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  [solved] glGetBufferSubData only spits out zeroes  (Read 1399 times)
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Offline Mads

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Medals: 26
Projects: 3
Exp: 6 years


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« Posted 2016-09-26 13:56:46 »

This method will only return and print zeroes. The FloatBuffer is filling up though, but with zeroes. What am I doing wrong?

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public void getVertices(int offset, int length, float[] container) {
      GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, positionVboID);
      FloatBuffer buffer = BufferUtils.newFloatBuffer(length);
      GL15.glGetBufferSubData(GL15.GL_ARRAY_BUFFER, offset*4, buffer);
      GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
      System.out.println(buffer.toString());
      for (int i = 0; i < buffer.capacity(); i++) {
         System.out.println(i+":"+buffer.get(i));
      }  
      buffer.get(container, 0, length);
}

Offline Mads

JGO Ninja


Medals: 26
Projects: 3
Exp: 6 years


One for all!


« Reply #1 - Posted 2016-09-26 14:31:11 »

After some debugging I found out that OpenGL throws an invalid value error. According to the OpenGL docs, this happens when
Quote
GL_INVALID_VALUE is generated if offset or size is negative, or if offset+size is greater than the value of GL_BUFFER_SIZE for the buffer object

I can't see how this is possible...

Offline Mads

JGO Ninja


Medals: 26
Projects: 3
Exp: 6 years


One for all!


« Reply #2 - Posted 2016-09-26 14:36:40 »

It appears I specified a length greater than the buffer. Oops. My bad.

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