mesa: remove _mesa_get_tex_unit_err() and fix error handling

This helper was only called from _mesa_BindTextureUnit().  It's simpler
to just inline it.

The error check / code / message in the helper was incorrect.  It was
written for glBindTextures(), not glBindTextureUnit().  The correct
error for a bad texture unit number is GL_INVALID_VALUE.  The error
message now reports the unit number rather than a GL_TEXTUREi enum.

Fixes a failure in piglit's arb_direct_state_access-bind-texture-unit test.

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/src/mesa/main/texobj.c b/src/mesa/main/texobj.c
index d7654eb..105ec1e 100644
--- a/src/mesa/main/texobj.c
+++ b/src/mesa/main/texobj.c
@@ -1780,8 +1780,13 @@ _mesa_BindTextureUnit(GLuint unit, GLuint texture)
    struct gl_texture_object *texObj;
    struct gl_texture_unit *texUnit;
 
-   /* Get the texture unit (this is an array look-up) */
-   texUnit = _mesa_get_tex_unit_err(ctx, unit, "glBindTextureUnit");
+   if (unit >= _mesa_max_tex_unit(ctx)) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glBindTextureUnit(unit=%u)", unit);
+      return;
+   }
+
+   texUnit = _mesa_get_tex_unit(ctx, unit);
+   assert(texUnit);
    if (!texUnit) {
       return;
    }