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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 "math/mathlib.h"
#include "model/vertexarray.h"
#include "sys/sys.h"
namespace model {
VertexArray *VertexArray::vertex_instance = 0 ;
VertexArray::VertexArray(size_t size)
{
vertex_instance = this;
vertex_size = size * 1024*1024; // megabytes
vertex_size = vertex_size / sizeof(float); // sizeof float
vertex_size = vertex_size / 4; // 4 arrays
vertex_vertex = (float *) malloc(vertex_size * sizeof(float));
vertex_color = (float *) malloc(vertex_size * sizeof(float));
vertex_normal = (float *) malloc(vertex_size * sizeof(float));
vertex_texture = (float *) malloc(vertex_size * sizeof(float));
con_print << "^BInitializing vertex array..." << std::endl;
con_print << " " << size << " Mb allocated" << std::endl;
clear();
}
VertexArray::~VertexArray()
{
free(vertex_vertex);
free(vertex_normal);
free(vertex_color);
free(vertex_texture);
vertex_instance = 0 ;
}
void VertexArray::clear()
{
vertex_index = 0;
memset(vertex_vertex, 0, sizeof(vertex_vertex));
memset(vertex_color, 0, sizeof(vertex_color));
memset(vertex_normal, 0, sizeof(vertex_normal));
memset(vertex_texture, 0, sizeof(vertex_normal));
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::Color white(1.0f, 1.0f, 1.0f);
math::Vector3f v;
math::Vector3f n;
math::Vector3f tex;
int count;
// 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();
tex.assign((float)i/(float)(SPHERESEGMENTS-1), -costable[j]/2 + 0.5f , 0);
add_vertex(v, n, white, tex);
v = math::Vector3f(r1*costable[i], r1*sintable[i], costable[j+1]);
n = v;
n.normalize();
tex.assign((float)i/(float)(SPHERESEGMENTS-1), -costable[j+1]/2 + 0.5f, 0);
add_vertex(v, n, white, tex);
count +=2;
}
}
// add inside-out sphere
for (int j=0; j < (SPHERESEGMENTS-1) / 2; j++) {
float r = sintable[j];
float r1 = sintable[j+1];
for (int i = SPHERESEGMENTS -1 ; i >= 0; i--) {
v = math::Vector3f(r*costable[i], r*sintable[i], costable[j]);
n = v;
n.normalize();
tex.assign(1-(float)i/(float)(SPHERESEGMENTS-1), -costable[j]/2 + 0.5f , 0);
add_vertex(v, n, white, tex);
v = math::Vector3f(r1*costable[i], r1*sintable[i], costable[j+1]);
n = v;
n.normalize();
tex.assign(1-(float)i/(float)(SPHERESEGMENTS-1), -costable[j+1]/2 + 0.5f, 0);
add_vertex(v, n, white, tex);
count +=2;
}
}
delete[] sintable;
delete[] costable;
}
void VertexArray::add_vertex(math::Vector3f const &v, math::Vector3f const &n, math::Color const &color) {
if (vertex_index + 3 >= vertex_size) {
con_warn << "VertexArray overflow!" << std::endl;
return;
}
for (int i = 0; i < 3; i ++) {
vertex_vertex[vertex_index+i] = v[i];
vertex_normal[vertex_index+i] = n[i];
}
vertex_color[vertex_index] = color.r;
vertex_color[vertex_index+1] = color.g;
vertex_color[vertex_index+2] = color.b;
vertex_index += 3;
}
void VertexArray::add_vertex(math::Vector3f const &v, math::Vector3f const &n, math::Color const &color, math::Vector3f const &tex) {
if (vertex_index + 3 >= vertex_size) {
con_warn << "VertexArray overflow!" << std::endl;
return;
}
for (int i = 0; i < 3; i ++) {
vertex_vertex[vertex_index+i] = v[i];
vertex_normal[vertex_index+i] = n[i];
vertex_texture[vertex_index+i] = tex[i];
}
vertex_color[vertex_index] = color.r;
vertex_color[vertex_index+1] = color.g;
vertex_color[vertex_index+2] = color.b;
vertex_index += 3;
}
}
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