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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 033c455bbe99
children 3e4086b3bcd2
line wrap: on
line source



CFLAGS  := -W -Wall -Wextra -g `sdl-config --cflags` -DSDL_NO_COMPAT
LDFLAGS := `sdl-config --libs`

# If it doesn't pick up defaults
#CFLAGS  := -D_GNU_SOURCE=1 -D_REENTRANT -I/usr/local/include/SDL
#LDFLAGS := -lm -ldl -lesd -lpthread

SRC         	:= testsdl.c \
						platform/platform.c \
						rwops/rwops.c \
						rwops/TestSupportRWops.c \
						rect/rect.c \
						surface/surface.c \
						render/render.c \
						audio/audio.c
COMMON_SRC     := SDL_at.c common/common.c
COMMON_INCLUDE := SDL_at.h

TESTS_ALL := testsdl \
	platform/platform \
	rwops/rwops \
	rect/rect \
	surface/surface \
	render/render \
	audio/audio


.PHONY: all clean test


all: $(TESTS_ALL)

test: all
	@./testsdl

testsdl: $(SRC) $(COMMON_SRC)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(SRC) $(COMMON_SRC)

platform/platform: platform/platform.c $(COMMON_INCLUDE) $(COMMON_SRC)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ platform/platform.c $(COMMON_SRC) -DTEST_STANDALONE

rwops/rwops: rwops/rwops.c $(COMMON_INCLUDE) $(COMMON_SRC)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ rwops/rwops.c $(COMMON_SRC) -DTEST_STANDALONE

rect/rect: rect/rect.c $(COMMON_INCLUDE) $(COMMON_SRC)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ rect/rect.c $(COMMON_SRC) -DTEST_STANDALONE

surface/surface: surface/surface.c $(COMMON_INCLUDE) $(COMMON_SRC)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ surface/surface.c $(COMMON_SRC) -DTEST_STANDALONE

render/render: render/render.c $(COMMON_INCLUDE) $(COMMON_SRC)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ render/render.c $(COMMON_SRC) -DTEST_STANDALONE

audio/audio: audio/audio.c $(COMMON_INCLUDE) $(COMMON_SRC)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ audio/audio.c $(COMMON_SRC) -DTEST_STANDALONE

clean:
	$(RM) $(TESTS_ALL)