OpenGL的Andr​​oid上 - 纹理映射 - 只有左上角像素可见 [英] OpenGL on Android - Texture Mapping - Only top left pixel visible

问题描述

我一直在玩OpenGL ES的Andr​​oid和不知我的纹理总是充满了左上角最像素的颜色。我想的标志是错误的，但我已经尝试了很多的逻辑组合，似乎它没有任何区别。

为什么质感表现得像这样吗？什么是位（标志确实是位）我缺少什么？谢谢

 公共无效loadGLTexture（GL10 GL，上下文的背景下）{
    位图位图= BitmapFactory.de codeResource（context.getResources（），RESOURCEID）;    gl.glGenTextures（1，纹理，0）;
    gl.glBindTexture（GL10.GL_TEXTURE_2D，纹理[0]）;    gl.glTexParameterf（GL10.GL_TEXTURE_2D，GL10.GL_TEXTURE_MIN_FILTER，GL10.GL_NEAREST）;
    gl.glTexParameterf（GL10.GL_TEXTURE_2D，GL10.GL_TEXTURE_MAG_FILTER，GL10.GL_LINEAR）;
    gl.glTexParameterf（GL10.GL_TEXTURE_2D，GL10.GL_TEXTURE_WRAP_S，GL10.GL_CLAMP_TO_EDGE）;
    gl.glTexParameterf（GL10.GL_TEXTURE_2D，GL10.GL_TEXTURE_WRAP_T，GL10.GL_CLAMP_TO_EDGE）;
    gl.glTexEnvf（GL10.GL_TEXTURE_ENV，GL10.GL_TEXTURE_ENV_MODE，GL10.GL_REPLACE）;    GLUtils.texImage2D（GL10.GL_TEXTURE_2D，0，位图，0）;    bitmap.recycle（）;
}公共无效画（GL10 GL）{
    //绑定pviously生成的纹理的$ P $
    gl.glBindTexture（GL10.GL_TEXTURE_2D，纹理[0]）;    （（GL11Ext）GL）.glDrawTexfOES（position.getX（），position.getY（），0，宽度，高度）;
}
 

的表面被设置为

  gl.glEnable（GL10.GL_TEXTURE_2D）;
gl.glShadeModel（GL10.GL_SMOOTH）;
gl.glClearColor（0.0，0.0，0.0，0.5F）;
gl.glClearDepthf（1.0F）;
gl.glEnable（GL10.GL_DEPTH_TEST）;
gl.glDepthFunc（GL10.GL_LEQUAL）;
gl.glHint（GL10.GL_PERSPECTIVE_CORRECTION_HINT，GL10.GL_FASTEST）;
 

解决方案

显然质感裁剪矩形已被明确地设置：

  INT cropWorkspace [] =新INT [4];
最后BitmapFactory.Options选项=新BitmapFactory.Options（）;
options.in preferredConfig = Bitmap.Config.RGB_565;
cropWorkspace [0] = 0;
cropWorkspace [1] =高度;
cropWorkspace [2] =宽度;
cropWorkspace [3] = -height;（（GL11）GL）.glTexParameteriv（GL10.GL_TEXTURE_2D，GL11Ext.GL_TEXTURE_CROP_RECT_OES，cropWorkspace，0）;
 

I've been playing with OpenGL ES Android and somehow my textures are always filled with the color of the the top left-most pixel. I suppose the flags are wrong, but I've tried a many logical combinations and it does not seem to make any difference.

Why would the texture behave like so? What's the bit (flag bit indeed) that am I missing? Thanks

public void loadGLTexture(GL10 gl, Context context) {
    Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), resourceId);

    gl.glGenTextures(1, textures, 0);
    gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);

    gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST);
    gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
    gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_CLAMP_TO_EDGE);
    gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_CLAMP_TO_EDGE);
    gl.glTexEnvf(GL10.GL_TEXTURE_ENV, GL10.GL_TEXTURE_ENV_MODE, GL10.GL_REPLACE);

    GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);

    bitmap.recycle();
}

public void draw(GL10 gl) {
    // bind the previously generated texture
    gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);

    ((GL11Ext) gl).glDrawTexfOES(position.getX(), position.getY(), 0, width, height);
}

the surface is set to

gl.glEnable(GL10.GL_TEXTURE_2D);
gl.glShadeModel(GL10.GL_SMOOTH);
gl.glClearColor(0.0f, 0.0f, 0.0f, 0.5f);
gl.glClearDepthf(1.0f);
gl.glEnable(GL10.GL_DEPTH_TEST);
gl.glDepthFunc(GL10.GL_LEQUAL);
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);

解决方案

Obviously texture crop rectangle has to be explicitly set:

int cropWorkspace[] = new int[4];
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.RGB_565;
cropWorkspace[0] = 0;
cropWorkspace[1] = height;
cropWorkspace[2] = width;
cropWorkspace[3] = -height;

((GL11) gl).glTexParameteriv(GL10.GL_TEXTURE_2D, GL11Ext.GL_TEXTURE_CROP_RECT_OES, cropWorkspace, 0);

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