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POHow to dynamically edit VBO's on the fly
 

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  1. POHow to dynamically edit VBO's on the fly
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    <p>I am looking for a way to dynamically edit the data that displays for a vertex buffer object. I have tried glBufferSubData, glMapBuffer, glBufferData, and some others, however had no luck. I have found that the time consuming method is glBindBuffer. I think I am using VBOs right, but I am not completely sure. Heres some sample code of my problem:</p> <pre><code> verticesId = glGenBuffers(); glBindBuffer(GL_ARRAY_BUFFER, verticesId); glBufferData(GL_ARRAY_BUFFER, verticesBuffer, GL_STREAM_DRAW); glBindBuffer(GL_ARRAY_BUFFER, 0); normalsId = glGenBuffers(); glBindBuffer(GL_ARRAY_BUFFER, normalsId); glBufferData(GL_ARRAY_BUFFER, normalsBuffer, GL_STREAM_DRAW); glBindBuffer(GL_ARRAY_BUFFER, 0); texturesId = glGenBuffers(); glBindBuffer(GL_ARRAY_BUFFER, texturesId); glBufferData(GL_ARRAY_BUFFER, texturesBuffer, GL_STREAM_DRAW); glBindBuffer(GL_ARRAY_BUFFER, 0); </code></pre> <p>the verticesBuffer and other variables are the FloatBuffers that have the data in them. Next, I render them this way:</p> <pre><code> glEnableClientState(GL_VERTEX_ARRAY); glBindBuffer(GL_ARRAY_BUFFER, verticesId); glVertexPointer(vertexSize, GL_FLOAT, 0, 0); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glBindBuffer(GL_ARRAY_BUFFER, texturesId); glTexCoordPointer(2, GL_FLOAT, 0, 0); glDrawArrays(GL_QUADS, 0, amountOfVertices); glDisableClientState(GL_TEXTURE_COORD_ARRAY); glDisableClientState(GL_VERTEX_ARRAY); </code></pre> <p>Here is how I edit the VBOs:</p> <pre><code> int position = 0; /////////////////////////////////////////////////////////////////// glBindBuffer(GL_ARRAY_BUFFER, verticesId); mapBuffer = glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY, null); verticesBuffer = mapBuffer.order(ByteOrder.nativeOrder()).asFloatBuffer(); verticesBuffer.position(position); // ... edit some values in the 'vertices' float array ... verticesBuffer.put(vertices); verticesBuffer.rewind(); glUnmapBuffer(GL_ARRAY_BUFFER); glBindBuffer(GL_ARRAY_BUFFER, 0); </code></pre> <p>Is there any way to speed up the glBindBuffer method, or am I doing this wrong? And also, how should I edit the data for the most efficiency.</p>
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    1. USBraden Steffaniak
    1. USBraden Steffaniak
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      1. POHow to dynamically edit VBO's on the fly
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    1. COcan you provide some code where you actually change those VBOs? or maybe you recreate them every frame?
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      1. USfen
    2. COSorry its a little vague. I am trying to get only the parts I need out of some big code.
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      1. USBraden Steffaniak
 

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