你好 StackOverflow 社区。我一直在使用 OpenGL 为 android 制作动态壁纸，到目前为止，我已经成功地让 OpenGL 在动态壁纸上渲染，并且还能够将单个纹理加载和绑定到四边形上。但是，当我加载多个纹理时，作为板条箱纹理的最后一个绑定纹理被绑定到应该具有污垢纹理的第一个四边形上，而第二个四边形尝试绑定到不存在的纹理。
这是我的四边形类，它绘制四边形并绑定纹理对象存储的任何纹理：
public class Quad {
/** The quad's location in space. */
private float[] vector;
private Texture texture;
/** Buffer holding the vertices. */
private FloatBuffer vertexBuffer;
/** Array holding the quad's size. */
private float[] vertices;
public Quad(GL10 gl, Context context, float[] vector, Texture texture) {
this.vector = vector;
this.texture = texture;
// Check the length of the vector to make sure it is valid.
if(vector.length != 8) {
throw new IllegalArgumentException("Please pass a vector with a length of 8. (x, y, z) (w, h) (rotX, rotY, rotZ)");
}
vertices = new float[] {
0, 0, 0.0f, // V1 - bottom left
0, vector[4], 0.0f, // V2 - top left
vector[3], 0, 0.0f, // V3 - bottom right
vector[3], vector[4], 0.0f // V4 - top right
};
ByteBuffer byteBuffer = ByteBuffer.allocateDirect(vertices.length * 4);
byteBuffer.order(ByteOrder.nativeOrder());
vertexBuffer = byteBuffer.asFloatBuffer();
vertexBuffer.put(vertices);
vertexBuffer.position(0);
}
public void draw(GL10 gl) {
// Reset the Modelview Matrix
gl.glLoadIdentity();
float[] cameraVector = Camera.getLocationVector();
// Translate the object
gl.glTranslatef(vector[0] - cameraVector[0], vector[1] - cameraVector[1], vector[2] - cameraVector[2]);
// Rotate the object
gl.glRotatef(vector[5] - cameraVector[3], 1f, 0f, 0f);
gl.glRotatef(vector[6] - cameraVector[4], 0f, 1f, 0f);
gl.glRotatef(vector[7] - cameraVector[5], 0f, 0f, 1f);
// Bind the previously generated texture
int crap = texture.getTextureID();
gl.glBindTexture(GL10.GL_TEXTURE_2D, texture.getTextureID());
// 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_CW);
// Point to our vertex buffer
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, texture.getBuffer());
// Draw the vertices as triangle strip
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, vertices.length / 3);
// Disable the client state before leaving
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
}
}
这就是我初始化四边形的方式：
Texture.loadTextures(gl, context);
quad = new Quad(gl, context, new float[] { 0.0f, 0.0f, -5.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f, }, Texture.TEXTURE_DIRT);
quad2 = new Quad(gl, context, new float[] { -1.0f, 0.0f, -10.0f, 1.0f, 1.0f, 0.0f, 45.0f, 0.0f, }, Texture.TEXTURE_CRATE);
这是管理从 android 位图加载的所有壁纸纹理的纹理类：
public class Texture {
/** Buffer holding the texture coordinates. */
private FloatBuffer textureBuffer;
private final float textureCoords[] = {
0.0f, 1.0f, // Top left (V2)
0.0f, 0.0f, // Bottom left (V1)
1.0f, 1.0f, // Top right (V4)
1.0f, 0.0f // Bottom right (V3)
};
/** The texture this specific instance is pointing to. */
private int texture;
/** The id of the texture to be grabbed from android bitmap loader. */
private int textureID;
/** Stores all texture data. */
private static ArrayList<Texture> textureList;
/** List of all registered textures */
private static int lastRegisteredTexture;
/** Array of all loaded texture pointers. */
private static int[] textures;
/** Flag to indicate whether the class has been initialized properly. */
private static boolean isInitialized;
private static boolean texturesGenned;
/////////////////////////////////////////////////////////////////////////////////////////
// All recycled textures loaded on app launch
public static Texture TEXTURE_DIRT;
public static Texture TEXTURE_CRATE;
/**
* Create a new opengl texture.
* @param gl
* @param context
* @param id
*/
private Texture(GL10 gl, Context context, int id) {
if(isInitialized) {
ByteBuffer byteBuffer = ByteBuffer.allocateDirect(textureCoords.length * 4);
byteBuffer.order(ByteOrder.nativeOrder());
textureBuffer = byteBuffer.asFloatBuffer();
textureBuffer.put(textureCoords);
textureBuffer.position(0);
textureID = id;
// Add the texture into the list before loading the texture so the
// size of the texture pointer array can be determined and not have to be
// reinitialized
textureList.add(this);
} else {
throw new IllegalStateException("Not yet initialized.");
}
}
/**
* Load the texture into opengl.
* @param gl
* @param context
* @param id
*/
private static void loadGLTexture(GL10 gl, Context context) {
gl.glGenTextures(textures.length, textures, 0);
for(int i = 0; i < textureList.size(); i++) {
// Loading texture without scaling
BitmapFactory.Options opts = new BitmapFactory.Options(); opts.inScaled = false;
Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), textureList.get(i).getID(), opts);
// ...And bind it to our array
gl.glBindTexture(GL10.GL_TEXTURE_2D, textureList.get(i).getTextureID());
// Create nearest filtered texture
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_NEAREST);
// Use Android GLUtils to specify a two-dimensional texture image from our bitmap
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
textureList.get(i).texture = lastRegisteredTexture;
lastRegisteredTexture++;
// Clean up native resources
bitmap.recycle();
}
Log.d("Test", "Test2");
}
public int getTextureID() {
return textures[texture];
}
public FloatBuffer getBuffer() {
return textureBuffer;
}
private int getID() {
return textureID;
}
public static void loadTextures(GL10 gl, Context context) {
if(!isInitialized) {
isInitialized = true;
textureList = new ArrayList<Texture>();
// Load all static textures
TEXTURE_DIRT = new Texture(gl, context, R.raw.dirt);
TEXTURE_CRATE = new Texture(gl, context, R.drawable.crate);
// Initialize the texture pointer to match the number of textures
textures = new int[textureList.size()];
loadGLTexture(gl, context);
} else {
throw new IllegalStateException("Already initialized.");
}
}
}
我的暂停是由于我的逻辑缺陷，OpenGL 以某种方式加载一个纹理而不是另一个纹理，我相信问题发生在“loadGLTexture”的某个地方。提前谢谢。