ebiten: create DrawTriangle version for TestImageFloatTranslate

[hajimehoshi]

Operating System

• Windows
• macOS
• Linux
• FreeBSD
• OpenBSD
• Android
• iOS
• Nintendo Switch
• PlayStation 5
• Xbox
• Web Browsers

What feature would you like to be added?

TestImageFloatTranslate was introduced for #1171 but only for DrawImage. Probably we need DrawTriangle version.

This would require position adjustment and degrade performance unfortunately. We need more time to determine whether we introduce it or not.

Why is this needed?

No response

[hajimehoshi]

Unfortunately, not doing the adjustment for DrawTriangles was intentional. See
99e777b

diff --git a/examples/vector/main.go b/examples/vector/main.go
index 0ec64d52d..b5c7c86f2 100644
--- a/examples/vector/main.go
+++ b/examples/vector/main.go
@@ -284,7 +284,7 @@ func (g *Game) drawWave(screen *ebiten.Image, counter int, aa bool, line bool) {
 
        if line {
                op := &vector.StrokeOptions{}
-               op.Width = 5
+               op.Width = 15
                op.LineJoin = vector.LineJoinRound
                g.vertices, g.indices = path.AppendVerticesAndIndicesForStroke(g.vertices[:0], g.indices[:0], op)
        } else {