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/*
model/vertexarray.cc
This file is part of the Osirion project and is distributed under
the terms of the GNU General Public License version 2
*/
#include <cstring>
#include <cassert>
#include "math/mathlib.h"
#include "model/vertexarray.h"
#include "sys/sys.h"
namespace model
{
VertexArray *VertexArray::vertexarray_instance = 0 ;
VertexArray::VertexArray(size_t size)
{
assert(size > 0);
vertexarray_instance = this;
vertexarray_size = size * 1024 * 1024; // megabytes
vertexarray_size = vertexarray_size / sizeof(float); // sizeof float
vertexarray_data = (float *) malloc(vertexarray_size * sizeof(float));
con_print << "^BInitializing vertex array..." << std::endl;
con_print << " " << (vertexarray_size * sizeof(float)) / (1024 * 1024) << " Mb allocated" << std::endl;
clear();
}
VertexArray::~VertexArray()
{
free(vertexarray_data);
vertexarray_instance = 0 ;
}
void VertexArray::clear()
{
vertexarray_dirty = true;
vertexarray_index = 0;
vertexarray_overflow = false;
memset(vertexarray_data, 0, sizeof(vertexarray_data));
add_sphere();
}
void VertexArray::add_sphere()
{
// load sphere vertices into the VertexArray
// build sin/cos table
float *sintable;
float *costable;
sintable = new float[SPHERESEGMENTS];
costable = new float[SPHERESEGMENTS];
float d = 2 * M_PI / (SPHERESEGMENTS - 1);
for (int i = 0; i < SPHERESEGMENTS; i++) {
sintable[i] = sin(d * (float) i);
costable[i] = cos(d * (float) i);
}
// draw body
math::Vector3f v;
math::Vector3f n;
float texx, texy;
int quad_count = 0;
// add sphere
for (int j = 0; j < (SPHERESEGMENTS - 1) / 2; j++) {
float r = sintable[j];
float r1 = sintable[j+1];
for (int i = 0; i < SPHERESEGMENTS; i++) {
v = math::Vector3f(r * costable[i], r * sintable[i], costable[j]);
n = v;
n.normalize();
texx = (float)i / (float)(SPHERESEGMENTS - 1);
texy = 2.0f * (float) j / (float)(SPHERESEGMENTS - 1);
add_vertex(v, n, texx, texy);
v = math::Vector3f(r1 * costable[i], r1 * sintable[i], costable[j+1]);
n = v;
n.normalize();
texx = (float)i / (float)(SPHERESEGMENTS - 1);
texy = 2.0f * (float)(j + 1) / (float)(SPHERESEGMENTS - 1);
add_vertex(v, n, texx, texy);
quad_count++;
}
quad_count--;
}
delete[] sintable;
delete[] costable;
}
size_t VertexArray::add_vertex(math::Vector3f const &v, math::Vector3f const &n, float tex_x, float tex_y)
{
if (vertexarray_index + 8 >= vertexarray_size) {
if (!vertexarray_overflow) {
con_warn << "VertexArray overflow!" << std::endl;
vertexarray_overflow = true;
}
return 0;
}
// GL_T2F_N3F_V3F
// texture coordinates
vertexarray_data[vertexarray_index] = tex_x;
vertexarray_data[vertexarray_index+1] = tex_y;
for (int i = 0; i < 3; i ++) {
// normal
vertexarray_data[vertexarray_index+2+i] = n[i];
// vertex coordinates
vertexarray_data[vertexarray_index+5+i] = v[i];
}
vertexarray_index += 8;
vertexarray_dirty = true;
return 1;
}
void VertexArray::info() {
const size_t mbfl = 1024 * 1024 / sizeof(float);
con_print << " vertex array "
<< vertexarray_index / mbfl << "/" << vertexarray_size / mbfl << "Mib "
<< vertexarray_index / 8 << "/" << vertexarray_size / 8 << " verts "
<< "^B" << vertexarray_index * 100 / vertexarray_size << "%^N used" << std::endl;
}
}
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