我在使用cpp-tests的SpriteBlur时发生了错误

[jackie-weiwei]

• axmol version: 2.1.3-db05744
• devices test on: windows
• developing environments
  • NDK version: r23c
  • Xcode version: 14.2+
  • Visual Studio:
    • VS version: 2022 (17.9+)
    • MSVC version: 19.39+
    • Windows SDK version: 10.0.22621.0+
  • cmake version:
    Steps to Reproduce:

1. 我按照cpp-tests中的SpriteBlur的示例去显示一个Sprite时，并不显示Sprite,不知道问题出在哪里，请求帮助！

[halx99]

please provide your demo project

[jackie-weiwei]

I copied this code from axmol\tests\cpp-tests\Source\ShaderTest to my project
SpriteBlur code:

#include "axmol.h"
USING_NS_AX;


#define SET_UNIFORM(ps, name, value)                            \
    do                                                          \
    {                                                           \
        decltype(value) __v = value;                            \
        auto __loc          = (ps) -> getUniformLocation(name); \
        (ps)->setUniform(__loc, &__v, sizeof(__v));             \
    } while (false)

#define SET_TEXTURE(ps, name, idx, value)              \
    do                                                 \
    {                                                  \
        auto* __v  = value;                            \
        auto __loc = (ps) -> getUniformLocation(name); \
        (ps)->setTexture(__loc, idx, __v);             \
    } while (false)


class SpriteBlur : public Sprite
{
public:
    ~SpriteBlur();
    bool initWithTexture(Texture2D* texture, const Rect& rect);
    void initProgram();

    static SpriteBlur* create(const char* pszFileName);
    void setBlurRadius(float radius);
    void setBlurSampleNum(float num);

protected:
    float _blurRadius;
    float _blurSampleNum;
};

SpriteBlur::~SpriteBlur() {}

SpriteBlur* SpriteBlur::create(const char* pszFileName)
{
    SpriteBlur* pRet = new SpriteBlur();
    bool result      = pRet->initWithFile("");
    ax::print("Test call Sprite::initWithFile with bad file name result is : %s", result ? "true" : "false");

    if (pRet->initWithFile(pszFileName))
    {
        pRet->autorelease();
    }
    else
    {
        AX_SAFE_DELETE(pRet);
    }

    return pRet;
}

bool SpriteBlur::initWithTexture(Texture2D* texture, const Rect& rect)
{
    _blurRadius = 0;
    if (Sprite::initWithTexture(texture, rect))
    {
#if AX_ENABLE_CACHE_TEXTURE_DATA
        auto listener =
            EventListenerCustom::create(EVENT_RENDERER_RECREATED, [this](EventCustom* event) { initProgram(); });

        _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);
#endif

        initProgram();

        return true;
    }

    return false;
}

void SpriteBlur::initProgram()
{
    auto program = ProgramManager::getInstance()->loadProgram(positionTextureColor_frag, "custom/example_Blur_fs",
                                                                   VertexLayoutType::Sprite);
    auto programState = new backend::ProgramState(program);
    setProgramState(programState);
    AX_SAFE_RELEASE(programState);

    auto size = getTexture()->getContentSizeInPixels();

    SET_UNIFORM(_programState, "resolution", size);
    SET_UNIFORM(_programState, "blurRadius", _blurRadius);
    SET_UNIFORM(_programState, "sampleNum", 7.0f);
    SET_UNIFORM(_programState, "u_PMatrix",
                Director::getInstance()->getMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION));
}

void SpriteBlur::setBlurRadius(float radius)
{
    _blurRadius = radius;
    SET_UNIFORM(_programState, "blurRadius", _blurRadius);
}

void SpriteBlur::setBlurSampleNum(float num)
{
    _blurSampleNum = num;
    SET_UNIFORM(_programState, "sampleNum", _blurSampleNum);
}

// ShaderBlur

then i copied example_Blur.fsh from axmol\tests\cpp-tests\Source\shaders to my-project\build\bin\HelloCpp\Debug\axslc\custom, and rename it to example_Blur_fs.
next add code to the MainScene:

        auto mySprite = SpriteBlur::create("grossini.png");
        mySprite->setContentSize(Vec2(200, 200 ));
        mySprite->setBlurRadius(3.f);
        mySprite->setBlurSampleNum(10.f);
        mySprite->setPosition(Vec2(visibleSize.width / 2 + origin.x, visibleSize.height / 2 + origin.y));
        this->addChild(mySprite, 1000);

i run this project successfully, but the sprite is not shown. My example is basically the same as the example given in CPP-TESTS, but the sprite does not display. I don't know where the problem lies, and I am asking for your help. Very feeling! @halx99

my platform is windows 10, vs2022

[halx99]

you should copy example_Blur.fsh to my-project\build\bin\HelloCpp\Source\shaders, then execute cmake re-generate, the axmol build system will auto compile example_Blur.fsh to my-project\build\bin\HelloCpp\Debug\axslc\custom

[jackie-weiwei]

Thank you very much. @halx99 . Following your method, I can successfully display a blurred sprite. I would like to ask, is there any tutorial on how to use the shader?

[halx99]

refer to: #1279