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/* view.cc
This file is part of the Osirion project and is distributed under
the terms and conditions of the GNU General Public License version 2
*/
// C++ headers
#include <iostream>
// SDL headers
#include <SDL/SDL.h>
// project headers
#include "osirion.h"
#include "common/functions.h"
#include "game/game.h"
#include "gl/osiriongl.h"
#include "video.h"
#include "camera.h"
#include "shipdrawer.h"
#include "stardrawer.h"
namespace view
{
ShipDrawer *shipdrawer = 0;
StarDrawer *stardrawer = 0;
Ship *target =0; // the view's target
void init() {
// draw scene
if (!shipdrawer) {
stardrawer = new StarDrawer(&game::star);
shipdrawer = new ShipDrawer(&game::ship);
target = &game::ship;
}
}
void shutdown()
{
delete stardrawer;
stardrawer = 0;
delete shipdrawer;
shipdrawer = 0;
}
void reset() {
// Change to the projection matrix and set our viewing volume.
gl::matrixmode( GL_PROJECTION );
gl::loadidentity();
//glu::perspective( 64.0, video::ratio, 1.0, 1024.0 );
const float frustumsize=0.5f;
gl::frustum( -frustumsize * video::ratio, frustumsize * video::ratio, -frustumsize, frustumsize, 1.0f, 1024.0f);
/*
map world coordinates to GL coordinates
The world coordinates are identical to GL coordinates,
but the default viewing pitch (0 degrees)
is the positive X-axis
*/
gl::rotate(90.0f, 0, 1.0, 0);
}
void draw_background()
{
using namespace gl;
// // // enable Alpha blending
gl::enable(GL_BLEND);
// galactic axis
begin(Lines);
color(0.9f, 0.5f, 0.0f);
vertex(-2,0,0);
color(1.0f, 1.0f, 0.0f);
vertex(2,0,0);
vertex(0,0,-0.5);
vertex(0,0,0.5);
vertex(0,1.0f,0);
vertex(0,-1, 0);
end();
int gridsize = 32;
float s = 1.0f / gridsize;
float y = -4.0f;
float dx = target->location.x - floorf(target->location.x);
float dz = target->location.z - floorf(target->location.z);
color(0,0, 1.0f);
begin(Lines);
for (int i=-gridsize; i <= gridsize; i++) {
color(0,0, 0, 0);
vertex(i-dx, y, -gridsize-dz);
color(0,0, (gridsize-abs(i))*s, (gridsize-abs(i))*s);
vertex(i-dx, y, -dz);
vertex(i-dx, y, -dz);
color(0,0, 0, 0);
vertex(i-dx, y, gridsize-dz);
vertex(-gridsize-dx, y, i-dz);
color(0,0, (gridsize-abs(i))*s, (gridsize-abs(i))*s);
vertex(-dx, y, i-dz);
vertex(-dx, y, i-dz);
color(0,0, 0, 0);
vertex(gridsize-dx, y, i-dz);
}
end();
gl::disable(GL_BLEND);
}
void draw_world(float elapsed)
{
// draw the world
gl::push();
//std::cerr << "ship at " << game::ship.location << " translate " << game::ship.location - target->location << std::endl;
gl::translate(game::ship.location - target->location);
gl::scale(0.2f, 0.2f, 0.2f);
shipdrawer->draw(elapsed);
gl::pop();
//std::cerr << "star at " << game::star.location << " translate " << game::star.location - game::ship.location << std::endl;
gl::push();
gl::translate(game::star.location - target->location);
stardrawer->draw(elapsed);
gl::pop();
}
void draw(float elapsed)
{
// Clear the color and depth buffers.
gl::clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
// We don't want to modify the projection matrix.
gl::matrixmode( GL_MODELVIEW );
gl::loadidentity();
// Camera transformation
camera::draw(elapsed);
// draw the world
draw_world(elapsed);
// draw the semi-static background
draw_background();
SDL_GL_SwapBuffers( );
}
} // namespace view
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