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我正在尝试渲染纹理（真的认为它会比这更容易！）

我找到了这个资源：这似乎正是我想要的

但是，在 GL11ExtensionPack gl11ep = (GL11ExtensionPack) gl; 上，我得到了 ClassCastException

谁能告诉我为什么？

  public void renderToTexture(GLRenderer glRenderer, GL10 gl)
  {
    boolean checkIfContextSupportsExtension = checkIfContextSupportsExtension(gl, "GL_OES_framebuffer_object");
    if(checkIfContextSupportsExtension)
    {
      GL11ExtensionPack gl11ep = (GL11ExtensionPack) gl;

      int mFrameBuffer = createFrameBuffer(gl,texture.getWidth(), texture.getHeight(), texture.getGLID());

      gl11ep.glBindFramebufferOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES, mFrameBuffer);

      gl.glClearColor(0f, 1f, 0f, 1f);

      gl11ep.glBindFramebufferOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES, 0);
    }
  }

通过删除修复的问题 setDebugFlags(GLSurfaceView.DEBUG_LOG_GL_CALLS);

但是，它仍然没有修改纹理。我修改了代码，所以它所做的只是清除绿色，所以纹理应该变成全绿色。这是 createFrameBuffer 方法。我真的不明白这里发生的一切：/

private int createFrameBuffer(GL10 gl, int width, int height, int targetTextureId) {
GL11ExtensionPack gl11ep = (GL11ExtensionPack) gl;
int framebuffer;
int[] framebuffers = new int[1];
gl11ep.glGenFramebuffersOES(1, framebuffers, 0);
framebuffer = framebuffers[0];
gl11ep.glBindFramebufferOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES, framebuffer);

int depthbuffer;
int[] renderbuffers = new int[1];
gl11ep.glGenRenderbuffersOES(1, renderbuffers, 0);
depthbuffer = renderbuffers[0];

gl11ep.glBindRenderbufferOES(GL11ExtensionPack.GL_RENDERBUFFER_OES, depthbuffer);
gl11ep.glRenderbufferStorageOES(GL11ExtensionPack.GL_RENDERBUFFER_OES,
        GL11ExtensionPack.GL_DEPTH_COMPONENT16, width, height);
gl11ep.glFramebufferRenderbufferOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES,
        GL11ExtensionPack.GL_DEPTH_ATTACHMENT_OES,
        GL11ExtensionPack.GL_RENDERBUFFER_OES, depthbuffer);

gl11ep.glFramebufferTexture2DOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES,
        GL11ExtensionPack.GL_COLOR_ATTACHMENT0_OES, GL10.GL_TEXTURE_2D,
        targetTextureId, 0);
int status = gl11ep.glCheckFramebufferStatusOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES);
if (status != GL11ExtensionPack.GL_FRAMEBUFFER_COMPLETE_OES) {
    //throw new RuntimeException("Framebuffer is not complete: " +
    //        Integer.toHexString(status));
  Log.v("error","Frame buffer not complete");
} else {
  gl11ep.glBindFramebufferOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES, 0);
  return -1;
}
return framebuffer;

}

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1 回答 1

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调用setDebugFlagsaGLSurfaceView来包装 GL 实例具有/具有不实现所有GL*接口的不幸副作用。不幸的是，该问题并未说明在哪个版本中已修复此问题。

于 2012-04-02T17:42:54.863 回答