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Fixed bug #1026 Vittorio Giovara 2010-07-16 19:09:28 PDT i was reading SDL_renderer_gles and i noticed that every time we there is some gl call the gl state is modified with a couple of glEnableClientState()/glDisableClientState. While this is completely fine for desktops systems, this is a major performace kill on mobile devices, right where opengles is implemented. Normal practice in this case is to update the glstate once, keep it always the same and disable/enable other states only in very special occasions. On the web there's plenty of documentation (on the top of my head http://developer.apple.com/iphone/library/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/Performance/Performance.html#//apple_ref/doc/uid/TP40008793-CH105-SW5 ) and i personally tried this. I modified my code and got a 10 fps boost, then modified SDL_render_gles and shifted from 40 fps to 50 fps alone -- considering that i started from ~30fps i got an 80% performance increase with this technique. I have attached a dif of my changes, hope that it will be included in mainstream.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 19 Jan 2011 23:56:16 -0800
parents 3a95a2b93eb3
children 327f181542f1
line wrap: on
line source

LOCAL_PATH := $(call my-dir)

###########################
#
# SDL shared library
#
###########################

include $(CLEAR_VARS)

LOCAL_MODULE := SDL

LOCAL_C_INCLUDES := $(LOCAL_PATH)/include

LOCAL_SRC_FILES := src/SDL_android.cpp \
	$(subst $(LOCAL_PATH)/,, \
	$(wildcard $(LOCAL_PATH)/src/*.c) \
	$(wildcard $(LOCAL_PATH)/src/audio/*.c) \
	$(LOCAL_PATH)/src/atomic/SDL_atomic.c \
	$(LOCAL_PATH)/src/atomic/SDL_spinlock.c.arm \
	$(wildcard $(LOCAL_PATH)/src/cpuinfo/*.c) \
	$(wildcard $(LOCAL_PATH)/src/events/*.c) \
	$(wildcard $(LOCAL_PATH)/src/file/*.c) \
	$(wildcard $(LOCAL_PATH)/src/joystick/*.c) \
	$(wildcard $(LOCAL_PATH)/src/haptic/*.c) \
	$(wildcard $(LOCAL_PATH)/src/stdlib/*.c) \
	$(wildcard $(LOCAL_PATH)/src/thread/*.c) \
	$(wildcard $(LOCAL_PATH)/src/timer/*.c) \
	$(wildcard $(LOCAL_PATH)/src/video/*.c) \
	$(wildcard $(LOCAL_PATH)/src/power/*.c) \
	$(wildcard $(LOCAL_PATH)/src/audio/android/*.c) \
	$(wildcard $(LOCAL_PATH)/src/audio/dummy/*.c) \
	$(wildcard $(LOCAL_PATH)/src/video/android/*.c) \
	$(wildcard $(LOCAL_PATH)/src/joystick/android/*.c) \
	$(wildcard $(LOCAL_PATH)/src/haptic/dummy/*.c) \
	$(wildcard $(LOCAL_PATH)/src/thread/pthread/*.c) \
	$(wildcard $(LOCAL_PATH)/src/timer/unix/*.c) \
	$(wildcard $(LOCAL_PATH)/src/loadso/dlopen/*.c))

LOCAL_LDLIBS := -ldl -lGLESv1_CM -llog

include $(BUILD_SHARED_LIBRARY)