/**
* Draw a vertex buffer with texture coordinates in a given gl mode. Vertex buffers coming from the
* createShapeBuffer() methods support both <code>GL.GL_TRIANGLE_FAN</code> and <code>GL.LINE_STRIP</code>.
*
* @param dc the current DrawContext.
* @param mode the desired drawing GL mode.
* @param count the number of vertices to draw.
* @param verts the vertex buffer to draw.
* @param coords the buffer containing the shape texture coordinates.
*/
public static void drawBuffer(DrawContext dc, int mode, int count, DoubleBuffer verts, DoubleBuffer coords)
{
if (dc == null)
{
String message = Logging.getMessage("nullValue.DrawContextIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (verts == null || coords == null)
{
String message = Logging.getMessage("nullValue.BufferIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
GL2 gl = dc.getGL().getGL2(); // GL initialization checks for GL2 compatibility.
// Set up
gl.glPushClientAttrib(GL2.GL_CLIENT_VERTEX_ARRAY_BIT);
gl.glEnableClientState(GL2.GL_VERTEX_ARRAY);
gl.glEnableClientState(GL2.GL_TEXTURE_COORD_ARRAY);
gl.glVertexPointer(2, GL2.GL_DOUBLE, 0, verts);
gl.glTexCoordPointer(2, GL2.GL_DOUBLE, 0, coords);
// Draw
gl.glDrawArrays(mode, 0, count);
// Restore
gl.glPopClientAttrib();
}
/**
* Renders elements from the currently bounds OpenGL coordinate buffers. This behaves exactly like {@link
* #drawArrays(gov.nasa.worldwind.render.DrawContext, int)}, except that each sub-buffer is rendered independently.
* The specified drawMode indicates which type of OpenGL primitives to render.
*
* @param dc the current DrawContext.
* @param drawMode the type of OpenGL primtives to render.
*
* @throws ArgumentException if the DrawContext is null.
*/
public void multiDrawArrays(DrawContext dc, int drawMode)
{
if (dc == null)
{
String message = Logging.getMessage("nullValue.DrawContextIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
GL2 gl = dc.getGL().getGL2(); // GL initialization checks for GL2 compatibility.
if (this.haveMultiDrawArrays(dc))
{
gl.glMultiDrawArrays(drawMode, this.offsets, this.lengths, this.count);
}
else
{
for (int i = 0; i < this.count; i++)
{
gl.glDrawArrays(drawMode, this.offsets.get(i), this.lengths.get(i));
}
}
}
