fix resource packs and add support for texture packs

Signed-off-by: Ryan Cao <70191398+ryanccn@users.noreply.github.com>

launcher/minecraft/mod/ResourcePack.cpp

@@ -114,3 +114,8 @@ bool ResourcePack::applyFilter(QRegularExpression filter) const
 
     return Resource::applyFilter(filter);
 }
+
+bool ResourcePack::valid() const
+{
+    return m_pack_format != 0;
+}

launcher/minecraft/mod/ResourcePack.h

@@ -42,6 +42,8 @@ class ResourcePack : public Resource {
     /** Thread-safe. */
     void setImage(QImage new_image);
 
+    bool valid() const override;
+
     [[nodiscard]] auto compare(Resource const& other, SortType type) const -> std::pair<int, bool> override;
     [[nodiscard]] bool applyFilter(QRegularExpression filter) const override;
 

launcher/minecraft/mod/TexturePack.cpp

@@ -62,3 +62,8 @@ QPixmap TexturePack::image(QSize size)
     TexturePackUtils::process(*this);
     return image(size);
 }
+
+bool TexturePack::valid() const
+{
+    return m_description != nullptr;
+}

launcher/minecraft/mod/TexturePack.h

@@ -48,6 +48,8 @@ class TexturePack : public Resource {
     /** Thread-safe. */
     void setImage(QImage new_image);
 
+    bool valid() const override;
+
    protected:
     mutable QMutex m_data_lock;