private ColorRGBA getAmbientColor(LightList lightList) {
ambientLightColor.set(0, 0, 0, 1);
for (int j = 0; j < lightList.size(); j++) {
Light l = lightList.get(j);
if (l instanceof AmbientLight) {
ambientLightColor.addLocal(l.getColor());
}
}
ambientLightColor.a = 1.0f;
return ambientLightColor;
}
public void setLighting(LightList list) {
// XXX: This is abuse of setLighting() to
// apply fixed function bindings
// and do other book keeping.
if (list == null || list.size() == 0) {
glDisable(GL_LIGHTING);
applyFixedFuncBindings(false);
setModelView(worldMatrix, viewMatrix);
return;
}
// Number of lights set previously
int numLightsSetPrev = lightList.size();
// If more than maxLights are defined, they will be ignored.
// The GL1 renderer is not permitted to crash due to a
// GL1 limitation. It must render anything that the GL2 renderer
// can render (even incorrectly).
lightList.clear();
materialAmbientColor.set(0, 0, 0, 0);
for (int i = 0; i < list.size(); i++) {
Light l = list.get(i);
if (l.getType() == Light.Type.Ambient) {
// Gather
materialAmbientColor.addLocal(l.getColor());
} else {
// Add to list
lightList.add(l);
// Once maximum lights reached, exit loop.
if (lightList.size() >= maxLights) {
break;
}
}
}
applyFixedFuncBindings(true);
glEnable(GL_LIGHTING);
fb16.clear();
fb16.put(materialAmbientColor.r)
.put(materialAmbientColor.g)
.put(materialAmbientColor.b)
.put(1)
.flip();
glLightModel(GL_LIGHT_MODEL_AMBIENT, fb16);
if (context.matrixMode != GL_MODELVIEW) {
glMatrixMode(GL_MODELVIEW);
context.matrixMode = GL_MODELVIEW;
}
// Lights are already in world space, so just convert
// them to view space.
glLoadMatrix(storeMatrix(viewMatrix, fb16));
for (int i = 0; i < lightList.size(); i++) {
int glLightIndex = GL_LIGHT0 + i;
Light light = lightList.get(i);
Light.Type lightType = light.getType();
ColorRGBA col = light.getColor();
Vector3f pos;
// Enable the light
glEnable(glLightIndex);
// OGL spec states default value for light ambient is black
switch (lightType) {
case Directional:
DirectionalLight dLight = (DirectionalLight) light;
fb16.clear();
fb16.put(col.r).put(col.g).put(col.b).put(col.a).flip();
glLight(glLightIndex, GL_DIFFUSE, fb16);
glLight(glLightIndex, GL_SPECULAR, fb16);
pos = tempVec.set(dLight.getDirection()).negateLocal().normalizeLocal();
fb16.clear();
fb16.put(pos.x).put(pos.y).put(pos.z).put(0.0f).flip();
glLight(glLightIndex, GL_POSITION, fb16);
glLightf(glLightIndex, GL_SPOT_CUTOFF, 180);
break;
case Point:
PointLight pLight = (PointLight) light;
fb16.clear();
fb16.put(col.r).put(col.g).put(col.b).put(col.a).flip();
glLight(glLightIndex, GL_DIFFUSE, fb16);
glLight(glLightIndex, GL_SPECULAR, fb16);
pos = pLight.getPosition();
fb16.clear();
fb16.put(pos.x).put(pos.y).put(pos.z).put(1.0f).flip();
glLight(glLightIndex, GL_POSITION, fb16);
glLightf(glLightIndex, GL_SPOT_CUTOFF, 180);
if (pLight.getRadius() > 0) {
// Note: this doesn't follow the same attenuation model
// as the one used in the lighting shader.
glLightf(glLightIndex, GL_CONSTANT_ATTENUATION, 1);
glLightf(glLightIndex, GL_LINEAR_ATTENUATION, pLight.getInvRadius() * 2);
glLightf(
glLightIndex,
GL_QUADRATIC_ATTENUATION,
pLight.getInvRadius() * pLight.getInvRadius());
} else {
glLightf(glLightIndex, GL_CONSTANT_ATTENUATION, 1);
glLightf(glLightIndex, GL_LINEAR_ATTENUATION, 0);
glLightf(glLightIndex, GL_QUADRATIC_ATTENUATION, 0);
}
break;
case Spot:
SpotLight sLight = (SpotLight) light;
fb16.clear();
fb16.put(col.r).put(col.g).put(col.b).put(col.a).flip();
glLight(glLightIndex, GL_DIFFUSE, fb16);
glLight(glLightIndex, GL_SPECULAR, fb16);
pos = sLight.getPosition();
fb16.clear();
fb16.put(pos.x).put(pos.y).put(pos.z).put(1.0f).flip();
glLight(glLightIndex, GL_POSITION, fb16);
Vector3f dir = sLight.getDirection();
fb16.clear();
fb16.put(dir.x).put(dir.y).put(dir.z).put(1.0f).flip();
glLight(glLightIndex, GL_SPOT_DIRECTION, fb16);
float outerAngleRad = sLight.getSpotOuterAngle();
float innerAngleRad = sLight.getSpotInnerAngle();
float spotCut = outerAngleRad * FastMath.RAD_TO_DEG;
float spotExpo = 0.0f;
if (outerAngleRad > 0) {
spotExpo = (1.0f - (innerAngleRad / outerAngleRad)) * 128.0f;
}
glLightf(glLightIndex, GL_SPOT_CUTOFF, spotCut);
glLightf(glLightIndex, GL_SPOT_EXPONENT, spotExpo);
if (sLight.getSpotRange() > 0) {
glLightf(glLightIndex, GL_LINEAR_ATTENUATION, sLight.getInvSpotRange());
} else {
glLightf(glLightIndex, GL_LINEAR_ATTENUATION, 0);
}
break;
default:
throw new UnsupportedOperationException("Unrecognized light type: " + lightType);
}
}
// Disable lights after the index
for (int i = lightList.size(); i < numLightsSetPrev; i++) {
glDisable(GL_LIGHT0 + i);
}
// This will set view matrix as well.
setModelView(worldMatrix, viewMatrix);
}
