Android: potentially work around a Qualcomm Adreno driver bug which prevented videos from being loaded into vram.

src/modules/graphics/opengl/Canvas.cpp

@@ -590,6 +590,15 @@ bool Canvas::isFormatSupported(PixelFormat format, bool readable)
 	return supported;
 }
 
+void Canvas::resetFormatSupport()
+{
+	for (int i = 0; i < (int)PIXELFORMAT_MAX_ENUM; i++)
+	{
+		checkedFormats[i].readable = false;
+		checkedFormats[i].nonreadable = false;
+	}
+}
+
 } // opengl
 } // graphics
 } // love

src/modules/graphics/opengl/Canvas.h

@@ -81,6 +81,7 @@ public:
 	static bool isMultiFormatMultiCanvasSupported();
 	static bool isFormatSupported(PixelFormat format, bool readable);
 	static bool isFormatSupported(PixelFormat format);
+	static void resetFormatSupport();
 
 private:
 

src/modules/graphics/opengl/Graphics.cpp

@@ -59,6 +59,7 @@ Graphics::Graphics()
 	, mainVAO(0)
 {
 	gl = OpenGL();
+	Canvas::resetFormatSupport();
 
 	auto window = getInstance<love::window::Window>(M_WINDOW);
 

src/modules/graphics/opengl/OpenGL.cpp

@@ -23,6 +23,7 @@
 #include "OpenGL.h"
 
 #include "Shader.h"
+#include "Canvas.h"
 #include "common/Exception.h"
 
 #include "graphics/Graphics.h"
@@ -264,6 +265,13 @@ void OpenGL::setupContext()
 	createDefaultTexture();
 
 	contextInitialized = true;
+
+#ifdef LOVE_ANDROID
+	// This can't be done in initContext with the rest of the bug checks because
+	// Canvas::isFormatSupported relies on state initialized here / after init.
+	if (GLAD_ES_VERSION_3_0 && !Canvas::isFormatSupported(PIXELFORMAT_R8))
+		bugs.brokenR8PixelFormat = true;
+#endif
 }
 
 void OpenGL::deInitContext()
@@ -1315,7 +1323,8 @@ OpenGL::TextureFormat OpenGL::convertPixelFormat(PixelFormat pixelformat, bool r
 	switch (pixelformat)
 	{
 	case PIXELFORMAT_R8:
-		if (GLAD_VERSION_3_0 || GLAD_ES_VERSION_3_0 || GLAD_ARB_texture_rg || GLAD_EXT_texture_rg)
+		if ((GLAD_VERSION_3_0 || GLAD_ES_VERSION_3_0 || GLAD_ARB_texture_rg || GLAD_EXT_texture_rg)
+			&& !gl.bugs.brokenR8PixelFormat)
 		{
 			f.internalformat = GL_R8;
 			f.externalformat = GL_RED;

src/modules/graphics/opengl/OpenGL.h

@@ -169,6 +169,14 @@ public:
 		 **/
 		bool texStorageBreaksSubImage;
 
+		/**
+		 * An Android device with an Adreno 630 (supposedly GLES3.2-capable)
+		 * fails with GL_INVALID_OPERATION in glTexImage2D if the image is
+		 * GL_R8, despite the GLES 3.0 spec mandating support for that format.
+		 * It's possible more Adreno GPUs / drivers are affected as well.
+		 **/
+		bool brokenR8PixelFormat;
+
 		/**
 		 * Other bugs which have workarounds that don't use conditional code at
 		 * the moment: