From f3bee81e7aaea55f7228ee463dafa2ddc482949f Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 3 Mar 2004 11:17:21 +0000
Subject: [PATCH] From Ruben, Added osgpointsprite examples.

---
 examples/osgpointsprite/GNUmakefile        | 18 ++++
 examples/osgpointsprite/GNUmakefile.inst   | 14 ++++
 examples/osgpointsprite/osgpointsprite.cpp | 96 ++++++++++++++++++++++
 3 files changed, 128 insertions(+)
 create mode 100644 examples/osgpointsprite/GNUmakefile
 create mode 100644 examples/osgpointsprite/GNUmakefile.inst
 create mode 100755 examples/osgpointsprite/osgpointsprite.cpp

diff --git a/examples/osgpointsprite/GNUmakefile b/examples/osgpointsprite/GNUmakefile
new file mode 100644
index 000000000..4c597781e
--- /dev/null
+++ b/examples/osgpointsprite/GNUmakefile
@@ -0,0 +1,18 @@
+TOPDIR = ../..
+include $(TOPDIR)/Make/makedefs 
+
+CXXFILES =\
+	osgpointsprite.cpp\
+
+LIBS     += -losgProducer -lProducer -losgText -losgGA -losgDB -losgUtil -losg $(GL_LIBS) $(X_LIBS) $(OTHER_LIBS) 
+
+INSTFILES = \
+	$(CXXFILES)\
+	GNUmakefile.inst=GNUmakefile
+
+EXEC = osgpointsprite
+
+INC +=  $(X_INC) 
+
+include $(TOPDIR)/Make/makerules 
+
diff --git a/examples/osgpointsprite/GNUmakefile.inst b/examples/osgpointsprite/GNUmakefile.inst
new file mode 100644
index 000000000..b56ee434d
--- /dev/null
+++ b/examples/osgpointsprite/GNUmakefile.inst
@@ -0,0 +1,14 @@
+TOPDIR = ../..
+include $(TOPDIR)/Make/makedefs
+
+CXXFILES =\
+	osgpointsprite.cpp\
+
+LIBS     += -losgProducer -lProducer -losgDB -losgText -losgUtil -losg $(GL_LIBS) $(X_LIBS) $(OTHER_LIBS) 
+
+EXEC = osgpointsprite
+
+INC += $(PRODUCER_INCLUDE_DIR) $(X_INC)
+LDFLAGS  += $(PRODUCER_LIB_DIR)
+
+include $(TOPDIR)/Make/makerules
diff --git a/examples/osgpointsprite/osgpointsprite.cpp b/examples/osgpointsprite/osgpointsprite.cpp
new file mode 100755
index 000000000..84152436e
--- /dev/null
+++ b/examples/osgpointsprite/osgpointsprite.cpp
@@ -0,0 +1,96 @@
+#include <osg/PointSprite>
+#include <osg/BlendFunc>
+#include <osg/StateAttribute>
+#include <osg/Point>
+#include <osg/Geometry>
+#include <osg/Texture2D>
+#include <osg/TexEnv>
+#include <osgDB/ReadFile>
+#include <osgProducer/Viewer>
+#include <osg/GLExtensions>
+#include <osg/TexEnv>
+
+osg::Geode *makeGalaxy(unsigned nvertices)
+{
+    osg::Geode *geode = new osg::Geode();
+    osg::Geometry *galaxy = new osg::Geometry();
+    osg::Vec3Array *vertices = new osg::Vec3Array();
+    osg::Vec4Array *colors = new osg::Vec4Array();
+    osg::Vec4 ini(1,1,0,1);
+    osg::Vec4 fin(0,0,1,1);
+
+    /** Formula for the two spirals */
+    for (unsigned i=0;i<nvertices/2;i++) {
+        float val = (i*2/(float)nvertices * 2 * 3.14159265359);
+        float modx1 = rand() / (float)RAND_MAX*2;
+        float mody1 = rand() / (float)RAND_MAX*2;
+        float modx2 = rand() / (float)RAND_MAX*2;
+        float mody2 = rand() / (float)RAND_MAX*2;
+        float modz1 = ((rand()-RAND_MAX/2) / (float)(RAND_MAX))*3/(val+1);
+        float modz2 = ((rand()-RAND_MAX/2) / (float)(RAND_MAX))*3/(val+1);
+        vertices->push_back(osg::Vec3(cos(val)*val+modx1, sin(val)*val+mody1, modz1));
+        vertices->push_back(osg::Vec3(-cos(val)*val+modx2, -sin(val)*val+mody2, modz2));
+
+        colors->push_back(ini+(fin-ini)*(i*2/(float)nvertices));
+        colors->push_back(ini+(fin-ini)*(i*2/(float)nvertices));
+    }
+    galaxy->setVertexArray(vertices);
+    galaxy->setColorArray(colors);
+    galaxy->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
+    galaxy->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POINTS, 0, nvertices));
+    geode->addDrawable(galaxy);
+    return geode;
+}
+
+osg::StateSet* makeStateSet(float size)
+{
+    osg::StateSet *set = new osg::StateSet();
+
+    /// Setup cool blending
+    set->setMode(GL_BLEND, osg::StateAttribute::ON);
+    osg::BlendFunc *fn = new osg::BlendFunc();
+    fn->setFunction(osg::BlendFunc::SRC_ALPHA, osg::BlendFunc::DST_ALPHA);
+    set->setAttributeAndModes(fn, osg::StateAttribute::ON);
+
+    /// Setup the point sprites
+    osg::PointSprite *sprite = new osg::PointSprite();
+    set->setTextureAttributeAndModes(0, sprite, osg::StateAttribute::ON);
+
+    /// Give some size to the points to be able to see the sprite
+    osg::Point *point = new osg::Point();
+    point->setSize(size);
+    set->setAttributeAndModes(point, osg::StateAttribute::ON);
+
+    /// Disable depth test to avoid sort problems and Lighting
+    set->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF);
+    set->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
+
+    /// The texture for the sprites
+    osg::Texture2D *tex = new osg::Texture2D();
+    tex->setImage(osgDB::readImageFile("Images/particle.rgb"));
+    set->setTextureAttributeAndModes(0, tex, osg::StateAttribute::ON);
+
+    return set;
+}
+
+int main(int, char *[])
+{
+    osgProducer::Viewer viewer;
+
+    /// Make the galaxy of points
+    osg::Node *node = makeGalaxy(5000);
+
+    node->setStateSet(makeStateSet(10.0f));
+
+    viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
+    viewer.setSceneData(node);
+
+    viewer.realize();
+    while (!viewer.done())
+    {
+        viewer.sync();
+        viewer.update();
+        viewer.frame();
+    }
+}
+