new texture dirty flags

panda/src/dxgsg/dxGraphicsStateGuardian.cxx

@@ -3982,6 +3982,32 @@ apply_texture(TextureContext *tc) {
         return;  // tex already set (and possible problem in state-sorting?)
     }
 
+    // If the texture image has changed, or if its use of mipmaps has
+    // changed, we need to re-create the image.
+    int dirty = dtc->get_dirty_flags();
+    if ((dirty & (Texture::DF_image | Texture::DF_mipmap)) != 0) {
+      // If this is *only* because of a mipmap change, issue a
+      // warning--it is likely that this change is the result of an
+      // error or oversight.
+      if ((dirty & Texture::DF_image) == 0) {
+        dxgsg_cat.warning()
+          << "Texture " << *dtx->_texture << " has changed mipmap state.\n";
+      }
+
+      dtc->DeleteTexture();
+      if (dtc->CreateTexture(_d3dDevice,_cNumTexPixFmts,_pTexPixFmts) == NULL) {
+        // Oops, we can't re-create the texture for some reason.
+        dxgsg_cat.error()
+          << "Unable to re-create texture " << *dtx->_texture << endl;
+
+        release_texture(dtc);
+        enable_texturing(false);
+        return;
+      }
+    }
+
+    dtc->clear_dirty_flags();
+
     Texture *tex = tc->_texture;
     Texture::WrapMode wrapU,wrapV;
     wrapU=tex->get_wrapu();
@@ -4076,7 +4102,6 @@ apply_texture(TextureContext *tc) {
 
     // bugbug:  does this handle the case of untextured geometry?
     //          we dont see this bug cause we never mix textured/untextured
-
     _d3dDevice->SetTexture(0,dtc->_surface);
 
 #if 0