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#include "lattice_cell_buffer.h"
#include <fstream>
LatticeCellBuffer::LatticeCellBuffer(GLuint nX, GLuint nY):
_data(9*nX*nY, GLfloat{1./9.}) {
glGenVertexArrays(1, &_array);
glGenBuffers(1, &_buffer);
const int inset = 0.4*nX;
for (int x = inset; x < nX-inset; x++) {
for (int y = inset; y < nY-inset; y++) {
for ( int i = -1; i <= 1; ++i ) {
for ( int j = -1; j <= 1; ++j ) {
_data[9*nX*y + 9*x + (i+1)*3 + j+1] = 1./64.;
}
}
}
}
glBindVertexArray(_array);
glBindBuffer(GL_ARRAY_BUFFER, _buffer);
glBufferData(
GL_ARRAY_BUFFER,
_data.size() * sizeof(GLfloat),
_data.data(),
GL_DYNAMIC_DRAW
);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 1, GL_FLOAT, GL_FALSE, 0, nullptr);
}
LatticeCellBuffer::~LatticeCellBuffer() {
glDeleteBuffers(1, &_buffer);
glDeleteVertexArrays(1, &_array);
}
GLuint LatticeCellBuffer::getBuffer() const {
return _buffer;
}
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