model_viewer: use premultiplied colors on clouds and atmospheric layers

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/contrib/model_viewer/src/globe.nit b/contrib/model_viewer/src/globe.nit
index a5a9a62..12c6ffc 100644 (file)
--- a/contrib/model_viewer/src/globe.nit
+++ b/contrib/model_viewer/src/globe.nit
@@ -91,10 +91,12 @@ class GlobeMaterial
        init surface do init(0, true, [1.0, 1.0, 1.0, 1.0])
 
        # Create and configure a material for the cloud layer
-       init clouds do init(4, false, [1.0, 1.0, 1.0, 0.5])
+       init clouds do init(4, false, [1.0*clouds_a, 1.0*clouds_a, 1.0*clouds_a, clouds_a])
+       private var clouds_a = 0.5
 
        # Create and configure a material for the visible atmosphere
-       init atmo do init(null, false, [0.0, 0.8, 1.0, 0.05])
+       init atmo do init(null, false, [0.0, 0.8*atmo_a, 1.0*atmo_a, atmo_a])
+       private var atmo_a = 0.05
 
        redef fun draw(actor, model)
        do
@@ -228,7 +230,6 @@ class GlobeProgram
                                s += 0.05 * texture2D(tex_displace, tex_coord).r;
 
                        gl_Position = (vec4(coord.xyz * s, 1.0) * rotation + translation) * mvp;
-
                }
                """ @ glsl_vertex_shader