1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
// * This file is part of the COLOBOT source code
// * Copyright (C) 2012, Polish Portal of Colobot (PPC)
// *
// * This program is free software: you can redistribute it and/or modify
// * it under the terms of the GNU General Public License as published by
// * the Free Software Foundation, either version 3 of the License, or
// * (at your option) any later version.
// *
// * This program is distributed in the hope that it will be useful,
// * but WITHOUT ANY WARRANTY; without even the implied warranty of
// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// * GNU General Public License for more details.
// *
// * You should have received a copy of the GNU General Public License
// * along with this program. If not, see http://www.gnu.org/licenses/.
/**
* \file graphics/core/texture.h
* \brief Texture struct and related enums
*/
#pragma once
#include "math/intpoint.h"
namespace Gfx {
/**
\enum TexImgFormat
\brief Format of image data */
enum TexImgFormat
{
//! Try to determine automatically (may not work)
TEX_IMG_AUTO,
//! RGB triplet, 3 bytes
TEX_IMG_RGB,
//! BGR triplet, 3 bytes
TEX_IMG_BGR,
//! RGBA triplet, 4 bytes
TEX_IMG_RGBA,
//! BGRA triplet, 4 bytes
TEX_IMG_BGRA
};
/**
\enum TexMinFilter
\brief Texture minification filter
Corresponds to OpenGL modes but should translate to DirectX too. */
enum TexMinFilter
{
TEX_MIN_FILTER_NEAREST,
TEX_MIN_FILTER_LINEAR,
TEX_MIN_FILTER_NEAREST_MIPMAP_NEAREST,
TEX_MIN_FILTER_LINEAR_MIPMAP_NEAREST,
TEX_MIN_FILTER_NEAREST_MIPMAP_LINEAR,
TEX_MIN_FILTER_LINEAR_MIPMAP_LINEAR
};
/**
\enum TexMagFilter
\brief Texture magnification filter */
enum TexMagFilter
{
TEX_MAG_FILTER_NEAREST,
TEX_MAG_FILTER_LINEAR
};
/**
\enum TexWrapMode
\brief Wrapping mode for texture coords */
enum TexWrapMode
{
TEX_WRAP_CLAMP,
TEX_WRAP_REPEAT
};
/**
\enum TexMixOperation
\brief Multitexture mixing operation */
enum TexMixOperation
{
//! Default operation on default params (modulate on computed & texture)
TEX_MIX_OPER_DEFAULT,
//! = Arg1
TEX_MIX_OPER_REPLACE,
//! = Arg1 * Arg2
TEX_MIX_OPER_MODULATE,
//! = Arg1 + Arg2
TEX_MIX_OPER_ADD,
//! = Arg1 - Arg2
TEX_MIX_OPER_SUBTRACT
};
/**
\enum TexMixArgument
\brief Multitexture mixing argument */
enum TexMixArgument
{
//! Color from current texture
TEX_MIX_ARG_TEXTURE,
//! Color computed by previous texture unit (current in DirectX; previous in OpenGL)
TEX_MIX_ARG_COMPUTED_COLOR,
//! (Source) color of textured fragment (diffuse in DirectX; primary color in OpenGL)
TEX_MIX_ARG_SRC_COLOR,
//! Constant color (texture factor in DirectX; texture env color in OpenGL)
TEX_MIX_ARG_FACTOR
};
/**
\struct TextureCreateParams
\brief Parameters for texture creation
These params define how particular texture is created and later displayed.
They must be specified at texture creation time and cannot be changed later. */
struct TextureCreateParams
{
//! Whether to generate mipmaps
bool mipmap;
//! Format of source image data
Gfx::TexImgFormat format;
//! Minification filter
Gfx::TexMinFilter minFilter;
//! Magnification filter
Gfx::TexMagFilter magFilter;
//! Constructor; calls LoadDefault()
TextureCreateParams()
{ LoadDefault(); }
//! Loads the default values
inline void LoadDefault()
{
format = Gfx::TEX_IMG_RGB;
mipmap = false;
minFilter = Gfx::TEX_MIN_FILTER_NEAREST;
magFilter = Gfx::TEX_MAG_FILTER_NEAREST;
}
};
/**
\struct TextureStageParams
\brief Parameters for a texture unit
These params define the behavior of texturing units (stages).
They can be changed freely and are feature of graphics engine, not any particular texture. */
struct TextureStageParams
{
//! Mixing operation done on color values
Gfx::TexMixOperation colorOperation;
//! 1st argument of color operations
Gfx::TexMixArgument colorArg1;
//! 2nd argument of color operations
Gfx::TexMixArgument colorArg2;
//! Mixing operation done on alpha values
Gfx::TexMixOperation alphaOperation;
//! 1st argument of alpha operations
Gfx::TexMixArgument alphaArg1;
//! 2nd argument of alpha operations
Gfx::TexMixArgument alphaArg2;
//! Wrap mode for 1st tex coord
Gfx::TexWrapMode wrapS;
//! Wrap mode for 2nd tex coord
Gfx::TexWrapMode wrapT;
//! Constructor; calls LoadDefault()
TextureStageParams()
{ LoadDefault(); }
//! Loads the default values
inline void LoadDefault()
{
colorOperation = Gfx::TEX_MIX_OPER_DEFAULT;
colorArg1 = Gfx::TEX_MIX_ARG_COMPUTED_COLOR;
colorArg2 = Gfx::TEX_MIX_ARG_TEXTURE;
alphaOperation = Gfx::TEX_MIX_OPER_DEFAULT;
alphaArg1 = Gfx::TEX_MIX_ARG_COMPUTED_COLOR;
alphaArg2 = Gfx::TEX_MIX_ARG_TEXTURE;
wrapS = wrapT = Gfx::TEX_WRAP_REPEAT;
}
};
/**
\struct Texture
\brief Info about a texture
Identifies (through id) a texture created in graphics engine.
Also contains some additional data. */
struct Texture
{
//! Whether the texture (ID) is valid
bool valid;
//! ID of the texture in graphics engine
unsigned int id;
//! Size of texture
Math::IntPoint size;
//! Whether the texture has alpha channel
bool alpha;
Texture()
{
valid = false;
id = 0;
alpha = false;
}
//! Comparator for use in texture maps and sets
inline bool operator<(const Gfx::Texture &other) const
{
// Invalid textures are always "less than" every other texture
if ( (!valid) && (!other.valid) )
return false;
if (!valid)
return true;
if (!other.valid)
return false;
return id < other.id;
}
//! Comparator
inline bool operator==(const Gfx::Texture &other) const
{
if (valid != other.valid)
return false;
if ( (!valid) && (!other.valid) )
return true;
return id == other.id;
}
};
}; // namespace Gfx
|
