diguyGraphicsTexture.h

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/*********************************************************************
 ** Copyright (c) 1992-2015 VT MAK
 ** All rights reserved. 
 *********************************************************************/

/*********************************************************************/
#ifndef __diguyGraphicsTexture_H
#define __diguyGraphicsTexture_H

#ifdef SWIG
%module diguyGraphicsTexture
#else
#define CPLUSPLUS_ONLY
#endif

#ifdef CPLUSPLUS_ONLY
#include <declspec_diguy.h>
#include <diguy_constants.h>

class bdiGeometryTextureFile;
class diguyGraphicsTexture;


#endif

/****************************************************************************/
/*l
 *b  Description:
 **
 **    This enumeration lists the types of compression that texture map data
 **    may have.
 **
 */
typedef enum
{
        DIGUY_GRAPHICS_TEXTURE_COMPRESSION_TYPE_NONE = 0,
        DIGUY_GRAPHICS_TEXTURE_COMPRESSION_TYPE_DXT1,
        DIGUY_GRAPHICS_TEXTURE_COMPRESSION_TYPE_DXT2,
        DIGUY_GRAPHICS_TEXTURE_COMPRESSION_TYPE_DXT3,
        DIGUY_GRAPHICS_TEXTURE_COMPRESSION_TYPE_DXT4,
        DIGUY_GRAPHICS_TEXTURE_COMPRESSION_TYPE_DXT5,
        DIGUY_GRAPHICS_TEXTURE_COMPRESSION_TYPE_DXT5_NM
} diguyGraphicsTextureCompressionType;


/****************************************************************************/
/*l
 *b  Description:
 **
 **    This enumeration lists the type of texture map a given image file is
 **    being used as.
 **
 */
typedef enum
{
        DIGUY_TEXTURE_MAP_TYPE_UNKNOWN = -1,
        DIGUY_TEXTURE_MAP_TYPE_DIFFUSE = 0,
        DIGUY_TEXTURE_MAP_TYPE_SHADOW,
        DIGUY_TEXTURE_MAP_TYPE_SPECULAR,
        DIGUY_TEXTURE_MAP_TYPE_BUMP,
        DIGUY_TEXTURE_MAP_TYPE_COMPONENTS,
        DIGUY_TEXTURE_MAP_TYPE_COMPONENT_RAMP,
        DIGUY_TEXTURE_MAP_TYPE_MISC_1,
        DIGUY_TEXTURE_MAP_TYPE_MISC_2,
        DIGUY_TEXTURE_MAP_TYPE_ANIMATION
} diguyTextureMapType;


/****************************************************************************/
/*l
 *b  Description:
 **
 **    This enumeration lists how the state stores the available textures in
 **    the textures_available bitfield.  Also used by the shader programs.
 **
 */
typedef enum
{
        DIGUY_TEXTURE_MAP_MASK_DIFFUSE    = 0x00000001,
        DIGUY_TEXTURE_MAP_MASK_SHADOW     = 0x00000002,
        DIGUY_TEXTURE_MAP_MASK_SPECULAR   = 0x00000004,
        DIGUY_TEXTURE_MAP_MASK_BUMP       = 0x00000008,
        DIGUY_TEXTURE_MAP_MASK_COMPONENTS = 0x00000010,
        DIGUY_TEXTURE_MAP_MASK_MISC_1     = 0x00000020,
        DIGUY_TEXTURE_MAP_MASK_MISC_2     = 0x00000040,
        DIGUY_TEXTURES_MAP_MASK_ALL       = 0xffffffff
} diguyTextureMapMasks;

/*l
 *b  Description:
 **
 **    This function converts the passed texture type enumeration into
 **    a NULL-terminated C-style string.
 **
 *b  Returns:
 **
 **    C-style string identifying texture map type
 **
 *b  Callable From:
 **
 *-    - C++
 *-    - Script
 */

BDI_DECLSPEC_bdiutil const char* diguy_texture_type_to_string(diguyTextureMapType texture_type);

/*l
 *b  Description:
 **
 **    This function converts the passed C-style string into an
 **    enumerated value.
 **
 *b  Returns:
 **
 **    enumeration value of string
 **
 *b  Callable From:
 **
 *-    - C++
 *-    - Script
 */

BDI_DECLSPEC_bdiutil diguyTextureMapType diguy_texture_type_from_string(const char* string);

/****************************************************************************/
class BDI_DECLSPEC_diguy diguyGraphicsTexture
{

public:

/*****************************************************************************/
        /*l
         *b  Description:
         **
         **    Returns the name of the texture.  This pointer will
         **    never be NULL.
         **
         *b  Returns:
         **
         **    name of the texture
         */
        const char* get_name();

        /*l
         *b  Description:
         **
         **    This function returns the filename of the texture.  This pointer
         **    may be NULL if the texture does not have an associated filename.
         **
         *b  Returns:
         **
         **    filename of the texture
         */
        const char* get_filename();

        /*l
         *b  Returns:
         **
         **    the width of the texture, in pixels; -1 on failure
         */
        int get_width();

        /*l
         *b  Returns:
         **
         **    the height of the texture, in pixels; -1 on failure
         */
        int get_height();

        /*l
         *b  Description:
         **
         **    This function returns how many components the texture has.  The
         **    number of components will be an integer between 1 and 4.
         **
         **    Most textures have three components, red (R), green (G), and
         **    blue (B), or RGB.  These textures commonly have filenames with
         **    the extension .rgb.
         **
         **    Four component textures add an alpha (A) channel, resulting in
         **    RGBA.  These textures commonly have filenames with the extension
         **    .rgba.
         **
         **    One component textures have only an intensity (I).  These textures
         **    commonly have filenames with the extension .int.
         **
         **    Two component textures have only an intensity (I), and an alpha
         **    channel.  These textures commonly have filenames with the
         **    extension .inta.
         **
         *b  Returns:
         **
         **    number of components in texture; -1 on failure
         */
        int get_num_components();

        /*l
         *b  Description:
         **
         **    This function returns whether the texture contains an alpha
         **    component.  Textures that have an alpha component can make
         **    objects semi-transparent, which can affect when said objects
         **    should be drawn.
         **
         *b  Returns:
         **
         **    1 if texture contains an alpha component, 0 if not; -1 on failure
         */
        int get_contains_alpha_component();

#ifdef CPLUSPLUS_ONLY

        /*l
         *b  Description:
         **
         **    This function returns a memory buffer with the actual texture
         **    data.
         **
         **    The size of buffer can be obtained by calling
         **    get_texture_map_data_size().
         **
         **    The texture information is packed into the buffer row by row,
         **    in the following order:
         **
         *-      - I    (intensity) for one component textures
         *-      - IA   (intensity and alpha) for two component textures
         *-      - RGB  (red, blue, green) for three component textures
         *-      - RGBA (red, blue, green, alpha) for four component textures
         **
         **    There is one byte per component.
         **
         **    This function should not be called after free_loader_memory()
         **    has been called.
         **
         **    Note that some renderers expect to take ownership of the texture
         **    data that is passed to them.  In this case, a copy of this texture
         **    data must be made to avoid a double deletion of the memory.  This
         **    texture data will be deleted by the call to free_loader_memory(),
         **    or when this object is deleted.
         **
         *b  Returns:
         **
         **    pointer to texture map data
         **
         **    NOTE: The returned pointer may be NULL, if there was some problem
         **    loading the texture file.
         **
         *b  Callable From:
         **
         *-    - C++
         */
        unsigned char* get_texture_map_data();

#endif

        /*l
         *b  Description:
         **
         **    This function returns how many bytes are used by the texture
         **    map data buffer.
         **
         *b  Returns:
         **
         **    buffer size of texture map data, in bytes; may be 0 in the
         **    case of a NULL texture
         */
        int get_texture_map_data_size();

        /*l
         *b  Description:
         **
         **    This function returns which compression method, if any, is
         **    applied to the data returned bu get_texture_map_data().
         **
         **    Most often compressed textures come from .dds (DirectDraw Surface)
         **    files.
         **
         *b  Returns:
         **
         **    compression type enumeration
         */
        diguyGraphicsTextureCompressionType get_texture_compression_type();

        /*l
         *b  Description:
         **
         **    This function returns how many mipmaps are already included in
         **    the texture map data.
         **
         **    Typically only .dds (DirectDraw Surface) textures have precomputed
         **    mipmaps in them.
         **
         **    Note that values 0 and 1 are somewhat the same: there is only
         **    one image in the texture map data: the base, unscaled image.
         **
         *b  Returns:
         **
         **    num of included mipmaps
         */
        int get_num_included_mipmaps();

        /*l
         *b  Description:
         **
         **    This function returns the size of the data, in bytes, of the
         **    specified mipmap.
         **
         **    "mipmap" 0 is the base, unscaled image, mipmap 1 is the first
         **    scaled image, etc.
         **
         *b  Returns:
         **
         **    data size, in bytes, of mipmap; -1 on error
         */
        int get_mipmap_data_size(int mipmap);

        /*l
         *b  Description:
         **
         **    This function returns the data offset of the specified mipmap
         **    into the data pointer returned by get_texture_map_data().
         **
         **    "mipmap" 0 is the base, unscaled image, mipmap 1 is the first
         **    scaled image, etc.
         **
         *b  Returns:
         **
         **    data offset, in bytes, of mipmap; -1 on error
         */
        int get_mipmap_data_offset(int mipmap);

        /*l
         *b  Description:
         **
         **    This function returns the OpenGL pixel format enumeration of this
         **    texture.
         **
         **    This enumeration will be one of the following:
         **
         *-    - GL_LUMINANCE
         *-    - GL_LUMINANCE_ALPHA
         *-    - GL_RGB
         *-    - GL_RGBA
         *-    - GL_COMPRESSED_RGB_S3TC_DXT1_EXT
         *-    - GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
         *-    - GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
        .*     - GL_COMPRESSED_RGB_ALPHA_S3TC_DXT1_EXT
        .*     - GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT
         **
         *b  Returns:
         **
         **    OpenGL pixel format enum; -1 on error
         **
         **    In OpenGL and OSG environments, the returned value should be cast
         **    into a GLenum.
         */
        int get_gl_format();

        /*l
         *b  Description:
         **
         **    This function returns the OpenGL pixel format string of this
         **    texture.  There are a large number of potential results depending
         **    if compressed textures and/or sRGB textures are enabled.
         **
         **    Example of possible results:
         **
         *-    - GL_RGB GL_RGBA
         *-    - sRGB: GL_SRGB GL_SRGB_ALPHA
         *-    - Compressed: GL_COMPRESSED_RGB_S3TC_DXT1 GL_COMPRESSED_RGBA_S3TC_DXT5
         *-    - sRGB + Compressed: GL_COMPRESSED_RGB_ALPHA_S3TC_DXT1 GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5
         */
        const char* get_gl_format_as_string();

        /*l
         *b  Description:
         **
         **    This function returns the "block size" of the dds compression
         **    types.  This value can be useful in generating mipmap data offsets.
         **
         **    Alternatively, the function get_mipmap_data_offset() can be called
         **    to get the precomputed mipmap data offsets.
         **
         **    Currently this value will be either 8 (for DXT1 compression) or 16
         **    (for DXT3 and DXT5 compression).
         **
         *b  Returns:
         **
         **    block size, in bytes
         */
        int get_dds_block_size();

        /*l
         *b  Description:
         **
         **    For texture indices less than zero and greater than one, a decision
         **    must be made as to whether the texture is repeated or whether the
         **    edge pixels are replicated to fill the space.
         **
         **    This function returns whether the texture should be repeated
         **    horizontally (don't clamp) or whether the edge column of pixels
         **    should be used (do clamp).
         **
         **    Note that in MultiGen Creator attribute (.attr) files, this
         **    corresponds to the "Wrap Method u" attribute.
         **
         *b  Returns:
         **
         **    0 is texture should be tiled, 1 if not; -1 on failure
         */
        int get_clamp_s();

        /*l
         *b  Description:
         **
         **    For texture indices less than zero and greater than one, a
         **    decision must be made as to whether the texture is repeated
         **    or whether the edge pixels are replicated to fill the space.
         **
         **    This function returns whether the texture should be repeated
         **    vertically (don't clamp) or whether the edge row of pixels
         **    should be used (do clamp).
         **
         **    Note that in MultiGen Creator attribute (.attr) files, this
         **    corresponds to the "Wrap Method v" attribute.
         **
         *b  Returns:
         **
         **    0 is texture should be repeated, 1 if not; -1 on failure
         */
        int get_clamp_t();

        /*l
         *b  Description:
         **
         **    This function frees most memory allocated by the DI-Guy geometry
         **    loader for this object.
         **
         **    This function should only be called during or after the object's
         **    build() function has been called.  After it has been called, calls
         **    to many accessor functions will fail.
         */
        void free_loader_memory();


/*****************************************************************************/
#ifdef CPLUSPLUS_ONLY

        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy when it is time for a
         **    renderer-specific texture object to be created.  At that point
         **    the texture information has been read from the texture file,
         **    and is available via the Accessor Functions above.
         **
         *i  Immediate Mode:
         **
         **    Immediate mode renderers may override this function, to
         **    create an object that may be invoked by bind_now().
         **
         *i  Scene Graph:
         **
         **    Scene graph renderers usually do override this function, to
         **    create an object that gets associated with diguyGraphicsMesh
         **    objects.
         **
         *b  Callable From:
         **
         *-    - N/A (automatically called by DI-Guy Graphics API during
         *-      the Build Stage)
         */
        virtual void build();

        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy when it is time for a
         **    renderer-specific texture object to be destroyed.
         **
         *i  Immediate Mode:
         **
         **    Immediate mode renderers may override this function, to
         **    destroy any object that may have been created by build().
         **
         *i  Scene Graph:
         **
         **    Scene graph renderers usually do override this function, to
         **    destroy any object that may have been created by build().
         **
         *b  Callable From:
         **
         *-    - N/A (automatically called by DI-Guy Graphics API during
         *-      the Unbuild Stage)
         */
        virtual void unbuild();

        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy when the texture should
         **    be made active, or bound.
         **
         *i  Immediate Mode:
         **
         **    Immediate mode renderers usually do override this function, to
         **    invoke the object created by build(), or make calls to the
         **    renderer to set appropriate texture state.
         **
         *i  Scene Graph:
         **
         **    Scene graph renderers usually do not override this function.
         **
         *b  Callable From:
         **
         *-    - N/A (automatically called by DI-Guy Graphics API during
         *-      Draw Stage)
         */
        virtual void bind_now(diguyTextureMapType texture_type);

        /*l
         *b  Description:
         **
         **    This function returns the last bound texture used by DI-Guy.  This
         **    value can be used in diguyGraphicsTexture::bind() to check to see
         **    if a texture rebind is necessary; avoiding a texture rebind can
         **    avoid a significant performance hit in some rendering systems.
         **
         *b  Callable From:
         **
         *-    - C++
         */
        static diguyGraphicsTexture* get_last_bound_texture(int texture_unit = 0);

        /*l
         *b  Description:
         **
         **    This function clears out the last bound texture variable.
         **    diguyScenario::draw() automatically calls it, but it is also
         **    recommended that it be called before drawing individual
         **    diguyCharacters in case something outside of DI-Guy has changed
         **    the texture.
         **
         *b  Callable From:
         **
         *-    - C++
         */
        static void clear_last_bound_texture();

#endif


/****************************************************************************/
/****************************************************************************/

#ifdef CPLUSPLUS_ONLY

        bdiGeometryTextureFile* get_scripted_object() {return m_scripted_object;}

protected:

        /*l
         **    A protected constructor.  Constructors are called automatically
         **    by DI-Guy.
         */
        diguyGraphicsTexture(void* internal_data);

        /*l
         **    A protected destructor.  Destructors are called automatically
         **    by DI-Guy.
         */
        virtual ~diguyGraphicsTexture();

private:

        /*l
         **    A pointer to internal data.
         */
        bdiGeometryTextureFile* m_scripted_object;

        friend class bdiGeometryTextureFile;
        friend class bdiGeometryFactory;

#endif

};


#endif /* __diguyGraphicsTexture_H */