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paysages3d/lib_paysages/terrain.c

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#include "terrain.h"
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <assert.h>
#include "shared/types.h"
#include "euclid.h"
#include "render.h"
#include "textures.h"
#include "water.h"
#include "tools.h"
#include "layers.h"
#include "terraincanvas.h"
void terrainSave(PackStream* stream, TerrainDefinition* definition)
{
noiseSaveGenerator(stream, definition->height_noise);
packWriteDouble(stream, &definition->height_factor);
packWriteDouble(stream, &definition->scaling);
layersSave(stream, definition->canvases);
packWriteDouble(stream, &definition->shadow_smoothing);
}
void terrainLoad(PackStream* stream, TerrainDefinition* definition)
{
noiseLoadGenerator(stream, definition->height_noise);
packReadDouble(stream, &definition->height_factor);
packReadDouble(stream, &definition->scaling);
layersLoad(stream, definition->canvases);
packReadDouble(stream, &definition->shadow_smoothing);
terrainValidateDefinition(definition);
}
TerrainDefinition terrainCreateDefinition()
{
TerrainDefinition definition;
definition.height_noise = noiseCreateGenerator();
definition.height_factor = 0.0;
definition.scaling = 1.0;
definition.canvases = layersCreate(terrainCanvasGetLayerType(), 50);
definition.shadow_smoothing = 0.0;
terrainValidateDefinition(&definition);
return definition;
}
void terrainDeleteDefinition(TerrainDefinition* definition)
{
noiseDeleteGenerator(definition->height_noise);
layersDelete(definition->canvases);
}
void terrainCopyDefinition(TerrainDefinition* source, TerrainDefinition* destination)
{
noiseCopy(source->height_noise, destination->height_noise);
destination->height_factor = source->height_factor;
destination->scaling = source->scaling;
layersCopy(source->canvases, destination->canvases);
destination->shadow_smoothing = source->shadow_smoothing;
terrainValidateDefinition(destination);
}
void terrainValidateDefinition(TerrainDefinition* definition)
{
int i, n;
TerrainCanvas* canvas;
double min, max;
noiseValidate(definition->height_noise);
layersValidate(definition->canvases);
/* Get minimal and maximal height */
definition->_min_height = -noiseGetMaxValue(definition->height_noise) * definition->height_factor;
definition->_max_height = noiseGetMaxValue(definition->height_noise) * definition->height_factor;
n = layersCount(definition->canvases);
for (i = 0; i < n; i++)
{
canvas = layersGetLayer(definition->canvases, i);
terrainCanvasGetLimits(canvas, &min, &max);
if (min < definition->_min_height)
{
definition->_min_height = min;
}
if (max > definition->_max_height)
{
definition->_max_height = max;
}
}
}
static inline double _getHeight(TerrainDefinition* definition, double x, double z)
{
TerrainCanvas* canvas;
Vector3 location;
int i, n;
location.x = x;
location.y = noiseGet2DTotal(definition->height_noise, x / definition->scaling, z / definition->scaling) * definition->height_factor;
location.z = z;
n = layersCount(definition->canvases);
for (i = 0; i < n; i++)
{
canvas = layersGetLayer(definition->canvases, i);
location = terrainCanvasApply(canvas, location);
}
/* TODO Apply modifiers */
return location.y;
}
static inline double _getHeightDetail(TerrainDefinition* definition, double x, double z, double detail)
{
TerrainCanvas* canvas;
Vector3 location;
int i, n;
location.x = x;
location.y = noiseGet2DDetail(definition->height_noise, x / definition->scaling, z / definition->scaling, detail / definition->height_factor) * definition->height_factor;
location.z = z;
n = layersCount(definition->canvases);
for (i = 0; i < n; i++)
{
canvas = layersGetLayer(definition->canvases, i);
location = terrainCanvasApply(canvas, location);
}
/* TODO Apply modifiers */
return location.y;
}
static inline Vector3 _getPoint(TerrainDefinition* definition, double x, double z)
{
Vector3 result;
result.x = x;
result.y = _getHeight(definition, x, z);
result.z = z;
return result;
}
Color terrainLightFilter(TerrainDefinition* definition, Renderer* renderer, Color light, Vector3 location, Vector3 light_location, Vector3 direction_to_light)
{
Vector3 inc_vector;
double inc_value, inc_base, inc_factor, height, diff, light_factor, smoothing, length;
direction_to_light = v3Normalize(direction_to_light);
if ((fabs(direction_to_light.x) < 0.0001 && fabs(direction_to_light.z) < 0.0001) || definition->height_factor < 0.001)
{
return light;
}
else if (direction_to_light.y < 0.05)
{
return COLOR_BLACK;
}
else if (direction_to_light.y < 0.0000)
{
light.r *= (0.05 + direction_to_light.y) / 0.05;
light.g *= (0.05 + direction_to_light.y) / 0.05;
light.b *= (0.05 + direction_to_light.y) / 0.05;
}
inc_factor = (double)renderer->render_quality;
inc_base = definition->height_factor / definition->scaling;
inc_value = inc_base / inc_factor;
smoothing = definition->shadow_smoothing;
light_factor = 1.0;
length = 0.0;
diff = 0.0;
do
{
inc_vector = v3Scale(direction_to_light, inc_value);
length += v3Norm(inc_vector);
location = v3Add(location, inc_vector);
height = _getHeightDetail(definition, location.x, location.z, diff / inc_factor);
diff = location.y - height;
if (diff < 0.0)
{
if (length * smoothing > 0.000001)
{
light_factor += diff * v3Norm(inc_vector) / (length * smoothing);
}
else
{
light_factor = 0.0;
}
}
if (diff < inc_base / inc_factor)
{
inc_value = inc_base / inc_factor;
}
else if (diff > inc_base)
{
inc_value = inc_base;
}
else
{
inc_value = diff;
}
} while (light_factor > 0.0 && length < (10.0 * inc_factor) && location.y <= definition->_max_height);
if (light_factor <= 0.0)
{
return COLOR_BLACK;
}
else
{
light.r *= light_factor;
light.g *= light_factor;
light.b *= light_factor;
return light;
}
}
static Color _getColor(TerrainDefinition* definition, Renderer* renderer, Vector3 point, double precision)
{
Color color;
color = renderer->applyTextures(renderer, point, precision);
color = renderer->atmosphere->applyAerialPerspective(renderer, point, color);
color = renderer->applyClouds(renderer, color, renderer->camera_location, point);
return color;
}
int terrainProjectRay(TerrainDefinition* definition, Renderer* renderer, Vector3 start, Vector3 direction, Vector3* hit_point, Color* hit_color)
{
Vector3 inc_vector;
double inc_value, inc_base, inc_factor, height, diff, lastdiff, length;
direction = v3Normalize(direction);
inc_factor = (double)renderer->render_quality;
inc_base = 1.0;
inc_value = inc_base / inc_factor;
lastdiff = start.y - _getHeight(definition, start.x, start.z);
length = 0.0;
do
{
inc_vector = v3Scale(direction, inc_value);
length += v3Norm(inc_vector);
start = v3Add(start, inc_vector);
height = _getHeight(definition, start.x, start.z);
diff = start.y - height;
if (diff < 0.0)
{
if (fabs(diff - lastdiff) > 0.00001)
{
start = v3Add(start, v3Scale(inc_vector, -diff / (diff - lastdiff)));
start.y = _getHeight(definition, start.x, start.z);
}
else
{
start.y = height;
}
*hit_point = start;
*hit_color = _getColor(definition, renderer, start, renderer->getPrecision(renderer, start));
return 1;
}
if (diff < inc_base / inc_factor)
{
inc_value = inc_base / inc_factor;
}
else if (diff > inc_base)
{
inc_value = inc_base;
}
else
{
inc_value = diff;
}
lastdiff = diff;
} while (length < 50.0 && start.y <= definition->_max_height);
return 0;
}
static Color _postProcessFragment(Renderer* renderer, Vector3 point, void* data)
{
double precision;
TerrainDefinition* definition;
definition = (TerrainDefinition*)data;
point = _getPoint(definition, point.x, point.z);
precision = renderer->getPrecision(renderer, point);
return _getColor(definition, renderer, point, precision);
}
static void _renderQuad(TerrainDefinition* definition, Renderer* renderer, double x, double z, double size, double water_height)
{
Vector3 v1, v2, v3, v4;
v1 = _getPoint(definition, x, z);
v2 = _getPoint(definition, x, z + size);
v3 = _getPoint(definition, x + size, z + size);
v4 = _getPoint(definition, x + size, z);
if (v1.y > water_height || v2.y > water_height || v3.y > water_height || v4.y > water_height)
{
renderer->pushQuad(renderer, v1, v2, v3, v4, _postProcessFragment, definition);
}
}
double terrainGetHeight(TerrainDefinition* definition, double x, double z)
{
return _getHeight(definition, x, z);
}
double terrainGetHeightNormalized(TerrainDefinition* definition, double x, double z)
{
if (definition->_max_height - definition->_min_height <= 0.0000001)
{
return 0.5;
}
else
{
return (_getHeight(definition, x, z) - definition->_min_height) / (definition->_max_height - definition->_min_height);
}
}
Color terrainGetColor(TerrainDefinition* definition, Renderer* renderer, double x, double z, double detail)
{
Vector3 point = _getPoint(definition, x, z);
return _getColor(definition, renderer, point, detail);
}
void terrainRender(TerrainDefinition* definition, Renderer* renderer)
{
int chunk_factor, chunk_count, i;
double cx = renderer->camera_location.x;
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;
chunk_factor = 1;
chunk_count = 2;
radius_int = 0.0;
radius_ext = min_chunk_size;
chunk_size = min_chunk_size;
water_height = renderer->getWaterHeightInfo(renderer).max_height;
while (radius_ext < 1000.0)
{
if (!renderer->addRenderProgress(renderer, 0.0))
{
return;
}
for (i = 0; i < chunk_count - 1; i++)
{
_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)
{
chunk_count /= 2;
chunk_factor *= 2;
/* TODO Fill in gaps with triangles */
}
chunk_count += 2;
chunk_size = min_chunk_size * chunk_factor;
radius_int = radius_ext;
radius_ext += chunk_size;
}
}
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