I hyper-focued on refactoring again

- I put a cool-sounding "we are number one" remix on repeat and straight
  up grinded the entire repository to a better state until 03:09 AM. I
  guess I have something wrong in my brain that makes me do this shit

6 files changed, 229 insertions, 0 deletions

diff --git a/core/resource/CMakeLists.txt b/core/resource/CMakeLists.txt
new file mode 100644
index 0000000..ef2ffae
--- /dev/null
+++ b/core/resource/CMakeLists.txt
@@ -0,0 +1,6 @@
+target_sources(core PRIVATE
+    "${CMAKE_CURRENT_LIST_DIR}/binfile.cc"
+    "${CMAKE_CURRENT_LIST_DIR}/binfile.hh"
+    "${CMAKE_CURRENT_LIST_DIR}/image.cc"
+    "${CMAKE_CURRENT_LIST_DIR}/image.hh"
+    "${CMAKE_CURRENT_LIST_DIR}/resource.hh")
diff --git a/core/resource/binfile.cc b/core/resource/binfile.cc
new file mode 100644
index 0000000..e17db50
--- /dev/null
+++ b/core/resource/binfile.cc
@@ -0,0 +1,70 @@
+#include "core/pch.hh"
+
+#include "core/resource/binfile.hh"
+
+#include "core/resource/resource.hh"
+
+static emhash8::HashMap<std::string, resource_ptr<BinFile>> resource_map;
+
+template<>
+resource_ptr<BinFile> resource::load<BinFile>(const char* name, unsigned int flags)
+{
+    auto it = resource_map.find(name);
+
+    if(it != resource_map.cend()) {
+        // Return an existing resource
+        return it->second;
+    }
+
+    auto file = PHYSFS_openRead(name);
+
+    if(file == nullptr) {
+        spdlog::warn("resource: {}: {}", name, PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
+        return nullptr;
+    }
+
+    auto new_resource = std::make_shared<BinFile>();
+    new_resource->size = PHYSFS_fileLength(file);
+    new_resource->buffer = new std::byte[new_resource->size];
+
+    PHYSFS_readBytes(file, new_resource->buffer, new_resource->size);
+    PHYSFS_close(file);
+
+    return resource_map.insert_or_assign(name, new_resource).first->second;
+}
+
+template<>
+void resource::hard_cleanup<BinFile>(void)
+{
+    for(const auto& it : resource_map) {
+        if(it.second.use_count() > 1L) {
+            spdlog::warn("resource: zombie resource [BinFile] {} [use_count={}]", it.first, it.second.use_count());
+        } else {
+            spdlog::debug("resource: releasing [BinFile] {}", it.first);
+        }
+
+        delete[] it.second->buffer;
+    }
+
+    resource_map.clear();
+}
+
+template<>
+void resource::soft_cleanup<BinFile>(void)
+{
+    auto iter = resource_map.cbegin();
+
+    while(iter != resource_map.cend()) {
+        if(iter->second.use_count() == 1L) {
+            spdlog::debug("resource: releasing [BinFile] {}", iter->first);
+
+            delete[] iter->second->buffer;
+
+            iter = resource_map.erase(iter);
+
+            continue;
+        }
+
+        iter = std::next(iter);
+    }
+}
diff --git a/core/resource/binfile.hh b/core/resource/binfile.hh
new file mode 100644
index 0000000..6bb5e3d
--- /dev/null
+++ b/core/resource/binfile.hh
@@ -0,0 +1,10 @@
+#ifndef CORE_RESOURCE_BINFILE_HH
+#define CORE_RESOURCE_BINFILE_HH 1
+#pragma once
+
+struct BinFile final {
+    std::byte* buffer;
+    std::size_t size;
+};
+
+#endif // CORE_RESOURCE_BINFILE_HH
diff --git a/core/resource/image.cc b/core/resource/image.cc
new file mode 100644
index 0000000..1601703
--- /dev/null
+++ b/core/resource/image.cc
@@ -0,0 +1,112 @@
+#include "core/pch.hh"
+
+#include "core/resource/image.hh"
+
+#include "core/resource/resource.hh"
+
+static emhash8::HashMap<std::string, resource_ptr<Image>> resource_map;
+
+static int stbi_physfs_read(void* context, char* data, int size)
+{
+    return PHYSFS_readBytes(reinterpret_cast<PHYSFS_File*>(context), data, size);
+}
+
+static void stbi_physfs_skip(void* context, int count)
+{
+    auto file = reinterpret_cast<PHYSFS_File*>(context);
+    PHYSFS_seek(file, PHYSFS_tell(file) + count);
+}
+
+static int stbi_physfs_eof(void* context)
+{
+    return PHYSFS_eof(reinterpret_cast<PHYSFS_File*>(context));
+}
+
+template<>
+resource_ptr<Image> resource::load<Image>(const char* name, unsigned int flags)
+{
+    auto it = resource_map.find(name);
+
+    if(it != resource_map.cend()) {
+        // Return an existing resource
+        return it->second;
+    }
+
+    auto file = PHYSFS_openRead(name);
+
+    if(file == nullptr) {
+        spdlog::warn("resource: {}: {}", name, PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
+        return nullptr;
+    }
+
+    if(flags & IMAGE_LOAD_FLIP) {
+        stbi_set_flip_vertically_on_load(true);
+    } else {
+        stbi_set_flip_vertically_on_load(false);
+    }
+
+    stbi_io_callbacks callbacks;
+    callbacks.read = &stbi_physfs_read;
+    callbacks.skip = &stbi_physfs_skip;
+    callbacks.eof = &stbi_physfs_eof;
+
+    auto new_resource = std::make_shared<Image>();
+
+    if(flags & IMAGE_LOAD_GRAY) {
+        new_resource->pixels = stbi_load_from_callbacks(&callbacks, file, &new_resource->size.x, &new_resource->size.y, nullptr, STBI_grey);
+    } else {
+        new_resource->pixels = stbi_load_from_callbacks(
+            &callbacks, file, &new_resource->size.x, &new_resource->size.y, nullptr, STBI_rgb_alpha);
+    }
+
+    PHYSFS_close(file);
+
+    if(new_resource->pixels == nullptr) {
+        spdlog::warn("resource: {}: {}", name, stbi_failure_reason());
+        return nullptr;
+    }
+
+    if(new_resource->size.x <= 0 || new_resource->size.y <= 0) {
+        spdlog::warn("resource {}: invalid dimensions", name);
+        stbi_image_free(new_resource->pixels);
+        return nullptr;
+    }
+
+    return resource_map.insert_or_assign(name, new_resource).first->second;
+}
+
+template<>
+void resource::hard_cleanup<Image>(void)
+{
+    for(const auto& it : resource_map) {
+        if(it.second.use_count() > 1L) {
+            spdlog::warn("resource: zombie resource [Image] {} [use_count={}]", it.first, it.second.use_count());
+        } else {
+            spdlog::debug("resource: releasing [Image] {}", it.first);
+        }
+
+        stbi_image_free(it.second->pixels);
+    }
+
+    resource_map.clear();
+}
+
+template<>
+void resource::soft_cleanup<Image>(void)
+{
+    auto iter = resource_map.cbegin();
+
+    while(iter != resource_map.cend()) {
+        if(iter->second.use_count() == 1L) {
+            spdlog::debug("resource: releasing [Image] {}", iter->first);
+
+            stbi_image_free(iter->second->pixels);
+
+            iter = resource_map.erase(iter);
+
+            continue;
+        }
+
+        iter = std::next(iter);
+    }
+}
diff --git a/core/resource/image.hh b/core/resource/image.hh
new file mode 100644
index 0000000..13e912e
--- /dev/null
+++ b/core/resource/image.hh
@@ -0,0 +1,13 @@
+#ifndef CORE_RESOURCE_IMAGE_HH
+#define CORE_RESOURCE_IMAGE_HH 1
+#pragma once
+
+constexpr static unsigned int IMAGE_LOAD_GRAY = 0x0001U;
+constexpr static unsigned int IMAGE_LOAD_FLIP = 0x0002U;
+
+struct Image final {
+    stbi_uc* pixels;
+    glm::ivec2 size;
+};
+
+#endif // CORE_RESOURCE_IMAGE_HH
diff --git a/core/resource/resource.hh b/core/resource/resource.hh
new file mode 100644
index 0000000..4946ffa
--- /dev/null
+++ b/core/resource/resource.hh
@@ -0,0 +1,18 @@
+#ifndef CORE_RESOURCE_RESOURCE_HH
+#define CORE_RESOURCE_RESOURCE_HH 1
+#pragma once
+
+template<typename T>
+using resource_ptr = std::shared_ptr<const T>;
+
+namespace resource
+{
+template<typename T>
+resource_ptr<T> load(const char* name, unsigned int flags = 0U);
+template<typename T>
+void hard_cleanup(void);
+template<typename T>
+void soft_cleanup(void);
+} // namespace resource
+
+#endif // CORE_RESOURCE_RESOURCE_HH