protected void renderMultipassLighting(Shader shader, Geometry g, RenderManager rm) {
Renderer r = rm.getRenderer();
LightList lightList = g.getWorldLightList();
Uniform lightDir = shader.getUniform("g_LightDirection");
Uniform lightColor = shader.getUniform("g_LightColor");
Uniform lightPos = shader.getUniform("g_LightPosition");
Uniform ambientColor = shader.getUniform("g_AmbientLightColor");
boolean isFirstLight = true;
boolean isSecondLight = false;
for (int i = 0; i < lightList.size(); i++) {
Light l = lightList.get(i);
if (l instanceof AmbientLight) {
continue;
}
if (isFirstLight) {
// set ambient color for first light only
ambientColor.setValue(VarType.Vector4, getAmbientColor(lightList));
isFirstLight = false;
isSecondLight = true;
} else if (isSecondLight) {
ambientColor.setValue(VarType.Vector4, ColorRGBA.Black);
// apply additive blending for 2nd and future lights
r.applyRenderState(additiveLight);
isSecondLight = false;
}
TempVars vars = TempVars.get();
Quaternion tmpLightDirection = vars.quat1;
Quaternion tmpLightPosition = vars.quat2;
ColorRGBA tmpLightColor = vars.color;
Vector4f tmpVec = vars.vect4f;
ColorRGBA color = l.getColor();
tmpLightColor.set(color);
tmpLightColor.a = l.getType().getId();
lightColor.setValue(VarType.Vector4, tmpLightColor);
switch (l.getType()) {
case Directional:
DirectionalLight dl = (DirectionalLight) l;
Vector3f dir = dl.getDirection();
//FIXME : there is an inconstencie here due to backward
//compatibility of the lighting shader.
//The directional light direction is passed in the
//LightPosition uniform. The lightinf shader needs to be
//reworked though in order to fix this.
tmpLightPosition.set(dir.getX(), dir.getY(), dir.getZ(), -1);
lightPos.setValue(VarType.Vector4, tmpLightPosition);
tmpLightDirection.set(0, 0, 0, 0);
lightDir.setValue(VarType.Vector4, tmpLightDirection);
break;
case Point:
PointLight pl = (PointLight) l;
Vector3f pos = pl.getPosition();
float invRadius = pl.getInvRadius();
tmpLightPosition.set(pos.getX(), pos.getY(), pos.getZ(), invRadius);
lightPos.setValue(VarType.Vector4, tmpLightPosition);
tmpLightDirection.set(0, 0, 0, 0);
lightDir.setValue(VarType.Vector4, tmpLightDirection);
break;
case Spot:
SpotLight sl = (SpotLight) l;
Vector3f pos2 = sl.getPosition();
Vector3f dir2 = sl.getDirection();
float invRange = sl.getInvSpotRange();
float spotAngleCos = sl.getPackedAngleCos();
tmpLightPosition.set(pos2.getX(), pos2.getY(), pos2.getZ(), invRange);
lightPos.setValue(VarType.Vector4, tmpLightPosition);
//We transform the spot directoin in view space here to save 5 varying later in the lighting shader
//one vec4 less and a vec4 that becomes a vec3
//the downside is that spotAngleCos decoding happen now in the frag shader.
tmpVec.set(dir2.getX(), dir2.getY(), dir2.getZ(), 0);
rm.getCurrentCamera().getViewMatrix().mult(tmpVec, tmpVec);
tmpLightDirection.set(tmpVec.getX(), tmpVec.getY(), tmpVec.getZ(), spotAngleCos);
lightDir.setValue(VarType.Vector4, tmpLightDirection);
break;
default:
throw new UnsupportedOperationException("Unknown type of light: " + l.getType());
}
vars.release();
r.setShader(shader);
r.renderMesh(g.getMesh(), g.getLodLevel(), 1);
}
if (isFirstLight && lightList.size() > 0) {
// There are only ambient lights in the scene. Render
// a dummy "normal light" so we can see the ambient
ambientColor.setValue(VarType.Vector4, getAmbientColor(lightList));
lightColor.setValue(VarType.Vector4, ColorRGBA.BlackNoAlpha);
lightPos.setValue(VarType.Vector4, nullDirLight);
r.setShader(shader);
r.renderMesh(g.getMesh(), g.getLodLevel(), 1);
}