gamnit: use premultiplied alpha

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

diff --git a/lib/gamnit/flat.nit b/lib/gamnit/flat.nit
index 56fd402..f3043c3 100644 (file)
--- a/lib/gamnit/flat.nit
+++ b/lib/gamnit/flat.nit
@@ -430,7 +430,7 @@ redef class App
 
                # Enable blending
                gl.capabilities.blend.enable
-               glBlendFunc(gl_SRC_ALPHA, gl_ONE_MINUS_SRC_ALPHA)
+               glBlendFunc(gl_ONE, gl_ONE_MINUS_SRC_ALPHA)
 
                # Enable depth test
                gl.capabilities.depth_test.enable
@@ -695,7 +695,7 @@ private class Simple2dProgram
                        }
 
                        gl_Position = (vec4(c * scale, 1.0) * rotation() + translation)* mvp;
-                       v_color = color;
+                       v_color = vec4(color.rgb*color.a, color.a);
                }
                """ @ glsl_vertex_shader