我收到了几个用户报告说屏幕上有白块，但我不确定是什么原因导致的。它在大多数手机上都能正常工作，但我不确定问题可能出在哪里。（已知在Galaxy Nexus和Droid Pro上无法正常工作，但在我的原始Droid上可以正常工作）。我很困惑，以下是我的代码和用户发布的问题截图。您有什么想法可能会导致这种情况吗？它是用ES 1.1编写的。那些无法加载的是透明png图片，被绘制为透明。
gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA);
代码：
public class MenuButton {
AssetManager assetManager;
GL10 gl;
// Our vertices.
//Our texture.
private float texture[] = {
//Mapping coordinates for the vertices
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f,
};
// The order we like to connect them.
private byte indices[] = {0,1,3,2};
// Our vertex buffer.
private FloatBuffer vertexBuffer;
// Our index buffer.
private ByteBuffer indexBuffer;
//texture buffer.
private FloatBuffer textureBuffer;
//Our texture pointer.
private int[] textures = new int[3];
float width;
float height;
public MenuButton(Bitmap graphic,GL10 _gl, int _width, int _height) {
width=_width;
height=_height;
float vertices[] = {
0f, -_width, 0.0f, //LB
width, -_width, 0.0f, //RB
0, 0, 0.0f, //LT
_width, 0.0f, 0.0f, //RT
};
gl=_gl;
ByteBuffer byteBuf = ByteBuffer.allocateDirect(vertices.length * 4);
byteBuf.order(ByteOrder.nativeOrder());
vertexBuffer = byteBuf.asFloatBuffer();
vertexBuffer.put(vertices);
vertexBuffer.position(0);
//
byteBuf = ByteBuffer.allocateDirect(texture.length * 4);
byteBuf.order(ByteOrder.nativeOrder());
textureBuffer = byteBuf.asFloatBuffer();
textureBuffer.put(texture);
textureBuffer.position(0);
//
indexBuffer = ByteBuffer.allocateDirect(indices.length);
indexBuffer.put(indices);
indexBuffer.position(0);
loadGLTexture(0, graphic);
}
/**
* This function draws our square on screen.
* @param gl
*/
public void draw(GL10 gl) {
//Bind our only previously generated texture in this case
gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
//Point to our buffers
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
//Set the face rotation
gl.glFrontFace(GL10.GL_CCW);
//Enable the vertex and texture state
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, textureBuffer);
gl.glEnable(GL10.GL_CULL_FACE);
//Draw the vertices as triangles, based on the Index Buffer information
gl.glDrawElements(GL10.GL_TRIANGLE_FAN, indices.length, GL10.GL_UNSIGNED_BYTE, indexBuffer);
// Disable the vertices buffer.
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
//Disable the texture buffer.
gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
}
/**
* Load the textures
*
* @param gl - The GL Context
* @param context - The Activity context
*/
public void destroyTexture() {
gl.glDeleteTextures(3, textures, 0);
}
public void loadGLTexture(int graphicsToLoad,Bitmap bitmap) {
//Generate three texture pointers...
gl.glGenTextures(3, textures, 0);
//...and bind it to our array
gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
//Create Nearest Filtered Texture
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR_MIPMAP_NEAREST);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
gl.glTexParameterf(GL11.GL_TEXTURE_2D, GL11.GL_GENERATE_MIPMAP, GL11.GL_TRUE);
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);
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
bitmap.recycle();
}
public boolean amIHit(float[] matrixValues,MotionEvent event) {
Log.e("sys",""+event.getY());
// if (((event.getX())>(0)&&((event.getX()))<5+width)&&((event.getY())>0)&&(event.getY()<width)) {
if (((event.getX()>0)&&(event.getX()<5+width))&&((event.getY()>0)&&(event.getY()<5+height))) {
Log.e("sys","hit menu button.");
return true;
}
Log.e("sys","menu button not hit.");
return false;
}
}