paysages3d/src/rendering/water/wat_render.cpp

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#include "private.h"
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#include <cmath>
#include "../tools.h"
#include "../renderer.h"
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#include "NoiseGenerator.h"
static HeightInfo _FAKE_HEIGHT_INFO = {0.0, 0.0, 0.0};
/******************** Fake ********************/
static HeightInfo _fakeGetHeightInfo(Renderer* renderer)
{
UNUSED(renderer);
return _FAKE_HEIGHT_INFO;
}
static double _fakeGetHeight(Renderer* renderer, double x, double z)
{
UNUSED(renderer);
UNUSED(x);
UNUSED(z);
return 0.0;
}
static WaterResult _fakeGetResult(Renderer* renderer, double x, double z)
{
WaterResult result;
UNUSED(renderer);
result.location.x = x;
result.location.y = 0.0;
result.location.z = z;
result.base = COLOR_BLUE;
result.reflected = COLOR_BLACK;
result.refracted = COLOR_BLACK;
result.foam = COLOR_BLACK;
result.final = COLOR_BLUE;
return result;
}
/******************** Helpers ********************/
static inline double _getHeight(WaterDefinition* definition, double base_height, double x, double z)
{
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return base_height + definition->_waves_noise->get2DTotal(x, z);
}
static inline Vector3 _getNormal(WaterDefinition* definition, double base_height, Vector3 base, double detail)
{
Vector3 back, right;
double x, z;
x = base.x;
z = base.z;
back.x = x;
back.y = _getHeight(definition, base_height, x, z + detail);
back.z = z + detail;
back = v3Sub(back, base);
right.x = x + detail;
right.y = _getHeight(definition, base_height, x + detail, z);
right.z = z;
right = v3Sub(right, base);
return v3Normalize(v3Cross(back, right));
}
static inline Vector3 _reflectRay(Vector3 incoming, Vector3 normal)
{
double c;
c = v3Dot(normal, v3Scale(incoming, -1.0));
return v3Add(incoming, v3Scale(normal, 2.0 * c));
}
static inline Vector3 _refractRay(Vector3 incoming, Vector3 normal)
{
double c1, c2, f;
f = 1.0 / 1.33;
c1 = v3Dot(normal, v3Scale(incoming, -1.0));
c2 = sqrt(1.0 - pow(f, 2.0) * (1.0 - pow(c1, 2.0)));
if (c1 >= 0.0)
{
return v3Add(v3Scale(incoming, f), v3Scale(normal, f * c1 - c2));
}
else
{
return v3Add(v3Scale(incoming, f), v3Scale(normal, c2 - f * c1));
}
}
static inline Color _getFoamMask(Renderer* renderer, WaterDefinition* definition, Vector3 location, Vector3 normal, double detail)
{
Color result;
double foam_factor, normal_diff, location_offset;
double base_height;
base_height = renderer->terrain->getWaterHeight(renderer);
location_offset = 2.0 * detail;
foam_factor = 0.0;
location.x += location_offset;
normal_diff = 1.0 - v3Dot(normal, _getNormal(definition, base_height, location, detail));
if (normal_diff > foam_factor)
{
foam_factor = normal_diff;
}
location.x -= location_offset * 2.0;
normal_diff = 1.0 - v3Dot(normal, _getNormal(definition, base_height, location, detail));
if (normal_diff > foam_factor)
{
foam_factor = normal_diff;
}
location.x += location_offset;
location.z -= location_offset;
normal_diff = 1.0 - v3Dot(normal, _getNormal(definition, base_height, location, detail));
if (normal_diff > foam_factor)
{
foam_factor = normal_diff;
}
location.z += location_offset * 2.0;
normal_diff = 1.0 - v3Dot(normal, _getNormal(definition, base_height, location, detail));
if (normal_diff > foam_factor)
{
foam_factor = normal_diff;
}
foam_factor *= 10.0;
if (foam_factor > 1.0)
{
foam_factor = 1.0;
}
if (foam_factor <= 1.0 - definition->foam_coverage)
{
return COLOR_TRANSPARENT;
}
foam_factor = (foam_factor - (1.0 - definition->foam_coverage)) * definition->foam_coverage;
/* TODO Re-use base lighting status */
result = renderer->applyLightingToSurface(renderer, location, normal, &definition->foam_material);
result.r *= 2.0;
result.g *= 2.0;
result.b *= 2.0;
/* TODO This should be configurable */
if (foam_factor > 0.2)
{
result.a = 0.8;
}
else
{
result.a = 0.8 * (foam_factor / 0.2);
}
return result;
}
static int _alterLight(Renderer* renderer, LightDefinition* light, Vector3 at)
{
WaterDefinition* definition = renderer->water->definition;
double factor;
double base_height;
base_height = renderer->terrain->getWaterHeight(renderer);
if (at.y < base_height)
{
if (light->direction.y <= -0.00001)
{
factor = (base_height - at.y) / (-light->direction.y * definition->lighting_depth);
if (factor > 1.0)
{
factor = 1.0;
}
factor = 1.0 - factor;
light->color.r *= factor;
light->color.g *= factor;
light->color.b *= factor;
light->reflection *= factor;
return 1;
}
else
{
light->color = COLOR_BLACK;
return 1;
}
}
else
{
return 0;
}
}
/******************** Real ********************/
static HeightInfo _realGetHeightInfo(Renderer* renderer)
{
WaterDefinition* definition = renderer->water->definition;
HeightInfo info;
double noise_minvalue, noise_maxvalue;
info.base_height = renderer->terrain->getWaterHeight(renderer);
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definition->_waves_noise->getRange(&noise_minvalue, &noise_maxvalue);
info.min_height = info.base_height + noise_minvalue;
info.max_height = info.base_height + noise_maxvalue;
return info;
}
static double _realGetHeight(Renderer* renderer, double x, double z)
{
return _getHeight(renderer->water->definition, renderer->terrain->getWaterHeight(renderer), x, z);
}
static WaterResult _realGetResult(Renderer* renderer, double x, double z)
{
WaterDefinition* definition = renderer->water->definition;
WaterResult result;
RayCastingResult refracted;
Vector3 location, normal, look_direction;
Color color, foam;
double base_height, detail, depth;
base_height = renderer->terrain->getWaterHeight(renderer);
location.x = x;
location.y = _getHeight(definition, base_height, x, z);
location.z = z;
result.location = location;
detail = renderer->getPrecision(renderer, location) * 0.1;
if (detail < 0.00001)
{
detail = 0.00001;
}
normal = _getNormal(definition, base_height, location, detail);
look_direction = v3Normalize(v3Sub(location, renderer->getCameraLocation(renderer, location)));
/* Reflection */
if (definition->reflection == 0.0)
{
result.reflected = COLOR_BLACK;
}
else
{
result.reflected = renderer->rayWalking(renderer, location, _reflectRay(look_direction, normal), 1, 0, 1, 1).hit_color;
}
/* Transparency/refraction */
if (definition->transparency == 0.0)
{
result.refracted = COLOR_BLACK;
}
else
{
Color depth_color = definition->depth_color;
refracted = renderer->rayWalking(renderer, location, _refractRay(look_direction, normal), 1, 0, 1, 1);
depth = v3Norm(v3Sub(location, refracted.hit_location));
colorLimitPower(&depth_color, colorGetPower(&refracted.hit_color));
if (depth > definition->transparency_depth)
{
result.refracted = depth_color;
}
else
{
depth /= definition->transparency_depth;
result.refracted.r = refracted.hit_color.r * (1.0 - depth) + depth_color.r * depth;
result.refracted.g = refracted.hit_color.g * (1.0 - depth) + depth_color.g * depth;
result.refracted.b = refracted.hit_color.b * (1.0 - depth) + depth_color.b * depth;
result.refracted.a = 1.0;
}
}
/* Lighting from environment */
color = renderer->applyLightingToSurface(renderer, location, normal, &definition->material);
color.r += result.reflected.r * definition->reflection + result.refracted.r * definition->transparency;
color.g += result.reflected.g * definition->reflection + result.refracted.g * definition->transparency;
color.b += result.reflected.b * definition->reflection + result.refracted.b * definition->transparency;
/* Merge with foam */
foam = _getFoamMask(renderer, definition, location, normal, detail);
colorMask(&color, &foam);
/* Bring color to the camera */
color = renderer->applyMediumTraversal(renderer, location, color);
result.base = definition->material._rgb;
result.final = color;
return result;
}
/******************** Renderer ********************/
static WaterRenderer* _createRenderer()
{
WaterRenderer* result;
result = new WaterRenderer;
result->definition = (WaterDefinition*)WaterDefinitionClass.create();
result->getHeightInfo = _fakeGetHeightInfo;
result->getHeight = _fakeGetHeight;
result->getResult = _fakeGetResult;
return result;
}
static void _deleteRenderer(WaterRenderer* renderer)
{
WaterDefinitionClass.destroy(renderer->definition);
delete renderer;
}
static void _bindRenderer(Renderer* renderer, WaterDefinition* definition)
{
WaterDefinitionClass.copy(definition, renderer->water->definition);
renderer->water->getHeightInfo = _realGetHeightInfo;
renderer->water->getHeight = _realGetHeight;
renderer->water->getResult = _realGetResult;
lightingManagerRegisterFilter(renderer->lighting, (FuncLightingAlterLight)_alterLight, renderer);
}
StandardRenderer WaterRendererClass = {
(FuncObjectCreate)_createRenderer,
(FuncObjectDelete)_deleteRenderer,
(FuncObjectBind)_bindRenderer
};