virtual bool Start()
{
CInputTask::GetPtr()->AddInputEventListener(this);
CCameraTask::GetPtr()->SetPosition(CVector(0, 0, 2));
m_nPolygonMode = GL_FILL;
m_bHDR = true;
m_fExposure = 1.0f;
// ATI doesn't support rectangular textures in GLSL
m_bHDRSquare = !CVideoTask::GetPtr()->IsNVIDIA();
if(CVideoTask::GetPtr()->IsNVIDIA())
{
m_fb.Init(CVideoTask::GetPtr()->GetWidth(), CVideoTask::GetPtr()->GetHeight(), GL_FLOAT_RGBA16_NV);
if(m_fb.IsValid())
m_shHDR.Init("shaders/HDRVert.glsl", "shaders/HDRRectFrag.glsl");
}
else if(CVideoTask::GetPtr()->IsATI())
{
m_fb.Init(1024, 1024, GL_RGBA_FLOAT16_ATI);
if(m_fb.IsValid())
m_shHDR.Init("shaders/HDRVert.glsl", "shaders/HDRSquareFrag.glsl");
}
else
{
m_fb.Init(1024, 1024, GL_RGBA16F_ARB);
if(m_fb.IsValid())
m_shHDR.Init("shaders/HDRVert.glsl", "shaders/HDRSquareFrag.glsl");
}
return true;
}
virtual bool Start()
{
CInputTask::GetPtr()->AddInputEventListener(this);
CCameraTask::GetPtr()->SetPosition(CVector(0, 0, 25));
CCameraTask::GetPtr()->SetThrust(1.0f);
m_nPolygonMode = GL_FILL;
m_vLight = CVector(1000, 1000, 1000);
m_vLightDirection = m_vLight / m_vLight.Magnitude();
m_nSamples = 2; // Number of sample rays to use in integral equation
m_Kr = 0.0025f; // Rayleigh scattering constant
m_Kr4PI = m_Kr*4.0f*PI;
m_Km = 0.0015f; // Mie scattering constant
m_Km4PI = m_Km*4.0f*PI;
m_ESun = 15.0f; // Sun brightness constant
m_g = -0.95f; // The Mie phase asymmetry factor
m_fInnerRadius = 10.0f;
m_fOuterRadius = 10.25f;
m_fScale = 1 / (m_fOuterRadius - m_fInnerRadius);
m_fWavelength[0] = 0.650f; // 650 nm for red
m_fWavelength[1] = 0.570f; // 570 nm for green
m_fWavelength[2] = 0.475f; // 475 nm for blue
m_fWavelength4[0] = powf(m_fWavelength[0], 4.0f);
m_fWavelength4[1] = powf(m_fWavelength[1], 4.0f);
m_fWavelength4[2] = powf(m_fWavelength[2], 4.0f);
m_fRayleighScaleDepth = 0.25f;
m_fMieScaleDepth = 0.1f;
m_pbOpticalDepth.MakeOpticalDepthBuffer(m_fInnerRadius, m_fOuterRadius, m_fRayleighScaleDepth, m_fMieScaleDepth);
m_tOpticalDepth.Init(&m_pbOpticalDepth);
m_shSkyFromSpace.Init("shaders/SkyFromSpaceVert.glsl", "shaders/SkyFromSpaceFrag.glsl");
m_shSkyFromAtmosphere.Init("shaders/SkyFromAtmosphereVert.glsl", "shaders/SkyFromAtmosphereFrag.glsl");
m_shGroundFromSpace.Init("shaders/GroundFromSpaceVert.glsl", "shaders/GroundFromSpaceFrag.glsl");
m_shGroundFromAtmosphere.Init("shaders/GroundFromAtmosphereVert.glsl", "shaders/GroundFromAtmosphereFrag.glsl");
m_fExposure = 2.0f;
m_fb.Init(800, 600, GL_RGBA16F_ARB);
//m_fb.Init(800, 600, GL_RGBA8);
m_shHDR.Init("shaders/HDRVert.glsl", "shaders/HDRFrag.glsl");
m_bHDR = true;
return true;
}
virtual void Update()
{
PROFILE("CAppTask::Update()", 1);
if(m_bHDR && m_fb.IsValid())
{
m_fb.EnableFrameBuffer();
if(m_bHDRSquare)
glViewport(0, 0, 1024, 1024);
}
glClearColor(0.25f, 0.25f, 0.25f, 0.25f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPolygonMode(GL_FRONT, m_nPolygonMode);
CMatrix4 mModel = m_srtModel.BuildModelMatrix();
glPushMatrix();
glMultMatrixf(mModel);
glBegin(GL_TRIANGLES);
glColor3f(1.0f,0.0f,0.0f);
glVertex3f(0.0f, 1.0f, 0.0f);
glColor3f(0.0f,1.0f,0.0f);
glVertex3f(-1.0f,-1.0f, 0.0f);
glColor3f(0.0f,0.0f,1.0f);
glVertex3f(1.0f,-1.0f, 0.0f);
glEnd();
glPopMatrix();
glPolygonMode(GL_FRONT, GL_FILL);
if(m_bHDR && m_fb.IsValid())
{
m_fb.DisableFrameBuffer();
if(m_bHDRSquare)
glViewport(0, 0, CVideoTask::GetPtr()->GetWidth(), CVideoTask::GetPtr()->GetHeight());
CVideoTask::GetPtr()->GetFont().Begin();
m_fb.EnableTexture();
m_shHDR.Enable();
m_shHDR.SetUniformParameter1f("fExposure", m_fExposure);
m_shHDR.SetUniformParameter1i("s2Test", 0);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glBegin(GL_QUADS);
{
if(m_bHDRSquare)
{
glTexCoord2f(0, 0); glVertex2i(10, CVideoTask::GetPtr()->GetHeight()-10);
glTexCoord2f(1, 0); glVertex2i(CVideoTask::GetPtr()->GetWidth()-10, CVideoTask::GetPtr()->GetHeight()-10);
glTexCoord2f(1, 1); glVertex2i(CVideoTask::GetPtr()->GetWidth()-10, 10);
glTexCoord2f(0, 1); glVertex2i(10, 10);
}
else
{
glTexCoord2f(0, 0); glVertex2i(10, CVideoTask::GetPtr()->GetHeight()-10);
glTexCoord2f(CVideoTask::GetPtr()->GetWidth(), 0); glVertex2i(CVideoTask::GetPtr()->GetWidth()-10, CVideoTask::GetPtr()->GetHeight()-10);
glTexCoord2f(CVideoTask::GetPtr()->GetWidth(), CVideoTask::GetPtr()->GetHeight()); glVertex2i(CVideoTask::GetPtr()->GetWidth()-10, 10);
glTexCoord2f(0, CVideoTask::GetPtr()->GetHeight()); glVertex2i(10, 10);
}
}
glEnd();
m_shHDR.Disable();
m_fb.DisableTexture();
char szBuffer[256];
CVideoTask::GetPtr()->GetFont().SetPosition(0, 15);
sprintf(szBuffer, "Exposure (+/-): %-2.2f", m_fExposure);
CVideoTask::GetPtr()->GetFont().Print(szBuffer);
CVideoTask::GetPtr()->GetFont().End();
}
}
virtual void Stop()
{
m_shHDR.Cleanup();
m_fb.Cleanup();
CInputTask::GetPtr()->RemoveInputEventListener(this);
}
virtual void Update()
{
PROFILE("CAppTask::Update()", 1);
if(m_bHDR && m_fb.IsValid())
m_fb.EnableFrameBuffer();
// Cheap collision detection/response
CVector vCamera = CCameraTask::GetPtr()->GetPosition();
const float camMag = vCamera.Magnitude();
const float camMagSqr = vCamera.MagnitudeSquared();
if(camMag < m_fInnerRadius + 0.01f)
{
CVector N = vCamera / camMag;
CVector I = CCameraTask::GetPtr()->GetVelocity();
float fSpeed = I.Magnitude();
I /= fSpeed;
CVector R = N * (2.0f*(-I | N)) + I;
CCameraTask::GetPtr()->SetVelocity(R * fSpeed);
vCamera = N * (m_fInnerRadius + 0.01f);
CCameraTask::GetPtr()->SetPosition(vCamera);
}
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPolygonMode(GL_FRONT, m_nPolygonMode);
// Draw the groud sphere
CGLShaderObject *pGroundShader;
if(camMag >= m_fOuterRadius)
pGroundShader = &m_shGroundFromSpace;
else
pGroundShader = &m_shGroundFromAtmosphere;
pGroundShader->Enable();
pGroundShader->SetUniformParameter3f("v3CameraPos", vCamera.x, vCamera.y, vCamera.z);
pGroundShader->SetUniformParameter3f("v3LightPos", m_vLightDirection.x, m_vLightDirection.y, m_vLightDirection.z);
pGroundShader->SetUniformParameter3f("v3InvWavelength", 1/m_fWavelength4[0], 1/m_fWavelength4[1], 1/m_fWavelength4[2]);
pGroundShader->SetUniformParameter1f("fCameraHeight", camMag);
pGroundShader->SetUniformParameter1f("fCameraHeight2", camMagSqr);
pGroundShader->SetUniformParameter1f("fInnerRadius", m_fInnerRadius);
pGroundShader->SetUniformParameter1f("fInnerRadius2", m_fInnerRadius*m_fInnerRadius);
pGroundShader->SetUniformParameter1f("fOuterRadius", m_fOuterRadius);
pGroundShader->SetUniformParameter1f("fOuterRadius2", m_fOuterRadius*m_fOuterRadius);
pGroundShader->SetUniformParameter1f("fKrESun", m_Kr*m_ESun);
pGroundShader->SetUniformParameter1f("fKmESun", m_Km*m_ESun);
pGroundShader->SetUniformParameter1f("fKr4PI", m_Kr4PI);
pGroundShader->SetUniformParameter1f("fKm4PI", m_Km4PI);
pGroundShader->SetUniformParameter1f("fScale", 1.0f / (m_fOuterRadius - m_fInnerRadius));
pGroundShader->SetUniformParameter1f("fScaleDepth", m_fRayleighScaleDepth);
pGroundShader->SetUniformParameter1f("fScaleOverScaleDepth", (1.0f / (m_fOuterRadius - m_fInnerRadius)) / m_fRayleighScaleDepth);
pGroundShader->SetUniformParameter1f("g", m_g);
pGroundShader->SetUniformParameter1f("g2", m_g*m_g);
pGroundShader->SetUniformParameter1i("nSamples", m_nSamples);
pGroundShader->SetUniformParameter1f("fSamples", float(m_nSamples));
pGroundShader->SetUniformParameter1i("s2Test", 0);
GLUquadricObj *pSphere = gluNewQuadric();
//m_tEarth.Enable();
gluSphere(pSphere, m_fInnerRadius, 100, 50);
//m_tEarth.Disable();
gluDeleteQuadric(pSphere);
pGroundShader->Disable();
// Draw the sky sphere
CGLShaderObject *pSkyShader;
if(camMag >= m_fOuterRadius)
pSkyShader = &m_shSkyFromSpace;
else
pSkyShader = &m_shSkyFromAtmosphere;
pSkyShader->Enable();
pSkyShader->SetUniformParameter3f("v3CameraPos", vCamera.x, vCamera.y, vCamera.z);
pSkyShader->SetUniformParameter3f("v3LightPos", m_vLightDirection.x, m_vLightDirection.y, m_vLightDirection.z);
pSkyShader->SetUniformParameter3f("v3InvWavelength", 1/m_fWavelength4[0], 1/m_fWavelength4[1], 1/m_fWavelength4[2]);
pSkyShader->SetUniformParameter1f("fCameraHeight", camMag);
pSkyShader->SetUniformParameter1f("fCameraHeight2", camMagSqr);
pSkyShader->SetUniformParameter1f("fInnerRadius", m_fInnerRadius);
pSkyShader->SetUniformParameter1f("fInnerRadius2", m_fInnerRadius*m_fInnerRadius);
pSkyShader->SetUniformParameter1f("fOuterRadius", m_fOuterRadius);
pSkyShader->SetUniformParameter1f("fOuterRadius2", m_fOuterRadius*m_fOuterRadius);
pSkyShader->SetUniformParameter1f("fKrESun", m_Kr*m_ESun);
pSkyShader->SetUniformParameter1f("fKmESun", m_Km*m_ESun);
pSkyShader->SetUniformParameter1f("fKr4PI", m_Kr4PI);
pSkyShader->SetUniformParameter1f("fKm4PI", m_Km4PI);
pSkyShader->SetUniformParameter1f("fScale", 1.0f / (m_fOuterRadius - m_fInnerRadius));
pSkyShader->SetUniformParameter1f("fScaleDepth", m_fRayleighScaleDepth);
pSkyShader->SetUniformParameter1f("fScaleOverScaleDepth", (1.0f / (m_fOuterRadius - m_fInnerRadius)) / m_fRayleighScaleDepth);
pSkyShader->SetUniformParameter1f("g", m_g);
pSkyShader->SetUniformParameter1f("g2", m_g*m_g);
pSkyShader->SetUniformParameter1i("nSamples", m_nSamples);
pSkyShader->SetUniformParameter1f("fSamples", float(m_nSamples));
glFrontFace(GL_CW);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE);
pSphere = gluNewQuadric();
gluSphere(pSphere, m_fOuterRadius, 100, 100);
gluDeleteQuadric(pSphere);
glDisable(GL_BLEND);
glFrontFace(GL_CCW);
pSkyShader->Disable();
glPolygonMode(GL_FRONT, GL_FILL);
if(m_bHDR && m_fb.IsValid())
{
m_fb.DisableFrameBuffer();
CVideoTask::GetPtr()->GetFont().Begin();
m_fb.EnableTexture();
m_shHDR.Enable();
m_shHDR.SetUniformParameter1f("fExposure", m_fExposure);
m_shHDR.SetUniformParameter1i("s2Test", 0);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glBegin(GL_QUADS);
{
glTexCoord2f(0, 0); glVertex2i(0, 600);
glTexCoord2f(800, 0); glVertex2i(800, 600);
glTexCoord2f(800, 600); glVertex2i(800, 0);
glTexCoord2f(0, 600); glVertex2i(0, 0);
}
glEnd();
m_shHDR.Disable();
m_fb.DisableTexture();
CVideoTask::GetPtr()->GetFont().End();
}
glColor4ub(255, 255, 255, 255);
char szBuffer[256];
CFont &fFont = CVideoTask::GetPtr()->GetFont();
fFont.Begin();
fFont.SetPosition(0, 15);
sprintf(szBuffer, "Samples (+/-): %d", m_nSamples);
fFont.Print(szBuffer);
fFont.SetPosition(0, 30);
sprintf(szBuffer, "Kr (F5/Sh+F5): %-4.4f", m_Kr);
fFont.Print(szBuffer);
fFont.SetPosition(0, 45);
sprintf(szBuffer, "Km (F6/Sh+F6): %-4.4f", m_Km);
fFont.Print(szBuffer);
fFont.SetPosition(0, 60);
sprintf(szBuffer, "g (F7/Sh+F7): %-2.2f", m_g);
fFont.Print(szBuffer);
fFont.SetPosition(0, 75);
sprintf(szBuffer, "ESun (F8/Sh+F8): %-1.1f", m_ESun);
fFont.Print(szBuffer);
fFont.SetPosition(0, 90);
sprintf(szBuffer, "Red (F9/Sh+F9): %-3.3f", m_fWavelength[0]);
fFont.Print(szBuffer);
fFont.SetPosition(0, 105);
sprintf(szBuffer, "Green (F10/Sh+F10): %-3.3f", m_fWavelength[1]);
fFont.Print(szBuffer);
fFont.SetPosition(0, 120);
sprintf(szBuffer, "Blue (F11/Sh+F11): %-3.3f", m_fWavelength[2]);
fFont.Print(szBuffer);
fFont.End();
}
