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#include "gel_gl.h"
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#include "draw.h"
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using namespace CGLA;
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using namespace std;
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namespace
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{
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void set_material(const Geometry::Material& material)
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{
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    		if(material.tex_id >=0)
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    			{
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    				glEnable(GL_TEXTURE_2D);
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    				glBindTexture(GL_TEXTURE_2D, material.tex_id);
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    				glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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    			}
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    		else
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    			glDisable(GL_TEXTURE_2D);
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    glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, material.ambient);
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    glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, material.diffuse);
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    glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material.specular);
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    glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, material.shininess);
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}
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}
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void draw(const Geometry::TriMesh& tm)
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{
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    int old_mat_idx = -1;
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    glBegin(GL_TRIANGLES);
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    for(int i=0;i<tm.geometry.no_faces();i++)
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    {
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        if(tm.mat_idx[i] != old_mat_idx)
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        {
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            glEnd();
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            set_material(tm.materials[tm.mat_idx[i]]);
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            glBegin(GL_TRIANGLES);
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            old_mat_idx = tm.mat_idx[i];
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        }
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        Vec3i n_face = tm.normals.face(i);
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        Vec3i g_face = tm.geometry.face(i);
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        Vec3i t_face = tm.texcoords.face(i);
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        for(int j=0;j<3;j++)
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        {
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            if(n_face != Geometry::NULL_FACE)
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            {
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                Vec3f norm = tm.normals.vertex(n_face[j]);
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                glNormal3fv(norm.get());
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            }
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            if(t_face != Geometry::NULL_FACE)
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            {
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                Vec3f texc = tm.texcoords.vertex(t_face[j]);
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                glTexCoord2fv(texc.get());
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            }
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            Vec3f vert = tm.geometry.vertex(g_face[j]);
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            glVertex3fv(vert.get());
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        }
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    }
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    glEnd();
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    glDisable(GL_TEXTURE_2D);
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}