Clear Conus radar overlay textures

On Mac OS, the texture are not zeroed by default which causes artifacts
along the edges of the radar overlays.

AWeather relies on the edges of the texture to be zero and uses GL_CLAMP
to merge multiple overlapping textures together.

diff --git a/src/plugins/radar.c b/src/plugins/radar.c
index 8166e6630891c2fdd341b0468e2b2a57a398d1c1..9d39dd00a0d21c14ded71b2178201f41dd75a2ef 100644 (file)
--- a/src/plugins/radar.c
+++ b/src/plugins/radar.c
@@ -378,13 +378,14 @@ static void _conus_update_end_copy(GritsTile *tile, guchar *pixels)
                glGenTextures(1, tile->data);
        }
 
+       gchar *clear = g_malloc0(2048*2048*4);
        guint *tex = tile->data;
        glBindTexture(GL_TEXTURE_2D, *tex);
 
        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
        glPixelStorei(GL_PACK_ALIGNMENT, 1);
        glTexImage2D(GL_TEXTURE_2D, 0, 4, 2048, 2048, 0,
-                       GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+                       GL_RGBA, GL_UNSIGNED_BYTE, clear);
        glTexSubImage2D(GL_TEXTURE_2D, 0, 1,1, CONUS_WIDTH/2,CONUS_HEIGHT,
                        GL_RGBA, GL_UNSIGNED_BYTE, pixels);
        tile->coords.n = 1.0/(CONUS_WIDTH/2);
@@ -396,6 +397,7 @@ static void _conus_update_end_copy(GritsTile *tile, guchar *pixels)
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
        glFlush();
+       g_free(clear);
 }
 
 /* Split the pixbuf into east and west halves (with 2K sides)