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();
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);
}
}
/**
* Called by {@link RenderManager} to render the geometry by using this material.
*
* <p>The material is rendered as follows:
*
* <ul>
* <li>Determine which technique to use to render the material - either what the user selected
* via {@link #selectTechnique(java.lang.String, com.jme3.renderer.RenderManager)
* Material.selectTechnique()}, or the first default technique that the renderer supports
* (based on the technique's {@link TechniqueDef#getRequiredCaps() requested rendering
* capabilities})
* <ul>
* <li>If the technique has been changed since the last frame, then it is notified via
* {@link Technique#makeCurrent(com.jme3.asset.AssetManager, boolean,
* java.util.EnumSet) Technique.makeCurrent()}. If the technique wants to use a shader
* to render the model, it should load it at this part - the shader should have all
* the proper defines as declared in the technique definition, including those that
* are bound to material parameters. The technique can re-use the shader from the last
* frame if no changes to the defines occurred.
* </ul>
* <li>Set the {@link RenderState} to use for rendering. The render states are applied in this
* order (later RenderStates override earlier RenderStates):
* <ol>
* <li>{@link TechniqueDef#getRenderState() Technique Definition's RenderState} - i.e.
* specific renderstate that is required for the shader.
* <li>{@link #getAdditionalRenderState() Material Instance Additional RenderState} - i.e.
* ad-hoc renderstate set per model
* <li>{@link RenderManager#getForcedRenderState() RenderManager's Forced RenderState} -
* i.e. renderstate requested by a {@link com.jme3.post.SceneProcessor} or
* post-processing filter.
* </ol>
* <li>If the technique {@link TechniqueDef#isUsingShaders() uses a shader}, then the uniforms
* of the shader must be updated.
* <ul>
* <li>Uniforms bound to material parameters are updated based on the current material
* parameter values.
* <li>Uniforms bound to world parameters are updated from the RenderManager. Internally
* {@link UniformBindingManager} is used for this task.
* <li>Uniforms bound to textures will cause the texture to be uploaded as necessary. The
* uniform is set to the texture unit where the texture is bound.
* </ul>
* <li>If the technique uses a shader, the model is then rendered according to the lighting mode
* specified on the technique definition.
* <ul>
* <li>{@link LightMode#SinglePass single pass light mode} fills the shader's light
* uniform arrays with the first 4 lights and renders the model once.
* <li>{@link LightMode#MultiPass multi pass light mode} light mode renders the model
* multiple times, for the first light it is rendered opaque, on subsequent lights it
* is rendered with {@link BlendMode#AlphaAdditive alpha-additive} blending and depth
* writing disabled.
* </ul>
* <li>For techniques that do not use shaders, fixed function OpenGL is used to render the model
* (see {@link GL1Renderer} interface):
* <ul>
* <li>OpenGL state ({@link FixedFuncBinding}) that is bound to material parameters is
* updated.
* <li>The texture set on the material is uploaded and bound. Currently only 1 texture is
* supported for fixed function techniques.
* <li>If the technique uses lighting, then OpenGL lighting state is updated based on the
* light list on the geometry, otherwise OpenGL lighting is disabled.
* <li>The mesh is uploaded and rendered.
* </ul>
* </ul>
*
* @param geom The geometry to render
* @param rm The render manager requesting the rendering
*/
public void render(Geometry geom, RenderManager rm) {
autoSelectTechnique(rm);
Renderer r = rm.getRenderer();
TechniqueDef techDef = technique.getDef();
if (techDef.getLightMode() == LightMode.MultiPass && geom.getWorldLightList().size() == 0) {
return;
}
if (rm.getForcedRenderState() != null) {
r.applyRenderState(rm.getForcedRenderState());
} else {
if (techDef.getRenderState() != null) {
r.applyRenderState(
techDef.getRenderState().copyMergedTo(additionalState, mergedRenderState));
} else {
r.applyRenderState(RenderState.DEFAULT.copyMergedTo(additionalState, mergedRenderState));
}
}
// update camera and world matrices
// NOTE: setWorldTransform should have been called already
if (techDef.isUsingShaders()) {
// reset unchanged uniform flag
clearUniformsSetByCurrent(technique.getShader());
rm.updateUniformBindings(technique.getWorldBindUniforms());
}
// setup textures and uniforms
for (int i = 0; i < paramValues.size(); i++) {
MatParam param = paramValues.getValue(i);
param.apply(r, technique);
}
Shader shader = technique.getShader();
// send lighting information, if needed
switch (techDef.getLightMode()) {
case Disable:
r.setLighting(null);
break;
case SinglePass:
updateLightListUniforms(shader, geom, 4);
break;
case FixedPipeline:
r.setLighting(geom.getWorldLightList());
break;
case MultiPass:
// NOTE: Special case!
resetUniformsNotSetByCurrent(shader);
renderMultipassLighting(shader, geom, rm);
// very important, notice the return statement!
return;
}
// upload and bind shader
if (techDef.isUsingShaders()) {
// any unset uniforms will be set to 0
resetUniformsNotSetByCurrent(shader);
r.setShader(shader);
}
r.renderMesh(geom.getMesh(), geom.getLodLevel(), 1);
}