From: Iago Toral Quiroga <itoral@igalia.com>
Date: Mon, 31 Mar 2014 08:04:00 +0000 (-0600)
Subject: mesa: Allow setting GL_TEXTURE_MAX_LEVEL to 0 with GL_TEXTURE_RECTANGLE.
X-Git-Tag: upstream/10.3~2823
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f5904b732efd6ad1ec8273ce3c72dbf38df7076c;p=platform%2Fupstream%2Fmesa.git

mesa: Allow setting GL_TEXTURE_MAX_LEVEL to 0 with GL_TEXTURE_RECTANGLE.

Currently, we raise an error when doing this which breaks a conformance
test from the OpenGL samples pack. Even if this is a bit silly it is not
an error.

From http://www.opengl.org/wiki/Rectangle_Texture:

"Rectangle textures contain exactly one image; they cannot have mipmaps.
Therefore, any texture parameters that depend on LODs are irrelevant
when used with rectangle textures; attempting to set these parameters to
any value other than 0 will result in an error."

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76496

Reviewed-by: Brian Paul <brianp@vmware.com>
---

diff --git a/src/mesa/main/texparam.c b/src/mesa/main/texparam.c
index bfb2e1b..40790ff 100644
--- a/src/mesa/main/texparam.c
+++ b/src/mesa/main/texparam.c
@@ -352,7 +352,8 @@ set_tex_parameteri(struct gl_context *ctx,
       if (texObj->MaxLevel == params[0])
          return GL_FALSE;
 
-      if (params[0] < 0 || texObj->Target == GL_TEXTURE_RECTANGLE_ARB) {
+      if (params[0] < 0 ||
+          (texObj->Target == GL_TEXTURE_RECTANGLE_ARB && params[0] > 0)) {
          _mesa_error(ctx, GL_INVALID_VALUE,
                      "glTexParameter(param=%d)", params[0]);
          return GL_FALSE;