paysages : Added light multi sampling (for skydome only).

git-svn-id: https://subversion.assembla.com/svn/thunderk/paysages@267 b1fd45b6-86a6-48da-8261-f70d1f35bdcc

TODO

@@ -1,6 +1,5 @@
 - ColorGradation dialog.
 - All noises should use the same entropy pool (saved separately), and avoid reallocs.
-- Implement light multi-sampling (mainly for skydome).
 - Implement scaling and scrolling on previews.
 - Water and terrain LOD moves with the camera, fix it like in the wanderer.
 - Restore render progress.

lib_paysages/lighting.c

@@ -157,6 +157,44 @@ static Color _applyLightCustom(LightDefinition* definition, Renderer* renderer,
 
     light = definition->color;
 
+    if (definition->amplitude > 0.0)
+    {
+        // TODO Sampling around light direction
+        int xsamples, ysamples, samples, x, y;
+        double xstep, ystep, factor;
+        LightDefinition sublight;
+        
+        ysamples = renderer->render_quality / 4 + 1;
+        xsamples = renderer->render_quality / 2 + 1;
+        samples = xsamples * ysamples + 1;
+        factor = 1.0 / (double)samples;
+        
+        xstep = M_PI * 2.0 / (double)xsamples;
+        ystep = M_PI * 0.5 / (double)(ysamples - 1);
+        
+        sublight = *definition;
+        sublight.amplitude = 0.0;
+        sublight.color.r *= factor;
+        sublight.color.g *= factor;
+        sublight.color.b *= factor;
+
+        result = _applyLightCustom(&sublight, renderer, location, normal, material);
+        for (x = 0; x < xsamples; x++)
+        {
+            for (y = 0; y < ysamples; y++)
+            {
+                sublight.direction.x = cos(x * xstep) * cos(y * ystep);
+                sublight.direction.y = -sin(y * ystep);
+                sublight.direction.z = sin(x * xstep) * cos(y * ystep);
+                light = _applyLightCustom(&sublight, renderer, location, normal, material);
+                result.r += light.r;
+                result.g += light.g;
+                result.b += light.b;
+            }
+        }
+        return result;
+    }
+    
     direction_inv = v3Scale(definition->direction, -1.0);
     if (definition->masked)
     {

lib_paysages/sky.c

@@ -116,9 +116,9 @@ int skyGetLights(SkyDefinition* sky, LightDefinition* lights, int max_lights)
             lights[1].direction.y = -1.0;
             lights[1].direction.z = 0.0;
             lights[1].color = colorGradationGet(&sky->zenith_color, sky->daytime);
-            lights[1].color.r *= 0.4;
-            lights[1].color.g *= 0.4;
-            lights[1].color.b *= 0.4;
+            lights[1].color.r *= 0.6;
+            lights[1].color.g *= 0.6;
+            lights[1].color.b *= 0.6;
             lights[1].reflection = 0.0;
             lights[1].filtered = 1;
             lights[1].masked = 0;