You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91 lines
3.5 KiB
C++
91 lines
3.5 KiB
C++
#include "waterutil.hpp"
|
|
|
|
#include <osg/Depth>
|
|
#include <osg/Geometry>
|
|
#include <osg/Material>
|
|
#include <osg/StateSet>
|
|
|
|
namespace SceneUtil
|
|
{
|
|
// disable nonsense test against a worldsize bb what will always pass
|
|
class WaterBoundCallback : public osg::Drawable::ComputeBoundingBoxCallback
|
|
{
|
|
osg::BoundingBox computeBound(const osg::Drawable&) const override { return osg::BoundingBox(); }
|
|
};
|
|
|
|
osg::ref_ptr<osg::Geometry> createWaterGeometry(float size, int segments, float textureRepeats)
|
|
{
|
|
osg::ref_ptr<osg::Vec3Array> verts (new osg::Vec3Array);
|
|
osg::ref_ptr<osg::Vec2Array> texcoords (new osg::Vec2Array);
|
|
|
|
// some drivers don't like huge triangles, so we do some subdivisons
|
|
// a paged solution would be even better
|
|
const float step = size/segments;
|
|
const float texCoordStep = textureRepeats / segments;
|
|
for (int x=0; x<segments; ++x)
|
|
{
|
|
for (int y=0; y<segments; ++y)
|
|
{
|
|
float x1 = -size/2.f + x*step;
|
|
float y1 = -size/2.f + y*step;
|
|
float x2 = x1 + step;
|
|
float y2 = y1 + step;
|
|
|
|
verts->push_back(osg::Vec3f(x1, y2, 0.f));
|
|
verts->push_back(osg::Vec3f(x1, y1, 0.f));
|
|
verts->push_back(osg::Vec3f(x2, y1, 0.f));
|
|
verts->push_back(osg::Vec3f(x2, y2, 0.f));
|
|
|
|
float u1 = x*texCoordStep;
|
|
float v1 = y*texCoordStep;
|
|
float u2 = u1 + texCoordStep;
|
|
float v2 = v1 + texCoordStep;
|
|
|
|
texcoords->push_back(osg::Vec2f(u1, v2));
|
|
texcoords->push_back(osg::Vec2f(u1, v1));
|
|
texcoords->push_back(osg::Vec2f(u2, v1));
|
|
texcoords->push_back(osg::Vec2f(u2, v2));
|
|
}
|
|
}
|
|
|
|
osg::ref_ptr<osg::Geometry> waterGeom (new osg::Geometry);
|
|
waterGeom->setVertexArray(verts);
|
|
waterGeom->setTexCoordArray(0, texcoords);
|
|
|
|
osg::ref_ptr<osg::Vec3Array> normal (new osg::Vec3Array);
|
|
normal->push_back(osg::Vec3f(0,0,1));
|
|
waterGeom->setNormalArray(normal, osg::Array::BIND_OVERALL);
|
|
|
|
waterGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,verts->size()));
|
|
waterGeom->setComputeBoundingBoxCallback(new WaterBoundCallback);
|
|
waterGeom->setCullingActive(false);
|
|
return waterGeom;
|
|
}
|
|
|
|
osg::ref_ptr<osg::StateSet> createSimpleWaterStateSet(float alpha, int renderBin)
|
|
{
|
|
osg::ref_ptr<osg::StateSet> stateset (new osg::StateSet);
|
|
|
|
osg::ref_ptr<osg::Material> material (new osg::Material);
|
|
material->setEmission(osg::Material::FRONT_AND_BACK, osg::Vec4f(0.f, 0.f, 0.f, 1.f));
|
|
material->setDiffuse(osg::Material::FRONT_AND_BACK, osg::Vec4f(1.f, 1.f, 1.f, alpha));
|
|
material->setAmbient(osg::Material::FRONT_AND_BACK, osg::Vec4f(1.f, 1.f, 1.f, 1.f));
|
|
material->setColorMode(osg::Material::OFF);
|
|
stateset->setAttributeAndModes(material, osg::StateAttribute::ON);
|
|
|
|
stateset->setMode(GL_BLEND, osg::StateAttribute::ON);
|
|
stateset->setMode(GL_CULL_FACE, osg::StateAttribute::OFF);
|
|
|
|
osg::ref_ptr<osg::Depth> depth (new osg::Depth);
|
|
depth->setWriteMask(false);
|
|
stateset->setAttributeAndModes(depth, osg::StateAttribute::ON);
|
|
|
|
stateset->setRenderBinDetails(renderBin, "RenderBin");
|
|
|
|
// Let the shader know we're dealing with simple water here.
|
|
stateset->addUniform(new osg::Uniform("simpleWater", true));
|
|
|
|
return stateset;
|
|
}
|
|
}
|