From 93fa68debcd6e416a1b20f43077f7a79525aaecb Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 27 Oct 2016 10:59:34 +0300
Subject: [PATCH] Add a datafile statement to use an external image for a
 texture

It can be useful for non-2D textures which can't be loaded directly from
an image file by the resource collection.
---
 source/texture.cpp     | 10 ++++++++++
 source/texture.h       |  1 +
 source/texturecube.cpp | 11 +++++++++++
 source/texturecube.h   |  1 +
 4 files changed, 23 insertions(+)

diff --git a/source/texture.cpp b/source/texture.cpp
index bda29f05..97a73d9e 100644
--- a/source/texture.cpp
+++ b/source/texture.cpp
@@ -288,6 +288,7 @@ void Texture::Loader::init()
 	else
 		srgb = false;
 
+	add("external_image", &Loader::external_image);
 	add("filter", &Loader::filter);
 	add("max_anisotropy", &Loader::max_anisotropy);
 	add("generate_mipmap", &Loader::generate_mipmap);
@@ -300,6 +301,15 @@ void Texture::Loader::init()
 	add("wrap_t",     &Loader::wrap_t);
 }
 
+void Texture::Loader::external_image(const string &fn)
+{
+	Graphics::Image img;
+	RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
+	img.load_io(*io);
+
+	obj.image(img, srgb);
+}
+
 void Texture::Loader::filter(TextureFilter f)
 {
 	obj.set_filter(f);
diff --git a/source/texture.h b/source/texture.h
index 3e050db5..44e12657 100644
--- a/source/texture.h
+++ b/source/texture.h
@@ -81,6 +81,7 @@ protected:
 	private:
 		void init();
 
+		void external_image(const std::string &);
 		void filter(TextureFilter);
 		void generate_mipmap(bool);
 		void image_data(const std::string &);
diff --git a/source/texturecube.cpp b/source/texturecube.cpp
index 743eb986..3c6f23bd 100644
--- a/source/texturecube.cpp
+++ b/source/texturecube.cpp
@@ -1,3 +1,4 @@
+#include <msp/datafile/collection.h>
 #include <msp/gl/extensions/arb_texture_cube_map.h>
 #include <msp/io/memory.h>
 #include <msp/strings/format.h>
@@ -212,11 +213,21 @@ TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 
 void TextureCube::Loader::init()
 {
+	add("external_image", &Loader::external_image);
 	add("image_data", &Loader::image_data);
 	add("raw_data", &Loader::raw_data);
 	add("storage", &Loader::storage);
 }
 
+void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
+{
+	Graphics::Image img;
+	RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
+	img.load_io(*io);
+
+	obj.image(face, img, srgb);
+}
+
 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 {
 	Graphics::Image img;
diff --git a/source/texturecube.h b/source/texturecube.h
index 9adf0697..7510a716 100644
--- a/source/texturecube.h
+++ b/source/texturecube.h
@@ -42,6 +42,7 @@ public:
 	private:
 		void init();
 
+		void external_image(TextureCubeFace, const std::string &);
 		void image_data(TextureCubeFace, const std::string &);
 		void raw_data(TextureCubeFace, const std::string &);
 		void storage(PixelFormat, unsigned);
-- 
2.43.0