WIP on clouds testing

src/interface/commandline/tests.cpp

@@ -559,6 +559,31 @@ static void testCloudModels() {
     }
 }
 
+static void testCloudsComponents() {
+    Scenery scenery;
+    scenery.autoPreset(2);
+    scenery.getTerrain()->propHeightNoise()->setConfig(0.0);
+    scenery.getCamera()->setLocation(Vector3(0.0, 1.0, 0.0));
+    scenery.getCamera()->setTarget(Vector3(0.0, 2.0, -1.0));
+    scenery.getCamera()->setFov(Maths::PI_2);
+
+    scenery.getClouds()->clear();
+    scenery.getClouds()->addLayer("test");
+    auto layer = scenery.getClouds()->getCloudLayer(0);
+    layer->type = CloudLayerDefinition::STRATOCUMULUS;
+    layer->coverage = 0.7;
+    layer->validate();
+
+    SoftwareCanvasRenderer renderer(&scenery);
+    renderer.setSize(800, 600);
+    renderer.getGodRaysSampler()->setEnabled(false);
+    renderer.setQuality(0.5);
+
+    startTestRender(&renderer, "clouds_component", 0);
+    // TODO Remove detail
+    // TODO Remove shadows
+}
+
 static void testCanvasAliasing() {
     class FakeRasterizer : public OverlayRasterizer {
       public:
@@ -590,6 +615,7 @@ void runTestSuite() {
 //    testCelestialBodies();
 //    testNearFrustum();
 //    testCloudsLighting();
+    testCloudsComponents();
     testCloudModels();
 //    testCloudsNearGround();
 //    testVegetationModels();

src/render/software/CloudsRenderer.cpp

@@ -98,6 +98,18 @@ BaseCloudsModel *CloudsRenderer::getLayerModel(unsigned int layer) {
     }
 }
 
+void CloudsRenderer::setLayerRenderer(unsigned int layer, BaseCloudLayerRenderer *renderer, bool delete_old) {
+    if (layer < layer_renderers.size()) {
+        if (delete_old) {
+            delete layer_renderers[layer];
+        }
+        layer_renderers[layer] = renderer;
+    } else {
+        Logs::warning("Software.Clouds") << "Asked to set an unknown layer model" << layer << endl;
+        delete renderer;
+    }
+}
+
 void CloudsRenderer::setLayerModel(unsigned int layer, BaseCloudsModel *model, bool delete_old) {
     if (layer < layer_models.size()) {
         if (delete_old) {

src/render/software/CloudsRenderer.h

@@ -50,7 +50,15 @@ class SOFTWARESHARED_EXPORT CloudsRenderer : public LightFilter {
     virtual BaseCloudsModel *getLayerModel(unsigned int layer);
 
     /**
-     * Override de default density model for a given layer.
+     * Override the default renderer for a given layer.
+     *
+     * This must be called after each update().
+     * Ownership of the renderer is taken.
+     */
+    virtual void setLayerRenderer(unsigned int layer, BaseCloudLayerRenderer *renderer, bool delete_old = true);
+
+    /**
+     * Override the default density model for a given layer.
      *
      * This must be called after each update().
      * Ownership of the model is taken.

src/render/software/clouds/BaseCloudsModel.cpp

@@ -30,14 +30,14 @@ BaseCloudsModel::CloudDensityInfo BaseCloudsModel::getDensity(const Vector3 &, d
     return {0.0, 1.0};
 }
 
-static inline Vector3 _getPseudoNormal(const BaseCloudsModel *model, const Vector3 &base, const Vector3 &direction, double base_density, double precision) {
+static inline Vector3 _getPseudoNormal(const BaseCloudsModel *model, const Vector3 &base, const Vector3 &direction,
+                                       double base_density, double precision) {
     double density = model->getDensity(base.add(direction.scale(precision * 10.0)), precision).density;
     double diff = base_density - density;
     return direction.scale(diff > 0.0 ? diff : 0.0);
 }
 
-Vector3 BaseCloudsModel::getNormal(const Vector3 &location) const
-{
+Vector3 BaseCloudsModel::getNormal(const Vector3 &location) const {
     double precision = 0.3;
     Vector3 normal = VECTOR_ZERO;
     double base_density = getDensity(location, precision).density;
@@ -47,5 +47,9 @@ Vector3 BaseCloudsModel::getNormal(const Vector3 &location) const
     normal = normal.add(_getPseudoNormal(this, location, VECTOR_WEST, base_density, precision));
     normal = normal.add(_getPseudoNormal(this, location, VECTOR_NORTH, base_density, precision));
     normal = normal.add(_getPseudoNormal(this, location, VECTOR_SOUTH, base_density, precision));
-    return normal.normalize().scale(Maths::smoothstep(0.0, 1.0, normal.getNorm()));
+    return normal.normalize().scale(Maths::smoothstep(0.0, 0.1, normal.getNorm()));
+}
+
+double BaseCloudsModel::getDetailValue(const Vector3 &, double, double) const {
+    return 0.0;
 }

src/render/software/clouds/BaseCloudsModel.h

@@ -44,6 +44,14 @@ class SOFTWARESHARED_EXPORT BaseCloudsModel {
      */
     Vector3 getNormal(const Vector3 &location) const;
 
+    /**
+     * Get the presence of clouds, at a detail level, given a density factor.
+     *
+     * The detail value is assumed to have a continuous derivative.
+     * To do so, it may return negative-or-zero values for non-presence.
+     */
+    virtual double getDetailValue(const Vector3 &location, double density, double quality) const;
+
   protected:
     CloudLayerDefinition *layer;
 };