OPEN GL Android的 - 如何将位图对象转换为可绘制纹理 [英] OPEN GL Android - How to convert a Bitmap object to a drawable texture

问题描述

我想实现OPEN GL 2.0滚动图像的网格。我已经使用Canvas绘图实现的观点，但出于性能的考虑，我决定要过渡到OGL。
在我的实现，在每一帧我画位图对象的列表，每个位图是图片缩略图的缓存行。
现在我该怎样去转换这些位图的纹理，我可以OGL使用？

解决方案

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

..其中 textureID 是纹理（通常从 glGenTextures（），或以其他方式获得性的唯一ID从只是保持你自己的分配每个新的纹理一个新的ID号）的系统。 位图是位图对象。

---

在我的结构类巧用一个例子：

 公共类纹理{受保护的字符串名称;
保护INT textureID = -1;
保护字符串的文件名;公共纹理（字符串文件名）{
    this.filename =文件名;
}公共无效loadTexture（GL10 GL，上下文的背景下）{    的String [] = filenamesplit filename.split（\\\\）;    名称= filenamesplit [filenamesplit.length-2];    INT []纹理=新INT [1];
    //生成一个纹理指针...
    //GLES20.glGenTextures(1，纹理，0）;    // texturecount只是在MyActivity一个公众诠释延伸活动
    //我用这个，因为我有glGenTextures问题（）不工作
    纹理[0] =（（MyActivity）上下文）.texturecount;
    （（MyActivity）上下文）.texturecount ++;    GLES20.glBindTexture（GLES20.GL_TEXTURE_2D，纹理[0]）;    //创建最近过滤的纹理
    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）;    //不同的可能纹理参数，例如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）;    位图位图= FileUtil.openBitmap（姓名，背景）;    GLUtils.texImage2D（GLES20.GL_TEXTURE_2D，0，位图，0）;    bitmap.recycle（）;    textureID =纹理[0];}公共字符串的getName（）{
    返回名称;
}公共无效setname可以（字符串名称）{
    this.name =名称;
}公众诠释getTextureID（）{
    返回textureID;
}公共无效setTextureID（INT textureID）{
    this.textureID = textureID;
}
}
 

I'm trying to implement a Grid of scrollable images in OPEN GL 2.0. I already have the view implemented using Canvas Drawing, but for performance reasons I decided to transition to OGL. In my implementation, at each frame I draw a list of Bitmap objects, each Bitmap is a cached row of image thumbnails. Now how do I go about converting those Bitmaps to textures I can use with OGL?

解决方案

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

..where textureID is the unique ID for the texture (usually aquired from glGenTextures(), or otherwise from just keeping your own system of assigning each new texture a new ID number). bitmap is the Bitmap object.

---

An example of useage in my texture class:

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;
}


}

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