public void updateSprites(SInstancedSpriteData instanceData, ref RectangleF clientRect,
ref Vector3 cameraPos, ref Matrix4 camera3dView, ref Matrix4 camera3dProj)
{
var beam = _laser.beam(_beamId);
var ray = beam.rayWorld();
var laserParams = _laser.parameters;
var beamSrcInViewSpace = Vector3.Transform(beam.startPosWorld, camera3dView);
bool hideSprites = true;
Vector3 intersectPt3d;
if (beamSrcInViewSpace.Z < 0f)
{
Matrix4 cameraViewProjMat3d = camera3dView * camera3dProj;
// extract a near plane from the camera view projection matrix
// https://www.opengl.org/discussion_boards/showthread.php/159332-Extract-clip-planes-from-projection-matrix
SSPlane3d nearPlane = new SSPlane3d()
{
A = cameraViewProjMat3d.M14 + cameraViewProjMat3d.M13,
B = cameraViewProjMat3d.M24 + cameraViewProjMat3d.M23,
C = cameraViewProjMat3d.M34 + cameraViewProjMat3d.M33,
D = cameraViewProjMat3d.M44 + cameraViewProjMat3d.M43
};
if (nearPlane.intersects(ref ray, out intersectPt3d))
{
#if false
Console.WriteLine("camera at world pos = " + cameraPos);
Console.WriteLine("camera in screen pos = " + OpenTKHelper.WorldToScreen(
cameraPos, ref cameraViewProjMat3d, ref clientRect));
Console.WriteLine("screen hit at world pos = " + intersectPt3d);
#endif
float lengthToIntersectionSq =
(intersectPt3d - beam.startPosWorld).LengthSquared;
float beamLengthSq = beam.lengthSqWorld();
if (lengthToIntersectionSq < beamLengthSq)
{
hideSprites = false;
Vector2 drawScreenPos = OpenTKHelper.WorldToScreen(
intersectPt3d - ray.dir * 1f, ref cameraViewProjMat3d, ref clientRect);
//Console.WriteLine("screen hit at screen pos = " + drawScreenPos);
float intensity = _laser.envelopeIntensity * beam.periodicIntensity;
Vector2 drawScale
= new Vector2(laserParams.hitFlareSizeMaxPx * (float)Math.Exp(intensity));
for (int i = 0; i < _spriteSlotIdxs.Length; ++i)
{
int writeIdx = _spriteSlotIdxs [i];
instanceData.writePosition(writeIdx, drawScreenPos);
instanceData.writeComponentScale(writeIdx, drawScale);
instanceData.writeOrientationZ(writeIdx, intensity * 2f * (float)Math.PI);
}
Color4 backgroundColor = laserParams.backgroundColor;
backgroundColor.A = intensity;
instanceData.writeColor(_spriteSlotIdxs[(int)SpriteId.coronaBackground], backgroundColor);
Color4 overlayColor = laserParams.overlayColor;
//overlayColor.A = intensity / _laser.parameters.intensityEnvelope.sustainLevel;
overlayColor.A = Math.Min(intensity * 2f, 1f);
instanceData.writeColor(_spriteSlotIdxs[(int)SpriteId.coronaOverlay], overlayColor);
//System.Console.WriteLine("overlay.alpha == " + overlayColor.A);
Color4 ring1Color = laserParams.overlayColor;
//ring1Color.A = (float)Math.Pow(intensity, 5.0);
ring1Color.A = 0.1f * intensity;
instanceData.writeComponentScale(_spriteSlotIdxs[(int)SpriteId.ring1],
drawScale * (float)Math.Exp(intensity));
instanceData.writeColor(_spriteSlotIdxs[(int)SpriteId.ring1], ring1Color);
//instanceData.writeColor(_spriteSlotIdxs[(int)SpriteId.ring1], Color4.LimeGreen);
Color4 ring2Color = laserParams.backgroundColor;
//ring2Color.A = (float)Math.Pow(intensity, 10.0);
ring2Color.A = intensity * 0.1f;
instanceData.writeColor(_spriteSlotIdxs[(int)SpriteId.ring2], ring2Color);
//instanceData.writeColor(_spriteSlotIdxs[(int)SpriteId.ring2], Color4.Magenta);
}
}
}
if (hideSprites)
{
// hide sprites
for (int i = 0; i < _spriteSlotIdxs.Length; ++i)
{
instanceData.writeComponentScale(_spriteSlotIdxs[i], Vector2.Zero);
}
}
//System.Console.WriteLine("beam id " + _beamId + " hitting screen at xy " + hitPosOnScreen);
}
public void updateSprites(SInstancedSpriteData instanceData, ref RectangleF screenClientRect,
ref Vector3 cameraPos, ref Matrix4 camera3dView, ref Matrix4 camera3dProj)
{
float occDiskScreenAreaUsed = (float)_occDiskObj.OcclusionQueueryResult;
if (occDiskScreenAreaUsed <= 0f)
{
// hide all sprites
var nanVec = new Vector2(float.NaN);
instanceData.writePosition(_backgroundSpriteIdx, nanVec);
instanceData.writePosition(_overlaySpriteIdx, nanVec);
return;
}
var laserParams = _laser.parameters;
var beam = _laser.beam(_beamId);
float beamIntensity = _laser.envelopeIntensity * beam.periodicIntensity;
// position sprites at the beam start in screen space
Matrix4 camera3dViewProjMat = camera3dView * camera3dProj;
var beamStartScreen = OpenTKHelper.WorldToScreen(beam.startPosWorld,
ref camera3dViewProjMat, ref screenClientRect);
instanceData.writePosition(_backgroundSpriteIdx, beamStartScreen);
instanceData.writePosition(_overlaySpriteIdx, beamStartScreen);
// compute screen space needed to occupy the area where the start of the middle's crossbeam
// would be displayed
Matrix4 viewInverted = camera3dView.Inverted();
Vector3 viewRight = Vector3.Transform(Vector3.UnitX, viewInverted).Normalized();
Vector3 occRightMost = _occDiskObj.Pos + viewRight * laserParams.middleBackgroundWidth;
Vector2 occRightMostPt = OpenTKHelper.WorldToScreen(occRightMost,
ref camera3dViewProjMat, ref screenClientRect);
Vector2 occCenterPt = OpenTKHelper.WorldToScreen(_occDiskObj.Pos,
ref camera3dViewProjMat, ref screenClientRect);
float crossBeamRadiusScreenPx = Math.Abs(occRightMostPt.X - occCenterPt.X);
// write sprite size big enough to cover up the starting section of the cross beam (middle)
float scale = Math.Max(laserParams.emissionFlareScreenSizeMin, crossBeamRadiusScreenPx * 2.5f)
* beamIntensity;
instanceData.writeMasterScale(_backgroundSpriteIdx, scale * 1.2f);
instanceData.writeMasterScale(_overlaySpriteIdx, scale * 1f);
// add some variety to orientation to make the sprites look less static
instanceData.writeOrientationZ(_backgroundSpriteIdx, beamIntensity * 1f * (float)Math.PI);
instanceData.writeOrientationZ(_overlaySpriteIdx, beamIntensity * 1f * (float)Math.PI);
// color intensity: depends on the dot product between to-camera vector and beam direction;
// also depends on how of the occlusion disk area is visible
float maxScreenArea = (float)Math.PI
* laserParams.emissionOccDiskRadiusPx * laserParams.emissionOccDiskRadiusPx;
float occDiskAreaRatio = occDiskScreenAreaUsed / maxScreenArea;
//System.Console.WriteLine("occDiskAreaRatio = " + occDiskAreaRatio);
Vector3 toCamera = (cameraPos - beam.startPosWorld).Normalized();
float dot = Math.Max(0f, Vector3.Dot(toCamera, beam.directionWorld()));
//System.Console.WriteLine("dot = " + dot);
var alpha = occDiskAreaRatio * 1.2f * (float)Math.Pow(beamIntensity, 0.1) * (float)Math.Pow(dot, 0.1);
alpha = Math.Min(alpha, 1f);
// finish background color
var backgroundColor = laserParams.backgroundColor;
backgroundColor.A = alpha;
instanceData.writeColor(_backgroundSpriteIdx, backgroundColor);
// finish overlay color
var overlayColor = laserParams.overlayColor;
overlayColor.A = alpha;
instanceData.writeColor(_overlaySpriteIdx, overlayColor);
}
