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// * 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 "graphics/core/color.h"
#include "math/intpoint.h"
// Graphics module namespace
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
TexImgFormat format;
//! Minification filter
TexMinFilter minFilter;
//! Magnification filter
TexMagFilter magFilter;
//! Constructor; calls LoadDefault()
TextureCreateParams()
{ LoadDefault(); }
//! Loads the default values
inline void LoadDefault()
{
format = TEX_IMG_RGB;
mipmap = false;
minFilter = TEX_MIN_FILTER_NEAREST;
magFilter = 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 features of graphics engine, not any particular texture.
*/
struct TextureStageParams
{
//! Mixing operation done on color values
TexMixOperation colorOperation;
//! 1st argument of color operations
TexMixArgument colorArg1;
//! 2nd argument of color operations
TexMixArgument colorArg2;
//! Mixing operation done on alpha values
TexMixOperation alphaOperation;
//! 1st argument of alpha operations
TexMixArgument alphaArg1;
//! 2nd argument of alpha operations
TexMixArgument alphaArg2;
//! Wrap mode for 1st tex coord
TexWrapMode wrapS;
//! Wrap mode for 2nd tex coord
TexWrapMode wrapT;
//! Constant color factor (for TEX_MIX_ARG_FACTOR)
Color factor;
//! Constructor; calls LoadDefault()
TextureStageParams()
{ LoadDefault(); }
//! Loads the default values
inline void LoadDefault()
{
colorOperation = TEX_MIX_OPER_DEFAULT;
colorArg1 = TEX_MIX_ARG_COMPUTED_COLOR;
colorArg2 = TEX_MIX_ARG_TEXTURE;
alphaOperation = TEX_MIX_OPER_DEFAULT;
alphaArg1 = TEX_MIX_ARG_COMPUTED_COLOR;
alphaArg2 = TEX_MIX_ARG_TEXTURE;
wrapS = wrapT = 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
{
//! ID of the texture in graphics engine; 0 = invalid texture
unsigned int id;
//! Size of texture
Math::IntPoint size;
//! Whether the texture has alpha channel
bool alpha;
Texture()
{
id = 0;
alpha = false;
}
//! Returns whether the texture is valid (ID != 0)
bool Valid() const
{
return id != 0;
}
//! Sets the ID to invalid value (0)
void SetInvalid()
{
id = 0;
}
//! Comparator for use in texture maps and sets
inline bool operator<(const 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 Texture &other) const
{
if (Valid() != other.Valid())
return false;
if ( (! Valid()) && (! other.Valid()) )
return true;
return id == other.id;
}
};
} // namespace Gfx
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