public void updateCamera(ref Matrix4 rendererWorldMat, ref Vector3 cameraPosLocal)
{
var laserParams = _laser.parameters;
for (int i = 0; i < laserParams.numBeams; ++i)
{
var beam = _laser.beam(i);
var flashEmitter = _flashEmitters [i];
var smokeEmitter = _smokeEmitters [i];
// TODO need intersection location
if (beam.hitsAnObstacle)
{
var hitPosLocal = Vector3.Transform(beam.endPosWorld, rendererWorldMat.Inverted());
var towardsCamera = (cameraPosLocal - hitPosLocal).Normalized();
flashEmitter.center = hitPosLocal;
flashEmitter.up = towardsCamera;
flashEmitter.particlesPerEmissionMin = laserParams.flashParticlesPerEmissionMin;
flashEmitter.particlesPerEmissionMax = laserParams.flashParticlesPerEmissionMax;
smokeEmitter.center = hitPosLocal;
smokeEmitter.up = towardsCamera;
smokeEmitter.particlesPerEmissionMin = laserParams.flameSmokeParticlesPerEmissionMin;
smokeEmitter.particlesPerEmissionMax = laserParams.flameSmokeParticlesPerEmissionMax;
}
else
{
// no hit = no particle emissions
flashEmitter.particlesPerEmission = 0;
smokeEmitter.particlesPerEmission = 0;
}
}
_flamesSmokeColorEffector.colorMask = _laser.parameters.backgroundColor;
_flamesSmokeColorEffector.colorMask.A = _laser.envelopeIntensity;
_flashColorEffector.colorMask = _laser.parameters.overlayColor;
_flashColorEffector.colorMask.A = _laser.envelopeIntensity;
}
public override void Render(SSRenderConfig renderConfig)
{
var beam = _laser.beam(_beamId);
if (beam == null)
{
return;
}
base.Render(renderConfig);
// step: setup render settings
SSShaderProgram.DeactivateAll();
GL.ActiveTexture(TextureUnit.Texture0);
GL.Enable(EnableCap.Texture2D);
var laserParams = _laser.parameters;
var startView = Vector3.Transform(beam.startPosWorld, renderConfig.invCameraViewMatrix);
var endView = Vector3.Transform(beam.endPosWorld, renderConfig.invCameraViewMatrix);
var middleView = (startView + endView) / 2f;
// step: draw middle section:
Vector3 diff = endView - startView;
float diff_xy = diff.Xy.Length;
float phi = -(float)Math.Atan2(diff.Z, diff_xy);
float theta = (float)Math.Atan2(diff.Y, diff.X);
Matrix4 backgroundOrientMat = Matrix4.CreateRotationY(phi) * Matrix4.CreateRotationZ(theta);
Matrix4 middlePlacementMat = backgroundOrientMat * Matrix4.CreateTranslation(middleView);
//Matrix4 startPlacementMat = Matrix4.CreateTranslation (startView);
float laserLength = diff.Length;
float middleWidth = laserParams.middleBackgroundWidth * _laser.envelopeIntensity;
Vector3 cameraDir = Vector3.Transform(
-Vector3.UnitZ, _cameraScene.renderConfig.invCameraViewMatrix).Normalized();
float dot = Vector3.Dot(cameraDir, beam.directionWorld());
dot = Math.Max(dot, 0f);
float interferenceWidth = middleWidth * laserParams.middleInterferenceScale;
GL.Color4(1f, 1f, 1f, beam.periodicIntensity * beam.periodicIntensity);
_updateMiddleMesh(laserLength, middleWidth);
#if true
// stretched middle background sprite
if (middleBackgroundSprite != null)
{
GL.Material(MaterialFace.Front, MaterialParameter.Emission, laserParams.backgroundColor);
GL.BindTexture(TextureTarget.Texture2D, middleBackgroundSprite.TextureID);
foreach (var oriX in xOrientationPresets)
{
Matrix4 rotated = oriX * middlePlacementMat;
GL.LoadMatrix(ref rotated);
_middleMesh.renderMesh(renderConfig);
}
}
#endif
#if true
// stretched middle overlay sprite
if (middleOverlayTexture != null)
{
GL.Material(MaterialFace.Front, MaterialParameter.Emission, laserParams.overlayColor);
GL.BindTexture(TextureTarget.Texture2D, middleOverlayTexture.TextureID);
_middleMesh.renderMesh(renderConfig);
foreach (var oriX in xOrientationPresets)
{
Matrix4 rotated = oriX * middlePlacementMat;
GL.LoadMatrix(ref rotated);
_middleMesh.renderMesh(renderConfig);
}
}
#endif
#if true
// interference sprite with a moving U-coordinate offset
if (laserParams.middleInterferenceScale > 0f && interferenceTexture != null)
{
_updateInterfernenceVertices(laserLength, interferenceWidth);
GL.Material(MaterialFace.Front, MaterialParameter.Emission, laserParams.middleInterferenceColor);
//GL.BindTexture(TextureTarget.Texture2D, interferenceSprite.TextureID);
GL.BindTexture(TextureTarget.Texture2D, interferenceTexture.TextureID);
var scaleMat = Matrix4.CreateScale(laserLength + middleWidth / 2f, interferenceWidth, 1f);
foreach (var oriX in xOrientationPresets)
{
Matrix4 rotated = scaleMat * oriX * middlePlacementMat;
GL.LoadMatrix(ref rotated);
_interferenceMesh.renderMesh(renderConfig);
}
}
#endif
}
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);
}