/**
* Uploads the lights in the light list as two uniform arrays.<br>
* <br>
* *
*
* <p><code>uniform vec4 g_LightColor[numLights];</code><br>
* // g_LightColor.rgb is the diffuse/specular color of the light.<br>
* // g_Lightcolor.a is the type of light, 0 = Directional, 1 = Point, <br>
* // 2 = Spot. <br>
* <br>
* <code>uniform vec4 g_LightPosition[numLights];</code><br>
* // g_LightPosition.xyz is the position of the light (for point lights)<br>
* // or the direction of the light (for directional lights).<br>
* // g_LightPosition.w is the inverse radius (1/r) of the light (for attenuation) <br>
*/
protected void updateLightListUniforms(Shader shader, Geometry g, int numLights) {
if (numLights == 0) { // this shader does not do lighting, ignore.
return;
}
LightList lightList = g.getWorldLightList();
Uniform lightColor = shader.getUniform("g_LightColor");
Uniform lightPos = shader.getUniform("g_LightPosition");
Uniform lightDir = shader.getUniform("g_LightDirection");
lightColor.setVector4Length(numLights);
lightPos.setVector4Length(numLights);
lightDir.setVector4Length(numLights);
Uniform ambientColor = shader.getUniform("g_AmbientLightColor");
ambientColor.setValue(VarType.Vector4, getAmbientColor(lightList));
int lightIndex = 0;
for (int i = 0; i < numLights; i++) {
if (lightList.size() <= i) {
lightColor.setVector4InArray(0f, 0f, 0f, 0f, lightIndex);
lightPos.setVector4InArray(0f, 0f, 0f, 0f, lightIndex);
} else {
Light l = lightList.get(i);
ColorRGBA color = l.getColor();
lightColor.setVector4InArray(
color.getRed(), color.getGreen(), color.getBlue(), l.getType().getId(), i);
switch (l.getType()) {
case Directional:
DirectionalLight dl = (DirectionalLight) l;
Vector3f dir = dl.getDirection();
lightPos.setVector4InArray(dir.getX(), dir.getY(), dir.getZ(), -1, lightIndex);
break;
case Point:
PointLight pl = (PointLight) l;
Vector3f pos = pl.getPosition();
float invRadius = pl.getInvRadius();
lightPos.setVector4InArray(pos.getX(), pos.getY(), pos.getZ(), invRadius, lightIndex);
break;
case Spot:
SpotLight sl = (SpotLight) l;
Vector3f pos2 = sl.getPosition();
Vector3f dir2 = sl.getDirection();
float invRange = sl.getInvSpotRange();
float spotAngleCos = sl.getPackedAngleCos();
lightPos.setVector4InArray(pos2.getX(), pos2.getY(), pos2.getZ(), invRange, lightIndex);
lightDir.setVector4InArray(
dir2.getX(), dir2.getY(), dir2.getZ(), spotAngleCos, lightIndex);
break;
case Ambient:
// skip this light. Does not increase lightIndex
continue;
default:
throw new UnsupportedOperationException("Unknown type of light: " + l.getType());
}
}
lightIndex++;
}
while (lightIndex < numLights) {
lightColor.setVector4InArray(0f, 0f, 0f, 0f, lightIndex);
lightPos.setVector4InArray(0f, 0f, 0f, 0f, lightIndex);
lightIndex++;
}
}
