/// <summary>
/// configures vertex color to the vertex component data using the sprite object.
/// </summary>
/// <param name="vertexData">target vertex component data</param>
/// <param name="obj">source sprite object</param>
/// <param name="startIndex">start index of the vertex component data</param>
private static void SetBufferColor(ref VertexPositionColorTexture[] vertexData,
PointSpriteObject obj, int startIndex)
{
for (int i = 0; i < 4; i++)
{
vertexData[startIndex + i].Color = obj.Color;
}
}
/// <summary>
/// gets a right down position of each sprite object.
/// </summary>
/// <param name="index">an index of sprite object</param>
/// <param name="vec">out vector</param>
public void GetRightBottom(int index, ref Vector3 vec)
{
if (pointSpriteList.Count <= index || 0 > index)
{
throw new ArgumentException("Invalid index.");
}
PointSpriteObject obj = pointSpriteList[index];
vec.X = obj.Center.X + (obj.Width * 0.5f);
vec.Y = obj.Center.Y + (obj.Height * 0.5f);
vec.Z = obj.Center.Z;
}
/// <summary>
/// configures texture coordinates to the vertex component data
/// using the sprite object.
/// </summary>
/// <param name="vertexData">target vertex component data</param>
/// <param name="obj">source sprite object</param>
/// <param name="startIndex">start index of the vertex component data</param>
/// <param name="space">3D render space</param>
private static void SetBufferTextureCoord(
ref VertexPositionColorTexture[] vertexData, PointSpriteObject obj,
int startIndex, RenderingSpace space)
{
float u1 = 0.0f, v1 = 0.0f, u2 = 0.0f, v2 = 0.0f;
// Differ Y axis of the 3D and 2D
bool flipY = (space == RenderingSpace.Screen ? !obj.FlipY : obj.FlipY);
if (obj.FlipX)
{
if (flipY)
{
u1 = obj.MaxUV.X;
v1 = obj.MaxUV.Y;
u2 = obj.MinUV.X;
v2 = obj.MinUV.Y;
}
else
{
u1 = obj.MaxUV.X;
v1 = obj.MinUV.Y;
u2 = obj.MinUV.X;
v2 = obj.MaxUV.Y;
}
}
else
{
if (flipY)
{
u1 = obj.MinUV.X;
v1 = obj.MaxUV.Y;
u2 = obj.MaxUV.X;
v2 = obj.MinUV.Y;
}
else
{
u1 = obj.MinUV.X;
v1 = obj.MinUV.Y;
u2 = obj.MaxUV.X;
v2 = obj.MaxUV.Y;
}
}
vertexData[startIndex + 0].TextureCoordinate = new Vector2(u1, v1);
vertexData[startIndex + 1].TextureCoordinate = new Vector2(u2, v1);
vertexData[startIndex + 2].TextureCoordinate = new Vector2(u2, v2);
vertexData[startIndex + 3].TextureCoordinate = new Vector2(u1, v2);
}
/// <summary>
/// configures a transformed matrix to the vertex component data
/// using the sprite object.
/// </summary>
/// <param name="vertexData">target vertex component data</param>
/// <param name="obj">source sprite object</param>
/// <param name="startIndex">start index of the vertex component data</param>
/// <param name="transformMatrix">transformed matrix</param>
/// <param name="space">3D render space</param>
private static void SetBufferPosition(
ref VertexPositionColorTexture[] vertexData, PointSpriteObject obj,
int startIndex, Matrix transformMatrix, RenderingSpace space)
{
float cx = obj.Width * 0.5f;
float cy = obj.Height * 0.5f;
switch (obj.Rotation)
{
case PointSpriteObject.RotationAngle.Angle0:
{
vertexData[startIndex + 0].Position =
new Vector3(-cx, -cy, 0.0f);
vertexData[startIndex + 1].Position =
new Vector3(+cx, -cy, 0.0f);
vertexData[startIndex + 2].Position =
new Vector3(+cx, +cy, 0.0f);
vertexData[startIndex + 3].Position =
new Vector3(-cx, +cy, 0.0f);
}
break;
case PointSpriteObject.RotationAngle.Angle90:
{
vertexData[startIndex + 0].Position =
new Vector3(+cx, -cy, 0.0f);
vertexData[startIndex + 1].Position =
new Vector3(+cx, +cy, 0.0f);
vertexData[startIndex + 2].Position =
new Vector3(-cx, +cy, 0.0f);
vertexData[startIndex + 3].Position =
new Vector3(-cx, -cy, 0.0f);
}
break;
case PointSpriteObject.RotationAngle.Angle180:
{
vertexData[startIndex + 0].Position =
new Vector3(+cx, +cy, 0.0f);
vertexData[startIndex + 1].Position =
new Vector3(-cx, +cy, 0.0f);
vertexData[startIndex + 2].Position =
new Vector3(-cx, -cy, 0.0f);
vertexData[startIndex + 3].Position =
new Vector3(+cx, -cy, 0.0f);
}
break;
case PointSpriteObject.RotationAngle.Angle270:
{
vertexData[startIndex + 0].Position =
new Vector3(-cx, +cy, 0.0f);
vertexData[startIndex + 1].Position =
new Vector3(-cx, -cy, 0.0f);
vertexData[startIndex + 2].Position =
new Vector3(+cx, -cy, 0.0f);
vertexData[startIndex + 3].Position =
new Vector3(+cx, +cy, 0.0f);
}
break;
}
for (int i = 0; i < 4; i++)
{
int arrayIndex = startIndex + i;
Vector3.TransformNormal(ref vertexData[arrayIndex].Position,
ref transformMatrix,
out vertexData[arrayIndex].Position);
vertexData[arrayIndex].Position += obj.Center;
if (space == RenderingSpace.Screen)
{
vertexData[arrayIndex].Position =
HelperMath.Make2DCoord(vertexData[arrayIndex].Position);
}
}
}
/// <summary>
/// updates the vertex data and draws
/// </summary>
/// <param name="renderTracer">render information</param>
protected override void OnDraw(RenderTracer renderTracer)
{
int objectCount = 0;
for (int i = 0; i < this.count; i++)
{
if (pointSpriteList[i].Enable == false)
{
continue;
}
objectCount++;
}
if (objectCount == 0)
{
return;
}
PrimitiveCount = objectCount * 2;
UpdateVertexCount = this.count * vertexStride;
this.alwaysUpdate = true;
// needs to update?
if (renderTracer.View != lastViewMatrix)
{
needToUpdate = true;
this.lastViewMatrix = renderTracer.View;
}
if (this.alwaysUpdate || needToUpdate)
{
int vertexOffset = 0;
int indexOffset = 0;
// calculates inverse view matrix.
Matrix transformMatrix =
Helper3D.Transpose(this.TransformedMatrix * renderTracer.View);
for (int i = 0; i < this.count; i++)
{
PointSpriteObject obj = pointSpriteList[i];
if (obj.Enable == false)
{
continue;
}
// updates vertex positions.
SetBufferPosition(ref vertexData, obj, vertexOffset,
transformMatrix, this.space);
// updates texture coordinates.
SetBufferTextureCoord(ref vertexData, obj,
vertexOffset, this.space);
// updates vertex colors.
SetBufferColor(ref vertexData, obj, vertexOffset);
indexData[indexOffset + 0] = (short)(vertexOffset + 0);
indexData[indexOffset + 1] = (short)(vertexOffset + 1);
indexData[indexOffset + 2] = (short)(vertexOffset + 2);
indexData[indexOffset + 3] = (short)(vertexOffset + 3);
indexData[indexOffset + 4] = (short)(vertexOffset + 0);
indexData[indexOffset + 5] = (short)(vertexOffset + 2);
vertexOffset += vertexStride;
indexOffset += indexStride;
}
if (userPrimitive == false)
{
// binds the vertex buffer.
BindVertexBuffer();
// binds the index buffer.
BindIndexBuffer();
}
if (needToUpdate)
{
needToUpdate = false;
}
}
// draws mesh
base.OnDraw(renderTracer);
}
