paysages : Small optimization.

git-svn-id: https://subversion.assembla.com/svn/thunderk/paysages@353 b1fd45b6-86a6-48da-8261-f70d1f35bdcc

TODO

@@ -6,7 +6,6 @@ Technology Preview 2 :
 - Add "hardness to light" and shadow control ("minimum lighting") to material.
 - Render tab previews should not rerender when changing render options.
 - Add layer sorting/naming.
-- Disable specular lighting in explorer (and everything camera dependent).
 - Add logarithmic sliders for some float values.
 - Save GUI config (views, render params).
 - Add an OSD ability on previews and use it for camera location and user landmarks.
@@ -14,22 +13,11 @@ Technology Preview 2 :
 - Add a terrain modifier dialog with zones.
 - Use the curve editor in noise editor
 - Add a noise filler (and maybe noise intervals ?).
-- Optimize the use of noiseGetMaxValue (limit its use or cache it).
 - Fix the distorted sun appearance.
 - Improve curve editor.
    => Add curve modes
    => Add axis labels and grid
    => Add logarithmic mode
-- Improve 3d explorer
-   => Restore LOD and intelligent poly count (and raise max tessellation)
-   => Interrupt chunk rendering when quitting dialog
-   => Don't display the water if it's below all ground
-   => Try to overcome the near frustum cutting
-   => Disable texture reflection of light (dependant on camera location)
-   => Add toggles (for water...)
-   => Max texture size should depend on GPU memory available
-- Water and terrain LOD moves with the camera, fix it like in the wanderer.
-- Interrupt preview chunk renderings that will be discarded at commit, or that are no more visible.
 - Fix "RGB parameters out of range" (and segfault) on preview while moving render params fast in render tab.
    => May need to change the updateData system.
    => Previews need to be paused while updating data.
@@ -49,8 +37,17 @@ Technology Preview 3 :
 - Mark modified tabs and ask for losing modifications (idem for layers).
 - Fix potential holes in land rendering.
 - Progressive final render.
-- Propose several backgrounds for water rendering (grid, sinus...).
-- If we can't remove clouds artifacts, blur them.
+- Propose several backgrounds for water preview (grid, sinus...).
+- Water and terrain LOD moves with the camera, fix it like in the wanderer.
+- Improve 3d explorer
+   => Restore LOD and intelligent poly count (and raise max tessellation)
+   => Interrupt chunk rendering when quitting dialog
+   => Don't display the water if it's below all ground
+   => Try to overcome the near frustum cutting
+   => Disable specular lighting (dependant on camera location)
+   => Add toggles (for water...)
+   => Max texture size should depend on GPU memory available
+- Interrupt preview chunk renderings that will be discarded at commit, or that are no more visible.
 
 Release Candidate :
 - Polish all features and UI.

lib_paysages/noise.c

@@ -18,6 +18,8 @@ struct NoiseGenerator
     double height_offset;
     int level_count;
     struct NoiseLevel levels[MAX_LEVEL_COUNT];
+    
+    double _max_height;
 };
 
 static int _noise_pool_size;
@@ -81,6 +83,8 @@ NoiseGenerator* noiseCreateGenerator()
     result->level_count = 0;
     result->height_offset = 0.0;
     
+    noiseValidate(result);
+
     return result;
 }
 
@@ -131,6 +135,8 @@ void noiseLoadGenerator(PackStream* stream, NoiseGenerator* perlin)
         packReadDouble(stream, &level->yoffset);
         packReadDouble(stream, &level->zoffset);
     }
+    
+    noiseValidate(perlin);
 }
 
 void noiseCopy(NoiseGenerator* source, NoiseGenerator* destination)
@@ -142,6 +148,21 @@ void noiseCopy(NoiseGenerator* source, NoiseGenerator* destination)
     destination->level_count = source->level_count;
 
     memcpy(destination->levels, source->levels, sizeof(NoiseLevel) * destination->level_count);
+    
+    noiseValidate(destination);
+}
+
+void noiseValidate(NoiseGenerator* generator)
+{
+    int x;
+    double max_height = generator->height_offset;
+
+    for (x = 0; x < generator->level_count; x++)
+    {
+        max_height += generator->levels[x].height / 2.0;
+    }
+
+    generator->_max_height = max_height;
 }
 
 void noiseGenerateBaseNoise(NoiseGenerator* generator, int size)
@@ -161,15 +182,7 @@ int noiseGetBaseSize(NoiseGenerator* generator)
 
 double noiseGetMaxValue(NoiseGenerator* generator)
 {
-    int x;
-    double result = generator->height_offset;
-
-    for (x = 0; x < generator->level_count; x++)
-    {
-        result += generator->levels[x].height / 2.0;
-    }
-
-    return result;
+    return generator->_max_height;
 }
 
 int noiseGetLevelCount(NoiseGenerator* generator)
@@ -180,6 +193,7 @@ int noiseGetLevelCount(NoiseGenerator* generator)
 void noiseClearLevels(NoiseGenerator* generator)
 {
     generator->level_count = 0;
+    noiseValidate(generator);
 }
 
 void noiseAddLevel(NoiseGenerator* generator, NoiseLevel level)
@@ -188,6 +202,7 @@ void noiseAddLevel(NoiseGenerator* generator, NoiseLevel level)
     {
         generator->levels[generator->level_count] = level;
         generator->level_count++;
+        noiseValidate(generator);
     }
 }
 
@@ -240,6 +255,7 @@ void noiseRemoveLevel(NoiseGenerator* generator, int level)
             memmove(generator->levels + level, generator->levels + level + 1, sizeof(NoiseLevel) * (generator->level_count - level - 1));
         }
         generator->level_count--;
+        noiseValidate(generator);
     }
 }
 
@@ -261,6 +277,7 @@ void noiseSetLevel(NoiseGenerator* generator, int level, NoiseLevel params)
     if (level >= 0 && level < generator->level_count)
     {
         generator->levels[level] = params;
+        noiseValidate(generator);
     }
 }
 
@@ -301,6 +318,7 @@ void noiseNormalizeHeight(NoiseGenerator* generator, double min_height, double m
         }
     }
     generator->height_offset = min_height + target_height / 2.0;
+    noiseValidate(generator);
 }
 
 

lib_paysages/noise.h

@@ -28,6 +28,7 @@ void noiseDeleteGenerator(NoiseGenerator* generator);
 void noiseSaveGenerator(PackStream* stream, NoiseGenerator* perlin);
 void noiseLoadGenerator(PackStream* stream, NoiseGenerator* perlin);
 void noiseCopy(NoiseGenerator* source, NoiseGenerator* destination);
+void noiseValidate(NoiseGenerator* generator);
 void noiseGenerateBaseNoise(NoiseGenerator* generator, int size);
 int noiseGetBaseSize(NoiseGenerator* generator);
 double noiseGetMaxValue(NoiseGenerator* generator);