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/* ----------------------------------------------------------------------- *

 * This file is part of GEL, http://www.imm.dtu.dk/GEL

 * Copyright (C) the authors and DTU Informatics

 * For license and list of authors, see ../../doc/intro.pdf

 * ----------------------------------------------------------------------- */

#include "ManifoldRenderer.h"

#include <GLUT/GLUT.h>

#include <algorithm>

#include <string>

#include <cstdlib>

#include "../Geometry/TriMesh.h"

#include "../CGLA/Mat3x3d.h"

#include "../GLGraphics/glsl_shader.h"

#include "../GLGraphics/draw.h"

#include "../HMesh/Manifold.h"

#include "../HMesh/AttributeVector.h"

#include "../HMesh/curvature.h"

using namespace CGLA;

using namespace HMesh;

using namespace std;

using namespace Geometry;

namespace GLGraphics

{

    void draw_ball() {

        static TriMesh mesh;

        if(mesh.geometry.no_vertices()==0)

        {

            GLfloat sphere_verts[] = {0.91358,0,0,-0.91358,0,0,0,0.91358,0,0,-0.91358,0,0,0,0.91358,0,0,-0.91358,0.54321,-0.54321,0.54321,0.54321,0.54321,-0.54321,-0.54321,0.54321,0.54321,-0.54321,-0.54321,-0.54321,0.54321,0.54321,0.54321,-0.54321,0.54321,-0.54321,-0.54321,-0.54321,0.54321,0.54321,-0.54321,-0.54321,0.444444,0,0.814815,0,-0.814815,0.444444,0.814815,-0.444444,0,0.444444,0,-0.814815,0,0.814815,-0.444444,0.814815,0.444444,0,-0.444444,0,0.814815,0,0.814815,0.444444,-0.814815,0.444444,0,-0.444444,0,-0.814815,0,-0.814815,-0.444444,-0.814815,-0.444444,0,0,0.444444,0.814815,0.814815,0,0.444444,0.444444,0.814815,0,0,0.444444,-0.814815,-0.814815,0,-0.444444,-0.444444,0.814815,0,0,-0.444444,0.814815,-0.814815,0,0.444444,-0.444444,-0.814815,0,0,-0.444444,-0.814815,0.814815,0,-0.444444,0.444444,-0.814815,0};

            GLuint sphere_indices[] = {28,11,15,27,5,15,33,7,15,33,13,16,35,4,16,38,7,16,38,14,17,37,1,17,28,7,17,37,14,18,36,6,18,30,8,18,30,12,19,32,3,19,29,8,19,29,11,20,28,1,20,37,8,20,34,13,21,33,5,21,27,9,21,27,11,22,29,3,22,32,9,22,32,12,23,31,2,23,34,9,23,31,12,24,30,6,24,36,10,24,36,14,25,38,4,25,35,10,25,35,13,26,34,2,26,31,10,26,22,9,27,21,5,27,15,11,27,15,7,28,17,1,28,20,11,28,20,8,29,19,3,29,22,11,29,19,8,30,18,6,30,24,12,30,24,10,31,26,2,31,23,12,31,23,9,32,22,3,32,19,12,32,16,7,33,15,5,33,21,13,33,21,9,34,23,2,34,26,13,34,26,10,35,25,4,35,16,13,35,25,10,36,24,6,36,18,14,36,18,8,37,20,1,37,17,14,37,17,7,38,16,4,38,25,14,38};

            for(int i=0;i<38;++i) {

                int idx0 = 3*i;

                mesh.geometry.add_vertex(Vec3f(sphere_verts[idx0],sphere_verts[idx0+1],sphere_verts[idx0+2]));

            }

            for(int i=0;i<72;++i) {

                int idx0 = 3*i;

                mesh.geometry.add_face(Vec3i(sphere_indices[idx0]-1,sphere_indices[idx0+1]-1,sphere_indices[idx0+2]-1));

            }

            mesh.compute_normals();

        }

        draw(mesh);

    }

    GLuint get_noise_texture_id()

    {

        static GLuint texname=0;

        static bool was_here = false;

        if(!was_here)

        {

            was_here = true;

            int width = 32;

            int height = 32;

            int depth = 32;

            vector<unsigned char> texels(width*height*depth);

            for (int i = 0; i < width*height*depth; ++i)

            {

                int intensity = 255.0 * (float(gel_rand()) / GEL_RAND_MAX);

                texels[i] = (unsigned char) intensity;

            }

            glGenTextures(1, &texname);	

            glBindTexture(GL_TEXTURE_3D, texname);

            glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

            glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

            glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_REPEAT);

            glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_REPEAT);

            glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_REPEAT);

            glTexImage3D(GL_TEXTURE_3D, 0, GL_INTENSITY8, width, height, depth, 0, GL_RED, GL_UNSIGNED_BYTE, &texels[0]);

        }

        return texname;

    }

    int WireframeRenderer::maximum_face_valency(const Manifold& m)

    {

        int max_val = 0;

        for(FaceIDIterator f = m.faces_begin(); f != m.faces_end(); ++f)

            max_val = max(max_val, no_edges(m, *f));

        return max_val;

    }

    WireframeRenderer::WireframeRenderer(HMesh::Manifold& m, bool smooth): idbuff_renderer(0)

    {

        if(GLEW_EXT_geometry_shader4 && maximum_face_valency(m) > 3)

        {

            GLint viewp[4];

            glGetIntegerv(GL_VIEWPORT,viewp);

            idbuff_renderer = new IDBufferWireframeRenderer(viewp[2], viewp[3], m);

        }

        else

        {

            glNewList(display_list,GL_COMPILE);

            if(GLEW_EXT_geometry_shader4)

                draw_triangles_in_wireframe(m,smooth, Vec3f(1,0,0));				

            else

                draw_wireframe_oldfashioned(m,smooth, Vec3f(1,0,0));

            glEndList();

        }

    }

    void WireframeRenderer::draw()

    {

        if(idbuff_renderer)

        {

            glEnable(GL_LIGHTING);

            idbuff_renderer->draw(Vec3f(1,0,0),Vec3f(1));

            glDisable(GL_LIGHTING);

        }

        else

            glCallList(display_list);

    }

    void SimpleShaderRenderer::init_shaders(const std::string& vss, 

                                            const std::string& fss)

    {

        vs = create_glsl_shader(GL_VERTEX_SHADER, vss);

        print_glsl_program_log(vs);

        fs = create_glsl_shader(GL_FRAGMENT_SHADER, fss);

        print_glsl_program_log(fs);

        prog = glCreateProgram();

        if(vs) glAttachShader(prog, vs);

        if(fs) glAttachShader(prog, fs);

        glLinkProgram(prog);

        print_glsl_program_log(prog);

    }

    void SimpleShaderRenderer::compile_display_list(const Manifold& m, bool smooth)

    {

        GLint old_prog;

        glGetIntegerv(GL_CURRENT_PROGRAM, &old_prog);

        glUseProgram(prog);

        glNewList(display_list,GL_COMPILE);

        GLGraphics::draw(m, smooth);

        glEndList();	

        glUseProgram(old_prog);

    }

    void SimpleShaderRenderer::draw()

    {

        GLint old_prog;

        glGetIntegerv(GL_CURRENT_PROGRAM, &old_prog);

        glUseProgram(prog);

        glCallList(display_list);

        glUseProgram(old_prog);

    }

    const string NormalRenderer::vss =

    "varying vec3 _n;\n"

    "varying vec3 v;\n"

    "\n"

    "void main(void)\n"

    "{\n"

    "	gl_Position = ftransform();\n"

    "	v = vec3(gl_ModelViewMatrix * gl_Vertex);\n"

    "	_n = normalize(gl_NormalMatrix * gl_Normal);\n"

    "}\n";

    const string NormalRenderer::fss =

    "varying vec3 _n;\n"

    "varying vec3 v;\n"

    "\n"

    "void main(void)\n"

    "{\n"

    "   vec3 n = normalize(_n);\n"

    "	vec3 l = normalize(-v);\n"

    "	vec3 e = l;\n"

    "	vec3 r = normalize(2.0*dot(l, n)*n - l);\n"

    "	\n"

    "	vec4 a = vec4(0.0,0.1,.3,1.0);\n"

    "   float dot_ln = abs(dot(l, n));\n"

    "	vec4 d = vec4(0.7) * dot_ln;\n"

    "	vec4 s = vec4(0.3)*smoothstep(0.98,0.9999,dot(r, e));\n"

    "	\n"

    "	gl_FragColor =  d+s;\n"

    "}\n";

    const string DebugRenderer::vss =

    "varying vec3 _n;\n"

    "varying vec3 v;\n"

    "varying vec3 c;\n"

    "\n"

    "void main(void)\n"

    "{\n"

    "	gl_Position = ftransform();\n"

    "	v = vec3(gl_ModelViewMatrix * gl_Vertex);\n"

    "	_n = normalize(gl_NormalMatrix * gl_Normal);\n"

    "   c = gl_Color.rgb;\n"

    "}\n";

    const string DebugRenderer::fss =

    "varying vec3 _n;\n"

    "varying vec3 v;\n"

    "varying vec3 c;\n"

    "\n"

    "void main(void)\n"

    "{\n"

    "   vec3 n = normalize(_n);\n"

    "	vec3 l = normalize(-v);\n"

    "	vec3 e = l;\n"

    "	vec3 r = normalize(2.0*dot(l, n)*n - l);\n"

    "	\n"

    "	vec4 a = vec4(0.0,0.1,.3,1.0);\n"

    "   float dot_ln = abs(dot(l, n));\n"

    "	vec4 d = vec4(c,1) * 0.7 * dot_ln;\n"

    "	vec4 s = vec4(c,1) * 0.3 * smoothstep(0.98,0.9999,dot(r, e));\n"

    "	\n"

    "	gl_FragColor =  d+s;\n"

    "}\n";

    HMesh::VertexAttributeVector<CGLA::Vec3f> DebugRenderer::vertex_colors;

    HMesh::HalfEdgeAttributeVector<CGLA::Vec3f> DebugRenderer::edge_colors;

    HMesh::FaceAttributeVector<CGLA::Vec3f> DebugRenderer::face_colors;

    void DebugRenderer::compile_display_list(const HMesh::Manifold& m, bool smooth)

    {

        GLint old_prog;

        glGetIntegerv(GL_CURRENT_PROGRAM, &old_prog);

        glUseProgram(prog);

        glNewList(display_list,GL_COMPILE);

        glEnable(GL_POLYGON_OFFSET_FILL);

        glPolygonOffset(1,1);

        for(FaceID f: m.faces()){

            Vec3f c = face_colors[f];

            glColor3f(c[0], c[1], c[2]);

            if(!smooth)

                glNormal3dv(normal(m, f).get());

            if(no_edges(m, f)== 3)

                glBegin(GL_TRIANGLES);

            else

                glBegin(GL_POLYGON);

            for(Walker w = m.walker(f); !w.full_circle(); w = w.circulate_face_ccw()){

                Vec3d n = normal(m, w.vertex());

                if(smooth)

                    glNormal3dv(n.get());

                glVertex3dv(m.pos(w.vertex()).get());

            }

            glEnd();

        }

        glLineWidth(2);

        glDisable(GL_POLYGON_OFFSET_FILL);

        glBegin(GL_LINES);

        for(auto hid: m.halfedges())

        {

            Walker w = m.walker(hid);

            Vec3f c = edge_colors[hid];

            glColor3fv(c.get());

            glNormal3dv(normal(m, w.opp().vertex()).get());

            glVertex3dv(m.pos(w.opp().vertex()).get());

            glNormal3dv(normal(m, w.vertex()).get());

            glVertex3dv(m.pos(w.vertex()).get());

        }

        glEnd();

        glLineWidth(1);

        Vec3d c;

        float r;

        bsphere(m, c, r);

        r *= 0.003;

        for(auto vid : m.vertices())

        {

            Vec3d p = m.pos(vid);

            Vec3f c = vertex_colors[vid];

            glColor3f(c[0], c[1], c[2]);

            glPushMatrix();

            glTranslated(p[0], p[1], p[2]);

            glScalef(r, r, r);

            draw_ball();

            glPopMatrix();

        }

        glEnd();

        glEndList();

        glUseProgram(old_prog);

    }

    const string ReflectionLineRenderer::vss = 

    "varying vec3 _n;\n"

    "varying vec3 v;\n"

    "\n"

    "void main(void)\n"

    "{\n"

    "	gl_Position = ftransform();\n"

    "	v = vec3(gl_ModelViewMatrix * gl_Vertex);\n"

    "	_n = normalize(gl_NormalMatrix * gl_Normal);\n"

    "}\n";

    const string ReflectionLineRenderer::fss = 

    "uniform float detail;\n"

    "\n"

    "varying vec3 _n;\n"

    "varying vec3 v;\n"

    "\n"

    "void main(void)\n"

    "{\n"

    "   vec3 n = normalize(_n);\n"

    "	// calculate the reflection\n"

    "	vec3 r = normalize(2.0*dot(-v, n)*n + v);\n"

    "	vec3 viewer_lightdir = vec3(0, 0, 1.0);\n"

    "   float diff  = dot(n,viewer_lightdir);\n"

    "	\n"

    "	vec2 r2 = normalize(vec2(r[0], r[2]));\n"

    "	vec2 x = vec2(1, 0);\n"

    "	float angle = acos(dot(r2, x));\n"

    "	\n"

    "	// decide if we hit a white or black ring, based on y value\n"

    "	gl_FragColor = diff * vec4(1.0) + smoothstep(0.8, 1.0,cos(13.0*angle)) * vec4(-1.0);\n"

    "}\n";

    const string IsophoteLineRenderer::vss = 

    "varying vec3 _n;\n"

    "varying vec3 v;\n"

    "\n"

    "void main(void)\n"

    "{\n"

    "	gl_Position = ftransform();\n"

    "	v = vec3(gl_ModelViewMatrix * gl_Vertex);\n"

    "	_n = normalize(gl_NormalMatrix * gl_Normal);\n"

    "}\n";

    const string IsophoteLineRenderer::fss = 

    "uniform float detail;\n"

    "\n"

    "varying vec3 _n;\n"

    "varying vec3 v;\n"

    "\n"

    "void main(void)\n"

    "{\n"

    "   vec3 n = normalize(_n);\n"

    "	vec3 viewer_lightdir = vec3(0, 0, 1.0);\n"

    "	vec3 isophote_lightdir = viewer_lightdir;\n"

    "	float angle = acos(dot(n, isophote_lightdir));\n"

    "   float diff  = dot(n,viewer_lightdir);\n"

    "	\n"

    "	// decide if we hit a white or black ring, based on y value\n"

    "	gl_FragColor = diff * vec4(1.0) + smoothstep(0.8, 1.0,cos(20.0*angle)) * vec4(-1.0);\n"

    "}\n";

    const string ToonRenderer::vss = 

    "varying vec3 _n;\n"

    "varying vec3 v;\n"

    "\n"

    "void main(void)\n"

    "{\n"

    "	gl_Position = ftransform();\n"

    "	v = vec3(gl_ModelViewMatrix * gl_Vertex);\n"

    "	_n = normalize(gl_NormalMatrix * gl_Normal);\n"

    "}\n";

    const string ToonRenderer::fss = 

    "varying vec3 _n;\n"

    "varying vec3 v;\n"

    "\n"

    "void main(void)\n"

    "{\n"

    "   vec3 n = normalize(_n);\n"

    "	vec3 l = normalize(-v);\n"

    "	vec3 e = l;\n"

    "	vec3 r = normalize(2.0*dot(l, n)*n - l);\n"

    "	\n"

    "	vec4 a = vec4(0.0,0.1,.3,1.0);\n"

    "   float dot_ln = abs(dot(l, n));\n"

    "	vec4 d = vec4(0.7,0.7,0.0,1.0) * 0.25 * (smoothstep(0.23,0.25,dot_ln)+smoothstep(0.45,0.47,dot_ln)+smoothstep(0.7,0.72,dot_ln)+smoothstep(0.9,0.92,dot_ln));\n"

    "	vec4 s = vec4(0.5,0.3,0.4,1.0)*smoothstep(0.96,0.98,dot(r, e));\n"

    "	\n"

    "	gl_FragColor =  d+s;\n"

    "}\n";

    void GlazedRenderer::compile_display_list(const HMesh::Manifold& m, bool smooth)

    {

        GLint old_prog;

        glGetIntegerv(GL_CURRENT_PROGRAM, &old_prog);

        glUseProgram(prog);

        glNewList(display_list,GL_COMPILE);

        glBindTexture(GL_TEXTURE_3D, get_noise_texture_id());

        glUniform1iARB(glGetUniformLocationARB(prog, "noise_tex"),0);

        float r;

        Vec3d c;

        bsphere(m, c, r);

        glUniform1fARB(glGetUniformLocationARB(prog, "noise_scale"),12.0/r);

        GLGraphics::draw(m, smooth);

        glEndList();

        glUseProgram(old_prog);

    }

    const string GlazedRenderer::vss = 

    "varying vec3 _n;\n"

    "varying vec3 v;\n"

    "varying vec3 v_obj;\n"

    "\n"

    "void main(void)\n"

    "{\n"

    "	gl_Position = ftransform();\n"

    "   v_obj = gl_Vertex.xyz;\n"

    "	v = vec3(gl_ModelViewMatrix * gl_Vertex);\n"

    "	_n = normalize(gl_NormalMatrix * gl_Normal);\n"

    "}\n"

    "\n";

    const string GlazedRenderer::fss =

    "uniform sampler3D noise_tex;\n"

    "uniform float noise_scale;\n"

    "varying vec3 _n;\n"

    "varying vec3 v;\n"

    "varying vec3 v_obj;\n"

    "\n"

    "vec4 glazed_shader(vec4 mat_col,  vec4 light_col, vec3 light_dir)\n"

    "{\n"

    "   vec3 n = normalize(_n);\n"

    "	vec3 e = normalize(-v);\n"

    "	vec3 r = normalize(2.0*dot(e, n)*n - e);\n"

    "	float d = max(0.05,dot(light_dir, n));\n"

    "	vec4 diff = mat_col * light_col *d; 	\n"

    "	vec4 refl = smoothstep(0.7,0.75,dot(r,light_dir)) * light_col;\n"

    "	return 0.15*refl + diff;\n"

    "}\n"

    "\n"

    "void main(void)\n"

    "{\n"

    "	vec4 mat_col = vec4(0.9,1.0,0.4,1.0) +  vec4(-0.1,-0.1,0.12,0.0) * texture3D(noise_tex, noise_scale*v_obj).x\n"

    " + vec4(0.05) * texture3D(noise_tex, 500.0*v_obj).x;\n"

    "	\n"

    "	vec3 light0_dir = vec3(0.0,1.0,0.0);\n"

    "	vec4 light0_col = vec4(0.7,0.9,1.0,1.0);\n"

    "	\n"

    "	vec3 light1_dir = vec3(0.0,0.0,1.0);\n"

    "	vec4 light1_col = vec4(1.0,1.0,0.7,1.0);\n"

    "	\n"

    "	gl_FragColor = \n"

    "	0.5*glazed_shader(mat_col, light0_col, light0_dir)+\n"

    "	0.5*glazed_shader(mat_col, light1_col, light1_dir);\n"

    "	\n"

    "	gl_FragColor.a = 1.0;\n"

    "}\n";

    const string ScalarFieldRenderer::vss =

    "	attribute float scalar;\n"

    "	varying vec3 _normal;\n"

    "	varying float s;\n"

    "	\n"

    "	void main(void)\n"

    "	{\n"

    "		gl_Position =  ftransform();\n"

    "		_normal = normalize(gl_NormalMatrix * gl_Normal);\n"

    "		s=scalar;\n"

    "	}\n";

    const string ScalarFieldRenderer::fss = 	

    "	varying vec3 _normal;\n"

    "	varying float s;\n"

    "	uniform float scalar_max;\n"

    "   uniform float gamma;\n"

    "	const vec3 light_dir = vec3(0,0,1);\n"

    "	\n"

    "	void main()\n"

    "	{\n"

    "       vec3 normal = normalize(_normal);\n"

    "		float dot_ln = max(0.0,dot(light_dir, normal));\n"

    "		\n"

    "		float s_norm = s/scalar_max;\n"

    "		float stripe_signal = 10.0 * s_norm;\n"

    "		vec4 stripe_col = abs(stripe_signal) < 3.14 ? vec4(-1.0,0,0,0) : vec4(.9,.9,.9,0);\n"

    "		\n"

    "		gl_FragColor = s_norm * vec4(-1,0,1,0);\n"

    "       gl_FragColor *= dot_ln;\n"

    "       gl_FragColor.r = pow(gl_FragColor.r, 1.0/gamma);\n"

    "       gl_FragColor.g = pow(gl_FragColor.g, 1.0/gamma);\n"

    "       gl_FragColor.b = pow(gl_FragColor.b, 1.0/gamma);\n"

    "		//gl_FragColor += stripe_col * smoothstep(0.8,1.0,cos(stripe_signal));\n"

    "	}\n";

    void ScalarFieldRenderer::compile_display_list(const HMesh::Manifold& m, bool smooth,

                                                   HMesh::VertexAttributeVector<double>& field, double max_val, float gamma)

    {

        GLint old_prog;

        glGetIntegerv(GL_CURRENT_PROGRAM, &old_prog);

        glUseProgram(prog);

        GLuint scalar_attrib = glGetAttribLocation(prog, "scalar");

        glUniform1fARB(glGetUniformLocationARB(prog, "scalar_max"), max_val);

        //    static float& gamma = CreateCVar("display.scalar_field_renderer.gamma",2.2f);

        glUniform1fARB(glGetUniformLocationARB(prog, "gamma"), gamma);

        glNewList(display_list,GL_COMPILE);

        for(FaceIDIterator f = m.faces_begin(); f != m.faces_end(); ++f){      

            if(!smooth) 

                glNormal3dv(normal(m, *f).get());

            if(no_edges(m, *f)== 3) 

                glBegin(GL_TRIANGLES);

            else 

                glBegin(GL_POLYGON);

            for(Walker w = m.walker(*f); !w.full_circle(); w = w.circulate_face_ccw()){

                Vec3d n(normal(m, w.vertex()));

                if(smooth) 

                    glNormal3dv(n.get());

                glVertexAttrib1d(scalar_attrib, field[w.vertex()]);

                glVertex3dv(m.pos(w.vertex()).get());

            }

            glEnd();

        }

        glEndList();	

        glUseProgram(old_prog);

    }

    const string AmbientOcclusionRenderer::vss =

    "	attribute float scalar;\n"

    "	varying vec3 _normal;\n"

    "	varying float s;\n"

    "	\n"

    "	void main(void)\n"

    "	{\n"

    "		gl_Position =  ftransform();\n"

    "		_normal = normalize(gl_NormalMatrix * gl_Normal);\n"

    "		s=scalar;\n"

    "	}\n";

    const string AmbientOcclusionRenderer::fss = 	

    "	varying vec3 _normal;\n"

    "	varying float s;\n"

    "	uniform float scalar_max;\n"

    "	const vec3 light_dir = vec3(0,0,1);\n"

    "	\n"

    "	void main()\n"

    "	{\n"

    "   vec3 normal = normalize(_normal);\n"

    "		float dot_ln = max(0.0,dot(light_dir, normal));\n"

    "		\n"

    "		float s_norm = min(1.0,s/scalar_max+1.0);\n"

    "		\n"

    "		gl_FragColor = s_norm * vec4(1.0);\n"

    "       gl_FragColor *= dot_ln;\n"

    "       gl_FragColor.r = pow(gl_FragColor.r, 1.0);\n"

    "       gl_FragColor.g = pow(gl_FragColor.g, 1.0);\n"

    "       gl_FragColor.b = pow(gl_FragColor.b, 1.0);\n"

    "	}\n";

    void AmbientOcclusionRenderer::compile_display_list(const HMesh::Manifold& m, HMesh::VertexAttributeVector<double>& field, double max_val)

    {	

        GLint old_prog;

        glGetIntegerv(GL_CURRENT_PROGRAM, &old_prog);

        glUseProgram(prog);

        GLuint scalar_attrib = glGetAttribLocation(prog, "scalar");

        glUniform1fARB(glGetUniformLocationARB(prog, "scalar_max"), max_val);

        glNewList(display_list,GL_COMPILE);

        for(FaceIDIterator f = m.faces_begin(); f != m.faces_end(); ++f){

            if(no_edges(m, *f)== 3)

                glBegin(GL_TRIANGLES);

            else 

                glBegin(GL_POLYGON);

            for(Walker w = m.walker(*f); !w.full_circle(); w = w.circulate_face_ccw())

            {

                Vec3d n(normal(m, w.vertex()));

                glNormal3dv(n.get());

                glVertexAttrib1d(scalar_attrib, field[w.vertex()]);

                glVertex3dv(m.pos(w.vertex()).get());

            }

            glEnd();

        }

        glEndList();	

        glUseProgram(old_prog);

    }

    void LineFieldRenderer::compile_display_list(const HMesh::Manifold& m,HMesh::VertexAttributeVector<CGLA::Vec3d>& lines)

    {

        float r;

        Vec3d c;

        bsphere(m, c, r);

        float noise_scale = 10.0f/r;

        float line_scale = 0.02f;

        GLint old_prog;

        glGetIntegerv(GL_CURRENT_PROGRAM, &old_prog);

        glUseProgram(prog);

        glNewList(display_list,GL_COMPILE);

        glUniform1fARB(glGetUniformLocationARB(prog, "line_scale"),line_scale);

        glUniform1fARB(glGetUniformLocationARB(prog, "noise_scale"),noise_scale);

        glUniform1iARB(glGetUniformLocationARB(prog, "noise_tex"),0);

        GLuint direction = glGetAttribLocation(prog, "direction");	

        glBindTexture(GL_TEXTURE_3D, get_noise_texture_id());

        for(FaceIDIterator f = m.faces_begin(); f != m.faces_end(); ++f){

            if(no_edges(m, *f) == 3)

                glBegin(GL_TRIANGLES);

            else 

                glBegin(GL_POLYGON);

            Vec3d n(normal(m, *f));

            Vec3d d0 = lines[m.walker(*f).vertex()];

            d0 = normalize(d0-n*dot(n,d0));

            for(Walker w = m.walker(*f); !w.full_circle(); w = w.circulate_face_ccw()){

                Vec3d n(normal(m, w.vertex()));

                glNormal3dv(n.get());

                Vec3d d = lines[w.vertex()];

                d = normalize(d-n*dot(n,d));

                if(dot(d,d0)<0) d=-d;

                glVertexAttrib3dv(direction, d.get());

                glVertex3dv(m.pos(w.vertex()).get());

            }

            glEnd();

        }

        glBindTexture(GL_TEXTURE_3D, 0);

        glEndList();	

        glUseProgram(old_prog);

    }

    const string LineFieldRenderer::vss = 

    "attribute vec3 direction;\n"

    "varying vec3 _n;\n"

    "varying vec3 dir_obj;\n"

    "varying vec3 v_obj;\n"

    "\n"

    "void main(void)\n"

    "{\n"

    "	gl_Position = ftransform();\n"

    "   v_obj = gl_Vertex.xyz;\n"

    "	dir_obj = direction;\n"

    "	_n = normalize(gl_NormalMatrix * gl_Normal);\n"

    "}\n";

    const string LineFieldRenderer::fss =

    "uniform sampler3D noise_tex;\n"

    "uniform float line_scale;\n"

    "uniform float noise_scale;\n"

    "varying vec3 _n;\n"

    "varying vec3 dir_obj;\n"

    "varying vec3 v_obj;\n"

    "\n"

    "float tex(vec3 p) {return smoothstep(0.2,0.4,texture3D(noise_tex, p).x);}\n"

    "void main(void)\n"

    "{\n"

    "   vec3 n = normalize(_n);\n"

    "   vec3 d = normalize(dir_obj);\n"

    "   float I = "

    "             tex(noise_scale*v_obj + 6.0*line_scale*d) + \n"

    "             tex(noise_scale*v_obj - 6.0*line_scale*d) + \n"

    "             tex(noise_scale*v_obj + 5.0*line_scale*d) + \n"

    "             tex(noise_scale*v_obj - 5.0*line_scale*d) + \n"

    "             tex(noise_scale*v_obj + 4.0*line_scale*d) + \n"

    "             tex(noise_scale*v_obj - 4.0*line_scale*d) + \n"

    "             tex(noise_scale*v_obj + 3.0*line_scale*d) + \n"

    "             tex(noise_scale*v_obj - 3.0*line_scale*d) + \n"

    "             tex(noise_scale*v_obj + 2.0*line_scale*d) + \n"

    "             tex(noise_scale*v_obj - 2.0*line_scale*d) + \n"

    "             tex(noise_scale*v_obj + 1.0*line_scale*d) + \n"

    "             tex(noise_scale*v_obj - 1.0*line_scale*d) + \n"

    "			  tex(noise_scale*v_obj); \n"

    "	\n"

    "   float diff = max(0.0,dot(n,vec3(0.0, 0.0, 1.0)));\n"

    "	gl_FragColor.rgb = vec3(diff*I/13.0);\n"

    "	gl_FragColor.a = 1.0;\n"

    "}\n";

    GLuint HarmonicsRenderer::prog_P0 = 0;

    GLGraphics::Console::variable<float> HarmonicsRenderer::display_harmonics_time;

    GLGraphics::Console::variable<int> HarmonicsRenderer::display_harmonics_diffuse;

    GLGraphics::Console::variable<int> HarmonicsRenderer::display_harmonics_highlight;

    string vss =

	"#version 120\n"

	"#extension GL_EXT_gpu_shader4 : enable\n"

	"	\n"

	"	\n"

	"	attribute float eigenvalue;\n"

	"	attribute float eigenvalue2;\n"

	"	varying vec3 normal;\n"

	"	varying float eig;\n"

	"	varying float eig2;\n"

	"	\n"

	"	void main(void)\n"

	"	{\n"

	"		gl_Position =  ftransform();\n"

	"		normal = normalize(gl_NormalMatrix * gl_Normal);\n"

	"		eig = eigenvalue;\n"

	"		eig2 = eigenvalue2;\n"

	"	}\n";

	string fss =

	"#version 120\n"

	"#extension GL_EXT_gpu_shader4 : enable\n"

	"	\n"

	"	varying vec3 normal;\n"

	"	varying float eig;\n"

	"	varying float eig2;\n"

	"	uniform float eig_max;\n"

	"	uniform float eig_max2;\n"

	"	uniform bool do_highlight;\n"

	"	uniform bool do_diffuse;\n"

	"	const vec3 light_dir = vec3(0,0,1);\n"

	"	\n"

	" float basef(float x) {return max(0.0,min(1.0,2.0-4.0*abs(x)));\n}"

	"	void main()\n"

	"	{\n"

	"		float dot_ln = max(0.0,dot(light_dir, normal));\n"

	"		\n"

	"		float eig_norm = eig/eig_max;\n"

	"		float stripe_signal = 250 * eig_norm;\n"

	//"		vec4 stripe_col = abs(stripe_signal) < 3.14 ? vec4(1,1,0,0) : vec4(.4,.4,.4,0);\n"

	"		vec4 stripe_col = -vec4(.4,.4,.4,0);\n"

	"		\n"

	"       float alpha = (1.0-eig_norm) * 2.0 * 3.1415926;\n"

	"       float offs = 2.0*3.1415/3.0;\n"

	"		gl_FragColor = vec4(0,0,1,0)*basef(eig_norm)+vec4(0,1,0,0)*basef(eig_norm-0.5)+vec4(1,0,0,0)* basef(eig_norm-1.0);\n"

	"		if(do_diffuse)   gl_FragColor *= dot_ln;\n"

	"		if(do_highlight) gl_FragColor += dot_ln*dot_ln*dot_ln*dot_ln*dot_ln*dot_ln*dot_ln*vec4(.5,.5,.5,0);\n"

	"		gl_FragColor -= vec4(.4,.4,.4,.4)*smoothstep(0.2,0.6,cos(stripe_signal));\n"

	"	}\n";

    HarmonicsRenderer::HarmonicsRenderer(HMesh::Manifold& _m, HMesh::Harmonics* _h, GLGraphics::Console& cs): m(&_m), h(_h)

    {

        if (prog_P0 == 0) {

            string shader_path = "/Users/jab/GEL/apps/MeshEdit/";

            GLuint vs = create_glsl_shader(GL_VERTEX_SHADER, vss);

            GLuint fs = create_glsl_shader(GL_FRAGMENT_SHADER, fss);

            // Create the program

            prog_P0 = glCreateProgram();

            // Attach all shaders

            if(vs) glAttachShader(prog_P0, vs);

            if(fs) glAttachShader(prog_P0, fs);

            // Link the program object and print out the info log

            glLinkProgram(prog_P0);

            print_glsl_program_log(prog_P0);

            // Install program object as part of current state

            glUseProgram(0);

            display_harmonics_diffuse.reg(cs, "display.harmonics.diffuse", "");

            display_harmonics_time.reg(cs, "display.harmonics.time", "");

            display_harmonics_highlight.reg(cs, "display.harmonics.highlight", "");

        }

        draw_adf();

    }

    void HarmonicsRenderer::parse_key(unsigned char key)

    {

        switch(key) {

            case '+':

                display_harmonics_time = display_harmonics_time+0.001;

                break;

            case '-':

                display_harmonics_time = display_harmonics_time-0.001;

                break;

            case 'd':

                display_harmonics_diffuse = !display_harmonics_diffuse;

                break;

            case 'h':

                display_harmonics_highlight = !display_harmonics_highlight;

                break;

        }

    }

    void HarmonicsRenderer::draw_adf()

    {

        VertexAttributeVector<double> F;

        double F_max = h->compute_adf(F, display_harmonics_time);

        cout << "F max" <<  F_max << endl;

        glNewList(display_list, GL_COMPILE);

        glUseProgram(prog_P0);

        glUniform1f(glGetUniformLocation(prog_P0,"eig_max"),F_max);//2*M_PI);

        glUniform1i(glGetUniformLocation(prog_P0,"do_diffuse"),display_harmonics_diffuse);

        glUniform1i(glGetUniformLocation(prog_P0,"do_highlight"),display_harmonics_highlight);

        GLuint attrib = glGetAttribLocationARB(prog_P0, "eigenvalue");

        glFrontFace(GL_CW);

        for(FaceIDIterator f = m->faces_begin(); f != m->faces_end(); ++f){

            glBegin(GL_TRIANGLES);

            for(Walker w = m->walker(*f); !w.full_circle(); w = w.circulate_face_cw()){

                glVertexAttrib1f(attrib,F[w.vertex()]);

                glNormal3dv(normal(*m, w.vertex()).get());

                glVertex3dv(m->pos(w.vertex()).get());

            }

            glEnd();

        }

        glFrontFace(GL_CCW);

        glUseProgram(0);

        glEndList();

    }

}