Disable intermediary texture rendering on Linux by default (#279)

Makefile

@@ -21,20 +21,22 @@ REV := cp -f
 
 PREFIX ?= /usr
 BINDIR = $(PREFIX)/bin
+CFLAGS := $(MACHINE) -ftree-vectorize -std=gnu99 -Wno-strict-aliasing
+
 ifdef COMSPEC
+	# Compiling for Windows
 	RES_PATH := .
 	CFLAGS += -DRESOURCES_IN_BINARY_DIR
 	CONFIG_PATH := ~/.klystrack
 else
+	# Not compiling for Windows
 	RES_PATH = $(PREFIX)/lib/klystrack
 	CONFIG_PATH := ~/.klystrack
+	CFLAGS += -DCONFIG_DEFAULT_DISABLE_RENDER_TO_TEXTURE
 endif
 
-
 include klystron/common.mk
 
-CFLAGS := $(MACHINE) -ftree-vectorize -std=gnu99 -Wno-strict-aliasing
-
 ifdef COMSPEC
 	TARGET := $(TARGET).exe
 	ARCHIVE := $(ARCHIVE).zip

src/mused.c

@@ -232,6 +232,13 @@ void init(MusInstrument *instrument, MusPattern *pattern, MusSeqPattern sequence
 
 	mused.flags = MULTICHANNEL_PREVIEW|ANIMATE_CURSOR|EDIT_MODE|SHOW_LOGO|FOLLOW_PLAY_POSITION|
 		MULTIKEY_JAMMING|START_WITH_TEMPLATE|EDIT_SEQUENCE_DIGITS;
+
+	// Rendering to the intermediary texture is disabled by default on Linux systems
+	// as it causes flashing of screen
+#ifdef CONFIG_DEFAULT_DISABLE_RENDER_TO_TEXTURE
+	mused.flags |= DISABLE_RENDER_TO_TEXTURE;
+#endif
+
 	mused.visible_columns = VC_INSTRUMENT | VC_COMMAND;
 	mused.done = 0;
 	mused.octave = 4;