Nintendo 3DS >> C/C++ >> GPU

Sprite

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參考資訊：
1. citro2d
2. libctru doc
3. 3ds-examples

說明：

API
C3D_RenderTarget *C2D_CreateScreenTarget(gfxScreen_t screen, gfx3dSide_t side)
C2D_SpriteSheet C2D_SpriteSheetLoad(const char *filename)
size_t C2D_SpriteSheetCount(C2D_SpriteSheet sheet)
void C2D_SpriteFromSheet(C2D_Sprite *sprite, C2D_SpriteSheet sheet, size_t index)
void C2D_SpriteSetCenter(C2D_Sprite *sprite, float x, float y)
void C2D_SpriteSetPos(C2D_Sprite *sprite, float x, float y)
void C2D_SpriteSetRotation(C2D_Sprite *sprite, float radians)
void C2D_SpriteRotateDegrees(C2D_Sprite *sprite, float degrees)
bool C3D_FrameBegin(u8 flags)
void C2D_TargetClear(C3D_RenderTarget *target, u32 color)
void C2D_SceneBegin(C3D_RenderTarget *target)
bool C2D_DrawSprite(const C2D_Sprite *sprite)
void C3D_FrameEnd(u8 flags)
void C2D_SpriteSheetFree(C2D_SpriteSheet sheet)
void C2D_Fini(void)
void C3D_Fini(void)

main.c

#include <citro2d.h>
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(void)
{
    C2D_Sprite spr = {0};

    gfxInitDefault();
    C3D_Init(C3D_DEFAULT_CMDBUF_SIZE);
    C2D_Init(C2D_DEFAULT_MAX_OBJECTS);

    C2D_Prepare();
    C3D_RenderTarget *top = C2D_CreateScreenTarget(GFX_TOP, GFX_LEFT);
    C2D_SpriteSheet spriteSheet = C2D_SpriteSheetLoad("sdmc:/3ds/sprites.t3x");
    size_t numImages = C2D_SpriteSheetCount(spriteSheet);

    C2D_SpriteFromSheet(&spr, spriteSheet, 0);
    C2D_SpriteSetCenter(&spr, 0, 0);
    C2D_SpriteSetPos(&spr, 200, 50);
    C2D_SpriteSetRotation(&spr, C3D_Angle(0));
    C2D_SpriteRotateDegrees(&spr, 45);

    C3D_FrameBegin(C3D_FRAME_SYNCDRAW);
    C2D_TargetClear(top, C2D_Color32(255, 0, 0, 255));
    C2D_SceneBegin(top);
    C2D_DrawSprite(&spr);
    C3D_FrameEnd(0);

    C2D_SpriteSheetFree(spriteSheet);
    C2D_Fini();
    C3D_Fini();
    svcSleepThread(3000000000LL);
    gfxExit();
    return 0;
}

sprites.t3s

--atlas -f rgba8888 -z auto
1.png

1.png

Makefile

include $(DEVKITARM)/3ds_rules

all:
	tex3ds -i sprites.t3s -H sprites.h -d sprites.d -o sprites.t3x
	arm-none-eabi-gcc -mword-relocations -ffunction-sections -march=armv6k -mtune=mpcore -mfloat-abi=hard -mtp=soft -I/opt/devkitpro/libctru/include -I/opt/devkitpro/portlibs/3ds/include/ -I/opt/devkitpro/portlibs/3ds/include/opus/ -I/opt/devkitpro/portlibs/3ds/include/SDL -D__3DS__ -c main.c -o main.o 
	arm-none-eabi-gcc -specs=3dsx.specs -march=armv6k -mtune=mpcore -mfloat-abi=hard -mtp=soft main.o -L/opt/devkitpro/portlibs/3ds/lib -lopusfile -logg -lopus -L/opt/devkitpro/libctru/lib -lSDL_image -lSDL_mixer -lSDL_ttf -lSDL_gfx -lSDL -lfreetype -lbz2 -lpng -ljpeg -lz -lcitro2d -lcitro3d -lctru -lm -lstdc++ -o main.elf
	smdhtool --create "main" "devkitARM" "steward" /opt/devkitpro/libctru/default_icon.png main.smdh
	3dsxtool main.elf main.3dsx --smdh=main.smdh

clean:
	rm -rf main.o main.elf main.3dsx main.smdh sprites.d sprites.h sprites.t3x

編譯、執行

$ sudo docker run --rm -it -v $(pwd):/source nds-env /bin/bash
root@c18881035cba:/source# make && exit
$ citra main.3dsx

完成

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