From aaf0b6edbbda67c2414b4736b82a00e6fe4025f5 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Fri, 26 Nov 2021 09:00:38 +0100
Subject: Allow reloading images, textures and memory mapped files

---
 src/graphics/Font.cpp           |  6 ++++--
 src/graphics/Image.cpp          | 12 ++++++++----
 src/graphics/Shader.cpp         |  6 ++++--
 src/graphics/Texture.cpp        |  4 ++--
 src/system/MemoryMappedFile.cpp |  8 ++++++--
 5 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/src/graphics/Font.cpp b/src/graphics/Font.cpp
index 535daae..2efae40 100644
--- a/src/graphics/Font.cpp
+++ b/src/graphics/Font.cpp
@@ -13,8 +13,10 @@ namespace mgl {
     }
 
     bool Font::load_from_file(const MemoryMappedFile &mapped_file, unsigned int character_size) {
-        if(font.texture.id)
-            return false;
+        if(font.texture.id) {
+            mgl_font_unload(&font);
+            memset(&font, 0, sizeof(font));
+        }
         return mgl_font_load_from_file(&font, mapped_file.internal_mapped_file(), character_size) == 0;
     }
 
diff --git a/src/graphics/Image.cpp b/src/graphics/Image.cpp
index 74a9866..30cdb93 100644
--- a/src/graphics/Image.cpp
+++ b/src/graphics/Image.cpp
@@ -11,14 +11,18 @@ namespace mgl {
     }
 
     bool Image::load_from_file(const char *filepath) {
-        if(image.data)
-            return false;
+        if(image.data) {
+            mgl_image_unload(&image);
+            memset(&image, 0, sizeof(image));
+        }
         return mgl_image_load_from_file(&image, filepath) == 0;
     }
 
     bool Image::load_from_memory(const unsigned char *data, size_t size) {
-        if(image.data)
-            return false;
+        if(image.data) {
+            mgl_image_unload(&image);
+            memset(&image, 0, sizeof(image));
+        }
         return mgl_image_load_from_memory(&image, data, size) == 0;
     }
 
diff --git a/src/graphics/Shader.cpp b/src/graphics/Shader.cpp
index 0d0e651..2bdc9b2 100644
--- a/src/graphics/Shader.cpp
+++ b/src/graphics/Shader.cpp
@@ -10,8 +10,10 @@ namespace mgl {
     }
 
     bool Shader::load_from_file(const char *filepath, Type type) {
-        if(shader_program.id)
-            return false;
+        if(shader_program.id) {
+            mgl_shader_program_deinit(&shader_program);
+            shader_program.id = 0;
+        }
         
         int res = mgl_shader_program_init(&shader_program);
         if(res != 0)
diff --git a/src/graphics/Texture.cpp b/src/graphics/Texture.cpp
index 29c2eea..794c563 100644
--- a/src/graphics/Texture.cpp
+++ b/src/graphics/Texture.cpp
@@ -27,7 +27,7 @@ namespace mgl {
 
     bool Texture::load_from_file(const char *filepath, const LoadOptions load_options) {
         if(texture.id)
-            return false;
+            clear();
 
         if(mgl_texture_init(&texture) != 0)
             return false;
@@ -41,7 +41,7 @@ namespace mgl {
 
     bool Texture::load_from_image(Image &image, const LoadOptions load_options) {
         if(texture.id)
-            return false;
+            clear();
 
         if(mgl_texture_init(&texture) != 0)
             return false;
diff --git a/src/system/MemoryMappedFile.cpp b/src/system/MemoryMappedFile.cpp
index 54f15c1..c823cb5 100644
--- a/src/system/MemoryMappedFile.cpp
+++ b/src/system/MemoryMappedFile.cpp
@@ -12,8 +12,12 @@ namespace mgl {
     }
     
     bool MemoryMappedFile::load(const char *filepath, LoadOptions load_options) {
-        if(memory_mapped_file.fd != -1)
-            return false;
+        if(memory_mapped_file.fd != -1) {
+            mgl_mapped_file_unload(&memory_mapped_file);
+            memory_mapped_file.data = nullptr;
+            memory_mapped_file.size = 0;
+            memory_mapped_file.fd = -1;
+        }
 
         mgl_memory_mapped_file_load_options mapped_file_load_options = {
             load_options.readable,
-- 
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