Expose tex clear funcs and fix more Metal issues with blended textures (

#408)

* expose tex cache delete

* add unregister blended texture method

* fix metal blended texture clearing

src/graphic/Fast3D/gfx_metal.cpp

@@ -654,10 +654,10 @@ void gfx_metal_end_frame(void) {
         fb.has_ended_encoding = false;
         fb.has_bounded_vertex_buffer = false;
         fb.has_bounded_fragment_buffer = false;
-        fb.last_bound_textures[0] = nullptr;
-        fb.last_bound_textures[1] = nullptr;
-        fb.last_bound_samplers[0] = nullptr;
-        fb.last_bound_samplers[1] = nullptr;
+        for (int i = 0; i < SHADER_MAX_TEXTURES; i++) {
+            fb.last_bound_textures[i] = nullptr;
+            fb.last_bound_samplers[i] = nullptr;
+        }
         fb.last_depth_test = -1;
         fb.last_depth_mask = -1;
         fb.last_zmode_decal = -1;

src/graphic/Fast3D/gfx_pc.cpp

@@ -570,7 +570,7 @@ static std::string gfx_get_base_texture_path(const std::string& path) {
     return path;
 }
 
-static void gfx_texture_cache_delete(const uint8_t* orig_addr) {
+void gfx_texture_cache_delete(const uint8_t* orig_addr) {
     while (gfx_texture_cache.map.bucket_count() > 0) {
         TextureCacheKey key = { orig_addr, { 0 }, 0, 0 }; // bucket index only depends on the address
         size_t bucket = gfx_texture_cache.map.bucket(key);
@@ -3341,3 +3341,11 @@ void gfx_register_blended_texture(const char* name, uint8_t* mask, uint8_t* repl
 
     masked_textures[name] = MaskedTextureEntry{ mask, replacement };
 }
+
+void gfx_unregister_blended_texture(const char* name) {
+    if (gfx_check_image_signature(name)) {
+        name += 7;
+    }
+
+    masked_textures.erase(name);
+}

src/graphic/Fast3D/gfx_pc.h

@@ -82,12 +82,14 @@ void gfx_run(Gfx* commands, const std::unordered_map<Mtx*, MtxF>& mtx_replacemen
 void gfx_end_frame(void);
 void gfx_set_target_fps(int);
 void gfx_set_maximum_frame_latency(int latency);
+void gfx_texture_cache_delete(const uint8_t* orig_addr);
 extern "C" void gfx_texture_cache_clear();
 extern "C" int gfx_create_framebuffer(uint32_t width, uint32_t height);
 void gfx_get_pixel_depth_prepare(float x, float y);
 uint16_t gfx_get_pixel_depth(float x, float y);
 void gfx_push_current_dir(char* path);
 int32_t gfx_check_image_signature(const char* imgData);
 void gfx_register_blended_texture(const char* name, uint8_t* mask, uint8_t* replacement = nullptr);
+void gfx_unregister_blended_texture(const char* name);
 
 #endif