Java （LWJGL3）使用glTexSubImage3D上载图像数据后，OpenGL 2D纹理数组保持为空

因此，我目前正在尝试用2D纹理阵列替换我的旧纹理atlas缝合器，以便在以后使用各向异性过滤和贪婪网格使生活更简单

我用stb加载png文件，我知道缓冲区被正确填充，因为如果我在上传之前导出即将发布的atlas的每一层，它就是正确的png文件

我的设置如下所示：

public void init(int layerCount, boolean supportsAlpha, int textureSize) {
    this.textureId = glGenTextures();
    this.maxLayer = layerCount;

    int internalFormat = supportsAlpha ? GL_RGBA8 : GL_RGB8;
    this.format = supportsAlpha ? GL_RGBA : GL_RGB;

    glBindTexture(GL_TEXTURE_2D_ARRAY, this.textureId);
    glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, internalFormat, textureSize, textureSize, layerCount, 0, this.format, GL_UNSIGNED_BYTE, 0);
}

public void upload(ITextureLayer textureLayer) {
    if (textureLayer.getLayer() >= this.maxLayer) {
        LOGGER.error("Tried uploading a texture with a too big layer.");
        return;
    } else if (this.textureId == 0) {
        LOGGER.error("Tried uploading texture layer to uninitialized texture array.");
        return;
    }

    glBindTexture(GL_TEXTURE_2D_ARRAY, this.textureId);

    // Tell openGL how to unpack the RGBA bytes
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);


    // Tell openGL to not blur the texture when it is stretched
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    // Upload the texture data
    glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, textureLayer.getLayer(), textureLayer.getWidth(), textureLayer.getHeight(), 0, this.format, GL_UNSIGNED_BYTE, textureLayer.getPixels());

    int errorCode = glGetError();
    if (errorCode != 0) LOGGER.error("Error while uploading texture layer {} to graphics card. {}", textureLayer.getLayer(), GLHelper.errorToString(errorCode));
}

我用stb加载jar文件中的每个纹理，并用它创建一个对象，其中存储宽度、高度、图层和像素数据

加载每个纹理时，我会查找最大的纹理，并将每个较小的纹理缩放到与最大纹理相同的大小，因为我知道2D纹理阵列仅在每个层都具有相同大小的情况下工作

然后我初始化2d纹理数组，如下所示：

public void init(int layerCount, boolean supportsAlpha, int textureSize) {
    this.textureId = glGenTextures();
    this.maxLayer = layerCount;

    int internalFormat = supportsAlpha ? GL_RGBA8 : GL_RGB8;
    this.format = supportsAlpha ? GL_RGBA : GL_RGB;

    glBindTexture(GL_TEXTURE_2D_ARRAY, this.textureId);
    glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, internalFormat, textureSize, textureSize, layerCount, 0, this.format, GL_UNSIGNED_BYTE, 0);
}

public void upload(ITextureLayer textureLayer) {
    if (textureLayer.getLayer() >= this.maxLayer) {
        LOGGER.error("Tried uploading a texture with a too big layer.");
        return;
    } else if (this.textureId == 0) {
        LOGGER.error("Tried uploading texture layer to uninitialized texture array.");
        return;
    }

    glBindTexture(GL_TEXTURE_2D_ARRAY, this.textureId);

    // Tell openGL how to unpack the RGBA bytes
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);


    // Tell openGL to not blur the texture when it is stretched
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    // Upload the texture data
    glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, textureLayer.getLayer(), textureLayer.getWidth(), textureLayer.getHeight(), 0, this.format, GL_UNSIGNED_BYTE, textureLayer.getPixels());

    int errorCode = glGetError();
    if (errorCode != 0) LOGGER.error("Error while uploading texture layer {} to graphics card. {}", textureLayer.getLayer(), GLHelper.errorToString(errorCode));
}

之后，我浏览我的textureLayer对象地图，并像下面这样上传它们中的每一个：

public void init(int layerCount, boolean supportsAlpha, int textureSize) {
    this.textureId = glGenTextures();
    this.maxLayer = layerCount;

    int internalFormat = supportsAlpha ? GL_RGBA8 : GL_RGB8;
    this.format = supportsAlpha ? GL_RGBA : GL_RGB;

    glBindTexture(GL_TEXTURE_2D_ARRAY, this.textureId);
    glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, internalFormat, textureSize, textureSize, layerCount, 0, this.format, GL_UNSIGNED_BYTE, 0);
}

public void upload(ITextureLayer textureLayer) {
    if (textureLayer.getLayer() >= this.maxLayer) {
        LOGGER.error("Tried uploading a texture with a too big layer.");
        return;
    } else if (this.textureId == 0) {
        LOGGER.error("Tried uploading texture layer to uninitialized texture array.");
        return;
    }

    glBindTexture(GL_TEXTURE_2D_ARRAY, this.textureId);

    // Tell openGL how to unpack the RGBA bytes
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);


    // Tell openGL to not blur the texture when it is stretched
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    // Upload the texture data
    glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, textureLayer.getLayer(), textureLayer.getWidth(), textureLayer.getHeight(), 0, this.format, GL_UNSIGNED_BYTE, textureLayer.getPixels());

    int errorCode = glGetError();
    if (errorCode != 0) LOGGER.error("Error while uploading texture layer {} to graphics card. {}", textureLayer.getLayer(), GLHelper.errorToString(errorCode));
}

我的每一层的错误代码都是0，所以我假设一切都很顺利。但当我用RenderDoc调试游戏时，我可以看到在每一层上，每一位都是0，因此它只是一个具有正确宽度和高度的透明纹理

我不知道我做错了什么，因为openGL告诉我一切都很顺利。对我来说，我只使用openGL 3.3及更低版本是很重要的，因为我希望游戏也能在较旧的PC上玩，所以使用

glTexStorage3D

预先分配内存不是一个选项。

的第八个参数应该是1（

depth

）。
注意，层的大小是

textureLayer.getWidth（）

，

textureLayer.getHeight（）

，

1

：

glTexSubImage3D(
    GL_TEXTURE_2D_ARRAY, 0, 0, 0, textureLayer.getLayer(),
    textureLayer.getWidth(), textureLayer.getHeight(), 1,    // depth is 1
    this.format, GL_UNSIGNED_BYTE, textureLayer.getPixels());

将0的

宽度

、

高度

或

深度

传递到

glTexSubImage3D

不是错误，但不会对纹理对象数据存储产生任何影响