From 6c2ded4cac1d421355059ca2db919c064978243a Mon Sep 17 00:00:00 2001
From: sfan5 <sfan5@live.de>
Date: Thu, 25 Jul 2019 00:11:30 +0200
Subject: [PATCH] Unify GLES support in gui scaling filter

---
 src/client/guiscalingfilter.cpp | 24 +++++++-------
 src/client/tile.cpp             | 57 +++++++++++++++++----------------
 src/client/tile.h               |  1 +
 3 files changed, 44 insertions(+), 38 deletions(-)

diff --git a/src/client/guiscalingfilter.cpp b/src/client/guiscalingfilter.cpp
index 3490c47e8..2ff57ab74 100644
--- a/src/client/guiscalingfilter.cpp
+++ b/src/client/guiscalingfilter.cpp
@@ -23,6 +23,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/numeric.h"
 #include <cstdio>
 #include "client/renderingengine.h"
+#include "client/tile.h" // hasNPotSupport()
 
 /* Maintain a static cache to store the images that correspond to textures
  * in a format that's manipulable by code.  Some platforms exhibit issues
@@ -113,17 +114,18 @@ video::ITexture *guiScalingResizeCached(video::IVideoDriver *driver,
 			(u32)destrect.getHeight()));
 	imageScaleNNAA(srcimg, srcrect, destimg);
 
-#ifdef __ANDROID__
-	// Android is very picky about textures being powers of 2, so expand
-	// the image dimensions to the next power of 2, if necessary, for
-	// that platform.
-	video::IImage *po2img = driver->createImage(src->getColorFormat(),
-			core::dimension2d<u32>(npot2((u32)destrect.getWidth()),
-			npot2((u32)destrect.getHeight())));
-	po2img->fill(video::SColor(0, 0, 0, 0));
-	destimg->copyTo(po2img);
-	destimg->drop();
-	destimg = po2img;
+#if ENABLE_GLES
+	// Some platforms are picky about textures being powers of 2, so expand
+	// the image dimensions to the next power of 2, if necessary.
+	if (!hasNPotSupport()) {
+		video::IImage *po2img = driver->createImage(src->getColorFormat(),
+				core::dimension2d<u32>(npot2((u32)destrect.getWidth()),
+				npot2((u32)destrect.getHeight())));
+		po2img->fill(video::SColor(0, 0, 0, 0));
+		destimg->copyTo(po2img);
+		destimg->drop();
+		destimg = po2img;
+	}
 #endif
 
 	// Convert the scaled image back into a texture.
diff --git a/src/client/tile.cpp b/src/client/tile.cpp
index 82f989d89..009237c51 100644
--- a/src/client/tile.cpp
+++ b/src/client/tile.cpp
@@ -995,12 +995,7 @@ video::IImage* TextureSource::generateImage(const std::string &name)
 }
 
 #if ENABLE_GLES
-/**
- * Check and align image to npot2 if required by hardware
- * @param image image to check for npot2 alignment
- * @param driver driver to use for image operations
- * @return image or copy of image aligned to npot2
- */
+
 
 static inline u16 get_GL_major_version()
 {
@@ -1008,47 +1003,55 @@ static inline u16 get_GL_major_version()
 	return (u16) (gl_version[0] - '0');
 }
 
-video::IImage * Align2Npot2(video::IImage * image,
-		video::IVideoDriver* driver)
-{
-	if (image == NULL) {
-		return image;
-	}
-
-	core::dimension2d<u32> dim = image->getDimension();
+/**
+ * Check if hardware requires npot2 aligned textures
+ * @return true if alignment NOT(!) requires, false otherwise
+ */
 
+bool hasNPotSupport()
+{
 	// Only GLES2 is trusted to correctly report npot support
-	// Note: we cache the boolean result. GL context will never change on Android.
-	static const bool hasNPotSupport = get_GL_major_version() > 1 &&
+	// Note: we cache the boolean result, the GL context will never change.
+	static const bool supported = get_GL_major_version() > 1 &&
 		glGetString(GL_EXTENSIONS) &&
 		strstr((char *)glGetString(GL_EXTENSIONS), "GL_OES_texture_npot");
+	return supported;
+}
 
-	if (hasNPotSupport)
+/**
+ * Check and align image to npot2 if required by hardware
+ * @param image image to check for npot2 alignment
+ * @param driver driver to use for image operations
+ * @return image or copy of image aligned to npot2
+ */
+
+video::IImage * Align2Npot2(video::IImage * image,
+		video::IVideoDriver* driver)
+{
+	if (image == NULL)
+		return image;
+
+	if (hasNPotSupport())
 		return image;
 
+	core::dimension2d<u32> dim = image->getDimension();
 	unsigned int height = npot2(dim.Height);
 	unsigned int width  = npot2(dim.Width);
 
-	if ((dim.Height == height) &&
-			(dim.Width == width)) {
+	if (dim.Height == height && dim.Width == width)
 		return image;
-	}
 
-	if (dim.Height > height) {
+	if (dim.Height > height)
 		height *= 2;
-	}
-
-	if (dim.Width > width) {
+	if (dim.Width > width)
 		width *= 2;
-	}
 
 	video::IImage *targetimage =
 			driver->createImage(video::ECF_A8R8G8B8,
 					core::dimension2d<u32>(width, height));
 
-	if (targetimage != NULL) {
+	if (targetimage != NULL)
 		image->copyToScaling(targetimage);
-	}
 	image->drop();
 	return targetimage;
 }
diff --git a/src/client/tile.h b/src/client/tile.h
index 3021e119d..3a3ec58a3 100644
--- a/src/client/tile.h
+++ b/src/client/tile.h
@@ -135,6 +135,7 @@ public:
 IWritableTextureSource *createTextureSource();
 
 #if ENABLE_GLES
+bool hasNPotSupport();
 video::IImage * Align2Npot2(video::IImage * image, irr::video::IVideoDriver* driver);
 #endif
 
-- 
2.25.1