1 files changed, 67 insertions, 1 deletions

diff --git a/src/mesa/main/texobj.c b/src/mesa/main/texobj.c
index b63f747fe8..2082f945f1 100644
--- a/src/mesa/main/texobj.c
+++ b/src/mesa/main/texobj.c
@@ -281,7 +281,8 @@ valid_texture_object(const struct gl_texture_object *tex)
       _mesa_problem(NULL, "invalid reference to a deleted texture object");
       return GL_FALSE;
    default:
-      _mesa_problem(NULL, "invalid texture object Target value");
+      _mesa_problem(NULL, "invalid texture object Target 0x%x, Id = %u",
+                    tex->Target, tex->Name);
       return GL_FALSE;
    }
 }
@@ -662,6 +663,59 @@ _mesa_test_texobj_completeness( const GLcontext *ctx,
    }
 }
 
+
+/**
+ * Return pointer to a default/fallback texture.
+ * The texture is a 2D 8x8 RGBA texture with all texels = (0,0,0,1).
+ * That's the value a sampler should get when sampling from an
+ * incomplete texture.
+ */
+struct gl_texture_object *
+_mesa_get_fallback_texture(GLcontext *ctx)
+{
+   if (!ctx->Shared->FallbackTex) {
+      /* create fallback texture now */
+      static GLubyte texels[8 * 8][4];
+      struct gl_texture_object *texObj;
+      struct gl_texture_image *texImage;
+      GLuint i;
+
+      for (i = 0; i < 8 * 8; i++) {
+         texels[i][0] =
+         texels[i][1] =
+         texels[i][2] = 0x0;
+         texels[i][3] = 0xff;
+      }
+
+      /* create texture object */
+      texObj = ctx->Driver.NewTextureObject(ctx, 0, GL_TEXTURE_2D);
+      assert(texObj->RefCount == 1);
+      texObj->MinFilter = GL_NEAREST;
+      texObj->MagFilter = GL_NEAREST;
+
+      /* create level[0] texture image */
+      texImage = _mesa_get_tex_image(ctx, texObj, GL_TEXTURE_2D, 0);
+
+      /* init the image fields */
+      _mesa_init_teximage_fields(ctx, GL_TEXTURE_2D, texImage,
+                                    8, 8, 1, 0, GL_RGBA); 
+
+      /* set image data */
+      ctx->Driver.TexImage2D(ctx, GL_TEXTURE_2D, 0, GL_RGBA,
+                             8, 8, 0,
+                             GL_RGBA, GL_UNSIGNED_BYTE, texels,
+                             &ctx->DefaultPacking, texObj, texImage);
+
+      _mesa_test_texobj_completeness(ctx, texObj);
+      assert(texObj->_Complete);
+
+      ctx->Shared->FallbackTex = texObj;
+   }
+   return ctx->Shared->FallbackTex;
+}
+
+
+
 /*@}*/
 
 
@@ -891,6 +945,7 @@ _mesa_BindTexture( GLenum target, GLuint texName )
    struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
    struct gl_texture_object *newTexObj = NULL, *defaultTexObj = NULL;
    GLint targetIndex;
+   GLboolean early_out = GL_FALSE;
    ASSERT_OUTSIDE_BEGIN_END(ctx);
 
    if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
@@ -944,6 +999,17 @@ _mesa_BindTexture( GLenum target, GLuint texName )
 
    assert(valid_texture_object(newTexObj));
 
+   _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
+   if ((ctx->Shared->RefCount == 1)
+       && (newTexObj == texUnit->CurrentTex[targetIndex])) {
+      early_out = GL_TRUE;
+   }
+   _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
+
+   if (early_out) {
+      return;
+   }
+
    /* flush before changing binding */
    FLUSH_VERTICES(ctx, _NEW_TEXTURE);