paysages : Textures refactoring and improving (WIP).

git-svn-id: https://subversion.assembla.com/svn/thunderk/paysages@545 b1fd45b6-86a6-48da-8261-f70d1f35bdcc

TODO

@@ -7,7 +7,6 @@ Technology Preview 2 :
    => Restore cloud lighting
    => Improve cloud rendering precision (and beware of precision discontinuity when rendering clouds in front of ground (shorter distance)).
 - Improve textures (current model is greatly incorrect).
-   => Convert to new architecture model.
    => Use triplanar projection.
    => Separate models (basic texture and covering texture).
    => Covering texture height should inpact terrain height.

gui_qt/formrender.cpp

@@ -75,11 +75,10 @@ private:
     static AtmosphereResult _applyAerialPerspective(Renderer*, Vector3, Color base)
     {
         AtmosphereResult result;
+        atmosphereInitResult(&result);
         result.base = base;
-        result.distance = 0.0;
-        result.inscattering = COLOR_BLACK;
-        result.attenuation = COLOR_BLACK;
         result.final = base;
+        atmosphereUpdateResult(&result);
         return result;
     }
 };

gui_qt/widgetexplorer.cpp

@@ -53,6 +53,16 @@ static Vector3 _getCameraLocation(Renderer* renderer, Vector3)
     return ((CameraDefinition*)renderer->customData[2])->location;
 }
 
+static AtmosphereResult _applyAerialPerspective(Renderer*, Vector3, Color base)
+{
+    AtmosphereResult result;
+    atmosphereInitResult(&result);
+    result.base = base;
+    result.final = base;
+    atmosphereUpdateResult(&result);
+    return result;
+}
+
 WidgetExplorer::WidgetExplorer(QWidget *parent, CameraDefinition* camera):
     QGLWidget(parent)
 {
@@ -66,6 +76,7 @@ WidgetExplorer::WidgetExplorer(QWidget *parent, CameraDefinition* camera):
     _renderer->render_quality = 3;
     _renderer->customData[2] = _base_camera;
     _renderer->getCameraLocation = _getCameraLocation;
+    _renderer->atmosphere->applyAerialPerspective = _applyAerialPerspective;
     lightingManagerDisableSpecularity(_renderer->lighting);
 
     _inited = false;

lib_paysages/terrain/main.c

@@ -116,17 +116,96 @@ static TerrainResult _fakeGetResult(Renderer* renderer, double x, double z, int
     return result;
 }
 
+static inline Vector3 _getNormal4(Vector3 center, Vector3 north, Vector3 east, Vector3 south, Vector3 west)
+{
+    Vector3 dnorth, deast, dsouth, dwest, normal;
+
+    dnorth = v3Sub(north, center);
+    deast = v3Sub(east, center);
+    dsouth = v3Sub(south, center);
+    dwest = v3Sub(west, center);
+
+    normal = v3Cross(deast, dnorth);
+    normal = v3Add(normal, v3Cross(dsouth, deast));
+    normal = v3Add(normal, v3Cross(dwest, dsouth));
+    normal = v3Add(normal, v3Cross(dnorth, dwest));
+
+    return v3Normalize(normal);
+}
+
+static inline Vector3 _getNormal2(Vector3 center, Vector3 east, Vector3 south)
+{
+    return v3Normalize(v3Cross(v3Sub(south, center), v3Sub(east, center)));
+}
+
 static TerrainResult _realGetResult(Renderer* renderer, double x, double z, int with_painting, int with_textures)
 {
     TerrainResult result;
+    double detail = 0.01;
 
-    result.location.x = x;
-    result.location.y = renderer->terrain->getHeight(renderer, x, z, with_painting);
-    result.location.z = z;
+    /* Normal */
+    Vector3 center, north, east, south, west;
 
+    center.x = x;
+    center.z = z;
+    center.y = renderer->terrain->getHeight(renderer, center.x, center.z, with_painting);
+
+    east.x = x + detail;
+    east.z = z;
+    east.y = renderer->terrain->getHeight(renderer, east.x, east.z, with_painting);
+
+    south.x = x;
+    south.z = z + detail;
+    south.y = renderer->terrain->getHeight(renderer, south.x, south.z, with_painting);
+
+    if (renderer->render_quality > 5)
+    {
+        west.x = x - detail;
+        west.z = z;
+        west.y = renderer->terrain->getHeight(renderer, west.x, west.z, with_painting);
+
+        north.x = x;
+        north.z = z - detail;
+        north.y = renderer->terrain->getHeight(renderer, north.x, north.z, with_painting);
+
+        result.normal = _getNormal4(center, north, east, south, west);
+    }
+    else
+    {
+        result.normal = _getNormal2(center, east, south);
+    }
+
+    /* Location */
+    result.location = center;
+
+    /* Texture displacement */
     if (with_textures)
     {
-        result = renderer->textures->displaceTerrain(renderer, result);
+        center = result.location = renderer->textures->displaceTerrain(renderer, result);
+
+        /* TODO Recompute normal */
+        if (renderer->render_quality > 7)
+        {
+            /* Use 5 points on displaced terrain */
+            east = renderer->textures->displaceTerrain(renderer, _realGetResult(renderer, east.x, east.z, with_painting, 0));
+            south = renderer->textures->displaceTerrain(renderer, _realGetResult(renderer, south.x, south.z, with_painting, 0));
+            west = renderer->textures->displaceTerrain(renderer, _realGetResult(renderer, west.x, west.z, with_painting, 0));
+            north = renderer->textures->displaceTerrain(renderer, _realGetResult(renderer, north.x, north.z, with_painting, 0));
+
+            result.normal = _getNormal4(center, north, east, south, west);
+        }
+        else if (renderer->render_quality > 2)
+        {
+            /* Use 3 points on displaced terrain */
+            east = renderer->textures->displaceTerrain(renderer, _realGetResult(renderer, east.x, east.z, with_painting, 0));
+            south = renderer->textures->displaceTerrain(renderer, _realGetResult(renderer, south.x, south.z, with_painting, 0));
+
+            result.normal = _getNormal2(center, east, south);
+        }
+        else
+        {
+            /* Use texture noise directly, as if terrain was a plane */
+        }
     }
 
     return result;
@@ -140,10 +219,10 @@ static Color _fakeGetFinalColor(Renderer* renderer, Vector3 location, double pre
     return COLOR_GREEN;
 }
 
-static Color _realgetFinalColor(Renderer* renderer, Vector3 location, double precision)
+static Color _realGetFinalColor(Renderer* renderer, Vector3 location, double precision)
 {
-    TerrainResult terrain = renderer->terrain->getResult(renderer, location.x, location.z, 1, 1);
-    TexturesResult textures = renderer->textures->applyToTerrain(renderer, terrain);
+    /* TODO Restore precision control */
+    TexturesResult textures = renderer->textures->applyToTerrain(renderer, location.x, location.z);
     return renderer->applyMediumTraversal(renderer, textures.final_location, textures.final_color);
 }
 
@@ -192,7 +271,7 @@ static RayCastingResult _realCastRay(Renderer* renderer, Vector3 start, Vector3
             }
             result.hit = 1;
             result.hit_location = start;
-            result.hit_color = _realgetFinalColor(renderer, start, renderer->getPrecision(renderer, result.hit_location));
+            result.hit_color = _realGetFinalColor(renderer, start, renderer->getPrecision(renderer, result.hit_location));
             return result;
         }
 
@@ -350,7 +429,7 @@ static void _bindRenderer(Renderer* renderer, TerrainDefinition* definition)
     renderer->terrain->castRay = _realCastRay;
     renderer->terrain->getHeight = _realGetHeight;
     renderer->terrain->getResult = _realGetResult;
-    renderer->terrain->getFinalColor = _realgetFinalColor;
+    renderer->terrain->getFinalColor = _realGetFinalColor;
 
     lightingManagerRegisterFilter(renderer->lighting, (FuncLightingAlterLight)_alterLight, renderer);
 }

lib_paysages/textures/definition.c

@@ -77,6 +77,8 @@ static TexturesLayerDefinition* _layerCreateDefinition()
 
     result->_displacement_noise = noiseCreateGenerator();
 
+    _layerValidateDefinition(result);
+
     return result;
 }
 

lib_paysages/textures/presets.c

@@ -2,15 +2,17 @@
 
 void texturesAutoPreset(TexturesDefinition* definition, TexturesPreset preset)
 {
+    int layer;
     layersClear(definition->layers);
 
     if (preset == TEXTURES_PRESET_IRELAND)
     {
+        layer = layersAddLayer(definition->layers, NULL);
     }
-    else if (preset == TEXTURES_PRESET_IRELAND)
+    else if (preset == TEXTURES_PRESET_ALPS)
     {
     }
-    else if (preset == TEXTURES_PRESET_IRELAND)
+    else if (preset == TEXTURES_PRESET_CANYON)
     {
     }
 }
@@ -33,7 +35,7 @@ void texturesLayerAutoPreset(TexturesLayerDefinition* definition, TexturesLayerP
             break;
     }
 
-    cloudsLayerValidateDefinition(definition);
+    texturesGetLayerType().callback_validate(definition);
 }
 
 #if 0

lib_paysages/textures/private.h

@@ -6,7 +6,7 @@
 /*
  * Get the base presence factor of a layer, not accounting for other layers.
  */
-double texturesGetLayerBasePresence(Renderer* renderer, TexturesLayerDefinition* layer, TerrainResult result);
+double texturesGetLayerBasePresence(TexturesLayerDefinition* layer, TerrainResult terrain);
 
 /*
  * Get triplanar noise value, depending on the normal direction.
@@ -16,6 +16,6 @@ double texturesGetTriplanarNoise(NoiseGenerator* noise, Vector3 location, Vector
 /*
  * Apply texture displacement on a terrain result.
  */
-TerrainResult texturesApplyLayerDisplacement(Renderer* renderer, TexturesLayerDefinition* layer, TerrainResult initial, TerrainResult support, double presence, double cancel_factor);
+/*TerrainResult texturesApplyLayerDisplacement(Renderer* renderer, TexturesLayerDefinition* layer, TerrainResult initial, TerrainResult support, double presence, double cancel_factor);*/
 
 #endif

lib_paysages/textures/public.h

@@ -76,8 +76,8 @@ typedef struct
     Color final_color;
 } TexturesResult;
 
-typedef TerrainResult (*FuncTexturesDisplaceTerrain)(Renderer* renderer, TerrainResult terrain);
-typedef TexturesResult (*FuncTexturesApplyToTerrain)(Renderer* renderer, TerrainResult terrain);
+typedef Vector3 (*FuncTexturesDisplaceTerrain)(Renderer* renderer, TerrainResult terrain);
+typedef TexturesResult (*FuncTexturesApplyToTerrain)(Renderer* renderer, double x, double z);
 
 typedef struct
 {

lib_paysages/textures/rendering.c

@@ -5,37 +5,72 @@
 #include "../renderer.h"
 
 /******************** Fake ********************/
-static TerrainResult _fakeDisplaceTerrain(Renderer* renderer, TerrainResult terrain)
+static Vector3 _fakeDisplaceTerrain(Renderer* renderer, TerrainResult terrain)
 {
     UNUSED(renderer);
 
-    return terrain;
+    return terrain.location;
 }
 
-static TexturesResult _fakeApplyToTerrain(Renderer* renderer, TerrainResult terrain)
+static TexturesResult _fakeApplyToTerrain(Renderer* renderer, double x, double z)
 {
     TexturesResult result;
 
-    result.base_location = terrain.location;
-    result.base_normal = terrain.normal;
+    result.base_location.x = x;
+    result.base_location.y = 0.0;
+    result.base_location.z = z;
+    result.base_normal = VECTOR_UP;
     result.layer_count = 0;
-    result.final_location = terrain.location;
+    result.final_location = result.base_location;
     result.final_color = COLOR_WHITE;
 
     return result;
 }
 
 /******************** Real ********************/
-static TerrainResult _realDisplaceTerrain(Renderer* renderer, TerrainResult terrain)
+static Vector3 _realDisplaceTerrain(Renderer* renderer, TerrainResult terrain)
 {
-    /* TODO */
-    return _fakeDisplaceTerrain(renderer, terrain);
+    TexturesDefinition* textures = renderer->textures->definition;
+    double offset = 0.0;
+    int i, n;
+
+    n = layersCount(textures->layers);
+    for (i = 0; i < n; i++)
+    {
+        TexturesLayerDefinition* layer = layersGetLayer(textures->layers, i);
+
+        if (layer->displacement_height > 0.0)
+        {
+            double presence = texturesGetLayerBasePresence(layer, terrain);
+            offset += texturesGetTriplanarNoise(layer->_displacement_noise, terrain.location, terrain.normal) * presence * layer->displacement_height;
+        }
+    }
+
+    return v3Add(terrain.location, v3Scale(v3Normalize(terrain.normal), offset));
 }
 
-static TexturesResult _realApplyToTerrain(Renderer* renderer, TerrainResult terrain)
+static TexturesResult _realApplyToTerrain(Renderer* renderer, double x, double z)
 {
-    /* TODO */
-    return _fakeApplyToTerrain(renderer, terrain);
+    TexturesResult result;
+
+    /* Displacement */
+    TerrainResult terrain = renderer->terrain->getResult(renderer, x, z, 1, 1);
+
+    /* TODO Detail */
+
+    /* TEMP */
+    SurfaceMaterial temp;
+    temp.base.r = 0.6;
+    temp.base.g = 0.55;
+    temp.base.b = 0.57;
+    temp.reflection = 0.02;
+    temp.shininess = 3.0;
+
+    result.base_location = terrain.location;
+    result.base_normal = terrain.normal;
+    result.final_location = terrain.location;
+    result.final_color = renderer->applyLightingToSurface(renderer, terrain.location, terrain.normal, &temp);
+    return result;
 }
 
 /******************** Renderer ********************/

lib_paysages/textures/tools.c

@@ -0,0 +1,33 @@
+#include "private.h"
+
+#include <assert.h>
+
+/*
+ * Get the base presence factor of a layer, not accounting for other layers.
+ */
+double texturesGetLayerBasePresence(TexturesLayerDefinition* layer, TerrainResult terrain)
+{
+    return zoneGetValue(layer->terrain_zone, terrain.location, terrain.normal);
+}
+
+/*
+ * Get triplanar noise value, depending on the normal direction.
+ */
+double texturesGetTriplanarNoise(NoiseGenerator* noise, Vector3 location, Vector3 normal)
+{
+    /*assert(v3Norm(normal) == 1.0);*/
+
+    double noiseXY = noiseGet2DTotal(noise, location.x, location.y);
+    double noiseXZ = noiseGet2DTotal(noise, location.x, location.z);
+    double noiseYZ = noiseGet2DTotal(noise, location.y, location.z);
+
+    double mXY = fabs(normal.z);
+    double mXZ = fabs(normal.y);
+    double mYZ = fabs(normal.x);
+    double total = mXY + mXZ + mYZ;
+    mXY /= total;
+    mXZ /= total;
+    mYZ /= total;
+
+    return noiseXY * mXY + noiseXZ * mXZ + noiseYZ * mYZ;
+}