Michaël Lemaire
e3f692800b
git-svn-id: https://subversion.assembla.com/svn/thunderk/paysages@212 b1fd45b6-86a6-48da-8261-f70d1f35bdcc
375 lines
9.5 KiB
C
375 lines
9.5 KiB
C
#include <stdlib.h>
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#include <math.h>
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#include <string.h>
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#include "shared/types.h"
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#include "shared/functions.h"
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#include "shared/globals.h"
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#include "shared/constants.h"
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#include "textures.h"
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#include "water.h"
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#include "terrain.h"
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static TerrainDefinition _definition;
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static TerrainQuality _quality;
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static TerrainEnvironment _environment;
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static double _max_height = 1.0;
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void terrainInit()
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{
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_definition = terrainCreateDefinition();
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_max_height = noiseGetMaxValue(_definition.height_noise);
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}
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void terrainSave(FILE* f)
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{
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int i;
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noiseSave(_definition.height_noise, f);
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toolsSaveInt(f, _definition.height_modifiers_count);
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for (i = 0; i < _definition.height_modifiers_count; i++)
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{
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modifierSave(_definition.height_modifiers[i], f);
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}
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}
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void terrainLoad(FILE* f)
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{
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int i;
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noiseLoad(_definition.height_noise, f);
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_max_height = noiseGetMaxValue(_definition.height_noise);
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for (i = 0; i < _definition.height_modifiers_count; i++)
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{
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modifierDelete(_definition.height_modifiers[i]);
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}
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_definition.height_modifiers_count = toolsLoadInt(f);
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for (i = 0; i < _definition.height_modifiers_count; i++)
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{
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_definition.height_modifiers[i] = modifierCreate();
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modifierLoad(_definition.height_modifiers[i], f);
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}
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}
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TerrainDefinition terrainCreateDefinition()
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{
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TerrainDefinition definition;
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definition.height_noise = noiseCreateGenerator();
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definition.height_modifiers_count = 0;
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return definition;
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}
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void terrainDeleteDefinition(TerrainDefinition definition)
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{
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int i;
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noiseDeleteGenerator(definition.height_noise);
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for (i = 0; i < definition.height_modifiers_count; i++)
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{
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modifierDelete(definition.height_modifiers[i]);
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}
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}
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void terrainCopyDefinition(TerrainDefinition source, TerrainDefinition* destination)
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{
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int i;
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noiseCopy(source.height_noise, destination->height_noise);
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for (i = 0; i < destination->height_modifiers_count; i++)
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{
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modifierDelete(destination->height_modifiers[i]);
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}
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destination->height_modifiers_count = source.height_modifiers_count;
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for (i = 0; i < destination->height_modifiers_count; i++)
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{
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destination->height_modifiers[i] = modifierCreateCopy(source.height_modifiers[i]);
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}
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}
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void terrainSetDefinition(TerrainDefinition definition)
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{
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terrainCopyDefinition(definition, &_definition);
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_max_height = noiseGetMaxValue(_definition.height_noise);
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/* FIXME _max_height depends on modifiers */
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}
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TerrainDefinition terrainGetDefinition()
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{
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return _definition;
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}
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int terrainAddModifier(TerrainDefinition* definition, HeightModifier* modifier)
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{
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if (definition->height_modifiers_count < MAX_HEIGHT_MODIFIER_COUNT)
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{
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definition->height_modifiers[definition->height_modifiers_count] = modifierCreateCopy(modifier);
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return definition->height_modifiers_count++;
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}
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else
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{
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return -1;
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}
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}
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void terrainDelModifier(TerrainDefinition* definition, int modifier_position)
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{
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if (modifier_position >= 0 && modifier_position < definition->height_modifiers_count)
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{
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/* TODO */
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}
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}
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void terrainSetQuality(TerrainQuality quality)
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{
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_quality = quality;
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}
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TerrainQuality terrainGetQuality()
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{
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return _quality;
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}
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static inline double _getHeight(TerrainDefinition* definition, double x, double z, double detail)
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{
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Vector3 location;
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int i;
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location.x = x;
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location.y = noiseGet2DDetail(definition->height_noise, x, z, detail);
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location.z = z;
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for (i = 0; i < definition->height_modifiers_count; i++)
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{
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location = modifierApply(definition->height_modifiers[i], location);
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}
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return location.y;
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}
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static inline Vector3 _getPoint(TerrainDefinition* definition, double x, double z, double detail)
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{
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Vector3 result;
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result.x = x;
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result.y = _getHeight(definition, x, z, detail);
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result.z = z;
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return result;
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}
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double terrainGetShadow(Vector3 start, Vector3 direction)
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{
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Vector3 inc_vector;
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double inc_value, inc_base, inc_factor, height, diff, light, smoothing, length, water;
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direction = v3Normalize(direction);
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inc_factor = (double)render_quality;
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inc_base = 1.0;
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inc_value = inc_base / inc_factor;
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smoothing = 0.03 * inc_factor;;
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water = waterGetLightFactor(start);
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light = 1.0;
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length = 0.0;
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do
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{
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inc_vector = v3Scale(direction, inc_value);
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length += v3Norm(inc_vector);
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start = v3Add(start, inc_vector);
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height = _getHeight(&_definition, start.x, start.z, inc_value);
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diff = start.y - height;
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if (diff < 0.0)
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{
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light += diff / smoothing;
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}
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if (diff < inc_base / inc_factor)
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{
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inc_value = inc_base / inc_factor;
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}
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else if (diff > inc_base)
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{
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inc_value = inc_base;
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}
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else
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{
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inc_value = diff;
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}
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} while (light > 0.0 && length < 50.0 && start.y <= _max_height);
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light *= water;
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if (light < 0.0)
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{
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return 1.0;
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}
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else
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{
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return 1.0 - light;
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}
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}
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static Color _getColor(TerrainDefinition* definition, Vector3 point, double precision)
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{
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Color color;
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/* FIXME Environment for textures should be customized */
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color = texturesGetColor(point);
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color = fogApplyToLocation(point, color);
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//color = cloudsApplySegmentResult(color, camera_location, point);
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return color;
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}
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int terrainProjectRay(Vector3 start, Vector3 direction, Vector3* hit_point, Color* hit_color)
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{
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Vector3 inc_vector;
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double inc_value, inc_base, inc_factor, height, diff, length;
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direction = v3Normalize(direction);
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inc_factor = (double)render_quality;
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inc_base = 1.0;
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inc_value = inc_base / inc_factor;
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length = 0.0;
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do
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{
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inc_vector = v3Scale(direction, inc_value);
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length += v3Norm(inc_vector);
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start = v3Add(start, inc_vector);
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height = _getHeight(&_definition, start.x, start.z, inc_value);
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diff = start.y - height;
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if (diff < 0.0)
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{
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start.y = height;
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*hit_point = start;
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*hit_color = _getColor(&_definition, start, inc_value);
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return 1;
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}
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if (diff < inc_base / inc_factor)
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{
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inc_value = inc_base / inc_factor;
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}
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else if (diff > inc_base)
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{
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inc_value = inc_base;
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}
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else
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{
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inc_value = diff;
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}
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} while (length < 50.0 && start.y <= _max_height);
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return 0;
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}
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static int _postProcessFragment(RenderFragment* fragment)
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{
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Vector3 point;
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double precision;
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point = fragment->vertex.location;
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precision = renderGetPrecision(point);
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point = _getPoint(&_definition, point.x, point.z, precision);
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fragment->vertex.color = _getColor(&_definition, point, precision);
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return 1;
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}
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static Vertex _getFirstPassVertex(double x, double z, double detail)
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{
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Vertex result;
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double value;
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result.location = _getPoint(&_definition, x, z, 0.0);
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value = sin(x) * sin(x) * cos(z) * cos(z);
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result.color.r = value;
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result.color.g = value;
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result.color.b = value;
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result.color.a = 1.0;
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result.normal.x = result.normal.y = result.normal.z = 0.0;
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result.callback = _postProcessFragment;
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return result;
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}
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static void _renderQuad(double x, double z, double size)
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{
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Vertex v1, v2, v3, v4;
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v1 = _getFirstPassVertex(x, z, size);
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v2 = _getFirstPassVertex(x, z + size, size);
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v3 = _getFirstPassVertex(x + size, z + size, size);
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v4 = _getFirstPassVertex(x + size, z, size);
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renderPushQuad(&v1, &v2, &v3, &v4);
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}
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double terrainGetHeight(double x, double z)
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{
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return _getHeight(&_definition, x, z, 0.0);
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}
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double terrainGetHeightNormalized(double x, double z)
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{
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return 0.5 + _getHeight(&_definition, x, z, 0.0) / (_max_height * 2.0);
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}
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Color terrainGetColorCustom(double x, double z, double detail, TerrainDefinition* definition, TerrainQuality* quality, TerrainEnvironment* environment)
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{
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return _getColor(definition, _getPoint(definition, x, z, detail), detail);
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}
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Color terrainGetColor(double x, double z, double detail)
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{
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return terrainGetColorCustom(x, z, detail, &_definition, &_quality, &_environment);
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}
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void terrainRender(RenderProgressCallback callback)
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{
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int chunk_factor, chunk_count, i;
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double cx = camera_location.x;
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double cz = camera_location.z;
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double radius_int, radius_ext, chunk_size;
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chunk_factor = 1;
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chunk_count = 2;
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radius_int = 0.0;
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radius_ext = _quality.min_chunk_size;
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chunk_size = _quality.min_chunk_size;
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while (radius_ext < 1000.0)
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{
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if (!callback(radius_ext / 1000.0))
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{
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return;
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}
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for (i = 0; i < chunk_count - 1; i++)
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{
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_renderQuad(cx - radius_ext + chunk_size * i, cz - radius_ext, chunk_size);
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_renderQuad(cx + radius_int, cz - radius_ext + chunk_size * i, chunk_size);
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_renderQuad(cx + radius_int - chunk_size * i, cz + radius_int, chunk_size);
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_renderQuad(cx - radius_ext, cz + radius_int - chunk_size * i, chunk_size);
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}
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if (chunk_count % 64 == 0 && chunk_size / radius_int < _quality.visible_chunk_size)
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{
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chunk_count /= 2;
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chunk_factor *= 2;
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/* TODO Fill in gaps with triangles */
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}
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chunk_count += 2;
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chunk_size = _quality.min_chunk_size * chunk_factor;
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radius_int = radius_ext;
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radius_ext += chunk_size;
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}
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}
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