[gegl/gsoc2009-gpu] Modify the gegl_gpu_texture_clear() tests to make sure that the texture is non-empty before clearing

[Jerson Michael Perpetua <jperpetua src gnome org>]

commit 4a97d846546873b1245a6bee29ed9b73507d6926
Author: Jerson Michael Perpetua <jersonperpetua gmail com>
Date:   Thu Aug 20 03:34:11 2009 +0800

    Modify the gegl_gpu_texture_clear() tests to make sure that the texture is non-empty before clearing it
    
    Modify the gegl_gpu_texture_clear() tests to make sure that the texture is
    non-empty before clearing it.  We shouldn't rely on the current undefined
    behaviour wherein a newly initialized texture isn't most likely cleared (i.e.
    initialized to zeroes).

 tests/test-gegl-gpu-texture-clear-subrect.c |   24 +++++++++++++++++++++++-
 tests/test-gegl-gpu-texture-clear.c         |   25 ++++++++++++++++++++++++-
 2 files changed, 47 insertions(+), 2 deletions(-)
---
diff --git a/tests/test-gegl-gpu-texture-clear-subrect.c b/tests/test-gegl-gpu-texture-clear-subrect.c
index dc2da5f..22b606a 100644
--- a/tests/test-gegl-gpu-texture-clear-subrect.c
+++ b/tests/test-gegl-gpu-texture-clear-subrect.c
@@ -73,7 +73,29 @@ main (gint    argc,
   components = g_new (gfloat, 4 * 50 * 50);
 
     {
-      gint cnt;
+      gint   cnt;
+      gfloat color[4];
+
+      color[0] = g_random_double ();
+      color[1] = g_random_double ();
+      color[2] = g_random_double ();
+      color[3] = g_random_double ();
+
+      for (cnt = 0; cnt < 50 * 50; cnt++)
+        {
+          gint index = cnt * 4;
+
+          components[index    ] = color[0];
+          components[index + 1] = color[1];
+          components[index + 2] = color[2];
+          components[index + 3] = color[3];
+        }
+
+      /* set texture to some solid color to make sure that we aren't clearing
+       * an empty texture (note: this assumes that gegl_gpu_texture_set()
+       * works as expected)
+       */
+      gegl_gpu_texture_set (texture, NULL, components, NULL);
 
       /* clear individual subregions */
       for (cnt = 0; cnt < ARRAY_SIZE (test_cases); cnt++)
diff --git a/tests/test-gegl-gpu-texture-clear.c b/tests/test-gegl-gpu-texture-clear.c
index 1399a27..6ac92d9 100644
--- a/tests/test-gegl-gpu-texture-clear.c
+++ b/tests/test-gegl-gpu-texture-clear.c
@@ -40,8 +40,31 @@ main (gint    argc,
   components = g_new (gfloat, 4 * 50 * 50);
 
     {
-      gint cnt;
+      gint   cnt;
+      gfloat color[4];
 
+      color[0] = g_random_double ();
+      color[1] = g_random_double ();
+      color[2] = g_random_double ();
+      color[3] = g_random_double ();
+
+      for (cnt = 0; cnt < 50 * 50; cnt++)
+        {
+          gint index = cnt * 4;
+
+          components[index    ] = color[0];
+          components[index + 1] = color[1];
+          components[index + 2] = color[2];
+          components[index + 3] = color[3];
+        }
+
+      /* set texture to some solid color to make sure that we aren't clearing
+       * an empty texture (note: this assumes that gegl_gpu_texture_set()
+       * works as expected)
+       */
+      gegl_gpu_texture_set   (texture, NULL, components, NULL);
+
+      /* clear whole texture */
       gegl_gpu_texture_clear (texture, NULL);
       gegl_gpu_texture_get   (texture, NULL, components, NULL);