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  VBOs not working  (Read 933 times)
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Offline Waterwolf

Junior Member


Medals: 3



« Posted 2011-12-03 13:18:00 »

So I tried to get VBOs to work but it doesn't render anything and I couldn't find anything being the noob I am  Shocked

Here's the code for rendering a box
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public class TestModel implements Model {
   
   int vertexBufferID;
   
   // cube ///////////////////////////////////////////////////////////////////////
  //  v6----- v5
  // /|      /|
  //v1------v0|
  //| |     | |
  //| |v7---|-|v4
  //|/      |/
  //v2------v3
 
   //vertex coords array
  FloatBuffer vertices = BufferUtils.createFloatBuffer(3 * 24).put(new float[] {1,1,1,  -1,1,1,  -1,-1,1,  1,-1,1,        // v0-v1-v2-v3
                      1,1,1,  1,-1,1,  1,-1,-1,  1,1,-1,        // v0-v3-v4-v5
                      1,1,1,  1,1,-1,  -1,1,-1,  -1,1,1,        // v0-v5-v6-v1
                      -1,1,1,  -1,1,-1,  -1,-1,-1,  -1,-1,1,    // v1-v6-v7-v2
                      -1,-1,-1,  1,-1,-1,  1,-1,1,  -1,-1,1,    // v7-v4-v3-v2
                      1,-1,-1,  -1,-1,-1,  -1,1,-1,  1,1,-1});   // v4-v7-v6-v5
 
   //normal array
  FloatBuffer normals = BufferUtils.createFloatBuffer(3 * 24).put(new float[] {0,0,1,  0,0,1,  0,0,1,  0,0,1,             // v0-v1-v2-v3
                     1,0,0,  1,0,0,  1,0,0, 1,0,0,              // v0-v3-v4-v5
                     0,1,0,  0,1,0,  0,1,0, 0,1,0,              // v0-v5-v6-v1
                     -1,0,0,  -1,0,0, -1,0,0,  -1,0,0,          // v1-v6-v7-v2
                     0,-1,0,  0,-1,0,  0,-1,0,  0,-1,0,         // v7-v4-v3-v2
                     0,0,-1,  0,0,-1,  0,0,-1,  0,0,-1});        // v4-v7-v6-v5
 
   //color array
  FloatBuffer colors = BufferUtils.createFloatBuffer(3 * 24).put(new float[] {1,1,1,  1,1,0,  1,0,0,  1,0,1,              // v0-v1-v2-v3
                    1,1,1,  1,0,1,  0,0,1,  0,1,1,              // v0-v3-v4-v5
                    1,1,1,  0,1,1,  0,1,0,  1,1,0,              // v0-v5-v6-v1
                    1,1,0,  0,1,0,  0,0,0,  1,0,0,              // v1-v6-v7-v2
                    0,0,0,  0,0,1,  1,0,1,  1,0,0,              // v7-v4-v3-v2
                    0,0,1,  0,0,0,  0,1,0,  0,1,1});             // v4-v7-v6-v5
 
   public TestModel() {
      vertexBufferID = createVBOID();
      System.out.println("VBO id: " + vertexBufferID);
      renderToVbo();
   }
   
   public static int createVBOID() {
      if (GLContext.getCapabilities().GL_ARB_vertex_buffer_object) {
         IntBuffer buffer = BufferUtils.createIntBuffer(1);
         ARBVertexBufferObject.glGenBuffersARB(buffer);
         return buffer.get(0);
      }
      return 0;
   }

        // Helper method
  public int sizeof(FloatBuffer fb) {
      return fb.capacity();
   }
   
   public void renderToVbo() {
     
     
      ARBVertexBufferObject.glBindBufferARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, vertexBufferID);
     
      ARBVertexBufferObject.glBufferDataARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, sizeof(vertices)+sizeof(normals)+sizeof(colors), ARBVertexBufferObject.GL_STATIC_DRAW_ARB);
      ARBVertexBufferObject.glBufferSubDataARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, 0, vertices);                             // copy vertices starting from 0 offest
     ARBVertexBufferObject.glBufferSubDataARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, sizeof(vertices), normals);                // copy normals after vertices
     ARBVertexBufferObject.glBufferSubDataARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, sizeof(vertices)+sizeof(normals), colors);  // copy colours after normals
     
   }

   
   @Override
   public void render() {

     
      ARBVertexBufferObject.glBindBufferARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, vertexBufferID);

      GL11.glEnableClientState(GL11.GL_NORMAL_ARRAY);
      GL11.glEnableClientState(GL11.GL_COLOR_ARRAY);
      GL11.glEnableClientState(GL11.GL_VERTEX_ARRAY);

      GL11.glNormalPointer(GL11.GL_FLOAT, 0, sizeof(vertices));
      GL11.glColorPointer(3, GL11.GL_FLOAT, 0, (sizeof(vertices)+sizeof(normals)));
      GL11.glVertexPointer(3, GL11.GL_FLOAT, 0, 0);

      GL11.glDrawArrays(GL11.GL_QUADS, 0, 24);
     
      GL11.glDisableClientState(GL11.GL_VERTEX_ARRAY);  // disable vertex arrays
     GL11.glDisableClientState(GL11.GL_COLOR_ARRAY);
      GL11.glDisableClientState(GL11.GL_NORMAL_ARRAY);

                ARBVertexBufferObject.glBindBufferARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, 0);

   }

}


To render it I simply use testModel.render()
Offline ra4king

JGO Kernel


Medals: 345
Projects: 2
Exp: 5 years


I'm the King!


« Reply #1 - Posted 2011-12-03 13:33:49 »

You didn't flip your buffers Wink

Offline Waterwolf

Junior Member


Medals: 3



« Reply #2 - Posted 2011-12-03 13:53:13 »

Okay solved this in IRC with assistance from ra4king and MatthiasM! In case someone in distant future reads this you need to flip the buffer as ra4king said and the VBO size must be in bytes.
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