demos: added glsl/texaaline.c program and overhaul the Makefile
This commit is contained in:
Brian Paul
parent
3595732f28
commit
c0565e86b4
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@ -5,48 +5,69 @@ include $(TOP)/configs/current
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INCDIR = $(TOP)/include
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LIB_DEP = $(TOP)/$(LIB_DIR)/$(GL_LIB_NAME) $(TOP)/$(LIB_DIR)/$(GLU_LIB_NAME) $(TOP)/$(LIB_DIR)/$(GLUT_LIB_NAME)
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LIB_DEP = \
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$(TOP)/$(LIB_DIR)/$(GL_LIB_NAME) \
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$(TOP)/$(LIB_DIR)/$(GLU_LIB_NAME) \
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$(TOP)/$(LIB_DIR)/$(GLUT_LIB_NAME)
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LIBS = -L$(TOP)/$(LIB_DIR) -l$(GLUT_LIB) -l$(GLU_LIB) -l$(GL_LIB) $(APP_LIB_DEPS)
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PROGS = \
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array \
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bitmap \
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brick \
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bump \
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convolutions \
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deriv \
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identity \
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fragcoord \
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linktest \
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mandelbrot \
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multinoise \
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multitex \
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noise \
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noise2 \
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points \
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pointcoord \
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samplers \
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samplers_array \
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shadow_sampler \
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skinning \
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texdemo1 \
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toyball \
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twoside \
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trirast \
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vert-or-frag-only \
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vert-tex
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INCLUDE_DIRS = -I$(TOP)/progs/util
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DEMO_SOURCES = \
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array.c \
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bitmap.c \
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brick.c \
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bump.c \
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convolutions.c \
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deriv.c \
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fragcoord.c \
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identity.c \
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linktest.c \
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mandelbrot.c \
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multinoise.c \
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multitex.c \
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noise.c \
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noise2.c \
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pointcoord.c \
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points.c \
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samplers.c \
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shadow_sampler.c \
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skinning.c \
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texaaline.c \
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texdemo1.c \
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toyball.c \
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trirast.c \
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twoside.c \
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vert-or-frag-only.c \
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vert-tex.c
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UTIL_HEADERS = \
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extfuncs.h \
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shaderutil.h \
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readtex.h
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UTIL_SOURCES = \
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shaderutil.c \
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readtex.c
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UTIL_OBJS = $(UTIL_SOURCES:.c=.o)
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PROGS = $(DEMO_SOURCES:%.c=%)
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##### RULES #####
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.SUFFIXES:
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.SUFFIXES: .c
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# make .o file from .c file:
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.c.o:
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) $< -o $@
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# make executable from .c file:
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.c: $(LIB_DEP)
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) $< $(LIBS) -o $@
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# make executable from .o files
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.o:
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$(APP_CC) $(INCLUDES) $(CFLAGS) $(LDFLAGS) $< $(UTIL_OBJS) $(LIBS) -o $@
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##### TARGETS #####
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@ -54,202 +75,163 @@ PROGS = \
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default: $(PROGS)
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##### Extra dependencies
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extfuncs.h: $(TOP)/progs/util/extfuncs.h
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cp $< .
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readtex.c: $(TOP)/progs/util/readtex.c
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cp $< .
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readtex.h: $(TOP)/progs/util/readtex.h
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cp $< .
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readtex.o: readtex.c readtex.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) readtex.c
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shaderutil.c: $(TOP)/progs/util/shaderutil.c
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cp $< .
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shaderutil.h: $(TOP)/progs/util/shaderutil.h
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cp $< .
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shaderutil.o: shaderutil.c shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) shaderutil.c
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array.o: array.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) array.c
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array: array.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) array.o shaderutil.o $(LIBS) -o $@
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bitmap.o: bitmap.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) bitmap.c
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bitmap: bitmap.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) bitmap.o shaderutil.o $(LIBS) -o $@
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brick.o: brick.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) brick.c
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brick: brick.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) brick.o shaderutil.o $(LIBS) -o $@
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bump.o: bump.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) bump.c
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bump: bump.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) bump.o shaderutil.o $(LIBS) -o $@
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convolutions.o: convolutions.c readtex.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) convolutions.c
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convolutions: convolutions.o readtex.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) convolutions.o readtex.o $(LIBS) -o $@
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deriv.o: deriv.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) deriv.c
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deriv: deriv.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) deriv.o shaderutil.o $(LIBS) -o $@
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identity.o: identity.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) identity.c
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identity: identity.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) identity.o shaderutil.o $(LIBS) -o $@
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fragcoord.o: fragcoord.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) fragcoord.c
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fragcoord: fragcoord.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) fragcoord.o shaderutil.o $(LIBS) -o $@
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linktest.o: linktest.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) linktest.c
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linktest: linktest.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) linktest.o shaderutil.o $(LIBS) -o $@
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mandelbrot.o: mandelbrot.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) mandelbrot.c
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mandelbrot: mandelbrot.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) mandelbrot.o shaderutil.o $(LIBS) -o $@
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multitex.o: multitex.c extfuncs.h readtex.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) multitex.c
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multitex: multitex.o readtex.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) multitex.o readtex.o shaderutil.o $(LIBS) -o $@
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noise.o: noise.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) noise.c
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noise: noise.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) noise.o shaderutil.o $(LIBS) -o $@
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noise2.o: noise2.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) noise2.c
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noise2: noise2.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) noise2.o shaderutil.o $(LIBS) -o $@
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points.o: points.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) points.c
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points: points.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) points.o shaderutil.o $(LIBS) -o $@
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pointcoord.o: pointcoord.c readtex.h extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) pointcoord.c
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pointcoord: pointcoord.o readtex.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) pointcoord.o readtex.o shaderutil.o $(LIBS) -o $@
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samplers.o: samplers.c readtex.h extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) samplers.c
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samplers: samplers.o readtex.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) samplers.o readtex.o shaderutil.o $(LIBS) -o $@
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samplers_array.o: samplers.c readtex.h extfuncs.h shaderutil.h
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$(APP_CC) -c -DSAMPLERS_ARRAY -I$(INCDIR) $(CFLAGS) samplers.c -o samplers_array.o
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samplers_array: samplers_array.o readtex.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) samplers_array.o readtex.o shaderutil.o $(LIBS) -o $@
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skinning.o: skinning.c readtex.h extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) skinning.c
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skinning: skinning.o readtex.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) skinning.o readtex.o shaderutil.o $(LIBS) -o $@
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texdemo1.o: texdemo1.c readtex.h extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) texdemo1.c
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texdemo1: texdemo1.o readtex.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) texdemo1.o readtex.o shaderutil.o $(LIBS) -o $@
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toyball.o: toyball.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) toyball.c
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toyball: toyball.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) toyball.o shaderutil.o $(LIBS) -o $@
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twoside.o: twoside.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) twoside.c
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twoside: twoside.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) twoside.o shaderutil.o $(LIBS) -o $@
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trirast.o: trirast.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) trirast.c
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trirast: trirast.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) trirast.o shaderutil.o $(LIBS) -o $@
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vert-or-frag-only.o: vert-or-frag-only.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) vert-or-frag-only.c
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vert-or-frag-only: vert-or-frag-only.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) vert-or-frag-only.o shaderutil.o $(LIBS) -o $@
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vert-tex.o: vert-tex.c extfuncs.h shaderutil.h
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$(APP_CC) -c -I$(INCDIR) $(CFLAGS) vert-tex.c
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vert-tex: vert-tex.o shaderutil.o
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$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) vert-tex.o shaderutil.o $(LIBS) -o $@
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clean:
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-rm -f $(PROGS)
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-rm -f *.o *~
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-rm -f extfuncs.h
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-rm -f shaderutil.*
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##### Extra dependencies
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extfuncs.h:
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cp $(TOP)/progs/util/extfuncs.h .
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readtex.c:
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cp $(TOP)/progs/util/readtex.c .
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readtex.h:
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cp $(TOP)/progs/util/readtex.h .
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shaderutil.c:
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cp $(TOP)/progs/util/shaderutil.c .
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shaderutil.h:
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cp $(TOP)/progs/util/shaderutil.h .
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array.o: $(UTIL_HEADERS)
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array: array.o $(UTIL_OBJS)
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bitmap.o: $(UTIL_HEADERS)
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bitmap: bitmap.o $(UTIL_OBJS)
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brick.o: $(UTIL_HEADERS)
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brick: brick.o $(UTIL_OBJS)
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bump.o: $(UTIL_HEADERS)
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bump: bump.o $(UTIL_OBJS)
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convolutions.o: $(UTIL_HEADERS)
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convolutions: convolutions.o $(UTIL_OBJS)
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deriv.o: deriv.c $(UTIL_HEADERS)
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deriv: deriv.o $(UTIL_OBJS)
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identity.o: $(UTIL_HEADERS)
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identity: identity.o $(UTIL_OBJS)
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fragcoord.o: $(UTIL_HEADERS)
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fragcoord: fragcoord.o $(UTIL_OBJS)
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linktest.o: $(UTIL_HEADERS)
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linktest: linktest.o $(UTIL_OBJS)
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mandelbrot.o: $(UTIL_HEADERS)
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mandelbrot: mandelbrot.o $(UTIL_OBJS)
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multinoise.o: $(UTIL_HEADERS)
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multinoise: multinoise.o $(UTIL_OBJS)
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multitex.o: $(UTIL_HEADERS)
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multitex: multitex.o $(UTIL_OBJS)
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noise.o: $(UTIL_HEADERS)
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noise: noise.o $(UTIL_OBJS)
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noise2.o: $(UTIL_HEADERS)
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noise2: noise2.o $(UTIL_OBJS)
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points.o: $(UTIL_HEADERS)
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points: points.o $(UTIL_OBJS)
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pointcoord.o: $(UTIL_HEADERS)
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pointcoord: pointcoord.o $(UTIL_OBJS)
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samplers.o: $(UTIL_HEADERS)
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samplers: samplers.o $(UTIL_OBJS)
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samplers_array.o: $(UTIL_HEADERS)
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samplers_array: samplers_array.o $(UTIL_OBJS)
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shadow_sampler.o: $(UTIL_HEADERS)
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shadow_sampler: shadow_sampler.o $(UTIL_OBJS)
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skinning.o: $(UTIL_HEADERS)
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skinning: skinning.o $(UTIL_OBJS)
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texaaline.o: $(UTIL_HEADERS)
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texaaline: texaaline.o $(UTIL_OBJS)
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texdemo1.o: $(UTIL_HEADERS)
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texdemo1: texdemo1.o $(UTIL_OBJS)
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toyball.o: $(UTIL_HEADERS)
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toyball: toyball.o $(UTIL_OBJS)
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twoside.o: $(UTIL_HEADERS)
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twoside: twoside.o $(UTIL_OBJS)
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trirast.o: $(UTIL_HEADERS)
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trirast: trirast.o $(UTIL_OBJS)
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vert-or-frag-only.o: $(UTIL_HEADERS)
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vert-or-frag-only: vert-or-frag-only.o $(UTIL_OBJS)
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vert-tex.o: $(UTIL_HEADERS)
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vert-tex: vert-tex.o $(UTIL_OBJS)
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@ -0,0 +1,369 @@
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/**
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* AA lines with texture mapped quads
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*
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* Brian Paul
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* 9 Feb 2008
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*/
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#include <assert.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <GL/gl.h>
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#include <GL/glut.h>
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#include <GL/glext.h>
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#include "extfuncs.h"
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static GLint WinWidth = 300, WinHeight = 300;
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static GLint win = 0;
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static GLfloat Width = 8.;
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/*
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* Quad strip for line from v0 to v1:
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*
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1 3 5 7
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+---+---------------------+---+
|
||||
| |
|
||||
| *v0 v1* |
|
||||
| |
|
||||
+---+---------------------+---+
|
||||
0 2 4 6
|
||||
*/
|
||||
static void
|
||||
QuadLine(const GLfloat *v0, const GLfloat *v1, GLfloat width)
|
||||
{
|
||||
GLfloat dx = v1[0] - v0[0];
|
||||
GLfloat dy = v1[1] - v0[1];
|
||||
GLfloat len = sqrt(dx*dx + dy*dy);
|
||||
float dx0, dx1, dx2, dx3, dx4, dx5, dx6, dx7;
|
||||
float dy0, dy1, dy2, dy3, dy4, dy5, dy6, dy7;
|
||||
|
||||
dx /= len;
|
||||
dy /= len;
|
||||
|
||||
width *= 0.5; /* half width */
|
||||
dx = dx * (width + 0.0);
|
||||
dy = dy * (width + 0.0);
|
||||
|
||||
dx0 = -dx+dy; dy0 = -dy-dx;
|
||||
dx1 = -dx-dy; dy1 = -dy+dx;
|
||||
|
||||
dx2 = 0+dy; dy2 = -dx+0;
|
||||
dx3 = 0-dy; dy3 = +dx+0;
|
||||
|
||||
dx4 = 0+dy; dy4 = -dx+0;
|
||||
dx5 = 0-dy; dy5 = +dx+0;
|
||||
|
||||
dx6 = dx+dy; dy6 = dy-dx;
|
||||
dx7 = dx-dy; dy7 = dy+dx;
|
||||
|
||||
/*
|
||||
printf("dx, dy = %g, %g\n", dx, dy);
|
||||
printf(" dx0, dy0: %g, %g\n", dx0, dy0);
|
||||
printf(" dx1, dy1: %g, %g\n", dx1, dy1);
|
||||
printf(" dx2, dy2: %g, %g\n", dx2, dy2);
|
||||
printf(" dx3, dy3: %g, %g\n", dx3, dy3);
|
||||
*/
|
||||
|
||||
glBegin(GL_QUAD_STRIP);
|
||||
glTexCoord2f(0, 0);
|
||||
glVertex2f(v0[0] + dx0, v0[1] + dy0);
|
||||
glTexCoord2f(0, 1);
|
||||
glVertex2f(v0[0] + dx1, v0[1] + dy1);
|
||||
|
||||
glTexCoord2f(0.5, 0);
|
||||
glVertex2f(v0[0] + dx2, v0[1] + dy2);
|
||||
glTexCoord2f(0.5, 1);
|
||||
glVertex2f(v0[0] + dx3, v0[1] + dy3);
|
||||
|
||||
glTexCoord2f(0.5, 0);
|
||||
glVertex2f(v1[0] + dx2, v1[1] + dy2);
|
||||
glTexCoord2f(0.5, 1);
|
||||
glVertex2f(v1[0] + dx3, v1[1] + dy3);
|
||||
|
||||
glTexCoord2f(1, 0);
|
||||
glVertex2f(v1[0] + dx6, v1[1] + dy6);
|
||||
glTexCoord2f(1, 1);
|
||||
glVertex2f(v1[0] + dx7, v1[1] + dy7);
|
||||
glEnd();
|
||||
}
|
||||
|
||||
|
||||
static float Cos(float a)
|
||||
{
|
||||
return cos(a * M_PI / 180.);
|
||||
}
|
||||
|
||||
static float Sin(float a)
|
||||
{
|
||||
return sin(a * M_PI / 180.);
|
||||
}
|
||||
|
||||
static void
|
||||
Redisplay(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
glClear(GL_COLOR_BUFFER_BIT);
|
||||
|
||||
glColor3f(1, 1, 1);
|
||||
|
||||
glEnable(GL_BLEND);
|
||||
glEnable(GL_TEXTURE_2D);
|
||||
|
||||
for (i = 0; i < 360; i+=5) {
|
||||
float v0[2], v1[2];
|
||||
v0[0] = 150 + 40 * Cos(i);
|
||||
v0[1] = 150 + 40 * Sin(i);
|
||||
v1[0] = 150 + 130 * Cos(i);
|
||||
v1[1] = 150 + 130 * Sin(i);
|
||||
QuadLine(v0, v1, Width);
|
||||
}
|
||||
|
||||
{
|
||||
float v0[2], v1[2], x;
|
||||
for (x = 0; x < 1.0; x += 0.2) {
|
||||
v0[0] = 150 + x;
|
||||
v0[1] = 150 + x * 40 - 20;
|
||||
v1[0] = 150 + x + 5.0;
|
||||
v1[1] = 150 + x * 40 - 20;
|
||||
QuadLine(v0, v1, Width);
|
||||
}
|
||||
}
|
||||
|
||||
glDisable(GL_BLEND);
|
||||
glDisable(GL_TEXTURE_2D);
|
||||
|
||||
glutSwapBuffers();
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
Reshape(int width, int height)
|
||||
{
|
||||
glViewport(0, 0, width, height);
|
||||
glMatrixMode(GL_PROJECTION);
|
||||
glLoadIdentity();
|
||||
glOrtho(0, width, 0, height, -1, 1);
|
||||
glMatrixMode(GL_MODELVIEW);
|
||||
glLoadIdentity();
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
CleanUp(void)
|
||||
{
|
||||
glutDestroyWindow(win);
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
Key(unsigned char key, int x, int y)
|
||||
{
|
||||
(void) x;
|
||||
(void) y;
|
||||
|
||||
switch(key) {
|
||||
case 'w':
|
||||
Width -= 0.5;
|
||||
break;
|
||||
case 'W':
|
||||
Width += 0.5;
|
||||
break;
|
||||
case 27:
|
||||
CleanUp();
|
||||
exit(0);
|
||||
break;
|
||||
}
|
||||
#if 0
|
||||
if (Width < 3)
|
||||
Width = 3;
|
||||
#endif
|
||||
printf("Width = %g\n", Width);
|
||||
glutPostRedisplay();
|
||||
}
|
||||
|
||||
|
||||
static float
|
||||
ramp4(GLint i, GLint size)
|
||||
{
|
||||
float d;
|
||||
if (i < 4 ) {
|
||||
d = i / 4.0;
|
||||
}
|
||||
else if (i >= size - 5) {
|
||||
d = 1.0 - (i - (size - 5)) / 4.0;
|
||||
}
|
||||
else {
|
||||
d = 1.0;
|
||||
}
|
||||
return d;
|
||||
}
|
||||
|
||||
static float
|
||||
ramp2(GLint i, GLint size)
|
||||
{
|
||||
float d;
|
||||
if (i < 2 ) {
|
||||
d = i / 2.0;
|
||||
}
|
||||
else if (i >= size - 3) {
|
||||
d = 1.0 - (i - (size - 3)) / 2.0;
|
||||
}
|
||||
else {
|
||||
d = 1.0;
|
||||
}
|
||||
return d;
|
||||
}
|
||||
|
||||
static float
|
||||
ramp1(GLint i, GLint size)
|
||||
{
|
||||
float d;
|
||||
if (i == 0 || i == size-1) {
|
||||
d = 0.0;
|
||||
}
|
||||
else {
|
||||
d = 1.0;
|
||||
}
|
||||
return d;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Make an alpha texture for antialiasing lines.
|
||||
* Just a linear fall-off ramp for now.
|
||||
* Should have a number of different textures for different line widths.
|
||||
* Could try a bell-like-curve....
|
||||
*/
|
||||
static void
|
||||
MakeTexture(void)
|
||||
{
|
||||
#define SZ 8
|
||||
GLfloat tex[SZ][SZ]; /* alpha tex */
|
||||
int i, j;
|
||||
for (i = 0; i < SZ; i++) {
|
||||
for (j = 0; j < SZ; j++) {
|
||||
#if 0
|
||||
float k = (SZ-1) / 2.0;
|
||||
float dx = fabs(i - k) / k;
|
||||
float dy = fabs(j - k) / k;
|
||||
float d;
|
||||
|
||||
dx = 1.0 - dx;
|
||||
dy = 1.0 - dy;
|
||||
d = dx * dy;
|
||||
|
||||
#else
|
||||
float d = ramp1(i, SZ) * ramp1(j, SZ);
|
||||
printf("%d, %d: %g\n", i, j, d);
|
||||
#endif
|
||||
tex[i][j] = d;
|
||||
}
|
||||
}
|
||||
|
||||
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, SZ, SZ, 0, GL_ALPHA, GL_FLOAT, tex);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
||||
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
|
||||
#undef SZ
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
MakeMipmap(void)
|
||||
{
|
||||
#define SZ 64
|
||||
GLfloat tex[SZ][SZ]; /* alpha tex */
|
||||
int level;
|
||||
|
||||
glPixelStorei(GL_UNPACK_ROW_LENGTH, SZ);
|
||||
for (level = 0; level < 7; level++) {
|
||||
int sz = 1 << (6 - level);
|
||||
int i, j;
|
||||
for (i = 0; i < sz; i++) {
|
||||
for (j = 0; j < sz; j++) {
|
||||
if (level == 6)
|
||||
tex[i][j] = 1.0;
|
||||
else if (level == 5)
|
||||
tex[i][j] = 0.5;
|
||||
else
|
||||
tex[i][j] = ramp1(i, sz) * ramp1(j, sz);
|
||||
}
|
||||
}
|
||||
|
||||
glTexImage2D(GL_TEXTURE_2D, level, GL_ALPHA,
|
||||
sz, sz, 0, GL_ALPHA, GL_FLOAT, tex);
|
||||
}
|
||||
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
||||
//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, 4);
|
||||
////glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 5);
|
||||
|
||||
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
|
||||
#undef SZ
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
Init(void)
|
||||
{
|
||||
const char *version;
|
||||
|
||||
(void) MakeTexture;
|
||||
(void) ramp4;
|
||||
(void) ramp2;
|
||||
|
||||
version = (const char *) glGetString(GL_VERSION);
|
||||
if (version[0] != '2' || version[1] != '.') {
|
||||
printf("This program requires OpenGL 2.x, found %s\n", version);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
GetExtensionFuncs();
|
||||
|
||||
glClearColor(0.3f, 0.3f, 0.3f, 0.0f);
|
||||
|
||||
printf("GL_RENDERER = %s\n",(const char *) glGetString(GL_RENDERER));
|
||||
|
||||
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
|
||||
#if 0
|
||||
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
|
||||
#elif 0
|
||||
MakeTexture();
|
||||
#else
|
||||
MakeMipmap();
|
||||
#endif
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
ParseOptions(int argc, char *argv[])
|
||||
{
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
main(int argc, char *argv[])
|
||||
{
|
||||
glutInit(&argc, argv);
|
||||
glutInitWindowPosition( 0, 0);
|
||||
glutInitWindowSize(WinWidth, WinHeight);
|
||||
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
|
||||
win = glutCreateWindow(argv[0]);
|
||||
glutReshapeFunc(Reshape);
|
||||
glutKeyboardFunc(Key);
|
||||
glutDisplayFunc(Redisplay);
|
||||
ParseOptions(argc, argv);
|
||||
Init();
|
||||
glutMainLoop();
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue