更新TextureArray Computeshader

Question

我正在尝试更新TextureArray，但是在调用glTexSubImage3D()时，它仅更新纹理的第一层。其余的仍然充满零。在此代码示例m_layerCount = 10中。存储在Computeshader中的vec4 tmp中的结果始终等于TextureArray中第一层的像素，因为其他层的所有像素均为零。当仅查看第一层以外的任何其他层时，也可以查看此视图​​。

Opengl：

  // init
  glActiveTexture(GL_TEXTURE0);
  glGenTextures(1, &tex.handle);
  glBindTexture(GL_TEXTURE_2D_ARRAY, tex.handle);
  glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
  glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
  glTexStorage3D(GL_TEXTURE_2D_ARRAY, 1, GL_R32F, m_res.x, m_res.y, m_layerCount);


  ... 


  // update
  glActiveTexture(GL_TEXTURE0);
  glBindTexture(GL_TEXTURE_2D_ARRAY, tex.handle);

  // there is a pbo for every texture, all are filled and work!
  for(unsigned int j = 0; j < m_layerCount; j++){
    glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo_container[j].handle);
    glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, j, m_res.x, m_res.y, 1, GL_RED, GL_FLOAT, 0);
    glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
  }

Computeshader：

layout (binding = 0, r32f) uniform image2DArray srcTex;
layout(local_size_x = 10, local_size_y = 10) in;

void main(){
  ivec2 idx = ivec2(gl_GlobalInvocationID.xy);
  vec4 tmp = vec4(0, 0, 0, 0);

  for(int i = 0; i < 10; i++){
    tmp += imageLoad(srcTex, ivec3(idx, i));
  }
}