paysages3d/gui_qt/wandererchunk.cpp

242 lines
7.8 KiB
C++

#include "wandererchunk.h"
#include <QMutex>
#include <QImage>
#include <QColor>
#include <QGLWidget>
#include <math.h>
#include "../lib_paysages/camera.h"
#include "../lib_paysages/color.h"
#include "../lib_paysages/euclid.h"
#include "../lib_paysages/tools.h"
WandererChunk::WandererChunk(Renderer* renderer, double x, double z, double size, int nbchunks)
{
_renderer = renderer;
_startx = x;
_startz = z;
_size = size;
_overall_step = size * (double)nbchunks;
_restart_needed = false;
priority = 0.0;
_tessellation_max_size = 32;
_tessellation = new double[(_tessellation_max_size + 1) * (_tessellation_max_size + 1)];
_tessellation_current_size = 0;
_tessellation_step = _size / (double)_tessellation_max_size;
_texture_max_size = 128;
_texture_current_size = 0;
_texture = new QImage(1, 1, QImage::Format_ARGB32);
_texture_id = 0;
_texture_changed = false;
maintain();
}
WandererChunk::~WandererChunk()
{
_lock_data.lock();
delete _texture;
delete [] _tessellation;
_lock_data.unlock();
}
void WandererChunk::render(QGLWidget* widget)
{
_lock_data.lock();
if (_texture_changed)
{
_texture_changed = false;
if (_texture_id)
{
widget->deleteTexture(_texture_id);
}
// TODO Only do the scale if not power-of-two textures are unsupported by GPU
_texture_id = widget->bindTexture(_texture->scaled(_texture_current_size, _texture_current_size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
//_texture_id = widget->bindTexture(*_texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
else
{
glBindTexture(GL_TEXTURE_2D, _texture_id);
}
int tessellation_size = _tessellation_current_size;
double tsize = 1.0 / (double)_tessellation_max_size;
_lock_data.unlock();
if (tessellation_size == 0)
{
return;
}
int tessellation_inc = _tessellation_max_size / (double)tessellation_size;
for (int j = 0; j < _tessellation_max_size; j += tessellation_inc)
{
glBegin(GL_QUAD_STRIP);
for (int i = 0; i <= _tessellation_max_size; i += tessellation_inc)
{
glTexCoord2d(tsize * (double)i, 1.0 - tsize * (double)j);
glVertex3d(_startx + _tessellation_step * (double)i, _tessellation[j * (_tessellation_max_size + 1) + i], _startz + _tessellation_step * (double)j);
glTexCoord2d(tsize * (double)i, 1.0 - tsize * (double)(j + tessellation_inc));
glVertex3d(_startx + _tessellation_step * (double)i, _tessellation[(j + tessellation_inc) * (_tessellation_max_size + 1) + i], _startz + _tessellation_step * (double)(j + tessellation_inc));
}
glEnd();
}
}
void WandererChunk::updatePriority(CameraDefinition* camera)
{
// Compute new priority
_lock_data.lock();
if (camera->location.x > _startx + _overall_step * 0.5)
{
_startx += _overall_step;
_restart_needed = true;
}
if (camera->location.z > _startz + _overall_step * 0.5)
{
_startz += _overall_step;
_restart_needed = true;
}
if (camera->location.x < _startx - _overall_step * 0.5)
{
_startx -= _overall_step;
_restart_needed = true;
}
if (camera->location.z < _startz - _overall_step * 0.5)
{
_startz -= _overall_step;
_restart_needed = true;
}
if (_restart_needed || _texture_current_size <= 1)
{
priority = 1000.0;
}
else if (_tessellation_current_size == _tessellation_max_size && _texture_current_size == _texture_max_size)
{
priority = -1000.0;
}
else
{
double distance, wanted_size;
Vector3 center;
center = getCenter();
distance = v3Norm(v3Sub(camera->location, center));
distance = distance < 0.1 ? 0.1 : distance;
wanted_size = (int)ceil(120.0 - distance / 3.0);
priority = wanted_size - _texture_current_size;
/*else if (distance < 30.0 && _texture_current_size < _texture_max_size / 8)
{
priority += 75.0;
}
else if (distance < 15.0 && _texture_current_size < _texture_max_size)
{
priority += 50.0;
}
else if (distance < 30.0 && _texture_current_size < _texture_max_size / 2)
{
priority += 25.0;
}*/
if (!cameraIsBoxInView(camera, center, _size, _size, 40.0))
{
priority -= 100.0;
}
}
_lock_data.unlock();
}
bool WandererChunk::maintain()
{
if (_restart_needed)
{
_restart_needed = false;
_lock_data.lock();
_texture_current_size = 0;
_tessellation_current_size = 0;
_lock_data.unlock();
}
if (_tessellation_current_size < _tessellation_max_size || _texture_current_size < _texture_max_size)
{
// Improve heightmap resolution
if (_tessellation_current_size < _tessellation_max_size)
{
int new_tessellation_size = _tessellation_current_size ? _tessellation_current_size * 4 : 2;
int old_tessellation_inc = _tessellation_current_size ? _tessellation_max_size / _tessellation_current_size : 1;
int new_tessellation_inc = _tessellation_max_size / new_tessellation_size;
for (int j = 0; j <= _tessellation_max_size; j += new_tessellation_inc)
{
for (int i = 0; i <= _tessellation_max_size; i += new_tessellation_inc)
{
if (_tessellation_current_size == 0 || i % old_tessellation_inc != 0 || j % old_tessellation_inc != 0)
{
double height = _renderer->getTerrainHeight(_renderer, _startx + _tessellation_step * (double)i, _startz + _tessellation_step * (double)j);
_tessellation[j * (_tessellation_max_size + 1) + i] = height;
}
}
}
_lock_data.lock();
_tessellation_current_size = new_tessellation_size;
_lock_data.unlock();
}
// Improve texture resolution
if (_texture_current_size < _texture_max_size)
{
int new_texture_size = _texture_current_size ? _texture_current_size * 2 : 1;
double step_size = _texture_current_size ? _size / (double)(new_texture_size) : 0.1;
//QImage* new_image = new QImage(new_texture_size, new_texture_size, QImage::Format_ARGB32);
QImage* new_image = new QImage(_texture->scaled(new_texture_size + 1, new_texture_size + 1, Qt::IgnoreAspectRatio, Qt::FastTransformation));
for (int j = 0; j <= new_texture_size; j++)
{
for (int i = 0; i <= new_texture_size; i++)
{
if (_texture_current_size <= 1 || i % 2 != 0 || j % 2 != 0)
{
Vector3 location = {_startx + step_size * (double)i, 0.0, _startz + step_size * (double)j};
Color color = _renderer->applyTextures(_renderer, location, step_size);
new_image->setPixel(i, j, colorTo32BitRGBA(&color));
}
}
}
_lock_data.lock();
delete _texture;
_texture = new_image;
_texture_current_size = new_texture_size;
_texture_changed = true;
_lock_data.unlock();
}
return true;
}
else
{
return false;
}
}
Vector3 WandererChunk::getCenter()
{
Vector3 result;
result.x = _startx + _size / 2.0;
result.y = 0.0;
result.z = _startz + _size / 2.0;
return result;
}