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Contrail smooth&color fix

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This commit is contained in:
dnqbob
2021-01-26 07:59:49 +08:00
committed by abcdefg30
parent 5fcc049040
commit c968a2a902
1 changed files with 25 additions and 11 deletions
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36
OpenRA.Mods.Common/Graphics/ContrailRenderable.cs
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@@ -17,6 +17,8 @@ namespace OpenRA.Mods.Common.Graphics
{ {
public class ContrailRenderable : IRenderable, IFinalizedRenderable public class ContrailRenderable : IRenderable, IFinalizedRenderable
{ {
const int MaxSmoothLength = 4;
public int Length => trail.Length; public int Length => trail.Length;
readonly World world; readonly World world;
@@ -63,8 +65,10 @@ namespace OpenRA.Mods.Common.Graphics
public IFinalizedRenderable PrepareRender(WorldRenderer wr) { return this; } public IFinalizedRenderable PrepareRender(WorldRenderer wr) { return this; }
public void Render(WorldRenderer wr) public void Render(WorldRenderer wr)
{ {
// Need at least 4 points to smooth the contrail over // Note: The length of contrail is now actually the number of the points to draw the contrail
if (length - skip < 4) // and we require at least two points to draw a tail
var renderLength = length - skip;
if (renderLength <= 1)
return; return;
var screenWidth = wr.ScreenVector(new WVec(width, WDist.Zero, WDist.Zero))[0]; var screenWidth = wr.ScreenVector(new WVec(width, WDist.Zero, WDist.Zero))[0];
@@ -73,11 +77,26 @@ namespace OpenRA.Mods.Common.Graphics
// Start of the first line segment is the tail of the list - don't smooth it. // Start of the first line segment is the tail of the list - don't smooth it.
var curPos = trail[Index(next - skip - 1)]; var curPos = trail[Index(next - skip - 1)];
var curColor = color; var curColor = color;
for (var i = 0; i < length - skip - 4; i++)
for (var i = 1; i < renderLength; i++)
{ {
var j = next - skip - i - 2; var j = next - skip - 1 - i;
var nextPos = Average(trail[Index(j)], trail[Index(j - 1)], trail[Index(j - 2)], trail[Index(j - 3)]); var alpha = ((renderLength - i) * color.A + renderLength - 1) / renderLength;
var nextColor = Exts.ColorLerp(i * 1f / (length - 4), color, Color.Transparent); var nextColor = Color.FromArgb(alpha, color);
var nextX = 0L;
var nextY = 0L;
var nextZ = 0L;
var k = 0;
for (; k < renderLength - i && k < MaxSmoothLength; k++)
{
var prepos = trail[Index(j - k)];
nextX += prepos.X;
nextY += prepos.Y;
nextZ += prepos.Z;
}
var nextPos = new WPos((int)(nextX / k), (int)(nextY / k), (int)(nextZ / k));
if (!world.FogObscures(curPos) && !world.FogObscures(nextPos)) if (!world.FogObscures(curPos) && !world.FogObscures(nextPos))
wcr.DrawLine(wr.Screen3DPosition(curPos), wr.Screen3DPosition(nextPos), screenWidth, curColor, nextColor); wcr.DrawLine(wr.Screen3DPosition(curPos), wr.Screen3DPosition(nextPos), screenWidth, curColor, nextColor);
@@ -97,11 +116,6 @@ namespace OpenRA.Mods.Common.Graphics
return j < 0 ? j + trail.Length : j; return j < 0 ? j + trail.Length : j;
} }
static WPos Average(params WPos[] list)
{
return list.Average();
}
public void Update(WPos pos) public void Update(WPos pos)
{ {
trail[next] = pos; trail[next] = pos;