Question

我正在尝试在OPEN GL 2.0中实现可滚动图像网格。我已经使用Canvas Drawing实现了视图，但出于性能原因，我决定转换到OGL。在我的实现中，在每个帧我绘制一个Bitmap对象列表，每个Bitmap是一个缓存的图像缩略图行。现在我该如何将这些位图转换为可以与OGL一起使用的纹理？

Answer 1

GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureID);
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);

..其中textureID是纹理的唯一ID（通常从glGenTextures()获取，或者只是保持自己的系统为每个新纹理分配一个新的ID号）。 bitmap是Bitmap对象。

我的纹理类中的用法示例：

public class Texture {

protected String name;
protected int textureID = -1;
protected String filename;

public Texture(String filename){
    this.filename = filename;
}

public void loadTexture(GL10 gl, Context context){

    String[] filenamesplit = filename.split("\\.");

    name = filenamesplit[filenamesplit.length-2];

    int[] textures = new int[1];
    //Generate one texture pointer...
    //GLES20.glGenTextures(1, textures, 0);

    // texturecount is just a public int in MyActivity extends Activity
    // I use this because I have issues with glGenTextures() not working                
    textures[0] = ((MyActivity)context).texturecount;
    ((MyActivity)context).texturecount++;

    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textures[0]);

    //Create Nearest Filtered Texture
    GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
    GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);

    //Different possible texture parameters, e.g. GLES20.GL_CLAMP_TO_EDGE
    GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_REPEAT);
    GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_REPEAT);

    Bitmap bitmap = FileUtil.openBitmap(name, context);

    GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);

    bitmap.recycle();   

    textureID = textures[0];

}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getTextureID() {
    return textureID;
}

public void setTextureID(int textureID) {
    this.textureID = textureID;
}


}

OPEN GL Android - 如何将Bitmap对象转换为可绘制纹理

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