res;
}
Grid::Grid(int gridN) {
vertices = generateGridVertices(gridN);
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(vertex), vertices.data(), GL_STATIC_DRAW);
glEnableVertexAttribArray(0); // xy
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(vertex), (void*)nullptr);
glEnableVertexAttribArray(1); // z
glVertexAttribPointer(1, 1, GL_FLOAT, GL_FALSE, sizeof(vertex), (void*) offsetof(vertex, z));
glEnableVertexAttribArray(2); // color
glVertexAttribPointer(2, 3, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(vertex), (void*) offsetof(vertex, color));
}
void Grid::draw(float t) {
if (!doDraw) {
return;
}
glBindVertexArray(vao);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glDrawArrays(GL_LINES, 0, vertices.size());
}
void Grid::updateSettings(const std::map<int, int>& settings) {
doDraw = settings.at(DRAW_GRID);
}