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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 << "Initializing vertex array..." << std::endl;
	con_debug << "  " << 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;

	int count;

	for (int j=0; j < SPHERESEGMENTS-1; j++) {
		float r = sintable[j];
		float r1 = sintable[j+1];

		// glBegin
		v = math::Vector3f(r, 0, costable[j]);
		n = v;
		n.normalize();
		//normal(n);
		//vertex(v);
		add_vertex(v, n, white);

		v = math::Vector3f(r1, 0, costable[j+1]);
		n = v;
		n.normalize();
		//normal(n);
		//vertex(v);
		add_vertex(v, n, white);

		count =2;

		for (int i = SPHERESEGMENTS-1; i >= 0; i--) {
			v = math::Vector3f(r*costable[i], r*sintable[i], costable[j]);
			n = v;
			n.normalize();
			//normal(n);
			//vertex(v);
			add_vertex(v, n, white);
			
			v = math::Vector3f(r1*costable[i], r1*sintable[i], costable[j+1]);
			n = v;
			n.normalize();
			//normal(n);
			//vertex(v);
			add_vertex(v, n, white);
			count +=2;
		}
		// glEnd
		
	}

	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;
}

}