From 696c5e20a1da222d225e9212017ef1af644b8103 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 7 Feb 2021 18:20:52 +0200
Subject: [PATCH] Async load texture data directly into the pixel buffer

---
 source/texture2d.cpp | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/source/texture2d.cpp b/source/texture2d.cpp
index 1e8e3db8..0e76128c 100644
--- a/source/texture2d.cpp
+++ b/source/texture2d.cpp
@@ -1,6 +1,7 @@
 #include <msp/core/raii.h>
 #include <msp/gl/extensions/arb_direct_state_access.h>
 #include <msp/gl/extensions/arb_texture_storage.h>
+#include <msp/graphics/imageloader.h>
 #include "bindable.h"
 #include "buffer.h"
 #include "error.h"
@@ -21,6 +22,7 @@ private:
 	Buffer pixel_buffer;
 	char *mapped_address;
 	Graphics::Image image;
+	Graphics::ImageLoader *img_loader;
 	unsigned n_bytes;
 	int phase;
 
@@ -247,6 +249,7 @@ Texture2D::AsyncLoader::AsyncLoader(Texture2D &t, IO::Seekable &i):
 	io(i),
 	pixel_buffer(PIXEL_UNPACK_BUFFER),
 	mapped_address(0),
+	img_loader(Graphics::ImageLoader::open_io(io)),
 	phase(0)
 { }
 
@@ -254,6 +257,7 @@ Texture2D::AsyncLoader::~AsyncLoader()
 {
 	if(mapped_address)
 		pixel_buffer.unmap();
+	delete img_loader;
 }
 
 bool Texture2D::AsyncLoader::needs_sync() const
@@ -265,9 +269,7 @@ bool Texture2D::AsyncLoader::process()
 {
 	if(phase==0)
 	{
-		/* TODO Enhance the ImageLoader system so that the image can be loaded
-		directly to the buffer */
-		image.load_io(io);
+		image.load_headers(*img_loader);
 		n_bytes = image.get_stride()*image.get_height();
 	}
 	else if(phase==1)
@@ -276,10 +278,7 @@ bool Texture2D::AsyncLoader::process()
 		mapped_address = reinterpret_cast<char *>(pixel_buffer.map());
 	}
 	else if(phase==2)
-	{
-		const char *data = reinterpret_cast<const char *>(image.get_pixels());
-		copy(data, data+n_bytes, mapped_address);
-	}
+		image.load_into(*img_loader, mapped_address);
 	else if(phase==3)
 	{
 		Bind _bind_buf(pixel_buffer, PIXEL_UNPACK_BUFFER);
-- 
2.43.0