1 //
2 //  SuperTuxKart - a fun racing game with go-kart
3 //  Copyright (C) 2004-2015 Ingo Ruhnke <grumbel@gmx.de>
4 //  Copyright (C) 2013-2015 Joerg Henrichs
5 //
6 //  This program is free software; you can redistribute it and/or
7 //  modify it under the terms of the GNU General Public License
8 //  as published by the Free Software Foundation; either version 3
9 //  of the License, or (at your option) any later version.
10 //
11 //  This program is distributed in the hope that it will be useful,
12 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
13 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 //  GNU General Public License for more details.
15 //
16 //  You should have received a copy of the GNU General Public License
17 //  along with this program; if not, write to the Free Software
18 //  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
19 
20 #ifndef HEADER_SKID_MARK_HPP
21 #define HEADER_SKID_MARK_HPP
22 
23 #include <aabbox3d.h>
24 #include <memory>
25 #include <SColor.h>
26 #include <vector>
27 
28 using namespace irr;
29 
30 class Material;
31 
32 namespace SP
33 {
34     class SPDynamicDrawCall;
35     class SPShader;
36 }
37 
38 #include "utils/no_copy.hpp"
39 #include "utils/vec3.hpp"
40 
41 class AbstractKart;
42 
43 /** \brief This class is responsible for drawing skid marks for a kart.
44   * \ingroup graphics
45   */
46 class SkidMarks : public NoCopy
47 {
48 private:
49     /** Reference to the kart to which these skidmarks belong. */
50     const AbstractKart &m_kart;
51 
52     /** True if the kart was skidding in the previous frame. */
53     bool               m_skid_marking;
54 
55     /** Reduce effect of Z-fighting. */
56     float              m_width;
57 
58     /** Initial alpha value. */
59     static const int   m_start_alpha;
60 
61     /** Initial grey value, same for the 3 channels. */
62     static const int   m_start_grey;
63 
64     /** Material to use for the skid marks. */
65     Material* m_material;
66 
67     /** Shader(alphablend) to use for the skid marks. */
68     std::shared_ptr<SP::SPShader> m_shader;
69 
70     // ------------------------------------------------------------------------
71     class SkidMarkQuads : public NoCopy
72     {
73         /** Used to move skid marks at the same location slightly on
74          *  top of each other to avoid a 'wobbling' effect when sometines
75          *  the first and sometimes the 2nd one is drawn on top. */
76         float m_z_offset;
77 
78         /** Fade out = alpha value. */
79         float m_fade_out;
80 
81         video::SColor   m_start_color;
82 
83         /** Vector marking the start of the skidmarks (located between left and right wheel) */
84         Vec3 m_center_start;
85 
86         std::shared_ptr<SP::SPDynamicDrawCall> m_dy_dc;
87 
88     public:
89             SkidMarkQuads (const Vec3 &left, const Vec3 &right,
90                            const Vec3 &normal, Material* material,
91                            std::shared_ptr<SP::SPShader> shader,
92                            float z_offset, video::SColor* custom_color = NULL);
93             ~SkidMarkQuads();
94         void add          (const Vec3 &left,
95                            const Vec3 &right,
96                            const Vec3 &normal,
97                            float distance);
98         bool fade         (float f);
getCenterStart() const99         const Vec3& getCenterStart() const { return m_center_start; }
100     };  // SkidMarkQuads
101 
102     // ------------------------------------------------------------------------
103     /** Two skidmark objects for the left and right wheel. */
104     std::vector<std::unique_ptr<SkidMarkQuads> > m_left, m_right;
105 
106     /** Shared static so that consecutive skidmarks are at a slightly
107      *  different height. */
108     static float                  m_avoid_z_fighting;
109 
110 public:
111          SkidMarks(const AbstractKart& kart, float width=0.32f);
112         ~SkidMarks();
113     void update (float dt, bool force_skid_marks=false,
114                  video::SColor* custom_color = NULL);
115     void reset();
116 
117 };   // SkidMarks
118 
119 #endif
120 
121 /* EOF */
122