#endif
#include <osg/AlphaFunc>
+#include <osg/Depth>
#include <osg/Program>
#include <osg/Uniform>
#include <osg/ref_ptr>
#include <simgear/math/sg_random.h>
#include <simgear/misc/sg_path.hxx>
#include <simgear/misc/PathOptions.hxx>
+#include <simgear/props/props.hxx>
#include <simgear/scene/model/model.hxx>
+#include <simgear/scene/model/SGReaderWriterXMLOptions.hxx>
#include <simgear/scene/util/StateAttributeFactory.hxx>
#include <simgear/scene/util/SGUpdateVisitor.hxx>
#include <algorithm>
+#include <osg/BlendFunc>
#include <osg/GLU>
+#include <osg/ShadeModel>
#include "cloudfield.hxx"
#include "newcloud.hxx"
using namespace simgear;
using namespace osg;
-typedef std::map<std::string, osg::ref_ptr<osg::StateSet> > StateSetMap;
-typedef std::vector< osg::ref_ptr<osg::Geode> > GeodeList;
-typedef std::map<std::string, GeodeList*> CloudMap;
+namespace
+{
+typedef std::map<std::string, osg::ref_ptr<Effect> > EffectMap;
+EffectMap effectMap;
+}
-static StateSetMap cloudTextureMap;
-static CloudMap cloudMap;
double SGNewCloud::sprite_density = 1.0;
-int SGNewCloud::num_flavours = 10;
-
-static char vertexShaderSource[] =
- "#version 120\n"
- "\n"
- "varying float fogFactor;\n"
- "attribute float textureIndexX;\n"
- "attribute float textureIndexY;\n"
- "attribute float wScale;\n"
- "attribute float hScale;\n"
- "attribute float shade;\n"
- "attribute float cloud_height;\n"
- "void main(void)\n"
- "{\n"
- " gl_TexCoord[0] = gl_MultiTexCoord0 + vec4(textureIndexX, textureIndexY, 0.0, 0.0);\n"
- " vec4 ep = gl_ModelViewMatrixInverse * vec4(0.0,0.0,0.0,1.0);\n"
- " vec4 l = gl_ModelViewMatrixInverse * vec4(0.0,0.0,1.0,1.0);\n"
- " vec3 u = normalize(ep.xyz - l.xyz);\n"
-// Find a rotation matrix that rotates 1,0,0 into u. u, r and w are
-// the columns of that matrix.
- " vec3 absu = abs(u);\n"
- " vec3 r = normalize(vec3(-u.y, u.x, 0));\n"
- " vec3 w = cross(u, r);\n"
-// Do the matrix multiplication by [ u r w pos]. Assume no
-// scaling in the homogeneous component of pos.
- " gl_Position = vec4(0.0, 0.0, 0.0, 1.0);\n"
- " gl_Position.xyz = gl_Vertex.x * u * wScale;\n"
- " gl_Position.xyz += gl_Vertex.y * r * hScale;\n"
- " gl_Position.xyz += gl_Vertex.z * w;\n"
- " gl_Position.xyz += gl_Color.xyz;\n"
-// Determine a lighting normal based on the vertex position from the
-// center of the cloud, so that sprite on the opposite side of the cloud to the sun are darker.
- " float n = dot(normalize(gl_LightSource[0].position.xyz), normalize(mat3x3(gl_ModelViewMatrix) * gl_Position.xyz));\n"
-// Determine the position - used for fog and shading calculations
- " vec3 ecPosition = vec3(gl_ModelViewMatrix * gl_Position);\n"
- " float fogCoord = abs(ecPosition.z);\n"
- " float fract = smoothstep(0.0, cloud_height, gl_Position.z + cloud_height);\n"
-// Final position of the sprite
- " gl_Position = gl_ModelViewProjectionMatrix * gl_Position;\n"
-// Limit the normal range from [0,1.0], and apply the shading (vertical factor)
- " n = min(smoothstep(-0.5, 0.5, n), shade * (1.0 - fract) + fract);\n"
-// This lighting normal is then used to mix between almost pure ambient (0) and diffuse (1.0) light
- " vec4 backlight = 0.9 * gl_LightSource[0].ambient + 0.1 * gl_LightSource[0].diffuse;\n"
- " gl_FrontColor = mix(backlight, gl_LightSource[0].diffuse, n);\n"
- " gl_FrontColor += gl_FrontLightModelProduct.sceneColor;\n"
-// As we get within 100m of the sprite, it is faded out
- " gl_FrontColor.a = smoothstep(10.0, 100.0, fogCoord);\n"
- " gl_BackColor = gl_FrontColor;\n"
-// Fog doesn't affect clouds as much as other objects.
- " fogFactor = exp( -gl_Fog.density * fogCoord * 0.5);\n"
- " fogFactor = clamp(fogFactor, 0.0, 1.0);\n"
- "}\n";
-
-static char fragmentShaderSource[] =
- "uniform sampler2D baseTexture; \n"
- "varying float fogFactor;\n"
- "\n"
- "void main(void)\n"
- "{\n"
- " vec4 base = texture2D( baseTexture, gl_TexCoord[0].st);\n"
- " vec4 finalColor = base * gl_Color;\n"
- " gl_FragColor = mix(gl_Fog.color, finalColor, fogFactor );\n"
- "}\n";
-
-class SGCloudFogUpdateCallback : public osg::StateAttribute::Callback {
- public:
- virtual void operator () (osg::StateAttribute* sa, osg::NodeVisitor* nv)
- {
- SGUpdateVisitor* updateVisitor = static_cast<SGUpdateVisitor*>(nv);
- osg::Fog* fog = static_cast<osg::Fog*>(sa);
- fog->setMode(osg::Fog::EXP);
- fog->setColor(updateVisitor->getFogColor().osg());
- fog->setDensity(updateVisitor->getFogExpDensity());
- }
-};
SGNewCloud::SGNewCloud(string type,
const SGPath &tex_path,
texture(tex),
name(type)
{
- // Create a new StateSet for the texture, if required.
- StateSetMap::iterator iter = cloudTextureMap.find(texture);
-
- if (iter == cloudTextureMap.end()) {
- stateSet = new osg::StateSet;
-
- osg::ref_ptr<osgDB::ReaderWriter::Options> options = makeOptionsFromPath(tex_path);
-
- osg::Texture2D *tex = new osg::Texture2D;
- tex->setWrap( osg::Texture2D::WRAP_S, osg::Texture2D::CLAMP );
- tex->setWrap( osg::Texture2D::WRAP_T, osg::Texture2D::CLAMP );
- tex->setImage(osgDB::readImageFile(texture, options.get()));
-
- StateAttributeFactory* attribFactory = StateAttributeFactory::instance();
-
- stateSet->setMode(GL_LIGHTING, osg::StateAttribute::ON);
- stateSet->setMode(GL_CULL_FACE, osg::StateAttribute::OFF);
-
- // Fog handling
- osg::Fog* fog = new osg::Fog;
- fog->setUpdateCallback(new SGCloudFogUpdateCallback);
- stateSet->setAttributeAndModes(fog);
- stateSet->setDataVariance(osg::Object::DYNAMIC);
-
- stateSet->setAttributeAndModes(attribFactory->getSmoothShadeModel());
- stateSet->setAttributeAndModes(attribFactory->getStandardBlendFunc());
-
- stateSet->setTextureAttributeAndModes(0, tex, osg::StateAttribute::ON );
- stateSet->setRenderBinDetails(osg::StateSet::TRANSPARENT_BIN, "DepthSortedBin");
-
- static ref_ptr<AlphaFunc> alphaFunc;
- static ref_ptr<Program> program;
- static ref_ptr<Uniform> baseTextureSampler;
- static ref_ptr<Material> material;
-
- // Generate the shader etc, if we don't already have one.
- if (!program.valid()) {
- alphaFunc = new AlphaFunc;
- alphaFunc->setFunction(AlphaFunc::GREATER,0.001f);
- program = new Program;
- baseTextureSampler = new osg::Uniform("baseTexture", 0);
- Shader* vertex_shader = new Shader(Shader::VERTEX, vertexShaderSource);
- program->addShader(vertex_shader);
- program->addBindAttribLocation("textureIndexX", CloudShaderGeometry::TEXTURE_INDEX_X);
- program->addBindAttribLocation("textureIndexY", CloudShaderGeometry::TEXTURE_INDEX_Y);
- program->addBindAttribLocation("wScale", CloudShaderGeometry::WIDTH);
- program->addBindAttribLocation("hScale", CloudShaderGeometry::HEIGHT);
- program->addBindAttribLocation("shade", CloudShaderGeometry::SHADE);
- program->addBindAttribLocation("cloud_height", CloudShaderGeometry::CLOUD_HEIGHT);
-
- Shader* fragment_shader = new Shader(Shader::FRAGMENT, fragmentShaderSource);
- program->addShader(fragment_shader);
- material = new Material;
- // Don´t track vertex color
- material->setColorMode(Material::OFF);
-
- // We don't actually use the material information either - see shader.
- material->setAmbient(Material::FRONT_AND_BACK,
- Vec4(0.5f, 0.5f, 0.5f, 1.0f));
- material->setDiffuse(Material::FRONT_AND_BACK,
- Vec4(0.5f, 0.5f, 0.5f, 1.0f));
- }
-
- stateSet->setAttributeAndModes(alphaFunc.get());
- stateSet->setAttribute(program.get());
- stateSet->addUniform(baseTextureSampler.get());
- stateSet->setMode(GL_VERTEX_PROGRAM_TWO_SIDE, StateAttribute::ON);
- stateSet->setAttribute(material.get());
-
- // Add the newly created texture to the map for use later.
- cloudTextureMap.insert(StateSetMap::value_type(texture, stateSet));
+ // Create a new Effect for the texture, if required.
+ EffectMap::iterator iter = effectMap.find(texture);
+ if (iter == effectMap.end()) {
+ SGPropertyNode_ptr pcloudEffect = new SGPropertyNode;
+ makeChild(pcloudEffect, "inherits-from")->setValue("Effects/cloud");
+ setValue(makeChild(makeChild(makeChild(pcloudEffect, "parameters"),
+ "texture"),
+ "image"),
+ texture);
+ ref_ptr<osgDB::ReaderWriter::Options> options
+ = makeOptionsFromPath(tex_path);
+ ref_ptr<SGReaderWriterXMLOptions> sgOptions
+ = new SGReaderWriterXMLOptions(*options.get());
+ if ((effect = makeEffect(pcloudEffect, true, sgOptions.get())))
+ effectMap.insert(EffectMap::value_type(texture, effect));
} else {
- stateSet = iter->second.get();
+ effect = iter->second.get();
}
-
- quad = createOrthQuad(min_sprite_width, min_sprite_height, num_textures_x, num_textures_y);
+ quad = createOrthQuad(min_sprite_width, min_sprite_height,
+ num_textures_x, num_textures_y);
}
SGNewCloud::~SGNewCloud() {
return geom;
}
+#if 0
// return a random number between -n/2 and n/2, tending to 0
static float Rnd(float n) {
return n * (-0.5f + (sg_random() + sg_random()) / 2.0f);
}
+#endif
-osg::ref_ptr<Geode> SGNewCloud::genCloud() {
+osg::ref_ptr<EffectGeode> SGNewCloud::genCloud() {
- CloudMap::iterator iter = cloudMap.find(name);
- osg::ref_ptr<osg::Geode> geode;
+ osg::ref_ptr<EffectGeode> geode = new EffectGeode;
+
+ CloudShaderGeometry* sg = new CloudShaderGeometry(num_textures_x, num_textures_y, max_width, max_height);
- // We generate up to num_flavours of different versions
- // of the same cloud before we start re-using them. This
- // allows us to strike a balance between performance and
- // visual complexity.
+ // Determine how big this specific cloud instance is. Note that we subtract
+ // the sprite size because the width/height is used to define the limits of
+ // the center of the sprites, not their edges.
+ float width = min_width + sg_random() * (max_width - min_width) - min_sprite_width;
+ float height = min_height + sg_random() * (max_height - min_height) - min_sprite_height;
- GeodeList* g = (*iter).second;
-
- if (iter == cloudMap.end() || g->size() < num_flavours)
- {
- geode = new Geode;
-
- CloudShaderGeometry* sg = new CloudShaderGeometry(num_textures_x, num_textures_y, max_width, max_height);
-
- // Determine how big this specific cloud instance is. Note that we subtract
- // the sprite size because the width/height is used to define the limits of
- // the center of the sprites, not their edges.
- float width = min_width + sg_random() * (max_width - min_width) - min_sprite_width;
- float height = min_height + sg_random() * (max_height - min_height) - min_sprite_height;
-
- // Determine the cull distance. This is used to remove sprites that are too close together.
- // The value is squared as we use vector calculations.
- float cull_distance_squared = min_sprite_height * min_sprite_height * 0.1f;
-
- // The number of sprites we actually used is a function of the (user-controlled) density
- int n_sprites = num_sprites * sprite_density;
-
- for (int i = 0; i < n_sprites; i++)
- {
- // Determine the position of the sprite. Rather than being completely random,
- // we place them on the surface of a distorted sphere. However, we place
- // the first and second sprites on the top and bottom, and the third in the
- // center of the sphere (and at maximum size) to ensure good coverage and
- // reduce the chance of there being "holes" in our cloud.
- float x, y, z;
-
- if (i == 0) {
- x = 0;
- y = 0;
- z = height * 0.5f;
- } else if (i == 1) {
- x = 0;
- y = 0;
- z = - height * 0.5f;
- } else if (i == 2) {
- x = 0;
- y = 0;
- z = 0;
- } else {
- double theta = sg_random() * SGD_2PI;
- double elev = sg_random() * SGD_PI;
- x = width * cos(theta) * 0.5f * sin(elev);
- y = width * sin(theta) * 0.5f * sin(elev);
- z = height * cos(elev) * 0.5f;
- }
-
- SGVec3f *pos = new SGVec3f(x, y, z);
+ // Determine the cull distance. This is used to remove sprites that are too close together.
+ // The value is squared as we use vector calculations.
+ float cull_distance_squared = min_sprite_height * min_sprite_height * 0.1f;
+
+ // The number of sprites we actually use is a function of the (user-controlled) density
+ int n_sprites = num_sprites * sprite_density * (0.5 + sg_random());
- // Determine the height and width as scaling factors on the minimum size (used to create the quad)
- float sprite_width = 1.0f + sg_random() * (max_sprite_width - min_sprite_width) / min_sprite_width;
- float sprite_height = 1.0f + sg_random() * (max_sprite_height - min_sprite_height) / min_sprite_height;
-
- if (i == 2) {
- // The center sprite is always maximum size to fill up any holes.
- sprite_width = 1.0f + (max_sprite_width - min_sprite_width) / min_sprite_width;
- sprite_height = 1.0f + (max_sprite_height - min_sprite_height) / min_sprite_height;
- }
-
- // Determine the sprite texture indexes;
- int index_x = (int) floor(sg_random() * num_textures_x);
- if (index_x == num_textures_x) { index_x--; }
-
- int index_y = (int) floor(sg_random() * num_textures_y);
- if (index_y == num_textures_y) { index_y--; }
-
- sg->addSprite(*pos,
- index_x,
- index_y,
- sprite_width,
- sprite_height,
- bottom_shade,
- cull_distance_squared,
- height * 0.5f);
+ for (int i = 0; i < n_sprites; i++)
+ {
+ // Determine the position of the sprite. Rather than being completely random,
+ // we place them on the surface of a distorted sphere. However, we place
+ // the first sprite in the center of the sphere (and at maximum size) to
+ // ensure good coverage and reduce the chance of there being "holes" in our
+
+ float x, y, z;
+
+ if (i == 0) {
+ x = 0;
+ y = 0;
+ z = 0;
+ } else {
+ double theta = sg_random() * SGD_2PI;
+ double elev = sg_random() * SGD_PI;
+ x = width * cos(theta) * 0.5f * sin(elev);
+ y = width * sin(theta) * 0.5f * sin(elev);
+ z = height * cos(elev) * 0.5f;
}
-
- sg->setGeometry(quad);
- geode->addDrawable(sg);
- geode->setName("3D cloud");
- geode->setStateSet(stateSet.get());
-
- if (iter == cloudMap.end())
+ // Determine the height and width as scaling factors on the minimum size (used to create the quad).
+ float sprite_width = 1.0f + sg_random() * (max_sprite_width - min_sprite_width) / min_sprite_width;
+ float sprite_height = 1.0f + sg_random() * (max_sprite_height - min_sprite_height) / min_sprite_height;
+
+ // Sprites are never taller than square.
+ if (sprite_height * min_sprite_height > sprite_width * min_sprite_width)
{
- // This is the first of this cloud to be generated.
- GeodeList* geodelist = new GeodeList;
- geodelist->push_back(geode);
- cloudMap.insert(CloudMap::value_type(name, geodelist));
+ sprite_height = sprite_width * min_sprite_width / min_sprite_height;
}
- else
- {
- // Add the new cloud to the list of geodes
- (*iter).second->push_back(geode.get());
+
+ if (i == 0) {
+ // The center sprite is always maximum size to fill up any holes.
+ sprite_width = 1.0f + (max_sprite_width - min_sprite_width) / min_sprite_width;
+ sprite_height = 1.0f + (max_sprite_height - min_sprite_height) / min_sprite_height;
}
-
- } else {
-
- int index = sg_random() * num_flavours;
- if (index == num_flavours) index--;
+
+ // Determine the sprite texture indexes.
+ int index_x = (int) floor(sg_random() * num_textures_x);
+ if (index_x == num_textures_x) { index_x--; }
+
+ // The y index depends on the positing of the sprite within the cloud.
+ // This allows cloud designers to have particular sprites for the base
+ // and tops of the cloud.
+ int index_y = (int) floor((z / height + 0.5f) * num_textures_y);
+ if (index_y == num_textures_y) { index_y--; }
- geode = iter->second->at(index);
+ sg->addSprite(SGVec3f(x, y, z),
+ index_x,
+ index_y,
+ sprite_width,
+ sprite_height,
+ bottom_shade,
+ cull_distance_squared,
+ height * 0.5f);
}
+ sg->setGeometry(quad);
+ geode->addDrawable(sg);
+ geode->setName("3D cloud");
+ geode->setEffect(effect.get());
+
return geode;
}
projects / simgear.git / blobdiff