FGFS-4.1/OpenSceneGraph
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Added support for point sprite particle effects.

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This commit is contained in:
Robert Osfield
2006-04-11 13:22:59 +00:00
parent e15c67b9cd
commit 9faf5f9496
3 changed files with 26 additions and 6 deletions
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17
examples/osgprecipitation/osgprecipitation.cpp
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@@ -21,6 +21,8 @@
#include <osg/PointSprite>
#include <osg/Program>
#include <osg/Fog>
#include <osg/Point>
#include <osg/PointSprite>
#include <osg/io_utils>
float random(float min,float max) { return min + (max-min)*(float)rand()/(float)RAND_MAX; }
@@ -252,7 +254,7 @@ osg::Node* createRainEffect(const osg::BoundingBox& bb, const osg::Vec3& velocit
osg::Geometry* line_geometry = 0;
osg::Geometry* point_geometry = 0;
#if 1
#if 0
quad_geometry = new PrecipitationGeometry;
quad_geometry->setUseVertexBufferObjects(true);
quad_geometry->setInitialBound(bb);
@@ -269,7 +271,7 @@ osg::Node* createRainEffect(const osg::BoundingBox& bb, const osg::Vec3& velocit
}
#endif
#if 0
#if 0
line_geometry = new PrecipitationGeometry;
line_geometry->setUseVertexBufferObjects(true);
line_geometry->setInitialBound(bb);
@@ -287,7 +289,7 @@ osg::Node* createRainEffect(const osg::BoundingBox& bb, const osg::Vec3& velocit
#endif
#if 0
#if 1
point_geometry = new PrecipitationGeometry;
point_geometry->setUseVertexBufferObjects(true);
point_geometry->setInitialBound(bb);
@@ -300,7 +302,14 @@ osg::Node* createRainEffect(const osg::BoundingBox& bb, const osg::Vec3& velocit
// get shaders from source
program->addShader(osg::Shader::readShaderFile(osg::Shader::VERTEX, osgDB::findDataFile("point_rain.vert")));
program->addShader(osg::Shader::readShaderFile(osg::Shader::FRAGMENT, osgDB::findDataFile("point_rain.frag")));
program->addShader(osg::Shader::readShaderFile(osg::Shader::FRAGMENT, osgDB::findDataFile("rain.frag")));
/// Setup the point sprites
osg::PointSprite *sprite = new osg::PointSprite();
point_stateset->setTextureAttributeAndModes(0, sprite, osg::StateAttribute::ON);
point_stateset->setMode(GL_VERTEX_PROGRAM_POINT_SIZE, osg::StateAttribute::ON);
}
#endif

4
examples/osgprecipitation/point_rain.frag
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@@ -1,8 +1,8 @@
uniform sampler2D baseTexture;
uniform vec4 particleColour;
varying vec2 texCoord;
varying vec4 colour;
void main (void)
{
gl_FragColor = particleColour * texture2D( baseTexture, texCoord);
gl_FragColor = colour * texture2D( baseTexture, texCoord);
}

11
examples/osgprecipitation/point_rain.vert
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@@ -5,18 +5,29 @@ uniform vec3 dv_k;
uniform float inversePeriod;
uniform float startTime;
uniform vec4 particleColour;
uniform float osg_FrameTime;
varying vec4 colour;
varying vec2 texCoord;
void main(void)
{
const float particleSize = 0.01;
vec3 pos = position + (gl_Vertex.x*dv_i) + (dv_j * gl_Vertex.y);
texCoord = gl_MultiTexCoord0.xy;
vec3 v_current = pos + dv_k * fract( (osg_FrameTime - startTime)*inversePeriod - gl_Vertex.z);
colour = particleColour;
gl_Position = gl_ModelViewProjectionMatrix * vec4(v_current,1.0);
float pointSize = min(abs(1280*particleSize / gl_Position.w), 20.0);
gl_PointSize = max(ceil(pointSize),2);
colour.a = 0.2+(pointSize)/(gl_PointSize);
}