Function mainLoop

src/examples/external_shader/external_shader.cpp:90–198

using namespace Demo_ExternalShader;

void mainLoop() {
	win->clear();

	imp->update();

	if ( imp->isKeyDown( KEY_ESCAPE ) ) {
		win->close();
	}

	if ( imp->isKeyUp( KEY_F ) ) {
		if ( win->isWindowed() ) {
			win->setSize( win->getDesktopResolution().getWidth(),
						  win->getDesktopResolution().getHeight(), false );
		} else {
			win->setSize( 960, 640, true );
			win->centerToDisplay();
		}
	}

	Float p;
	Vector2f mf = imp->getMousePos().asFloat();
	Float tratio = tw / th;
	Float touchX = ( mf.x / tw - 1 ) * tratio;
	Float touchY = -( mf.y / th - 1 );
	bool touch = imp->isMouseLeftPressed();

	for ( Uint32 i = 0; i < ParticlesNum; i += 2 ) {
		// copy old positions
		vertices[i].x = vertices[i + 1].x;
		vertices[i].y = vertices[i + 1].y;

		// inertia
		velocities[i].x *= velocities[i].z;
		velocities[i].y *= velocities[i].z;

		// horizontal
		p = vertices[i + 1].x;
		p += velocities[i].x;

		if ( p < -aspectRatio ) {
			p = -aspectRatio;
			velocities[i].x = eeabs( velocities[i].x );
		} else if ( p > aspectRatio ) {
			p = aspectRatio;
			velocities[i].x = -eeabs( velocities[i].x );
		}
		vertices[i + 1].x = p;

		// vertical
		p = vertices[i + 1].y;
		p += velocities[i].y;
		if ( p < -aspectRatio ) {
			p = -aspectRatio;
			velocities[i].y = eeabs( velocities[i].y );
		} else if ( p > aspectRatio ) {
			p = aspectRatio;
			velocities[i].y = -eeabs( velocities[i].y );
		}