void GetCorner_Cut(VertexInputData vertexInputData, ref VertexOutputData output)
{
Vector3 normal1 = cross(normalize(vertexInputData.position1 - vertexInputData.position2), new Vector3(0, 0, 1));
Vector3 normal2 = cross(normalize(vertexInputData.position3 - vertexInputData.position2), new Vector3(0, 0, 1));
Vector3 leftPoint = vertexInputData.position2 + normal1 * vertexInputData.strokeWidth2 * HALF;
Vector3 rightPoint = vertexInputData.position2 - normal1 * vertexInputData.strokeWidth2 * HALF;
Vector3 leftPoint2 = vertexInputData.position2 - normal2 * vertexInputData.strokeWidth2 * HALF;
Vector3 rightPoint2 = vertexInputData.position2 + normal2 * vertexInputData.strokeWidth2 * HALF;
if (vertexInputData.vertexId == 0)
{
output.position = leftPoint2;
}
else if (vertexInputData.vertexId == 1)
{
output.position = rightPoint2;
}
else if (vertexInputData.vertexId == 2)
{
output.position = rightPoint;
}
else if (vertexInputData.vertexId == 3)
{
output.position = leftPoint;
}
else
{
output.position = vertexInputData.position2;
}
}
public VertexOutputData VertexProgram(VertexInputData vertexData)
{
Profiler.BeginSample("Vertex Program");
VertexOutputData output = GetCornerVertexOutput(vertexData);
Profiler.EndSample();
return(output);
}
VertexOutputData GetCornerVertexOutputLocalSpace(VertexInputData vertexInputData)
{
Profiler.BeginSample("GetCornerVertexOutputLocalSpace");
VertexOutputData output = new VertexOutputData();
output.uv = vertexInputData.uv;
output.position = new Vector3(0, 0, 0);
output.color = GetColor(vertexInputData);
float cornerAngle = GetCornerAngle(vertexInputData.position1, vertexInputData.position2, vertexInputData.position3);
bool isLeftTurn = cornerAngle > PI;
if (cornerType == StrokeCornerType.Bevel)
{
GetCorner_Bevel(vertexInputData, ref output, cornerAngle, isLeftTurn);
}
else if (cornerType == StrokeCornerType.ExtendOrCut ||
cornerType == StrokeCornerType.ExtendOrMiter)
{
Vector3 cornerNormal = GetCornerNormal(vertexInputData.position1, vertexInputData.position2, vertexInputData.position3);
float cornerNormalLength;
if (abs(cornerAngle) > MIN_ANGLE_THRESHOLD)
{
cornerNormalLength = 1 / sin(cornerAngle * HALF);
}
else
{
cornerNormalLength = MAX_VALUE;
}
bool miterLimitReached = cornerNormalLength > _StrokeMiterLimit;
// do extend
if (miterLimitReached)
{
if (cornerType == StrokeCornerType.ExtendOrMiter)
{
GetCorner_Miter(vertexInputData, ref output, cornerNormal, cornerNormalLength, isLeftTurn);
}
else if (cornerType == StrokeCornerType.ExtendOrCut)
{
GetCorner_Cut(vertexInputData, ref output);
}
}
else
{
GetCorner_Extend(vertexInputData, ref output, cornerNormal, cornerNormalLength);
}
}
Profiler.EndSample();
return(output);
}
void GetCorner_Bevel(VertexInputData vertexInputData, ref VertexOutputData output, float cornerAngle, bool isLeftTurn)
{
Vector3 normal1 = cross(normalize(vertexInputData.position1 - vertexInputData.position2), new Vector3(0, 0, 1));
Vector3 normal2 = cross(normalize(vertexInputData.position3 - vertexInputData.position2), new Vector3(0, 0, 1));
Vector3 leftPoint = vertexInputData.position2 + normal1 * vertexInputData.strokeWidth2 * HALF;
Vector3 rightPoint = vertexInputData.position2 - normal1 * vertexInputData.strokeWidth2 * HALF;
Vector3 leftPoint2 = vertexInputData.position2 - normal2 * vertexInputData.strokeWidth2 * HALF;
Vector3 rightPoint2 = vertexInputData.position2 + normal2 * vertexInputData.strokeWidth2 * HALF;
if (vertexInputData.vertexId == 0 || vertexInputData.vertexId == 7)
{
output.position = leftPoint2;
}
else if (vertexInputData.vertexId == 1 || vertexInputData.vertexId == 6)
{
output.position = rightPoint2;
}
else if (vertexInputData.vertexId == 2 || vertexInputData.vertexId == 5)
{
output.position = rightPoint;
}
else if (vertexInputData.vertexId == 3 || vertexInputData.vertexId == 4)
{
output.position = leftPoint;
}
if (!isLeftTurn)
{
if (vertexInputData.vertexId == 5 || vertexInputData.vertexId == 6)
{
output.uv = new Vector2(vertexInputData.uv.x, 0.5f);
output.position = vertexInputData.position2;
}
}
else
{
if (vertexInputData.vertexId == 4 || vertexInputData.vertexId == 7)
{
output.uv = new Vector2(vertexInputData.uv.x, 0.5f);
output.position = vertexInputData.position2;
}
}
}
void GetCorner_Extend(VertexInputData vertexInputData, ref VertexOutputData output, Vector3 cornerNormal, float normalLength)
{
Vector3 leftPoint = vertexInputData.position2 - cornerNormal * normalLength * vertexInputData.strokeWidth2 * HALF;
Vector3 rightPoint = vertexInputData.position2 + cornerNormal * normalLength * vertexInputData.strokeWidth2 * HALF;
Vector3 leftPoint2 = leftPoint;
Vector3 rightPoint2 = rightPoint;
if (vertexInputData.vertexId == 0 || vertexInputData.vertexId == 7)
{
output.position = leftPoint2;
}
else if (vertexInputData.vertexId == 1 || vertexInputData.vertexId == 6)
{
output.position = rightPoint2;
}
else if (vertexInputData.vertexId == 2 || vertexInputData.vertexId == 5)
{
output.position = rightPoint;
}
else if (vertexInputData.vertexId == 3 || vertexInputData.vertexId == 4)
{
output.position = leftPoint;
}
}
VertexOutputData GetCornerVertexOutput(VertexInputData vertexInputData)
{
Profiler.BeginSample("GetCornerVertexOutput");
VertexOutputData output;
if (renderType == StrokeRenderType.ShapeSpace)
{
output = GetCornerVertexOutputLocalSpace(vertexInputData);
}
else if (
renderType == StrokeRenderType.ScreenSpacePixels ||
renderType == StrokeRenderType.ScreenSpaceRelativeToScreenHeight ||
renderType == StrokeRenderType.ShapeSpaceFacingCamera)
{
if (renderType == StrokeRenderType.ScreenSpacePixels)
{
float strokeWidthMulti = 1f / camera.pixelHeight;
vertexInputData.strokeWidth1 *= strokeWidthMulti;
vertexInputData.strokeWidth2 *= strokeWidthMulti;
vertexInputData.strokeWidth3 *= strokeWidthMulti;
}
// clip space -1 to 1
vertexInputData.strokeWidth1 *= 2;
vertexInputData.strokeWidth2 *= 2;
vertexInputData.strokeWidth3 *= 2;
if (renderType == StrokeRenderType.ShapeSpaceFacingCamera)
{
vertexInputData.position1 = MV.MultiplyPoint(vertexInputData.position1);
vertexInputData.position2 = MV.MultiplyPoint(vertexInputData.position2);
vertexInputData.position3 = MV.MultiplyPoint(vertexInputData.position3);
vertexInputData.strokeWidth1 /= -(vertexInputData.position1.z) + 1;
vertexInputData.strokeWidth2 /= -(vertexInputData.position2.z) + 1;
vertexInputData.strokeWidth3 /= -(vertexInputData.position3.z) + 1;
vertexInputData.position1 = P.MultiplyPoint(vertexInputData.position1);
vertexInputData.position2 = P.MultiplyPoint(vertexInputData.position2);
vertexInputData.position3 = P.MultiplyPoint(vertexInputData.position3);
}
else
{
vertexInputData.position1 = MVP.MultiplyPoint(vertexInputData.position1);
vertexInputData.position2 = MVP.MultiplyPoint(vertexInputData.position2);
vertexInputData.position3 = MVP.MultiplyPoint(vertexInputData.position3);
}
float z = vertexInputData.position2.z;
vertexInputData.position1.x *= camera.aspect;
vertexInputData.position2.x *= camera.aspect;
vertexInputData.position3.x *= camera.aspect;
//vertexInputData.position1.z = 0;
//vertexInputData.position2.z = 0;
//vertexInputData.position3.z = 0;
output = GetCornerVertexOutputLocalSpace(vertexInputData);
output.position.z = z;
output.position.x /= camera.aspect;
output.position = MVP.inverse.MultiplyPoint(output.position);
}
else
{
output = new VertexOutputData();
}
Profiler.EndSample();
return(output);
}
void GetCorner_Miter(VertexInputData vertexInputData, ref VertexOutputData output, Vector3 cornerNormal, float cornerNormalLength, bool isLeftTurn)
{
Vector3 strokeNormal = cross(normalize(vertexInputData.position2 - vertexInputData.position1), new Vector3(0, 0, 1));
float cornerNormalToStrokeNormalAngle = !isLeftTurn?GetCornerAngle(cornerNormal, new Vector3(0, 0, 0), strokeNormal) : GetCornerAngle(strokeNormal, new Vector3(0, 0, 0), cornerNormal);
// outside
float outsideNormalLength = _StrokeMiterLimit;
Vector3 outsideNormal = cornerNormal * outsideNormalLength;
// inside
float insideAngle = (PI * HALF) - cornerNormalToStrokeNormalAngle;
float insideNormalLength;
if (abs(insideAngle) > MIN_ANGLE_THRESHOLD)
{
insideNormalLength = 1 / sin(abs(insideAngle));
}
else
{
insideNormalLength = 0;
}
Vector3 insideNormal = -cornerNormal * insideNormalLength * vertexInputData.strokeWidth2 * HALF;
/*
* Vector3 projectedMax32 = Vector3.Project(vertexInputData.position3 - vertexInputData.position2, insideNormal);
* insideNormal = Vector3.ClampMagnitude(insideNormal, projectedMax32.magnitude);
* Vector3 projectedMax12 = Vector3.Project(vertexInputData.position1 - vertexInputData.position2, insideNormal);
* insideNormal = Vector3.ClampMagnitude(insideNormal, projectedMax12.magnitude);
*
* float proj23Sqr = (vertexInputData.position3 - vertexInputData.position2).sqrMagnitude + vertexInputData.strokeWidth2 * vertexInputData.strokeWidth2;
* float proj21Sqr = (vertexInputData.position1 - vertexInputData.position2).sqrMagnitude + vertexInputData.strokeWidth2 * vertexInputData.strokeWidth2;
* float insideNormalLengthSqr = insideNormalLength * insideNormalLength;
*
* if (insideNormalLengthSqr > proj23Sqr || insideNormalLengthSqr > proj21Sqr)
* {
* // special case, normal is longer than line to next or prev point
* if (proj21Sqr < proj23Sqr) {
* insideNormal = (vertexInputData.position1 - vertexInputData.position2);
* } else {
* insideNormal = (vertexInputData.position3 - vertexInputData.position2);
* }
* }*/
// miter fill
float miterFillLength = (1 - _StrokeMiterLimit * cos(cornerNormalToStrokeNormalAngle)) / sin(cornerNormalToStrokeNormalAngle);
Vector3 miterFillVector = cross(cornerNormal, new Vector3(0, 0, 1)) * -miterFillLength;
Vector3 leftPoint = vertexInputData.position2;
Vector3 leftPoint2 = vertexInputData.position2;
Vector3 rightPoint = vertexInputData.position2;
Vector3 rightPoint2 = vertexInputData.position2;
Vector3 outsideNormalMinusFillVector = (outsideNormal - miterFillVector) * vertexInputData.strokeWidth2 * HALF;
Vector3 outsideNormalPlusFillVector = (outsideNormal + miterFillVector) * vertexInputData.strokeWidth2 * HALF;
if (isLeftTurn)
{
leftPoint += insideNormal;
rightPoint += outsideNormalMinusFillVector;
leftPoint2 += insideNormal;
rightPoint2 += outsideNormalPlusFillVector;
}
else
{
leftPoint -= outsideNormalPlusFillVector;
rightPoint -= insideNormal;
leftPoint2 -= outsideNormalMinusFillVector;
rightPoint2 -= insideNormal;
}
if (vertexInputData.vertexId == 0 || vertexInputData.vertexId == 7)
{
output.position = leftPoint2;
}
else if (vertexInputData.vertexId == 1 || vertexInputData.vertexId == 6)
{
output.position = rightPoint2;
}
else if (vertexInputData.vertexId == 2 || vertexInputData.vertexId == 5)
{
output.position = rightPoint;
}
else if (vertexInputData.vertexId == 3 || vertexInputData.vertexId == 4)
{
output.position = leftPoint;
}
}
