lib/gamnit: intro `Sprite::tint`

[nit.git] / lib / gamnit / flat.nit

diff --git a/lib/gamnit/flat.nit b/lib/gamnit/flat.nit
index ab433bf..6f9dea4 100644 (file)
--- a/lib/gamnit/flat.nit
+++ b/lib/gamnit/flat.nit
@@ -59,7 +59,15 @@ class Sprite
        var scale = 1.0 is writable
 
        # Transparency applied to the texture on draw
-       var alpha = 1.0 is writable
+       fun alpha: Float do return tint[3]
+
+       # Transparency applied to the texture on draw
+       fun alpha=(value: Float) do tint[3] = value
+
+       # Tint applied to the texture on draw
+       #
+       # Require: `tint.length == 4`
+       var tint: Array[Float] = [1.0, 1.0, 1.0, 1.0] is writable
 
        private fun draw
        do
@@ -73,7 +81,7 @@ class Sprite
                simple_2d_program.scale.array_enabled = false
 
                simple_2d_program.translation.uniform(center.x, -center.y, center.z, 0.0)
-               simple_2d_program.color.uniform(1.0, 1.0, 1.0, alpha)
+               simple_2d_program.color.uniform(tint[0], tint[1], tint[2], tint[3])
                simple_2d_program.scale.uniform scale
 
                simple_2d_program.use_texture.uniform true