compositor: Support alpha for solid color surfaces

diff --git a/src/compositor.c b/src/compositor.c
index f9e1f23..60142d1 100644 (file)
--- a/src/compositor.c
+++ b/src/compositor.c
@@ -2156,9 +2156,10 @@ static const char texture_fragment_shader[] =
 static const char solid_fragment_shader[] =
        "precision mediump float;\n"
        "uniform vec4 color;\n"
+       "uniform float alpha;\n"
        "void main()\n"
        "{\n"
-       "   gl_FragColor = color\n;"
+       "   gl_FragColor = alpha * color\n;"
        "}\n";
 
 static int