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/* Copyright (C) 2009 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#include "precompiled.h"
#include <algorithm>
#include "LightControl.h"
using AtlasMessage::Shareable;
class LightSphere : public wxControl
{
public:
LightSphere(wxWindow* parent, const wxSize& size, LightControl* lightControl)
: wxControl(parent, wxID_ANY, wxDefaultPosition, size),
m_LightControl(lightControl)
{
}
void OnPaint(wxPaintEvent& WXUNUSED(event))
{
// Draw a lit 3D sphere:
int w = GetClientSize().GetWidth();
int h = GetClientSize().GetHeight();
float lx = sin(-theta)*cos(phi);
float ly = cos(-theta)*cos(phi);
float lz = sin(phi);
wxImage img (w, h);
unsigned char* imgData = img.GetData();
for (int y = 0; y < h; ++y)
{
for (int x = 0; x < w; ++x)
{
// Calculate normal vector of sphere (radius 1)
float nx = 2*x / (float)(w-1) - 1; // [-1, 1]
float ny = 2*y / (float)(h-1) - 1;
float nz2 = 1 - nx*nx - ny*ny;
if (nz2 >= 0.f)
{
float nz = sqrt(nz2);
// Get reflection vector (r) of camera vector (c) in n
float cx = 0;
float cy = 0;
float cz = 1; // (camera is infinitely far upwards)
float ndotc = nz;
float rx = -cx + nx*(2*ndotc);
float ry = -cy + ny*(2*ndotc);
float rz = -cz + nz*(2*ndotc);
float ndotl = nx*lx + ny*ly + nz*lz;
float rdotl = rx*lx + ry*ly + rz*lz;
int diffuse = (int)std::max(0.f, ndotl*128.f);
int specular = (int)std::min(255.f, 64.f*powf(std::max(0.f, rdotl), 16.f));
imgData[0] = std::min(64+diffuse+specular, 255);
imgData[1] = std::min(48+diffuse+specular, 255);
imgData[2] = std::min(48+diffuse+specular, 255);
}
else
{
imgData[0] = 0;
imgData[1] = 0;
imgData[2] = 0;
}
imgData += 3;
}
}
wxPaintDC dc(this);
#ifdef __WXMSW__
dc.DrawBitmap(wxBitmap(img, dc), 0, 0); // TODO: is this any better than the version below?
#else
dc.DrawBitmap(wxBitmap(img), 0, 0);
#endif
}
void OnMouse(wxMouseEvent& event)
{
if (event.LeftIsDown())
{
int x = event.GetX();
int y = event.GetY();
int w = GetClientSize().GetWidth();
int h = GetClientSize().GetHeight();
float mx = 2*x / (float)(w-1) - 1; // [-1, 1]
float my = 2*y / (float)(h-1) - 1;
float mz2 = 1 - mx*mx - my*my;
if (mz2 >= 0.f)
{
//float mz = sqrt(mz2);
//phi = asin(mz);
// ^^ That's giving the height of the sphere at that point, so it's
// matching the point the user clicked on - but that's quite inconvenient
// when you want to move the sun near the horizon. So just make up
// some formula that gives a slightly nicer-feeling result:
phi = asin(mz2*mz2);
theta = -atan2(mx, my);
}
else
{
theta = -atan2(mx, my);
phi = 0;
}
Refresh(false);
m_LightControl->NotifyOtherObservers();
}
}
float theta, phi;
LightControl* m_LightControl;
DECLARE_EVENT_TABLE();
};
BEGIN_EVENT_TABLE(LightSphere, wxControl)
EVT_PAINT(LightSphere::OnPaint)
EVT_MOTION(LightSphere::OnMouse)
EVT_LEFT_DOWN(LightSphere::OnMouse)
END_EVENT_TABLE()
LightControl::LightControl(wxWindow* parent, const wxSize& size, Observable<AtlasMessage::sEnvironmentSettings>& environment)
: wxPanel(parent), m_Environment(environment)
{
wxSizer* sizer = new wxBoxSizer(wxHORIZONTAL);
sizer->SetMinSize(size);
m_Sphere = new LightSphere(this, size, this);
m_Sphere->theta = environment.sunrotation;
m_Sphere->phi = environment.sunelevation;
sizer->Add(m_Sphere, wxSizerFlags().Expand().Proportion(1));
SetSizer(sizer);
m_Conn = environment.RegisterObserver(0, &LightControl::OnSettingsChange, this);
}
void LightControl::OnSettingsChange(const AtlasMessage::sEnvironmentSettings& settings)
{
m_Sphere->theta = settings.sunrotation;
m_Sphere->phi = settings.sunelevation;
m_Sphere->Refresh(false);
}
void LightControl::NotifyOtherObservers()
{
m_Environment.sunrotation = m_Sphere->theta;
m_Environment.sunelevation = m_Sphere->phi;
m_Environment.NotifyObserversExcept(m_Conn);
}
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