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Add GPU example (procedural texture)
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‎graphics/gpu/proctex/Makefile‎

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#---------------------------------------------------------------------------------
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.SUFFIXES:
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#---------------------------------------------------------------------------------
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ifeq ($(strip $(DEVKITARM)),)
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$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
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endif
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TOPDIR ?= $(CURDIR)
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include $(DEVKITARM)/3ds_rules
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#---------------------------------------------------------------------------------
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# TARGET is the name of the output
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# BUILD is the directory where object files & intermediate files will be placed
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# SOURCES is a list of directories containing source code
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# DATA is a list of directories containing data files
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# INCLUDES is a list of directories containing header files
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#
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# NO_SMDH: if set to anything, no SMDH file is generated.
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# ROMFS is the directory which contains the RomFS, relative to the Makefile (Optional)
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# APP_TITLE is the name of the app stored in the SMDH file (Optional)
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# APP_DESCRIPTION is the description of the app stored in the SMDH file (Optional)
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# APP_AUTHOR is the author of the app stored in the SMDH file (Optional)
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# ICON is the filename of the icon (.png), relative to the project folder.
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# If not set, it attempts to use one of the following (in this order):
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# - <Project name>.png
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# - icon.png
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# - <libctru folder>/default_icon.png
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#---------------------------------------------------------------------------------
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TARGET := $(notdir $(CURDIR))
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BUILD := build
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SOURCES := source
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DATA := data
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INCLUDES := include
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#ROMFS := romfs
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#---------------------------------------------------------------------------------
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# options for code generation
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#---------------------------------------------------------------------------------
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ARCH := -march=armv6k -mtune=mpcore -mfloat-abi=hard -mtp=soft
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CFLAGS := -g -Wall -O2 -mword-relocations \
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-fomit-frame-pointer -ffunction-sections \
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$(ARCH)
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CFLAGS += $(INCLUDE) -DARM11 -D_3DS
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CXXFLAGS := $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++11
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ASFLAGS := -g $(ARCH)
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LDFLAGS = -specs=3dsx.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)
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LIBS := -lcitro3d -lctru -lm
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#---------------------------------------------------------------------------------
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# list of directories containing libraries, this must be the top level containing
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# include and lib
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#---------------------------------------------------------------------------------
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LIBDIRS := $(CTRULIB)
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#---------------------------------------------------------------------------------
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# no real need to edit anything past this point unless you need to add additional
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# rules for different file extensions
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#---------------------------------------------------------------------------------
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ifneq ($(BUILD),$(notdir $(CURDIR)))
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#---------------------------------------------------------------------------------
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export OUTPUT := $(CURDIR)/$(TARGET)
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export TOPDIR := $(CURDIR)
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export VPATH := $(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
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$(foreach dir,$(DATA),$(CURDIR)/$(dir))
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export DEPSDIR := $(CURDIR)/$(BUILD)
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CFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
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CPPFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
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SFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
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PICAFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.v.pica)))
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SHLISTFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.shlist)))
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BINFILES := $(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
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#---------------------------------------------------------------------------------
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# use CXX for linking C++ projects, CC for standard C
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#---------------------------------------------------------------------------------
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ifeq ($(strip $(CPPFILES)),)
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#---------------------------------------------------------------------------------
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export LD := $(CC)
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#---------------------------------------------------------------------------------
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else
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#---------------------------------------------------------------------------------
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export LD := $(CXX)
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#---------------------------------------------------------------------------------
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endif
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#---------------------------------------------------------------------------------
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export OFILES_SOURCES := $(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
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export OFILES_BIN := $(addsuffix .o,$(BINFILES)) \
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$(PICAFILES:.v.pica=.shbin.o) $(SHLISTFILES:.shlist=.shbin.o)
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export OFILES := $(OFILES_BIN) $(OFILES_SOURCES)
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export HFILES := $(PICAFILES:.v.pica=_shbin.h) $(addsuffix .h,$(subst .,_,$(BINFILES)))
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export INCLUDE := $(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
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$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
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-I$(CURDIR)/$(BUILD)
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export LIBPATHS := $(foreach dir,$(LIBDIRS),-L$(dir)/lib)
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ifeq ($(strip $(ICON)),)
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icons := $(wildcard *.png)
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ifneq (,$(findstring $(TARGET).png,$(icons)))
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export APP_ICON := $(TOPDIR)/$(TARGET).png
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else
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ifneq (,$(findstring icon.png,$(icons)))
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export APP_ICON := $(TOPDIR)/icon.png
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endif
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endif
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else
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export APP_ICON := $(TOPDIR)/$(ICON)
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endif
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ifeq ($(strip $(NO_SMDH)),)
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export _3DSXFLAGS += --smdh=$(CURDIR)/$(TARGET).smdh
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endif
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ifneq ($(ROMFS),)
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export _3DSXFLAGS += --romfs=$(CURDIR)/$(ROMFS)
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endif
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.PHONY: $(BUILD) clean all
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#---------------------------------------------------------------------------------
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all: $(BUILD)
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$(BUILD):
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@[ -d $@ ] || mkdir -p $@
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@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
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#---------------------------------------------------------------------------------
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clean:
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@echo clean ...
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@rm -fr $(BUILD) $(TARGET).3dsx $(OUTPUT).smdh $(TARGET).elf
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#---------------------------------------------------------------------------------
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else
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DEPENDS := $(OFILES:.o=.d)
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#---------------------------------------------------------------------------------
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# main targets
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#---------------------------------------------------------------------------------
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ifeq ($(strip $(NO_SMDH)),)
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$(OUTPUT).3dsx : $(OUTPUT).elf $(OUTPUT).smdh
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else
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$(OUTPUT).3dsx : $(OUTPUT).elf
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endif
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$(OFILES_SOURCES) : $(HFILES)
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$(OUTPUT).elf : $(OFILES)
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#---------------------------------------------------------------------------------
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# you need a rule like this for each extension you use as binary data
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#---------------------------------------------------------------------------------
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%.bin.o %_bin.h : %.bin
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#---------------------------------------------------------------------------------
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@echo $(notdir $<)
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@$(bin2o)
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#---------------------------------------------------------------------------------
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# rules for assembling GPU shaders
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#---------------------------------------------------------------------------------
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define shader-as
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$(eval CURBIN := $*.shbin)
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echo "extern const u8" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"_end[];" > `(echo $(CURBIN) | tr . _)`.h
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echo "extern const u8" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"[];" >> `(echo $(CURBIN) | tr . _)`.h
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echo "extern const u32" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`_size";" >> `(echo $(CURBIN) | tr . _)`.h
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picasso -o $(CURBIN) $1
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bin2s $(CURBIN) | $(AS) -o $*.shbin.o
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endef
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%.shbin.o %_shbin.h : %.v.pica
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@echo $(notdir $<)
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@$(call shader-as,$<)
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-include $(DEPENDS)
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#---------------------------------------------------------------------------------------
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endif
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#---------------------------------------------------------------------------------------

‎graphics/gpu/proctex/source/main.c‎

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#include <3ds.h>
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#include <citro3d.h>
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#include <string.h>
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#include <stdio.h>
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#include "vshader_shbin.h"
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#define CLEAR_COLOR 0x68B0D8FF
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#define DISPLAY_TRANSFER_FLAGS \
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(GX_TRANSFER_FLIP_VERT(0) | GX_TRANSFER_OUT_TILED(0) | GX_TRANSFER_RAW_COPY(0) | \
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GX_TRANSFER_IN_FORMAT(GX_TRANSFER_FMT_RGBA8) | GX_TRANSFER_OUT_FORMAT(GX_TRANSFER_FMT_RGB8) | \
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GX_TRANSFER_SCALING(GX_TRANSFER_SCALE_NO))
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static DVLB_s* vshader_dvlb;
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static shaderProgram_s program;
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static int uLoc_projection;
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static C3D_Mtx projection;
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static C3D_ProcTex pt;
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static C3D_ProcTexLut pt_map;
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static C3D_ProcTexLut pt_noise;
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static C3D_ProcTexColorLut pt_clr;
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static void sceneInit(void)
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{
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// Load the vertex shader, create a shader program and bind it
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vshader_dvlb = DVLB_ParseFile((u32*)vshader_shbin, vshader_shbin_size);
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shaderProgramInit(&program);
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shaderProgramSetVsh(&program, &vshader_dvlb->DVLE[0]);
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C3D_BindProgram(&program);
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// Get the location of the uniforms
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uLoc_projection = shaderInstanceGetUniformLocation(program.vertexShader, "projection");
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// Configure attributes for use with the vertex shader
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// Attribute format and element count are ignored in immediate mode
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C3D_AttrInfo* attrInfo = C3D_GetAttrInfo();
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AttrInfo_Init(attrInfo);
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AttrInfo_AddLoader(attrInfo, 0, GPU_FLOAT, 3); // v0=position
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AttrInfo_AddLoader(attrInfo, 1, GPU_FLOAT, 3); // v1=texcoord0
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// Compute the projection matrix
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Mtx_OrthoTilt(&projection, 0.0, 400.0, 240.0, 0.0, 0.0, 1.0, true);
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#define NUMCOLORS 2
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C3D_ProcTexInit(&pt, 0, NUMCOLORS);
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C3D_ProcTexClamp(&pt, GPU_PT_MIRRORED_REPEAT, GPU_PT_MIRRORED_REPEAT);
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C3D_ProcTexNoiseCoefs(&pt, C3D_ProcTex_UV, 0.1f, 0.3f, 0.1f);
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C3D_ProcTexCombiner(&pt, false, GPU_PT_SQRT2, GPU_PT_SQRT2); // <- for wood rings
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//C3D_ProcTexCombiner(&pt, false, GPU_PT_V, GPU_PT_V); // <- for wood stripes (or also _U)
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C3D_ProcTexFilter(&pt, GPU_PT_LINEAR);
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C3D_ProcTexBind(0, &pt);
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float data[129];
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int i;
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for (i = 0; i <= 128; i ++)
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{
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float x = i/128.0f;
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data[i] = fabsf(sinf(C3D_Angle(6*(x+0.125f)))); // 6*2 = 12 stripes
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}
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ProcTexLut_FromArray(&pt_map, data);
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C3D_ProcTexLutBind(GPU_LUT_RGBMAP, &pt_map);
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// Noise smooth step equation
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for (i = 0; i <= 128; i ++)
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{
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float x = i/128.0f;
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data[i] = x*x*(3-2*x);
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}
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ProcTexLut_FromArray(&pt_noise, data);
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C3D_ProcTexLutBind(GPU_LUT_NOISE, &pt_noise);
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u32 colors[NUMCOLORS];
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colors[0] = 0xFF1F1F4F; // dark brown
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colors[1] = 0xFF1F9ED1; // light brown
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ProcTexColorLut_Write(&pt_clr, colors, 0, NUMCOLORS);
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C3D_ProcTexColorLutBind(&pt_clr);
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// Configure the first fragment shading substage to just pass through the procedural texture color
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// See https://www.opengl.org/sdk/docs/man2/xhtml/glTexEnv.xml for more insight
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C3D_TexEnv* env = C3D_GetTexEnv(0);
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C3D_TexEnvSrc(env, C3D_Both, GPU_TEXTURE3, 0, 0);
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C3D_TexEnvOp(env, C3D_Both, 0, 0, 0);
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C3D_TexEnvFunc(env, C3D_Both, GPU_REPLACE);
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}
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static void sceneRender(void)
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{
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// Update the uniforms
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C3D_FVUnifMtx4x4(GPU_VERTEX_SHADER, uLoc_projection, &projection);
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// Draw the triangle directly
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//float min = -1.0f; //<-- for (symmetrical) wood rings
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//float max = +1.0f;
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float min = 1.0f; //<-- for asymmetrical wood rings
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float max = 3.0f;
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//float min = 0.0f; //<-- for wood stripes
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//float max = +3.0f; // triplicate stripes
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float size = 200.0f/2;
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C3D_ImmDrawBegin(GPU_TRIANGLE_STRIP);
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C3D_ImmSendAttrib(200.0f-size, 120.0f+size, 0.5f, 0.0f); // v0=position
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C3D_ImmSendAttrib(min, min, 0.0f, 0.0f); // v1=texcoord0
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C3D_ImmSendAttrib(200.0f+size, 120.0f+size, 0.5f, 0.0f);
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C3D_ImmSendAttrib(max, min, 0.0f, 0.0f);
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C3D_ImmSendAttrib(200.0f-size, 120.0f-size, 0.5f, 0.0f);
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C3D_ImmSendAttrib(min, max, 0.0f, 0.0f);
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C3D_ImmSendAttrib(200.0f+size, 120.0f-size, 0.5f, 0.0f);
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C3D_ImmSendAttrib(max, max, 0.0f, 0.0f);
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C3D_ImmDrawEnd();
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}
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static void sceneExit(void)
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{
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// Free the shader program
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shaderProgramFree(&program);
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DVLB_Free(vshader_dvlb);
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}
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int main()
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{
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// Initialize graphics
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gfxInitDefault();
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consoleInit(GFX_BOTTOM, NULL);
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C3D_Init(C3D_DEFAULT_CMDBUF_SIZE);
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// Initialize the render target
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C3D_RenderTarget* target = C3D_RenderTargetCreate(240, 400, GPU_RB_RGBA8, GPU_RB_DEPTH24_STENCIL8);
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C3D_RenderTargetSetClear(target, C3D_CLEAR_ALL, CLEAR_COLOR, 0);
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C3D_RenderTargetSetOutput(target, GFX_TOP, GFX_LEFT, DISPLAY_TRANSFER_FLAGS);
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// Initialize the scene
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sceneInit();
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// Main loop
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while (aptMainLoop())
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{
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hidScanInput();
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// Respond to user input
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u32 kDown = hidKeysDown();
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if (kDown & KEY_START)
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break; // break in order to return to hbmenu
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printf("\x1b[29;1Hgpu: %5.2f%% cpu: %5.2f%% buf:%5.2f%%\n", C3D_GetDrawingTime()*3, C3D_GetProcessingTime()*3, C3D_GetCmdBufUsage()*100);
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// Render the scene
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C3D_FrameBegin(C3D_FRAME_SYNCDRAW);
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C3D_FrameDrawOn(target);
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sceneRender();
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C3D_FrameEnd(0);
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}
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// Deinitialize the scene
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sceneExit();
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// Deinitialize graphics
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C3D_Fini();
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gfxExit();
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return 0;
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}

‎graphics/gpu/proctex/source/vshader.v.pica‎

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; Example PICA200 vertex shader
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; Uniforms
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.fvec projection[4]
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; Constants
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.constf myconst(0.0, 1.0, -1.0, 0.1)
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.constf myconst2(0.3, 0.0, 0.0, 0.0)
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.alias zeros myconst.xxxx ; Vector full of zeros
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.alias ones myconst.yyyy ; Vector full of ones
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; Outputs
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.out outpos position
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.out outtc0 texcoord0
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; Inputs (defined as aliases for convenience)
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.alias inpos v0
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.alias intc0 v1
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.proc main
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; Force the w component of inpos to be 1.0
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mov r0.xyz, inpos
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mov r0.w, ones
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; outpos = projectionMatrix * inpos
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dp4 outpos.x, projection[0], r0
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dp4 outpos.y, projection[1], r0
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dp4 outpos.z, projection[2], r0
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dp4 outpos.w, projection[3], r0
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; outtc0 = intc0
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mov outtc0, intc0
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; We're finished
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end
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.end

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