private GTexture getTexture() {
if (_texture == null) {
_texture = initializeTexture();
if ((_texture == null) || !_texture.hasGLTexture()) {
return null;
}
_textureWidth = _texture.getWidth();
_textureHeight = _texture.getHeight();
}
return _texture;
}
@Override
public void render(final DrawContext dc) {
// _lastDC = dc;
runFrameWorkers();
final GTexture texture = getTexture();
if ((texture == null) || !texture.hasGLTexture()) {
return;
}
final GL gl = dc.getGL();
gl.glPushAttrib(
GL.GL_DEPTH_BUFFER_BIT
| GL.GL_COLOR_BUFFER_BIT
| GL.GL_ENABLE_BIT
| GL.GL_TEXTURE_BIT
| GL.GL_TRANSFORM_BIT
| GL.GL_VIEWPORT_BIT
| GL.GL_CURRENT_BIT);
gl.glEnable(GL.GL_BLEND);
gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);
gl.glDisable(GL.GL_DEPTH_TEST);
// Load a parallel projection with xy dimensions (viewportWidth, viewportHeight)
// into the GL projection matrix.
final Rectangle viewport = dc.getView().getViewport();
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glPushMatrix();
gl.glLoadIdentity();
final double maxwh = Math.max(_textureWidth, _textureHeight);
gl.glOrtho(0d, viewport.width, 0d, viewport.height, -0.6 * maxwh, 0.6 * maxwh);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glPushMatrix();
gl.glLoadIdentity();
// Translate and scale
final float scale = computeScale(viewport);
final Vec4 locationSW = computeLocation(viewport, scale);
gl.glTranslated(locationSW.x(), locationSW.y(), locationSW.z());
// Scale to 0..1 space
gl.glScalef(scale, scale, 1f);
gl.glScaled(_textureWidth, _textureHeight, 1d);
_lastScreenBounds = calculateScreenBounds(viewport, locationSW, scale);
texture.enable();
texture.bind();
gl.glTexEnvf(GL.GL_TEXTURE_ENV, GL.GL_TEXTURE_ENV_MODE, GL.GL_MODULATE);
gl.glColor4f(1, 1, 1, calculateOpacity());
dc.drawUnitQuad(texture.getImageTexCoords());
texture.disable();
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glPopMatrix();
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glPopMatrix();
gl.glPopAttrib();
}