paysages: Don't render underwater terrain quads.

git-svn-id: https://subversion.assembla.com/svn/thunderk/paysages@251 b1fd45b6-86a6-48da-8261-f70d1f35bdcc

lib_paysages/renderer.c

@@ -3,6 +3,7 @@
 #include "lighting.h"
 
 RayCastingResult _RAYCASTING_NULL = {0};
+HeightInfo _WATER_HEIGHT_INFO = {-1000000.0, -1000000.0, -1000000.0};
 
 static Color _filterLight(Renderer* renderer, Color light_color, Vector3 at_location, Vector3 light_location, Vector3 direction_to_light)
 {
@@ -29,6 +30,11 @@ static double _getTerrainHeight(Renderer* renderer, double x, double z)
     return 0.0;
 }
 
+static HeightInfo _getWaterHeightInfo(Renderer* renderer)
+{
+    return _WATER_HEIGHT_INFO;
+}
+
 static Color _applyTextures(Renderer* renderer, Vector3 location, double precision)
 {
     return COLOR_TRANSPARENT;
@@ -71,6 +77,7 @@ Renderer rendererGetFake()
     result.applyLightingToSurface = _applyLightingToSurface;
     result.rayWalking = _rayWalking;
     result.getTerrainHeight = _getTerrainHeight;
+    result.getWaterHeightInfo = _getWaterHeightInfo;
     result.applyTextures = _applyTextures;
     result.applyAtmosphere = _applyAtmosphere;
     result.applyClouds = _applyClouds;

lib_paysages/renderer.h

@@ -23,6 +23,7 @@ struct Renderer
     /* Scenery related */
     RayCastingResult (*rayWalking)(Renderer* renderer, Vector3 location, Vector3 direction, int terrain, int water, int sky, int clouds);
     double (*getTerrainHeight)(Renderer* renderer, double x, double z);
+    HeightInfo (*getWaterHeightInfo)(Renderer* renderer);
     Color (*applyTextures)(Renderer* renderer, Vector3 location, double precision);
     Color (*applyAtmosphere)(Renderer* renderer, Vector3 location, Color base);
     Color (*applyClouds)(Renderer* renderer, Color base, Vector3 start, Vector3 end);

lib_paysages/scenery.c

@@ -250,6 +250,11 @@ static double _getTerrainHeight(Renderer* renderer, double x, double z)
     return terrainGetHeight(&_terrain, x, z);
 }
 
+static HeightInfo _getWaterHeightInfo(Renderer* renderer)
+{
+    return waterGetHeightInfo(&_water);
+}
+
 static Color _applyTextures(Renderer* renderer, Vector3 location, double precision)
 {
     return texturesGetColor(&_textures, renderer, location, precision);
@@ -306,6 +311,7 @@ Renderer sceneryGetStandardRenderer(int quality)
     result.applyLightingToSurface = _applyLightingToSurface;
     result.rayWalking = _rayWalking;
     result.getTerrainHeight = _getTerrainHeight;
+    result.getWaterHeightInfo = _getWaterHeightInfo;
     result.applyTextures = _applyTextures;
     result.applyAtmosphere = _applyAtmosphere;
     result.applyClouds = _applyClouds;

lib_paysages/shared/types.h

@@ -114,6 +114,13 @@ typedef struct
 } RayCastingResult;
 typedef RayCastingResult (*RayCastingFunction)(Vector3 start, Vector3 direction);
 
+typedef struct
+{
+    double min_height;
+    double max_height;
+    double base_height;
+} HeightInfo;
+
 #ifdef __cplusplus
 }
 #endif

lib_paysages/terrain.c

@@ -311,7 +311,7 @@ static Vertex _getFirstPassVertex(TerrainDefinition* definition, double x, doubl
     return result;
 }
 
-static void _renderQuad(TerrainDefinition* definition, Renderer* renderer, double x, double z, double size)
+static void _renderQuad(TerrainDefinition* definition, Renderer* renderer, double x, double z, double size, double water_height)
 {
     Vertex v1, v2, v3, v4;
 
@@ -319,7 +319,11 @@ static void _renderQuad(TerrainDefinition* definition, Renderer* renderer, doubl
     v2 = _getFirstPassVertex(definition, x, z + size, size);
     v3 = _getFirstPassVertex(definition, x + size, z + size, size);
     v4 = _getFirstPassVertex(definition, x + size, z, size);
-    renderPushQuad(renderer, &v1, &v2, &v3, &v4);
+    
+    if (v1.location.y > water_height || v2.location.y > water_height || v3.location.y > water_height || v4.location.y > water_height)
+    {
+        renderPushQuad(renderer, &v1, &v2, &v3, &v4);
+    }
 }
 
 double terrainGetHeight(TerrainDefinition* definition, double x, double z)
@@ -352,6 +356,7 @@ void terrainRender(TerrainDefinition* definition, Renderer* renderer, RenderProg
     double cz = renderer->camera_location.z;
     double min_chunk_size, visible_chunk_size;
     double radius_int, radius_ext, chunk_size;
+    double water_height;
 
     min_chunk_size = 0.1 / (double)renderer->render_quality;
     visible_chunk_size = 0.05 / (double)renderer->render_quality;
@@ -362,6 +367,7 @@ void terrainRender(TerrainDefinition* definition, Renderer* renderer, RenderProg
     radius_ext = min_chunk_size;
     chunk_size = min_chunk_size;
     
+    water_height = renderer->getWaterHeightInfo(renderer).max_height;
 
     while (radius_ext < 1000.0)
     {
@@ -372,10 +378,10 @@ void terrainRender(TerrainDefinition* definition, Renderer* renderer, RenderProg
 
         for (i = 0; i < chunk_count - 1; i++)
         {
-            _renderQuad(definition, renderer, cx - radius_ext + chunk_size * i, cz - radius_ext, chunk_size);
-            _renderQuad(definition, renderer, cx + radius_int, cz - radius_ext + chunk_size * i, chunk_size);
-            _renderQuad(definition, renderer, cx + radius_int - chunk_size * i, cz + radius_int, chunk_size);
-            _renderQuad(definition, renderer, cx - radius_ext, cz + radius_int - chunk_size * i, chunk_size);
+            _renderQuad(definition, renderer, cx - radius_ext + chunk_size * i, cz - radius_ext, chunk_size, water_height);
+            _renderQuad(definition, renderer, cx + radius_int, cz - radius_ext + chunk_size * i, chunk_size, water_height);
+            _renderQuad(definition, renderer, cx + radius_int - chunk_size * i, cz + radius_int, chunk_size, water_height);
+            _renderQuad(definition, renderer, cx - radius_ext, cz + radius_int - chunk_size * i, chunk_size, water_height);
         }
 
         if (chunk_count % 64 == 0 && chunk_size / radius_int < visible_chunk_size)

lib_paysages/water.c

@@ -136,6 +136,17 @@ static inline Vector3 _refractRay(Vector3 incoming, Vector3 normal)
     }
 }
 
+HeightInfo waterGetHeightInfo(WaterDefinition* definition)
+{
+    HeightInfo info;
+    
+    info.base_height = definition->height;
+    info.min_height = definition->height - noiseGetMaxValue(definition->waves_noise) * definition->waves_noise_height;
+    info.max_height = definition->height + noiseGetMaxValue(definition->waves_noise) * definition->waves_noise_height;
+    
+    return info;
+}
+
 Color waterLightFilter(WaterDefinition* definition, Renderer* renderer, Color light, Vector3 location, Vector3 light_location, Vector3 direction_to_light)
 {
     double factor;

lib_paysages/water.h

@@ -43,6 +43,7 @@ void waterDeleteDefinition(WaterDefinition* definition);
 void waterCopyDefinition(WaterDefinition* source, WaterDefinition* destination);
 void waterValidateDefinition(WaterDefinition* definition);
 
+HeightInfo waterGetHeightInfo(WaterDefinition* definition);
 Color waterLightFilter(WaterDefinition* definition, Renderer* renderer, Color light, Vector3 location, Vector3 light_location, Vector3 direction_to_light);
 WaterResult waterGetColorDetail(WaterDefinition* definition, Renderer* renderer, Vector3 location, Vector3 look);
 Color waterGetColor(WaterDefinition* definition, Renderer* renderer, Vector3 location, Vector3 look);