1 /**
2 * @file
3 * @brief PNG and texture loading functionality
4 **/
5
6 #pragma once
7
8 #include "tilepick.h"
9
10 enum MipMapOptions
11 {
12 MIPMAP_CREATE,
13 MIPMAP_NONE,
14 MIPMAP_MAX,
15 };
16
17 // Arbitrary post-load texture processing
18 typedef bool(*tex_proc_func)(unsigned char *pixels, unsigned int w,
19 unsigned int h);
20
21 class GenericTexture
22 {
23 public:
24 GenericTexture();
25 virtual ~GenericTexture();
26
27 bool load_texture(const char *filename, MipMapOptions mip_opt,
28 tex_proc_func proc = nullptr,
29 bool force_power_of_two = true);
30 bool load_texture(unsigned char *pixels, unsigned int w, unsigned int h,
31 MipMapOptions mip_opt, int offsetx=-1, int offsety=-1);
32 void unload_texture();
33
width()34 unsigned int width() const { return m_width; }
height()35 unsigned int height() const { return m_height; }
36 void bind() const;
37
orig_width()38 unsigned int orig_width() const { return m_orig_width; }
orig_height()39 unsigned int orig_height() const { return m_orig_height; }
40
41 protected:
42 unsigned int m_handle;
43 unsigned int m_width;
44 unsigned int m_height;
45
46 unsigned int m_orig_width;
47 unsigned int m_orig_height;
48 };
49
50 class TilesTexture : public GenericTexture
51 {
52 public:
53 TilesTexture();
54
55 void set_info(int max, tile_info_func *info);
56 inline const tile_info &get_info(tileidx_t idx) const;
57 inline bool get_coords(tileidx_t idx, int ofs_x, int ofs_y,
58 float &pos_sx, float &pos_sy,
59 float &pos_ex, float &pos_ey,
60 float &tex_sx, float &tex_sy,
61 float &tex_ex, float &tex_ey,
62 bool centre = true, int ymin = -1, int ymax = -1,
63 float tile_x = TILE_X, float tile_y = TILE_Y) const;
64
65 protected:
66 int m_tile_max;
67 tile_info_func *m_info_func;
68 };
69
get_info(tileidx_t idx)70 inline const tile_info &TilesTexture::get_info(tileidx_t idx) const
71 {
72 ASSERT(m_info_func);
73 return m_info_func(idx);
74 }
75
get_coords(tileidx_t idx,int ofs_x,int ofs_y,float & pos_sx,float & pos_sy,float & pos_ex,float & pos_ey,float & tex_sx,float & tex_sy,float & tex_ex,float & tex_ey,bool centre,int ymin,int ymax,float tile_x,float tile_y)76 inline bool TilesTexture::get_coords(tileidx_t idx, int ofs_x, int ofs_y,
77 float &pos_sx, float &pos_sy,
78 float &pos_ex, float &pos_ey,
79 float &tex_sx, float &tex_sy,
80 float &tex_ex, float &tex_ey,
81 bool centre, int ymin, int ymax,
82 float tile_x, float tile_y) const
83 {
84 const tile_info &inf = get_info(idx);
85
86 float fwidth = m_width;
87 float fheight = m_height;
88
89 // Centre tiles on x, but allow taller tiles to extend upwards.
90 int size_ox = centre ? TILE_X / 2 - inf.width / 2 : 0;
91 int size_oy = centre ? TILE_Y - inf.height : 0;
92
93 int pos_sy_adjust = ofs_y + inf.offset_y + size_oy;
94 int pos_ey_adjust = pos_sy_adjust + inf.ey - inf.sy;
95
96 int sy = pos_sy_adjust;
97 if (ymin >= 0)
98 sy = max(ymin, sy);
99
100 int ey = pos_ey_adjust;
101 if (ymax >= 0)
102 ey = min(ymax, ey);
103
104 // Nothing to draw.
105 if (sy >= ey)
106 return false;
107
108 pos_sx += (ofs_x + inf.offset_x + size_ox) / tile_x;
109 pos_sy += sy / tile_y;
110 pos_ex = pos_sx + (inf.ex - inf.sx) / tile_x;
111 pos_ey = pos_sy + (ey - sy) / tile_y;
112
113 tex_sx = inf.sx / fwidth;
114 tex_sy = (inf.sy + sy - pos_sy_adjust) / fheight;
115 tex_ex = inf.ex / fwidth;
116 tex_ey = (inf.ey + ey - pos_ey_adjust) / fheight;
117
118 return true;
119 }
120
121 class ImageManager
122 {
123 public:
124 ImageManager();
125 virtual ~ImageManager();
126
127 bool load_textures(bool need_mips);
128 void unload_textures();
129 inline const tile_info &tile_def_info(tile_def tile) const;
130
131 FixedVector<TilesTexture, TEX_MAX> m_textures;
132 };
133
134 // TODO: This function should be moved elsewhere (where?) and called by
135 // the ImageManager.
tile_def_info(tile_def tile)136 inline const tile_info &ImageManager::tile_def_info(tile_def tile) const
137 {
138 const auto tex_id = get_tile_texture(tile.tile);
139 return m_textures[tex_id].get_info(tile.tile);
140 }
141