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Add support for screen-space contact shadows (#2245)

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* Add support for screen-space contact shadows

This CL adds support and always enables it.
toggles and setting in the next CL (same PR).

* Plumb settings for screen-space contact shadows

screen-space contact shadows is handled like a shadow option,
parameters (including on/off) are set in the LightManager, using
the existing ShadowOptions API.

Additionally there is a per-renderable toggle.

Both toggles are off by default.

* Allow contact shadows when shadowing is auto-disabled


Shadowing can be auto-disabled when for instance there are no
shadow casters in the scene. We still allow contact shadows in
that case.

This would allow for instance, to make the vegetation on a terrain
not shadow-casting, and still get some shadowing there by using
contact shadows instead.

* apply micro-shadowing after contact shadows

also, don't compute contact shadows when we know we're fully shadowed.
This commit is contained in:
Mathias Agopian
2020-03-16 22:39:24 -07:00
committed by GitHub
parent 6cf3e86c8a
commit d54ceff7a3
25 changed files with 288 additions and 33 deletions
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8
android/filament-android/src/main/cpp/LightManager.cpp
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@@ -66,7 +66,8 @@ Java_com_google_android_filament_LightManager_nBuilderCastShadows(JNIEnv*, jclas
extern "C" JNIEXPORT void JNICALL
Java_com_google_android_filament_LightManager_nBuilderShadowOptions(JNIEnv*, jclass,
jlong nativeBuilder, jint mapSize, jfloat constantBias, jfloat normalBias, jfloat shadowFar,
jfloat shadowNearHint, jfloat shadowFarHint, jboolean stable) {
jfloat shadowNearHint, jfloat shadowFarHint, jboolean stable,
jboolean screenSpaceContactShadows, jint stepCount, jfloat maxShadowDistance) {
LightManager::Builder *builder = (LightManager::Builder *) nativeBuilder;
builder->shadowOptions(
LightManager::ShadowOptions{.mapSize = (uint32_t)mapSize,
@@ -75,7 +76,10 @@ Java_com_google_android_filament_LightManager_nBuilderShadowOptions(JNIEnv*, jcl
.shadowFar = shadowFar,
.shadowNearHint = shadowNearHint,
.shadowFarHint = shadowFarHint,
.stable = (bool)stable});
.stable = (bool)stable,
.screenSpaceContactShadows = (bool)screenSpaceContactShadows,
.stepCount = uint8_t(stepCount),
.maxShadowDistance = maxShadowDistance});
}
extern "C" JNIEXPORT void JNICALL