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From Marco Jez, on behalf of Farshid Lashkari. Details from Marco's email: "I've just received an addition to osgParticle from Farshid Lashkari. It enhances the generation of texture coordinates on particles so that animated textures can be used, with the current frame of animation being computed from each particle's current age.

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Clients just have to call Particle::setTextureTile() and specify the number of
horizontal and vertical tiles that make the animation up in the texture image."
This commit is contained in:
Robert Osfield
2004-03-05 15:44:15 +00:00
parent 0a3384de64
commit 89d9ca11c9
2 changed files with 57 additions and 17 deletions
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50
src/osgParticle/Particle.cpp
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@@ -41,7 +41,13 @@ osgParticle::Particle::Particle()
angular_vel_(0, 0, 0),
t0_(0),
current_size_(0),
current_alpha_(0)
current_alpha_(0),
s_tile_(1.0f),
t_tile_(1.0f),
num_tile_(1),
cur_tile_(-1),
s_coord_(0.0f),
t_coord_(0.0f)
{
}
@@ -69,6 +75,16 @@ bool osgParticle::Particle::update(double dt)
return false;
}
//Compute the current texture tile based on our normalized age
int currentTile = static_cast<int>(x * num_tile_);
//If the current texture tile is different from previous, then compute new texture coords
if(currentTile != cur_tile_) {
cur_tile_ = currentTile;
s_coord_ = s_tile_ * fmod(cur_tile_ , 1.0 / s_tile_);
t_coord_ = 1.0 - t_tile_ * (static_cast<int>(cur_tile_ * t_tile_) + 1);
}
// compute the current values for size, alpha and color.
current_size_ = si_.get()->interpolate(x, sr_);
current_alpha_ = ai_.get()->interpolate(x, ar_);
@@ -115,13 +131,13 @@ void osgParticle::Particle::render(const osg::Vec3 &xpos, const osg::Vec3 &px, c
break;
case QUAD:
glTexCoord2f(0, 0);
glTexCoord2f(s_coord_, t_coord_);
glVertex3fv((xpos-(p1+p2)*R).ptr());
glTexCoord2f(1, 0);
glTexCoord2f(s_coord_+s_tile_, t_coord_);
glVertex3fv((xpos+(p1-p2)*R).ptr());
glTexCoord2f(1, 1);
glTexCoord2f(s_coord_+s_tile_, t_coord_+t_tile_);
glVertex3fv((xpos+(p1+p2)*R).ptr());
glTexCoord2f(0, 1);
glTexCoord2f(s_coord_, t_coord_+t_tile_);
glVertex3fv((xpos-(p1-p2)*R).ptr());
break;
@@ -131,13 +147,13 @@ void osgParticle::Particle::render(const osg::Vec3 &xpos, const osg::Vec3 &px, c
glMultMatrix(R.ptr());
// we must glBegin() and glEnd() here, because each particle is a single strip
glBegin(GL_TRIANGLE_STRIP);
glTexCoord2f(1, 1);
glTexCoord2f(s_coord_+s_tile_, t_coord_+t_tile_);
glVertex3fv((p1+p2).ptr());
glTexCoord2f(0, 1);
glTexCoord2f(s_coord_, t_coord_+t_tile_);
glVertex3fv((-p1+p2).ptr());
glTexCoord2f(1, 0);
glTexCoord2f(s_coord_+s_tile_, t_coord_);
glVertex3fv((p1-p2).ptr());
glTexCoord2f(0, 0);
glTexCoord2f(s_coord_, t_coord_);
glVertex3fv((-p1-p2).ptr());
glEnd();
glPopMatrix();
@@ -149,21 +165,21 @@ void osgParticle::Particle::render(const osg::Vec3 &xpos, const osg::Vec3 &px, c
glMultMatrix(R.ptr());
// we must glBegin() and glEnd() here, because each particle is a single fan
glBegin(GL_TRIANGLE_FAN);
glTexCoord2f(0.5f, 0.5f);
glTexCoord2f(s_coord_ + s_tile_ * 0.5f, t_coord_ + t_tile_ * 0.5f);
glVertex3f(0,0,0);
glTexCoord2f(hex_texcoord_x1, hex_texcoord_y1);
glTexCoord2f(s_coord_ + s_tile_ * hex_texcoord_x1, t_coord_ + t_tile_ * hex_texcoord_y1);
glVertex3fv((p1*cosPI3+p2*sinPI3).ptr());
glTexCoord2f(hex_texcoord_x2, hex_texcoord_y1);
glTexCoord2f(s_coord_ + s_tile_ * hex_texcoord_x2, t_coord_ + t_tile_ * hex_texcoord_y1);
glVertex3fv((-p1*cosPI3+p2*sinPI3).ptr());
glTexCoord2f(0, 0.5f);
glTexCoord2f(s_coord_, t_coord_ + t_tile_ * 0.5f);
glVertex3fv((-p1).ptr());
glTexCoord2f(hex_texcoord_x2, hex_texcoord_y2);
glTexCoord2f(s_coord_ + s_tile_ * hex_texcoord_x2, t_coord_ + t_tile_ * hex_texcoord_y2);
glVertex3fv((-p1*cosPI3-p2*sinPI3).ptr());
glTexCoord2f(hex_texcoord_x1, hex_texcoord_y2);
glTexCoord2f(s_coord_ + s_tile_ * hex_texcoord_x1, t_coord_ + t_tile_ * hex_texcoord_y2);
glVertex3fv((p1*cosPI3-p2*sinPI3).ptr());
glTexCoord2f(1, 0.5f);
glTexCoord2f(s_coord_ + s_tile_, t_coord_ + t_tile_ * 0.5f);
glVertex3fv((p1).ptr());
glTexCoord2f(hex_texcoord_x1, hex_texcoord_y1);
glTexCoord2f(s_coord_ + s_tile_ * hex_texcoord_x1, t_coord_ + t_tile_ * hex_texcoord_y1);
glVertex3fv((p1*cosPI3+p2*sinPI3).ptr());
glEnd();
glPopMatrix();