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Author: AppleSauce (posted 2014-07-08 19:25:32, viewed 206 times)

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public class VertexBufferObjectDemo {

    public static void main(String[] args) {
        try {
            Display.setDisplayMode(new DisplayMode(640, 480));
            Display.setTitle("Vertex Buffer Object Demo");
            Display.create();
        } catch (LWJGLException e) {
            e.printStackTrace();
            Display.destroy();
            System.exit(1);
        }

        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        glOrtho(1, -1, 1, -1, 1, -1);
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();

        final int amountOfVertices = 3;
        final int vertexSize = 3;
        final int colorSize = 3;
        
        float trans = 0.1f;
        
        FloatBuffer vertexData = BufferUtils.createFloatBuffer(amountOfVertices * vertexSize);
        vertexData.put(new float[]{-0.5f + trans, -0.5f, 0, 0.5f + trans, -0.5f, 0, 0.5f + trans, 0.5f, 0});
        vertexData.flip();

        FloatBuffer colorData = BufferUtils.createFloatBuffer(amountOfVertices * colorSize);
        colorData.put(new float[]{1, 0, 0, 0, 1, 0, 0, 0, 1/**/});
        colorData.flip();

        int vboVertexHandle = glGenBuffers();
        glBindBuffer(GL_ARRAY_BUFFER, vboVertexHandle);
        glBufferData(GL_ARRAY_BUFFER, vertexData, GL_DYNAMIC_DRAW);
        glBindBuffer(GL_ARRAY_BUFFER, 0);

        int vboColorHandle = glGenBuffers();
        glBindBuffer(GL_ARRAY_BUFFER, vboColorHandle);
        glBufferData(GL_ARRAY_BUFFER, colorData, GL_DYNAMIC_DRAW);
        glBindBuffer(GL_ARRAY_BUFFER, 0);

        while (!Display.isCloseRequested()) {
            glClear(GL_COLOR_BUFFER_BIT);
            
            
            //attempt to move triangle
            trans += 0.1f;
            
            
            glBufferData(GL_ARRAY_BUFFER, vertexData, GL_DYNAMIC_DRAW);
            
            vertexData.clear();

            
            
            //GL11.glTranslatef(0.001f, 0, 0);
            glBindBuffer(GL_ARRAY_BUFFER, vboVertexHandle);
            glVertexPointer(vertexSize, GL_FLOAT, 0, 0L);

            glBindBuffer(GL_ARRAY_BUFFER, vboColorHandle);
            glColorPointer(colorSize, GL_FLOAT, 0, 0L);

            glEnableClientState(GL_VERTEX_ARRAY);
            glEnableClientState(GL_COLOR_ARRAY); 
            glDrawArrays(GL_TRIANGLES, 0, amountOfVertices);
            glDisableClientState(GL_COLOR_ARRAY);
            glDisableClientState(GL_VERTEX_ARRAY);

            Display.update();
            Display.sync(60);
        }

        glDeleteBuffers(vboVertexHandle);
        glDeleteBuffers(vboColorHandle);

        Display.destroy();
        System.exit(0);
    }
}





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