python: Prefer PIPE_FORMAT_Z32_UNORM.

src/gallium/state_trackers/python/samples/gs.py

@@ -139,7 +139,7 @@ def test(dev):
         tex_usage=PIPE_TEXTURE_USAGE_RENDER_TARGET,
     ).get_surface()
     zbuf = dev.texture_create(
-        PIPE_FORMAT_Z16_UNORM,
+        PIPE_FORMAT_Z32_UNORM,
         width, height,
         tex_usage=PIPE_TEXTURE_USAGE_DEPTH_STENCIL,
     ).get_surface()

src/gallium/state_trackers/python/samples/tri.py

@@ -139,7 +139,7 @@ def test(dev):
         tex_usage=PIPE_TEXTURE_USAGE_RENDER_TARGET,
     ).get_surface()
     zbuf = dev.texture_create(
-        PIPE_FORMAT_Z16_UNORM, 
+        PIPE_FORMAT_Z32_UNORM,
         width, height,
         tex_usage=PIPE_TEXTURE_USAGE_DEPTH_STENCIL,
     ).get_surface()