gamnit: use premultiplied alpha

[nit.git] / lib / gamnit / depth / particles.nit

diff --git a/lib/gamnit/depth/particles.nit b/lib/gamnit/depth/particles.nit
index 3c40ac1..bfe3392 100644 (file)
--- a/lib/gamnit/depth/particles.nit
+++ b/lib/gamnit/depth/particles.nit
@@ -258,7 +258,6 @@ class ParticleProgram
                {
                        if (use_texture) {
                                gl_FragColor = texture2D(texture0, gl_PointCoord) * v_color;
-                               if (gl_FragColor.a <= 0.01) discard;
                        } else {
                                gl_FragColor = v_color;
                        }
@@ -301,7 +300,7 @@ class ExplosionProgram
                gl_Position = center * mvp;
                gl_PointSize = scale / gl_Position.z * pt;
 
-               if (pt > 0.8) v_color.a = (1.0-pt)/0.2;
+               if (pt > 0.8) v_color *= (1.0-pt)/0.2;
        """
 end
 
@@ -318,8 +317,8 @@ class SmokeProgram
                gl_PointSize = scale / gl_Position.z * (pt+0.1);
 
                if (pt < 0.1)
-                       v_color.a = pt / 0.1;
+                       v_color *= pt / 0.1;
                else
-                       v_color.a = 1.0 - pt*0.9;
+                       v_color *= 1.0 - pt*0.9;
        """
 end