Method copyVboData

src/main/java/net/optifine/render/VboRegion.java:203–214

(int posFrom, int posTo, int size)

    }

    private void copyVboData(int posFrom, int posTo, int size)
    {
        long i = this.toBytes(posFrom);
        long j = this.toBytes(posTo);
        long k = this.toBytes(size);
        OpenGlHelper.glBindBuffer(OpenGlHelper.GL_COPY_READ_BUFFER, this.glBufferId);
        OpenGlHelper.glBindBuffer(OpenGlHelper.GL_COPY_WRITE_BUFFER, this.glBufferId);
        OpenGlHelper.glCopyBufferSubData(OpenGlHelper.GL_COPY_READ_BUFFER, OpenGlHelper.GL_COPY_WRITE_BUFFER, i, j, k);
        Config.checkGlError("Copy VBO range");
        OpenGlHelper.glBindBuffer(OpenGlHelper.GL_COPY_READ_BUFFER, 0);
        OpenGlHelper.glBindBuffer(OpenGlHelper.GL_COPY_WRITE_BUFFER, 0);
    }

    private void expandVbo(int sizeMin)
    {