Use larger texture mask

This prevents rendering artifacts (black lines) on Mac OS and possibly
Win32 near the edges of masked textures.

diff --git a/src/objects/grits-tile.c b/src/objects/grits-tile.c
index 61ed0228c56545d31cfdb57e17d0134ac853101f..2b89aea16b51caa15f1607973b43488d81638b96 100644 (file)
--- a/src/objects/grits-tile.c
+++ b/src/objects/grits-tile.c
@@ -34,6 +34,7 @@
 
 #include <config.h>
 #include <math.h>
+#include <string.h>
 #include "gtkgl.h"
 #include "grits-tile.h"
 
@@ -352,13 +353,15 @@ void grits_tile_free(GritsTile *root, GritsTileFreeFunc free_func, gpointer user
 /* Load texture mask so we can draw a texture to just a part of a triangle */
 static guint _grits_tile_load_mask(void)
 {
-       guint  tex;
-       guint8 byte = 0xff;
+       guint tex;
+       const int width = 256, height = 256;
+       guint8 *bytes = g_malloc(width*height);
+       memset(bytes, 0xff, width*height);
        glGenTextures(1, &tex);
        glBindTexture(GL_TEXTURE_2D, tex);
 
-       glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 1, 1, 0,
-                       GL_ALPHA, GL_UNSIGNED_BYTE, &byte);
+       glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, width, height, 0,
+                       GL_ALPHA, GL_UNSIGNED_BYTE, bytes);
 
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);