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/*

 *  WireframeRenderer.cpp

 *  GEL

 *

 *  Created by J. Andreas Bærentzen on 20/09/08.

 *  Copyright 2008 __MyCompanyName__. All rights reserved.

 *

 */

#include <algorithm>

#include <string>

#include <cstdlib>

#include <CGLA/Mat3x3d.h>

#include <GLGraphics/glsl_shader.h>

#include <HMesh/FaceCirculator.h>

#include <GLConsole/GLConsole.h>

#include "Renderer.h"

#include "curvature.h"

using namespace GLGraphics;

using namespace CGLA;

using namespace HMesh;

using namespace std;

using namespace CVarUtils;

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(HMesh::Manifold& m)

{

	int max_val = 0;

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

		max_val = max(max_val, no_edges(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)

		idbuff_renderer->draw(Vec3f(1,0,0),Vec3f(0.5)); 

	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(Manifold& m, bool smooth)

{

	glNewList(display_list,GL_COMPILE);

	GLGraphics::draw(m, smooth);

	glEndList();	

}

void SimpleShaderRenderer::draw()

{

	GLint old_prog;

	glGetIntegerv(GL_CURRENT_PROGRAM, &old_prog);

	glUseProgram(prog);

	glCallList(display_list);

	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"

"	// 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(0.5,0.5,0.4,0.0) + smoothstep(0.8, 1.0,cos(13.0*angle)) * vec4(0.5,0.5,0.6,0.0);\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 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(0.5,0.5,0.4,0.0) + smoothstep(0.8, 1.0,cos(20.0*angle)) * vec4(0.5,0.5,0.6,0.0);\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 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::draw()

{

	GLint old_prog;

	glGetIntegerv(GL_CURRENT_PROGRAM, &old_prog);

	glUseProgram(prog);

	glBindTexture(GL_TEXTURE_3D, get_noise_texture_id());

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

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

	glCallList(display_list);

	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 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"

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

"		\n"

"		float s_norm = s/scalar_max;\n"

"		float stripe_signal = 100.0 * s_norm;\n"

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

ScalarFieldRenderer::ScalarFieldRenderer(HMesh::Manifold& m, bool smooth,

										 std::vector<double>& field, double max_val):

SimpleShaderRenderer(vss,fss)

{

	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(FaceIter f=m.faces_begin(); f != m.faces_end(); ++f)

	{

		FaceCirculator fc(f);

		if(!smooth) 

			glNormal3fv(normal(f).get());

		if(no_edges(f)== 3) 

			glBegin(GL_TRIANGLES);

		else 

			glBegin(GL_POLYGON);

		while(!fc.end())

		{

			Vec3d n(normal(fc.get_vertex()));

			if(smooth) 

				glNormal3dv(n.get());

			int i = fc.get_vertex()->touched;

			glVertexAttrib1d(scalar_attrib, field[i]);

			glVertex3fv(fc.get_vertex()->pos.get());

			++fc;

		}

		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"

"   uniform float gamma;\n"

"   uniform bool lighton;\n"

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

"	\n"

"	void main()\n"

"	{\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"

"       if(lighton) 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"

"	}\n";

AmbientOcclusionRenderer::AmbientOcclusionRenderer(HMesh::Manifold& m, bool smooth,

												   std::vector<double>& field, double max_val):

SimpleShaderRenderer(vss,fss)

{	

	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.ambient_occlusion_renderer.gamma",1.5f);

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

	static int& lighton = CreateCVar("display.ambient_occlusion_renderer.light",1);

	glUniform1iARB(glGetUniformLocationARB(prog, "lighton"), lighton);

	glNewList(display_list,GL_COMPILE);

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

	{

		FaceCirculator fc(f);

		if(!smooth) 

			glNormal3fv(normal(f).get());

		if(no_edges(f)== 3) 

			glBegin(GL_TRIANGLES);

		else 

			glBegin(GL_POLYGON);

		while(!fc.end())

		{

			Vec3d n(normal(fc.get_vertex()));

			if(smooth) 

				glNormal3dv(n.get());

			int i = fc.get_vertex()->touched;

			glVertexAttrib1d(scalar_attrib, field[i]);

			glVertex3fv(fc.get_vertex()->pos.get());

			++fc;

		}

		glEnd();

	}

	glEndList();	

	glUseProgram(old_prog);

}

const string CopperRenderer::vss =

"	attribute float scalar;\n"

"	varying vec3 normal;\n"

"varying vec3 v_obj;\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"

"       v_obj = gl_Vertex.xyz;\n"

"	}\n";

const string CopperRenderer::fss =

"uniform sampler3D noise_tex;\n"

"uniform float noise_scale;\n"

"	varying vec3 normal;\n"

"   varying vec3 v_obj;\n"

"	varying float s;\n"

"	uniform float scalar_max;\n"

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

"	\n"

"   float turb(vec3 x) { return 0.25*(texture3D(noise_tex,0.12*noise_scale*x).x+\n"

"			texture3D(noise_tex,0.531*noise_scale*x).x+\n"

"			texture3D(noise_tex,0.098*noise_scale*x).x+\n"

"			texture3D(noise_tex,1.0121*noise_scale*x).x);}\n"

"	void main()\n"

"	{\n"

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

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

"		float spec = pow(dot(r, normal),20.0);\n"

"		\n"

"		float s_norm = 0.95*s/scalar_max+0.05*turb(v_obj);\n"

"       vec4 copper =  vec4(1,0.70,.5,1);\n"

"       vec4 corroded =  vec4(0.43,0.59,0.5,1)+vec4(0.15,0.15,0.15,1.0)*abs(0.5+0.5*turb(v_obj));\n"

"		vec4 material = copper*smoothstep(0.15,0.25,s_norm) + \n"

"		corroded*smoothstep(0.25,0.15,s_norm)*smoothstep(-0.3,-0.05,s_norm);\n"

"		gl_FragColor = material*diff+smoothstep(0.15,0.25,s_norm)*vec4(0.3,0.3,0.3,1)*spec;\n"

"	}\n";

CopperRenderer::CopperRenderer(HMesh::Manifold& m, bool smooth,

							   std::vector<double>& field, double max_val, float _bsphere_rad): 

SimpleShaderRenderer(vss,fss), bsphere_rad(_bsphere_rad)

{

	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.patina_renderer.gamma",1.5f);

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

	static int& lighton = CreateCVar("display.patina_renderer.light",1);

	glUniform1iARB(glGetUniformLocationARB(prog, "lighton"), lighton);

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

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

	glNewList(display_list,GL_COMPILE);

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

	{

		FaceCirculator fc(f);

		if(!smooth) 

			glNormal3fv(normal(f).get());

		if(no_edges(f)== 3) 

			glBegin(GL_TRIANGLES);

		else 

			glBegin(GL_POLYGON);

		while(!fc.end())

		{

			Vec3d n(normal(fc.get_vertex()));

			if(smooth) 

				glNormal3dv(n.get());

			int i = fc.get_vertex()->touched;

			glVertexAttrib1d(scalar_attrib, field[i]);

			glVertex3fv(fc.get_vertex()->pos.get());

			++fc;

		}

		glEnd();

	}

	glEndList();	

	glUseProgram(old_prog);

}

void CopperRenderer::draw()

{

	GLint old_prog;

	glGetIntegerv(GL_CURRENT_PROGRAM, &old_prog);

	glUseProgram(prog);

	glBindTexture(GL_TEXTURE_3D, get_noise_texture_id());

	glCallList(display_list);

	glUseProgram(old_prog);

}

LineFieldRenderer::LineFieldRenderer(HMesh::Manifold& m, bool smooth, vector<Vec3d>& lines, float _r): 

	SimpleShaderRenderer(vss,fss), r(_r)

{

	GLint old_prog;

	glGetIntegerv(GL_CURRENT_PROGRAM, &old_prog);

	glUseProgram(prog);	

	static float& curvature_lines_scale = CreateCVar("display.line_field_renderer.line_length", .015f);

	static float& noise_scale = CreateCVar("display.line_field_renderer.noise_scale", 12.0f/r);

	static float& noise_amplitude = CreateCVar("display.line_field_renderer.noise_amplitude", .06f);

	glUniform1fARB(glGetUniformLocationARB(prog, "scale_line"),curvature_lines_scale);

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

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

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

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

	glNewList(display_list,GL_COMPILE);

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

	{

		FaceCirculator fc(f);

		if(!smooth) 

			glNormal3fv(normal(f).get());

		if(no_edges(f)== 3) 

			glBegin(GL_TRIANGLES);

		else 

			glBegin(GL_POLYGON);

		while(!fc.end())

		{

			Vec3d n(normal(fc.get_vertex()));

			if(smooth) 

				glNormal3dv(n.get());

			int i = fc.get_vertex()->touched;

			Vec3d d = lines[i];

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

			glVertexAttrib3dv(direction, d.get());

			glVertex3fv(fc.get_vertex()->pos.get());

			++fc;

		}

		glEnd();

	}

	glBindTexture(GL_TEXTURE_3D, 0);

	glEndList();	

	glUseProgram(old_prog);

}

void LineFieldRenderer::draw()

{

	GLint old_prog;

	glGetIntegerv(GL_CURRENT_PROGRAM, &old_prog);

	glUseProgram(prog);

	glBindTexture(GL_TEXTURE_3D, get_noise_texture_id());

	glCallList(display_list);

	glBindTexture(GL_TEXTURE_3D, 0);

	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 scale_line;\n"

"uniform float noise_amplitude;\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(0.23,0.25,texture3D(noise_tex, p).x);}\n"

"void main(void)\n"

"{\n"

"   float I = "

"             tex(noise_scale*v_obj + 6.0*scale_line*dir_obj) + \n"

"             tex(noise_scale*v_obj - 6.0*scale_line*dir_obj) + \n"

"             tex(noise_scale*v_obj + 5.0*scale_line*dir_obj) + \n"

"             tex(noise_scale*v_obj - 5.0*scale_line*dir_obj) + \n"

"             tex(noise_scale*v_obj + 4.0*scale_line*dir_obj) + \n"

"             tex(noise_scale*v_obj - 4.0*scale_line*dir_obj) + \n"

"             tex(noise_scale*v_obj + 3.0*scale_line*dir_obj) + \n"

"             tex(noise_scale*v_obj - 3.0*scale_line*dir_obj) + \n"

"             tex(noise_scale*v_obj + 2.0*scale_line*dir_obj) + \n"

"             tex(noise_scale*v_obj - 2.0*scale_line*dir_obj) + \n"

"             tex(noise_scale*v_obj + 1.0*scale_line*dir_obj) + \n"

"             tex(noise_scale*v_obj - 1.0*scale_line*dir_obj) + \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(1)*diff*I*(1.0/13.0);\n"

"	gl_FragColor.a = 1.0;\n"

"}\n";

const string DualVertexRenderer::vss = 

"#version 120\n"

"#extension GL_EXT_gpu_shader4 : enable\n"

"varying vec4 diffuseIn;\n"

"varying vec3 normalIn;\n"

"void main(void)\n"

"{\n"

"   diffuseIn = gl_Color;\n"

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

"   gl_Position =  ftransform();\n"

"}\n";

const string DualVertexRenderer::gss = 

"#version 120\n"

"#extension GL_EXT_gpu_shader4 : enable\n"

"#extension GL_EXT_geometry_shader4 : enable\n"

"\n"

"varying in vec4 diffuseIn[3];\n"

"varying in vec3 normalIn[3];\n"

"varying vec4 diffuse[3];\n"

"varying float f;\n"

"varying vec3 normal;\n"

"void main(void)\n"

"{\n"

"  diffuse[0] = diffuseIn[0];\n"

"  diffuse[1] = diffuseIn[1];\n"

"  diffuse[2] = diffuseIn[2];\n"

"\n"

"  f = diffuseIn[0].a;\n"

"  gl_Position = gl_PositionIn[0];\n"

"  normal = normalIn[0];\n"

"  EmitVertex();\n"

"	\n"

"  f = diffuseIn[1].a;\n"

"  gl_Position = gl_PositionIn[1];\n"

"  normal = normalIn[1];\n"

"  EmitVertex();\n"

"\n"

"  f = diffuseIn[2].a;\n"

"  gl_Position = gl_PositionIn[2];\n"

"  normal = normalIn[2];\n"

"  EmitVertex();\n"

"\n"

"  EndPrimitive();\n"

"}\n";

const string DualVertexRenderer::fss =

"#version 120\n"

"#extension GL_EXT_gpu_shader4 : enable\n"

"\n"

"varying float f;\n"

"varying vec4 diffuse[3];\n"

"varying vec3 normal;\n"

"\n"

"void main(void)\n"

"{\n"

"   float col_idx=0;\n"

"   if(f>diffuse[0].g && f<diffuse[0].b)\n"

"      col_idx = diffuse[0].r;\n"

"   else if(f>diffuse[1].g && f<diffuse[1].b)\n"

"      col_idx = diffuse[1].r;\n"

"   else if(f>diffuse[2].g && f<diffuse[2].b)\n"

"      col_idx = diffuse[2].r;\n"

"   vec4 col = col_idx < .5 ? vec4(1,0,0,0) : vec4(0,0,1,0);\n"

"\n"

" 	gl_FragColor =col*dot(normal, vec3(0,0,1));\n"

"}\n";

	DualVertexRenderer::DualVertexRenderer(HMesh::Manifold& m, std::vector<Vec4d>& field)

	{		

		// Create the program

		static GLuint prog = glCreateProgram();

		static bool was_here = false;

		if(!was_here)

		{

			was_here = true;

			// Create s	haders directly from file

			static GLuint vs = create_glsl_shader(GL_VERTEX_SHADER, vss);

			static GLuint gs = create_glsl_shader(GL_GEOMETRY_SHADER_EXT, gss);

			static GLuint fs = create_glsl_shader(GL_FRAGMENT_SHADER, fss);

			// Attach all shaders

			if(vs) glAttachShader(prog, vs);

			if(gs) glAttachShader(prog, gs);

			if(fs) glAttachShader(prog, fs);

			// Specify input and output for the geometry shader. Note that this must be

			// done before linking the program.

			glProgramParameteriEXT(prog,GL_GEOMETRY_INPUT_TYPE_EXT,GL_TRIANGLES);

			glProgramParameteriEXT(prog,GL_GEOMETRY_VERTICES_OUT_EXT,3);

			glProgramParameteriEXT(prog,GL_GEOMETRY_OUTPUT_TYPE_EXT,GL_TRIANGLE_STRIP);

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

			glLinkProgram(prog);

		}

		GLint old_prog;

		glGetIntegerv(GL_CURRENT_PROGRAM, &old_prog);

		glNewList(display_list,GL_COMPILE);

		glUseProgram(prog);

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

		{

			FaceCirculator fc(f);

			if(no_edges(f) != 3) 

				continue;

			else 

				glBegin(GL_TRIANGLES);

			while(!fc.end())

			{

				Vec3d n(normal(fc.get_vertex()));

				glNormal3dv(n.get());

				int i = fc.get_vertex()->touched;

				glColor4dv(field[i].get());

				glVertex3fv(fc.get_vertex()->pos.get());

				++fc;

			}

			glEnd();

		}

		glUseProgram(old_prog);

		glEndList();	

	}