//Perform per frame updates
void UpdateFrame()
{
window.Update();
camera.Update();
//Change object type
if(window.isKeyPressed(' '))
{
++objectType;
if(objectType==3)
objectType=0;
window.SetKeyReleased(' ');
}
//Change render path
if(window.isKeyPressed('1') && renderPath!=CHROMATIC_SINGLE && pathOneSupported)
{
renderPath=CHROMATIC_SINGLE;
InitChromaticSingleStates();
}
if(window.isKeyPressed('2') && renderPath!=SIMPLE_SINGLE)
{
renderPath=SIMPLE_SINGLE;
InitSimpleSingleStates();
}
if(window.isKeyPressed('3') && renderPath!=CHROMATIC_TWIN)
{
renderPath=CHROMATIC_TWIN;
//Set States every pass, as it is a 2 pass algorithm
}
}
//Perform per frame updates
void UpdateFrame()
{
window.Update();
camera.Update();
//Update the light's position
lightPosition+=lightMovement;
//reflect the velocity if necessary
if(lightPosition.x>0.9f || lightPosition.x<-0.9f)
lightMovement.x=-lightMovement.x;
if(lightPosition.y>0.9f || lightPosition.y<-0.9f)
lightMovement.y=-lightMovement.y;
if(lightPosition.z>0.9f || lightPosition.z<-0.9f)
lightMovement.z=-lightMovement.z;
if(window.isKeyPressed('1') && codePath!=TEXTURE_ATTEN)
{
codePath=TEXTURE_ATTEN;
SetTextureAttenStates();
}
if( window.isKeyPressed('2') && codePath!=PASS_THROUGH_ATTEN &&
NV_texture_shader_supported)
{
codePath=PASS_THROUGH_ATTEN;
SetPassThroughAttenStates();
}
if( window.isKeyPressed('3') && codePath!=TEXTURE_3D_ATTEN &&
EXT_texture3D_supported)
{
codePath=TEXTURE_3D_ATTEN;
SetTexture3DAttenStates();
}
if( window.isKeyPressed('4') && codePath!=GAUSSIAN_ATTEN)
{
codePath=GAUSSIAN_ATTEN;
SetGaussianAttenStates();
}
if( window.isKeyPressed(' '))
{
currentLightColor++;
if(currentLightColor==4)
currentLightColor=0;
window.SetKeyReleased(' ');
}
}
//Perform per frame updates
void UpdateFrame()
{
window.Update();
camera.Update();
//Change anisotropy level
if( window.isKeyPressed(VK_UP) && EXT_texture_filter_anisotropic_supported &&
currentAnisotropy<maxAnisotropy)
{
window.MakeCurrent();
currentAnisotropy*=2;
glBindTexture(GL_TEXTURE_2D, pbufferTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, currentAnisotropy);
window.SetKeyReleased(VK_UP);
}
if( window.isKeyPressed(VK_DOWN) && EXT_texture_filter_anisotropic_supported &&
currentAnisotropy>1)
{
window.MakeCurrent();
currentAnisotropy/=2;
glBindTexture(GL_TEXTURE_2D, pbufferTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, currentAnisotropy);
window.SetKeyReleased(VK_DOWN);
}
//toggle mipmaps
if( window.isKeyPressed('M') && useMipmapFilter==false && SGIS_generate_mipmap_supported)
{
window.MakeCurrent();
glBindTexture(GL_TEXTURE_2D, pbufferTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, true);
useMipmapFilter=true;
}
if( window.isKeyPressed('L') && useMipmapFilter==true && SGIS_generate_mipmap_supported)
{
window.MakeCurrent();
glBindTexture(GL_TEXTURE_2D, pbufferTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, false);
useMipmapFilter=false;
}
//Pause/unpause
if(window.isKeyPressed('P'))
timer.Pause();
if(window.isKeyPressed('U'))
timer.Unpause();
//Swap between scenes in the pbuffer
if(window.isKeyPressed('1') && drawTextured)
{
//Draw wire tori
drawTextured=false;
}
if(window.isKeyPressed('2') && !drawTextured)
{
//draw textured sphere
drawTextured=true;
}
}
//Perform per frame updates
void UpdateFrame()
{
window.Update();
//update balls' position
float c = 2.0f*(float)cos(timer.GetTime()/600);
metaballs[0].position.x=-4.0f*(float)cos(timer.GetTime()/700) - c;
metaballs[0].position.y=4.0f*(float)sin(timer.GetTime()/600) - c;
metaballs[1].position.x=5.0f*(float)sin(timer.GetTime()/400) + c;
metaballs[1].position.y=5.0f*(float)cos(timer.GetTime()/400) - c;
metaballs[2].position.x=-5.0f*(float)cos(timer.GetTime()/400) - 0.2f*(float)sin(timer.GetTime()/600);
metaballs[2].position.y=5.0f*(float)sin(timer.GetTime()/500) - 0.2f*(float)sin(timer.GetTime()/400);
//increase or decrease density
if(window.isKeyPressed(VK_UP) && gridSize<maxGridSize)
{
gridSize++;
cubeGrid.Init(gridSize);
}
if(window.isKeyPressed(VK_DOWN) && gridSize>minGridSize)
{
gridSize--;
cubeGrid.Init(gridSize);
}
//pause & unpause
if(window.isKeyPressed('P'))
{
timer.Pause();
}
if(window.isKeyPressed('U'))
{
timer.Unpause();
}
//clear the field
for(int i=0; i<cubeGrid.numVertices; i++)
{
cubeGrid.vertices[i].value=0.0f;
cubeGrid.vertices[i].normal.LoadZero();
}
//evaluate the scalar field at each point
VECTOR3D ballToPoint;
float squaredRadius;
VECTOR3D ballPosition;
float normalScale;
for(int i=0; i<numMetaballs; i++)
{
squaredRadius=metaballs[i].squaredRadius;
ballPosition=metaballs[i].position;
//VC++6 standard does not inline functions
//by inlining these maually, in this performance-critical area,
//almost a 100% increase in speed is found
for(int j=0; j<cubeGrid.numVertices; j++)
{
//ballToPoint=cubeGrid.vertices[j].position-ballPosition;
ballToPoint.x=cubeGrid.vertices[j].position.x-ballPosition.x;
ballToPoint.y=cubeGrid.vertices[j].position.y-ballPosition.y;
ballToPoint.z=cubeGrid.vertices[j].position.z-ballPosition.z;
//get squared distance from ball to point
//float squaredDistance=ballToPoint.GetSquaredLength();
float squaredDistance= ballToPoint.x*ballToPoint.x +
ballToPoint.y*ballToPoint.y +
ballToPoint.z*ballToPoint.z;
if(squaredDistance==0.0f)
squaredDistance=0.0001f;
//value = r^2/d^2
cubeGrid.vertices[j].value+=squaredRadius/squaredDistance;
//normal = (r^2 * v)/d^4
normalScale=squaredRadius/(squaredDistance*squaredDistance);
//cubeGrid.vertices[j].normal+=ballToPoint*normalScale;
cubeGrid.vertices[j].normal.x+=ballToPoint.x*normalScale;
cubeGrid.vertices[j].normal.y+=ballToPoint.y*normalScale;
cubeGrid.vertices[j].normal.z+=ballToPoint.z*normalScale;
}
}
//toggle wireframe
if(window.isKeyPressed('W'))
{
glPolygonMode(GL_FRONT, GL_LINE);
}
if(window.isKeyPressed('F'))
{
glPolygonMode(GL_FRONT, GL_FILL);
}
//Change color
if(window.isKeyPressed(VK_SPACE))
{
currentDiffuseColor++;
if(currentDiffuseColor==numDiffuseColors)
currentDiffuseColor=0;
glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuseColors[currentDiffuseColor]);
window.SetKeyReleased(VK_SPACE);
}
}