FGFS-4.1/OpenSceneGraph
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Implement positioning of cells via vertex attribute.

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This commit is contained in:
Robert Osfield 2006-04-12 11:59:07 +00:00
parent 19a1d83f33
commit 7747971b6a
4 changed files with 55 additions and 72 deletions
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3
examples/osgprecipitation/line_rain.vert
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@ -1,4 +1,3 @@
uniform vec3 position;
uniform vec3 dv_i;
uniform vec3 dv_j;
uniform vec3 dv_k;
@ -17,7 +16,7 @@ varying vec2 texCoord;
void main(void)
{
vec3 pos = position + (gl_Vertex.x*dv_i) + (dv_j * gl_Vertex.y);
vec3 pos = gl_Normal.xyz + (gl_Vertex.x*dv_i) + (dv_j * gl_Vertex.y);
float offset = gl_Vertex.z;
texCoord = gl_MultiTexCoord0.xy;

118
examples/osgprecipitation/osgprecipitation.cpp
View File

@ -45,6 +45,9 @@ public:
osg::Geometry* getInternalGeometry() { return _internalGeometry.get(); }
void setPosition(const osg::Vec3& position) { _position = position; }
const osg::Vec3& getPosition() const { return _position; }
virtual void compileGLObjects(osg::State& state) const
{
@ -62,6 +65,8 @@ public:
{
if (!_internalGeometry) return;
glNormal3fv(_position.ptr());
_internalGeometry->draw(state);
}
@ -72,6 +77,7 @@ public:
protected:
osg::Vec3 _position;
osg::ref_ptr<osg::Geometry> _internalGeometry;
};
@ -295,6 +301,7 @@ void setUpGeometries(unsigned int numParticles)
quad_stateset = new osg::StateSet;
osg::Program* program = new osg::Program;
quad_stateset->setAttribute(program);
quad_stateset->setRenderBinDetails(13,"DepthSortedBin");
// get shaders from source
program->addShader(osg::Shader::readShaderFile(osg::Shader::VERTEX, osgDB::findDataFile("quad_rain.vert")));
@ -310,6 +317,7 @@ void setUpGeometries(unsigned int numParticles)
osg::Program* program = new osg::Program;
line_stateset->setAttribute(program);
line_stateset->setRenderBinDetails(12,"DepthSortedBin");
// get shaders from source
program->addShader(osg::Shader::readShaderFile(osg::Shader::VERTEX, osgDB::findDataFile("line_rain.vert")));
@ -335,6 +343,7 @@ void setUpGeometries(unsigned int numParticles)
point_stateset->setTextureAttributeAndModes(0, sprite, osg::StateAttribute::ON);
point_stateset->setMode(GL_VERTEX_PROGRAM_POINT_SIZE, osg::StateAttribute::ON);
point_stateset->setRenderBinDetails(11,"DepthSortedBin");
}
@ -347,8 +356,17 @@ osg::Node* createRainEffect(const osg::BoundingBox& bb, const osg::Vec3& velocit
{
osg::LOD* lod = new osg::LOD;
float nearDistance = 50.0;
float farDistance = 200.0;
// time taken to get from start to the end of cycle
float period = fabs((bb.zMax()-bb.zMin()) / velocity.z());
// distance between start point and end of cyclce
osg::Vec3 position(bb.xMin(), bb.yMin(), bb.zMax());
osg::Vec3 dv_i( bb.xMax()-bb.xMin(), 0.0f, 0.0f );
osg::Vec3 dv_j( 0.0f, bb.yMax()-bb.yMin(), 0.0f );
osg::Vec3 dv_k( velocity * period );
float nearDistance = 25.0;
float farDistance = 100.0;
// high res LOD.
{
@ -358,6 +376,7 @@ osg::Node* createRainEffect(const osg::BoundingBox& bb, const osg::Vec3& velocit
highres_geode->addDrawable(geometry);
geometry->setPosition(position);
geometry->setInitialBound(bb);
geometry->setInternalGeometry(quad_geometry.get());
geometry->setStateSet(quad_stateset.get());
@ -373,6 +392,7 @@ osg::Node* createRainEffect(const osg::BoundingBox& bb, const osg::Vec3& velocit
lowres_geode->addDrawable(geometry);
geometry->setPosition(position);
geometry->setInitialBound(bb);
geometry->setInternalGeometry(point_geometry.get());
geometry->setStateSet(point_stateset.get());
@ -381,68 +401,14 @@ osg::Node* createRainEffect(const osg::BoundingBox& bb, const osg::Vec3& velocit
}
// set up state.
osg::StateSet* stateset = lod->getOrCreateStateSet();
{
// time taken to get from start to the end of cycle
float period = fabs((bb.zMax()-bb.zMin()) / velocity.z());
// distance between start point and end of cyclce
osg::Vec3 position(bb.xMin(), bb.yMin(), bb.zMax());
osg::Vec3 dv_i( bb.xMax()-bb.xMin(), 0.0f, 0.0f );
osg::Vec3 dv_j( 0.0f, bb.yMax()-bb.yMin(), 0.0f );
osg::Vec3 dv_k( velocity * period );
// set up uniforms
osg::Uniform* position_Uniform = new osg::Uniform("position",position);
static osg::Uniform* dv_i_Uniform = new osg::Uniform("dv_i",dv_i);
static osg::Uniform* dv_j_Uniform = new osg::Uniform("dv_j",dv_j);
static osg::Uniform* dv_k_Uniform = new osg::Uniform("dv_k",dv_k);
static osg::Uniform* inversePeriodUniform = new osg::Uniform("inversePeriod",1.0f/period);
static osg::Uniform* startTime = new osg::Uniform("startTime",0.0f);
stateset->addUniform(position_Uniform); // vec3
stateset->addUniform(dv_i_Uniform); // vec3 could be float
stateset->addUniform(dv_j_Uniform); // vec3 could be float
stateset->addUniform(dv_k_Uniform); // vec3
stateset->addUniform(inversePeriodUniform); // float
stateset->addUniform(startTime); // float
// make it render after the normal transparent bin
stateset->setRenderBinDetails(11,"DepthSortedBin");
#if 0
stateset->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
stateset->setMode(GL_BLEND, osg::StateAttribute::ON);
static osg::Uniform* baseTextureSampler = new osg::Uniform("baseTexture",0);
stateset->addUniform(baseTextureSampler);
static osg::Texture2D* texture = new osg::Texture2D(createSpotLightImage(osg::Vec4(1.0f,1.0f,1.0f,1.0f),osg::Vec4(1.0f,1.0f,1.0f,0.0f),32,1.0));
stateset->setTextureAttribute(0, texture);
stateset->addUniform(new osg::Uniform("particleColour", osg::Vec4(0.6,0.6,0.6,1.0)));
stateset->addUniform(new osg::Uniform("particleSize", 0.01f));
osg::Uniform* previousModelViewUniform = new osg::Uniform("previousModelViewMatrix",osg::Matrix());
stateset->addUniform(previousModelViewUniform);
lod->setCullCallback(new CullCallback(previousModelViewUniform));
#endif
}
return lod;
}
osg::Node* createCellRainEffect(const osg::BoundingBox& bb, const osg::Vec3& velocity, unsigned int numParticles)
{
unsigned int numX = 80;
unsigned int numY = 80;
unsigned int numX = 100;
unsigned int numY = 100;
unsigned int numCells = numX*numY;
unsigned int numParticlesPerCell = numParticles/numCells;
@ -480,6 +446,30 @@ osg::Node* createCellRainEffect(const osg::BoundingBox& bb, const osg::Vec3& vel
#if 1
osg::StateSet* stateset = group->getOrCreateStateSet();
// time taken to get from start to the end of cycle
float period = fabs((bb.zMax()-bb.zMin()) / velocity.z());
// distance between start point and end of cyclce
osg::Vec3 dv_i( (bb.xMax()-bb.xMin())/(float)(numX), 0.0f, 0.0f );
osg::Vec3 dv_j( 0.0f, (bb.yMax()-bb.yMin())/(float)(numY), 0.0f );
osg::Vec3 dv_k( velocity * period );
// set up uniforms
// osg::Uniform* position_Uniform = new osg::Uniform("position",position);
osg::Uniform* dv_i_Uniform = new osg::Uniform("dv_i",dv_i);
osg::Uniform* dv_j_Uniform = new osg::Uniform("dv_j",dv_j);
osg::Uniform* dv_k_Uniform = new osg::Uniform("dv_k",dv_k);
osg::Uniform* inversePeriodUniform = new osg::Uniform("inversePeriod",1.0f/period);
osg::Uniform* startTime = new osg::Uniform("startTime",0.0f);
//stateset->addUniform(position_Uniform); // vec3
stateset->addUniform(dv_i_Uniform); // vec3 could be float
stateset->addUniform(dv_j_Uniform); // vec3 could be float
stateset->addUniform(dv_k_Uniform); // vec3
stateset->addUniform(inversePeriodUniform); // float
stateset->addUniform(startTime); // float
stateset->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
stateset->setMode(GL_BLEND, osg::StateAttribute::ON);
@ -490,7 +480,7 @@ osg::Node* createCellRainEffect(const osg::BoundingBox& bb, const osg::Vec3& vel
stateset->setTextureAttribute(0, texture);
stateset->addUniform(new osg::Uniform("particleColour", osg::Vec4(0.6,0.6,0.6,1.0)));
stateset->addUniform(new osg::Uniform("particleSize", 0.01f));
stateset->addUniform(new osg::Uniform("particleSize", 0.02f));
osg::Uniform* previousModelViewUniform = new osg::Uniform("previousModelViewMatrix",osg::Matrix());
stateset->addUniform(previousModelViewUniform);
@ -506,8 +496,8 @@ osg::Node* createModel(osg::Node* loadedModel, bool /*useShaders*/)
osg::Group* group = new osg::Group;
osg::BoundingBox bb(0.0, 0.0, 0.0, 100.0, 100.0, 100.0);
osg::Vec3 velocity(0.0,2.0,-5.0);
unsigned int numParticles = 10000000;
osg::Vec3 velocity(0.0,2.0,-8.0);
unsigned int numParticles = 50000000;
if (loadedModel)
{
@ -540,12 +530,8 @@ osg::Node* createModel(osg::Node* loadedModel, bool /*useShaders*/)
}
#if 0
setUpGeometries(numParticles);
group->addChild(createRainEffect(bb, velocity));
#else
group->addChild(createCellRainEffect(bb, velocity, numParticles));
#endif
return group;
}

3
examples/osgprecipitation/point_rain.vert
View File

@ -1,4 +1,3 @@
uniform vec3 position;
uniform vec3 dv_i;
uniform vec3 dv_j;
uniform vec3 dv_k;
@ -15,7 +14,7 @@ varying vec2 texCoord;
void main(void)
{
vec3 pos = position + (gl_Vertex.x*dv_i) + (dv_j * gl_Vertex.y);
vec3 pos = gl_Normal.xyz + (gl_Vertex.x*dv_i) + (dv_j * gl_Vertex.y);
texCoord = gl_MultiTexCoord0.xy;

3
examples/osgprecipitation/quad_rain.vert
View File

@ -1,4 +1,3 @@
uniform vec3 position;
uniform vec3 dv_i;
uniform vec3 dv_j;
uniform vec3 dv_k;
@ -17,7 +16,7 @@ varying vec2 texCoord;
void main(void)
{
vec3 pos = position + (gl_Vertex.x*dv_i) + (dv_j * gl_Vertex.y);
vec3 pos = gl_Normal.xyz + (gl_Vertex.x*dv_i) + (dv_j * gl_Vertex.y);
float offset = gl_Vertex.z;
texCoord = gl_MultiTexCoord0.xy;