C++ VertexArray类代码示例

Disk::Disk(Graphics::Renderer *r, RefCountedPtr<Material> material, Graphics::RenderState *state, const int edges, const float rad)
	: m_material(material)
{
	PROFILE_SCOPED()
	m_renderState = state;

	VertexArray vertices (ATTRIB_POSITION);

	vertices.Add(vector3f(0.f, 0.f, 0.f));
	const float edgeStep = 360.0f / float(edges);
	for (int i = edges; i >= 0; i--) {
		vertices.Add(vector3f(
			0.f+sinf(DEG2RAD(i*edgeStep))*rad,
			0.f+cosf(DEG2RAD(i*edgeStep))*rad,
			0.f));
	}

	SetupVertexBuffer(vertices, r);
}

void AiCarStandard::AddLinePoint(VertexArray & va, const Vec3 & p)
{
	int vsize;
	const float* vbase;
	va.GetVertices(vbase, vsize);

	if (vsize == 0)
	{
		int vcount = 3;
		float verts[3] = {p[0], p[1], p[2]};
		va.SetVertices(verts, vcount, vsize);
	}
	else
	{
		int vcount = 6;
		float verts[6] = {p[0], p[1], p[2], p[0], p[1], p[2]};
		va.SetVertices(verts, vcount, vsize);
	}
}

Disk::Disk(Graphics::Renderer *r, Graphics::RenderState *state, const Color &c, float rad)
{
	PROFILE_SCOPED()
	m_renderState = state;

	VertexArray vertices (ATTRIB_POSITION);
	m_material.Reset(r->CreateMaterial(MaterialDescriptor()));
	m_material->diffuse = c;

	vertices.Add(vector3f(0.f, 0.f, 0.f));
	for (int i = 72; i >= 0; i--) {
		vertices.Add(vector3f(
			0.f+sinf(DEG2RAD(i*5.f))*rad,
			0.f+cosf(DEG2RAD(i*5.f))*rad,
			0.f));
	}

	SetupVertexBuffer(vertices, r);
}

bool CarGraphics::LoadLight(
	const PTree & cfg,
	ContentManager & content,
	std::ostream & error_output)
{
	float radius;
	std::string radiusstr;
	Vec3 pos(0), col(0);
	if (!cfg.get("position", pos, error_output)) return false;
	if (!cfg.get("color", col, error_output)) return false;
	if (!cfg.get("radius", radius, error_output)) return false;
	cfg.get("radius", radiusstr);

	lights.push_back(Light());

	SceneNode & bodynoderef = topnode.GetNode(bodynode);
	lights.back().node = bodynoderef.AddNode();

	SceneNode & node = bodynoderef.GetNode(lights.back().node);
	node.GetTransform().SetTranslation(Vec3(pos[0], pos[1], pos[2]));

	std::shared_ptr<Model> mesh;
	if (!content.get(mesh, "", "cube" + radiusstr))
	{
		VertexArray varray;
		varray.SetToUnitCube();
		varray.Scale(radius, radius, radius);
		content.load(mesh, "", "cube" + radiusstr, varray);
	}
	models.insert(mesh);

	keyed_container <Drawable> & dlist = node.GetDrawList().lights_omni;
	lights.back().draw = dlist.insert(Drawable());

	Drawable & draw = dlist.get(lights.back().draw);
	draw.SetColor(col[0], col[1], col[2]);
	draw.SetModel(*mesh);
	draw.SetCull(true);
	draw.SetDrawEnable(false);

	return true;
}

VertexArray VertexArray::operator+ (const VertexArray & v) const
{
	VertexArray out;

	COMBINEVECTORS(colors);

	COMBINEVECTORS(normals);

	COMBINEVECTORS(vertices);

	int idxoffset = vertices.size() / 3;
	out.faces.reserve(faces.size() + v.faces.size());
	out.faces.insert(out.faces.end(), faces.begin(), faces.end());
	for (size_t i = 0; i < v.faces.size(); i++)
	{
		out.faces.push_back(v.faces[i]+idxoffset);
	}

	int maxtcsets = GetTexCoordSets();
	if (v.GetTexCoordSets() > maxtcsets)
		maxtcsets = v.GetTexCoordSets();
	int tcsets1 = GetTexCoordSets();
	int tcsets2 = v.GetTexCoordSets();
	out.SetTexCoordSets(maxtcsets);
	for (int i = 0; i < maxtcsets; i++)
	{
		if (i >= tcsets1 && i < tcsets2)
		{
			out.texcoords[i] = v.texcoords[i];
		}
		else if (i < tcsets1 && i >= tcsets2)
		{
			out.texcoords[i] = texcoords[i];
		}
		else if (i < tcsets1 && i < tcsets2)
		{
			COMBINEVECTORS(texcoords[i]);
		}
	}

	return out;
}

VertexArray<float>*
Model::getVArrayPtr(MetaGroup* _grp)
{
	VertexArray<float>* va = new VertexArray<float>(4);
	va->mData = new float[_grp->nVertices*4];
	va->stride = 4*sizeof(float);
	va->size = _grp->nVertices;
	size_t posCount = 0;
	vector<Face*>::const_iterator face_it;
	for (face_it = _grp->fPtrList.begin(); face_it != _grp->fPtrList.end(); ++face_it){
		vector<V3f *>::const_iterator v_it;
		for (v_it=(*face_it)->vertexPtrList.begin(); v_it!=(*face_it)->vertexPtrList.end(); ++v_it){
			va->mData[posCount++] = (*v_it)->getX();
			va->mData[posCount++] = (*v_it)->getY();
			va->mData[posCount++] = (*v_it)->getZ();
			va->mData[posCount++] = mPriCTable.calculateTexCoord(mPriCTable.addColori(_grp->getMat()));
		}
	}
	va->setBB(*_grp->bb);
	return va;
}

void Starfield::Fill(unsigned long seed)
{
	VertexArray *va = m_model->GetSurface(0)->GetVertices();
	va->Clear(); // clear if previously filled
	// Slight colour variation to stars based on seed
	MTRand rand(seed);

	//fill the array
	for (int i=0; i<BG_STAR_MAX; i++) {
		float col = float(rand.Double(0.2,0.7));

		// this is proper random distribution on a sphere's surface
		const float theta = float(rand.Double(0.0, 2.0*M_PI));
		const float u = float(rand.Double(-1.0, 1.0));

		va->Add(vector3f(
				1000.0f * sqrt(1.0f - u*u) * cos(theta),
				1000.0f * u,
				1000.0f * sqrt(1.0f - u*u) * sin(theta)
			), Color(col, col, col,	1.f)
		);
	}
}

void draw(const VertexArray &varray, const IndexArray &iarray) {
    load_xform_matrices();

    bool use_vbo = !varray.get_dynamic() && sys_caps.vertex_buffers;
    bool use_ibo = false;//!iarray.get_dynamic() && sys_caps.vertex_buffers;

    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_COLOR_ARRAY);
    glEnableClientState(GL_NORMAL_ARRAY);

    if(use_vbo) {
        Vertex v;
        glBindBuffer(GL_ARRAY_BUFFER_ARB, varray.get_buffer_object());
        glVertexPointer(3, GL_SCALAR_TYPE, sizeof(Vertex), (void*)((char*)&v.pos - (char*)&v));
        glNormalPointer(GL_SCALAR_TYPE, sizeof(Vertex), (void*)((char*)&v.normal - (char*)&v));
        glColorPointer(4, GL_SCALAR_TYPE, sizeof(Vertex), (void*)((char*)&v.color - (char*)&v));

        for(int i=0; i<MAX_TEXTURES; i++) {
            select_texture_unit(i);
            glEnableClientState(GL_TEXTURE_COORD_ARRAY);

            int dim = ttype[i] == TEX_1D ? 1 : (ttype[i] == TEX_3D || ttype[i] == TEX_CUBE ? 3 : 2);
            glTexCoordPointer(dim, GL_SCALAR_TYPE, sizeof(Vertex), (void*)((char*)&v.tex[coord_index[i]] - (char*)&v));
        }

        glBindBuffer(GL_ARRAY_BUFFER_ARB, 0);
    } else {
        glVertexPointer(3, GL_SCALAR_TYPE, sizeof(Vertex), &varray.get_data()->pos);
        glNormalPointer(GL_SCALAR_TYPE, sizeof(Vertex), &varray.get_data()->normal);
        glColorPointer(4, GL_SCALAR_TYPE, sizeof(Vertex), &varray.get_data()->color);

        for(int i=0; i<MAX_TEXTURES; i++) {
            select_texture_unit(i);
            glEnableClientState(GL_TEXTURE_COORD_ARRAY);

            int dim = ttype[i] == TEX_1D ? 1 : (ttype[i] == TEX_3D || ttype[i] == TEX_CUBE ? 3 : 2);
            glTexCoordPointer(dim, GL_SCALAR_TYPE, sizeof(Vertex), &varray.get_data()->tex[coord_index[i]]);
        }
    }

    if(use_ibo) {
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER_ARB, iarray.get_buffer_object());
        glDrawElements(primitive_type, iarray.get_count(), GL_UNSIGNED_INT, 0);
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER_ARB, 0);
    } else {
        glDrawElements(primitive_type, iarray.get_count(), GL_UNSIGNED_INT, iarray.get_data());
    }

    glDisableClientState(GL_VERTEX_ARRAY);
    glDisableClientState(GL_COLOR_ARRAY);
    glDisableClientState(GL_NORMAL_ARRAY);

    for(int i=0; i<MAX_TEXTURES; i++) {
        select_texture_unit(i);
        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
    }
}

void drawVertArray(GLenum shape,const VertexArray& varr) {
    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_COLOR_ARRAY);
    glEnableClientState(GL_NORMAL_ARRAY);

    glVertexPointer(3,GL_FLOAT,sizeof(Vertex),&varr[0].loc[0]);
    glColorPointer(3,GL_FLOAT,sizeof(Vertex),&varr[0].color[0]);
    glNormalPointer(GL_FLOAT,sizeof(Vertex),&varr[0].normal[0]);

    glDrawArrays(shape,0,varr.size());

    glDisableClientState(GL_VERTEX_ARRAY);
    glDisableClientState(GL_COLOR_ARRAY);
    glDisableClientState(GL_NORMAL_ARRAY);
}

	Particle(const VertexShader& vs, FragmentShader&& frag)
	 : sphere_instr(make_sphere.Instructions())
	 , sphere_indices(make_sphere.Indices())
	 , fs(std::forward<FragmentShader>(frag))
	{
		// attach the shaders to the program
		prog.AttachShader(vs);
		prog.AttachShader(fs);
		// link and use it
		prog.Link();
		prog.Use();

		projection_matrix = (prog/"ProjectionMatrix");
		camera_matrix = (prog/"CameraMatrix");
		model_matrix = (prog/"ModelMatrix");
		light_pos = (prog/"LightPos");

		// bind the VAO for the sphere
		sphere.Bind();

		const GLuint n_attr = 2;
		// pointers to the vertex attribute data build functions
		typedef GLuint (shapes::Sphere::*Func)(std::vector<GLfloat>&) const;
		Func func[n_attr] = {
			&shapes::Sphere::Positions,
			&shapes::Sphere::Normals,
		};
		// managed references to the VBOs
		Reference<Buffer> vbo[n_attr] = {verts, normals};
		// vertex attribute identifiers from the shaders
		const GLchar* ident[n_attr] = {"Position", "Normal"};

		for(GLuint i=0; i!=n_attr; ++i)
		{
			// bind the VBO
			vbo[i].Bind(Buffer::Target::Array);
			// make the data
			std::vector<GLfloat> data;
			GLuint n_per_vertex = (make_sphere.*func[i])(data);
			// upload the data
			Buffer::Data(Buffer::Target::Array, data);
			// setup the vertex attrib
			VertexArrayAttrib attr(prog, ident[i]);
			attr.Setup<GLfloat>(n_per_vertex);
			attr.Enable();
		}
	}

void QuadPrimitive::setVertices(const VertexArray& arr)
{
	osg::Vec3 vec = { 0.0f, 0.0f, 0.0f };
	int i = 0;
	for ( i = 0; i < arr.size(); i++)
	{
		(*m_vertexArray)[i].set(arr[i].getX(),arr[i].getY(),arr[i].getZ());
		vec += {arr[i].getX(), arr[i].getY(), arr[i].getZ()};
	}
	m_center = vec / 4.0;
	m_height = ((*m_vertexArray)[1] - (*m_vertexArray)[0]).length();
	m_width = ((*m_vertexArray)[2] - (*m_vertexArray)[1]).length();

	m_vertexArray->dirty();
	_geometry->dirtyBound();
	_outLine->dirtyBound();
}

	void Render(const Mat4f& model)
	{
		prog.Use();
		model_matrix.Set(model);
		// bind the VAO
		sphere.Bind();
		// use the instructions to draw the sphere
		// (this basically calls glDrawArrays* or glDrawElements*)
		sphere_instr.Draw(sphere_indices);
	}

    Shape(const Program& prog)
      : vbos(4)
      , point_count(4096) {
        // bind the VAO for the shape
        vao.Bind();

        make_shape_1(prog, 0, "Position1");
        make_shape_2(prog, 1, "Position2");
        make_radiance(prog, 2, "Radiance1");
        make_radiance(prog, 3, "Radiance2");
    }

void Game::render() {
    glClearColor( 0.1, 0.1, 0.1, 1.0 );
    glClear( GL_COLOR_BUFFER_BIT );

    RenderStates defRenderStates;

    temp.resize( 4 );
    temp.setPrimitiveType( PrimitiveType::PType_Quads );
    temp[ 0 ].pos = Vec2f( 0, 0 );
    temp[ 1 ].pos = Vec2f( 1, 0 );
    temp[ 2 ].pos = Vec2f( 1, 1 );
    temp[ 3 ].pos = Vec2f( 0, 1 );

    m_renderer.draw( temp, defRenderStates );

    if( m_gameState ) {
        m_gameState->render( m_renderer, defRenderStates );
    }

    SDL_GL_SwapWindow( m_window );
}

	void Render(double time)
	{
		gl.Clear().ColorBuffer().DepthBuffer();

		auto camera = CamMatrixf::Orbiting(
			Vec3f(),
			8.5,
			FullCircles(time / 5.0),
			Degrees(15 + (-SineWave(time/10.0)+1.0)* 0.5 * 75)
		);
		ModelMatrixf model =
			ModelMatrixf::Translation(0.0f, 2.5f, 0.0) *
			ModelMatrixf::RotationA(
				Vec3f(1.0f, 1.0f, 1.0f),
				FullCircles(time / 7.0)
			);

		plane_prog.Use();
		plane_camera_matrix.Set(camera);

		plane.Bind();
		gl.DrawArrays(PrimitiveType::TriangleStrip, 0, 4);

		shape_prog.Use();
		shape_camera_matrix.Set(camera);

		shape_model_matrix.Set(model);
		shape.Bind();
		shape_instr.Draw(shape_indices);

		halo_prog.Use();
		halo_camera_matrix.Set(camera);
		halo_model_matrix.Set(model);

		gl.DepthMask(false);
		gl.Enable(Capability::Blend);
		shape_instr.Draw(shape_indices);
		gl.Disable(Capability::Blend);
		gl.DepthMask(true);
	}