/**
* Preloads this material for the given render manager.
*
* <p>Preloading the material can ensure that when the material is first used for rendering, there
* won't be any delay since the material has been already been setup for rendering.
*
* @param rm The render manager to preload for
*/
public void preload(RenderManager rm) {
autoSelectTechnique(rm);
Renderer r = rm.getRenderer();
TechniqueDef techDef = technique.getDef();
Collection<MatParam> params = paramValues.values();
for (MatParam param : params) {
if (param instanceof MatParamTexture) {
MatParamTexture texParam = (MatParamTexture) param;
r.setTexture(0, texParam.getTextureValue());
} else {
if (!techDef.isUsingShaders()) {
continue;
}
technique.updateUniformParam(param.getName(), param.getVarType(), param.getValue());
}
}
Shader shader = technique.getShader();
if (techDef.isUsingShaders()) {
r.setShader(shader);
}
}
/**
* Select the technique to use for rendering this material.
*
* <p>If <code>name</code> is "Default", then one of the {@link MaterialDef#getDefaultTechniques()
* default techniques} on the material will be selected. Otherwise, the named technique will be
* found in the material definition.
*
* <p>Any candidate technique for selection (either default or named) must be verified to be
* compatible with the system, for that, the <code>renderManager</code> is queried for
* capabilities.
*
* @param name The name of the technique to select, pass "Default" to select one of the default
* techniques.
* @param renderManager The {@link RenderManager render manager} to query for capabilities.
* @throws IllegalArgumentException If "Default" is passed and no default techniques are available
* on the material definition, or if a name is passed but there's no technique by that name.
* @throws UnsupportedOperationException If no candidate technique supports the system
* capabilities.
*/
public void selectTechnique(String name, RenderManager renderManager) {
// check if already created
Technique tech = techniques.get(name);
// When choosing technique, we choose one that
// supports all the caps.
EnumSet<Caps> rendererCaps = renderManager.getRenderer().getCaps();
if (tech == null) {
if (name.equals("Default")) {
List<TechniqueDef> techDefs = def.getDefaultTechniques();
if (techDefs == null || techDefs.isEmpty()) {
throw new IllegalArgumentException(
"No default techniques are available on material '" + def.getName() + "'");
}
TechniqueDef lastTech = null;
for (TechniqueDef techDef : techDefs) {
if (rendererCaps.containsAll(techDef.getRequiredCaps())) {
// use the first one that supports all the caps
tech = new Technique(this, techDef);
techniques.put(name, tech);
break;
}
lastTech = techDef;
}
if (tech == null) {
throw new UnsupportedOperationException(
"No default technique on material '"
+ def.getName()
+ "'\n"
+ " is supported by the video hardware. The caps "
+ lastTech.getRequiredCaps()
+ " are required.");
}
} else {
// create "special" technique instance
TechniqueDef techDef = def.getTechniqueDef(name);
if (techDef == null) {
throw new IllegalArgumentException(
"For material " + def.getName() + ", technique not found: " + name);
}
if (!rendererCaps.containsAll(techDef.getRequiredCaps())) {
throw new UnsupportedOperationException(
"The explicitly chosen technique '"
+ name
+ "' on material '"
+ def.getName()
+ "'\n"
+ "requires caps "
+ techDef.getRequiredCaps()
+ " which are not "
+ "supported by the video renderer");
}
tech = new Technique(this, techDef);
techniques.put(name, tech);
}
} else if (technique == tech) {
// attempting to switch to an already
// active technique.
return;
}
technique = tech;
tech.makeCurrent(def.getAssetManager(), true, rendererCaps);
// shader was changed
sortingId = -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);
}