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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 "../GL/glew.h"

#include "../CGLA/Mat4x4f.h"

#include "../CGLA/Vec3d.h"

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

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

#include "draw.h"

#include "SinglePassWireframeRenderer.h"

#include "IDBufferWireFrameRenderer.h"

#include "SOIL.h"

namespace GLGraphics

{

    using namespace CGLA;

    using namespace Geometry;

    using namespace HMesh;

    using namespace std;

    namespace

    {

        void set_material(const Geometry::Material& material)

        {

            if(material.has_texture && material.tex_id >=0)

            {

                glEnable(GL_TEXTURE_2D);

                glBindTexture(GL_TEXTURE_2D, material.tex_id);

                glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

            }

            else

                glDisable(GL_TEXTURE_2D);

            glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, material.ambient);

            glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, material.diffuse);

            glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material.specular);

            glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, material.shininess);

        }

    }

    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);

    }

    void draw(const Geometry::IndexedFaceSet& geometry)

    {

        glBegin(GL_TRIANGLES);

        for(int i=0;i<geometry.no_faces();i++)

        {

            Vec3i g_face = geometry.face(i);

            Vec3f vert0 = geometry.vertex(g_face[0]);

            Vec3f vert1 = geometry.vertex(g_face[1]);

            Vec3f vert2 = geometry.vertex(g_face[2]);

            Vec3f norm = normalize(cross(vert1-vert0, vert2-vert0));

            glNormal3fv(norm.get());

            glVertex3fv(vert0.get());

            glVertex3fv(vert1.get());

            glVertex3fv(vert2.get());

        }

        glEnd();

    }

    void draw(const Geometry::TriMesh& tm, bool per_vertex_norms)

    {

        int old_mat_idx = -1;

        glBegin(GL_TRIANGLES);

        for(int i=0;i<tm.geometry.no_faces();i++)

        {

            int new_mat_idx = i<static_cast<int>(tm.mat_idx.size()) ? tm.mat_idx[i] : -1;

            if(new_mat_idx != old_mat_idx)

            {

                glEnd();

                set_material(tm.materials[tm.mat_idx[i]]);

                glBegin(GL_TRIANGLES);

                old_mat_idx = new_mat_idx;

            }

            Vec3i n_face = tm.normals.face(i);

            Vec3i g_face = tm.geometry.face(i);

            Vec3i t_face = tm.texcoords.face(i);

            if(!per_vertex_norms)

            {

                Vec3f vert0 = tm.geometry.vertex(g_face[0]);

                Vec3f vert1 = tm.geometry.vertex(g_face[1]);

                Vec3f vert2 = tm.geometry.vertex(g_face[2]);

                Vec3f norm = normalize(cross(vert1-vert0, vert2-vert0));

                glNormal3fv(norm.get());

            }

            for(int j=0;j<3;j++)

            {

                if(per_vertex_norms && n_face != Geometry::NULL_FACE)

                {

                    Vec3f norm = tm.normals.vertex(n_face[j]);

                    glNormal3fv(norm.get());

                }

                if(t_face != Geometry::NULL_FACE)

                {

                    Vec3f texc = tm.texcoords.vertex(t_face[j]);

                    glTexCoord2fv(texc.get());

                }

                Vec3f vert = tm.geometry.vertex(g_face[j]);

                glVertex3fv(vert.get());

            }

        }

        glEnd();

        glDisable(GL_TEXTURE_2D);

    }

    void load_textures(Geometry::TriMesh& tm)

    {

        for(unsigned int i=0;i<tm.materials.size(); ++i)

        {

            Geometry::Material& mat = tm.materials[i];

            if(mat.tex_name != "")

            {

                string name = mat.tex_path + mat.tex_name;

                mat.tex_id = SOIL_load_OGL_texture(name.data(), 0, 0, SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_INVERT_Y | SOIL_FLAG_POWER_OF_TWO);

            }

        }

    }

	/// Draw an object of type T which contains only triangles as wireframe. In practice T = Manifold or TriMesh.

	template<typename T>

    void draw_triangles_in_wireframe(T& m, bool per_vertex_norms, const CGLA::Vec3f& line_color)

	{

		static SinglePassWireframeRenderer swr;

		swr.enable(line_color);

		draw(m, per_vertex_norms);

		swr.disable();

	}

	template

    void draw_triangles_in_wireframe(HMesh::Manifold& m, bool per_vertex_norms, const CGLA::Vec3f& line_color);

	template

    void draw_triangles_in_wireframe(Geometry::TriMesh& m, bool per_vertex_norms, const CGLA::Vec3f& line_color);

    template<class T>

    void draw_wireframe_oldfashioned(const T& m, bool per_vertex_norms, const Vec3f& line_color)

    {

        // Store state that we change

        glPushAttrib(GL_POLYGON_BIT);

        GLboolean lights_on;

        glGetBooleanv(GL_LIGHTING, &lights_on);

        Vec4f current_color;

        glGetFloatv(GL_CURRENT_COLOR, &current_color[0]);

        // Draw filled

        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);

        draw(m, per_vertex_norms);

        // Draw lines

        glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

        glDisable(GL_LIGHTING);

        glEnable(GL_POLYGON_OFFSET_LINE);

        glPolygonOffset(0,-5);

        glColor3fv(line_color.get());

        draw(m, per_vertex_norms);

        // Put back old state

        glColor3fv(current_color.get());

        if(lights_on) glEnable(GL_LIGHTING);

        glPopAttrib();

    }

    template

    void draw_wireframe_oldfashioned(const HMesh::Manifold& m, bool per_vertex_norms, const Vec3f& line_color);

    template

    void draw_wireframe_oldfashioned(const Geometry::TriMesh& m, bool per_vertex_norms, const Vec3f& line_color);

    void draw(const Manifold& m, bool per_vertex_norms)

    {

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

            if(!per_vertex_norms)

                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(per_vertex_norms)

                    glNormal3dv(n.get());

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

            }

            glEnd();

        }

    }

    bool depth_pick(int x, int y, float& depth)

    {

        float new_depth;

        // Get the minimum and maximum depth values.

        float minmax_depth[2];

        glGetFloatv(GL_DEPTH_RANGE, minmax_depth);

        glPushAttrib(GL_PIXEL_MODE_BIT);

        glReadBuffer(GL_FRONT);

        // Read a single pixel at the position of the mouse cursor.

        glReadPixels(x, y, 1,1, GL_DEPTH_COMPONENT,

                     GL_FLOAT, (void*) &new_depth);

        glPopAttrib();

        // If the depth corresponds to the far plane, we clicked on the

        // background.

        if(new_depth == minmax_depth[1])

            return false;

        depth = new_depth;

        return true;

    }

    Vec3d screen2world(int x, int y, float depth)

    {

        // Enquire about the viewport dimensions

        GLint viewport[4];

        glGetIntegerv(GL_VIEWPORT, viewport);

        // Copy modelview matrix.

        double mvmat[16];

        glGetDoublev(GL_MODELVIEW_MATRIX, mvmat);

        // Copy the projection matrix. We assume it is unchanged.

        double prjmat[16];

        glGetDoublev(GL_PROJECTION_MATRIX, prjmat);

        // Now unproject the point from screen to world coordinates.

        double ox, oy, oz;

        gluUnProject(x, y,depth,

                     mvmat,prjmat,viewport,

                     &ox, &oy, &oz);

        return Vec3d(ox,oy,oz);

    }

    Vec3d world2screen(const Vec3d& p)

    {

        // Enquire about the viewport dimensions

        GLint viewport[4];

        glGetIntegerv(GL_VIEWPORT, viewport);

        // Copy modelview matrix.

        double mvmat[16];

        glGetDoublev(GL_MODELVIEW_MATRIX, mvmat);

        // Copy the projection matrix. We assume it is unchanged.

        double prjmat[16];

        glGetDoublev(GL_PROJECTION_MATRIX, prjmat);

        // Now unproject the point from screen to world coordinates.

        double ox, oy, oz;

        gluProject(p[0], p[1], p[2],

                   mvmat,prjmat,viewport,

                     &ox, &oy, &oz);

        return Vec3d(ox,oy,oz);

    }

    void draw(const Geometry::AABox& box)

    {

        glBegin(GL_QUADS);

        Vec3f norm_neg[] = {Vec3f(0,0,-1), Vec3f(-1,0,0), Vec3f(0,-1,0)};

        Vec3f norm_pos[] = {Vec3f(0,0, 1), Vec3f( 1,0,0), Vec3f(0, 1,0)};

        for(int j=0;j<3;++j)

        {

            glNormal3fv(norm_neg[j].get());

            Vec3f p = box.get_pmin();

            glVertex3f(p[0], p[1], p[2]);

            p[(j+1)%3] = box.get_pmax()[(j+1)%3];

            glVertex3f(p[0], p[1], p[2]);

            p[j] = box.get_pmax()[j];

            glVertex3f(p[0], p[1], p[2]);

            p[(j+1)%3] = box.get_pmin()[(j+1)%3];

            glVertex3f(p[0], p[1], p[2]);

        }

        glEnd();

        glBegin(GL_QUADS);

        for(int j=0;j<3;++j)

        {

            glNormal3fv(norm_pos[j].get());

            Vec3f p = box.get_pmax();

            glVertex3f(p[0], p[1], p[2]);

            p[j] = box.get_pmin()[j];

            glVertex3f(p[0], p[1], p[2]);

            p[(j+1)%3] = box.get_pmin()[(j+1)%3];

            glVertex3f(p[0], p[1], p[2]);

            p[j] = box.get_pmax()[j];

            glVertex3f(p[0], p[1], p[2]);

        }

        glEnd();

    }

    void draw(const Geometry::OBox& box)

    {

        Mat4x4f m = identity_Mat4x4f();

        copy_matrix(box.get_rotation(), m);

        glPushMatrix();

        glMultMatrixf(m.get());

        draw(box.get_aabox());

        glPopMatrix();

    }

    /** Draw the tree. The first argument is the level counter, the second

     argument is the level at which to stop drawing. */

    template <class BoxType>

    void draw(const Geometry::BoundingINode<BoxType>& node, int level, int max_level)

    {

        if(level == max_level)

        {

            draw(node);

            return;

        }

        node->left->draw(level + 1, max_level);

        node->right->draw(level + 1, max_level);

    }

    template <class BoxType>

    void draw(const Geometry::BoundingLNode<BoxType>& node, int level, int max_level)

    {

#if USE_LEAF_BOXES

        draw(node); 

#endif

    }

    template <class BoxType>

    void draw(const Geometry::BoundingTree<BoxType>& tree, int max_level)

    {

        draw(*tree.root, 0, max_level);

    }

}