ascension: src/ascension/datatypes.h@302971e8599b

     1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

     3  * Copyright 2023 Mike Becker. All rights reserved.

     4  *

     5  * Redistribution and use in source and binary forms, with or without

     6  * modification, are permitted provided that the following conditions are met:

     7  *

     8  *   1. Redistributions of source code must retain the above copyright

     9  *      notice, this list of conditions and the following disclaimer.

    10  *

    11  *   2. Redistributions in binary form must reproduce the above copyright

    12  *      notice, this list of conditions and the following disclaimer in the

    13  *      documentation and/or other materials provided with the distribution.

    14  *

    15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

    16  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    18  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

    19  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    20  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    21  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    22  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

    25  * POSSIBILITY OF SUCH DAMAGE.

    26  */

    28 #ifndef ASCENSION_DATATYPES_H

    29 #define ASCENSION_DATATYPES_H

    31 #include <stdbool.h>

    32 #include <SDL2/SDL_endian.h>

    34 #ifdef __cplusplus

    35 extern "C" {

    36 #endif

    38 typedef unsigned char asc_ubyte;

    39 typedef signed char asc_sbyte;

    41 typedef union asc_vec2i {

    42     int data[2];

    43     struct { int x, y; };

    44     struct { int width, height; };

    45 } asc_vec2i;

    47 typedef union asc_col4i {

    48     asc_ubyte data[4];

    49 #if SDL_BYTEORDER == SDL_BIG_ENDIAN

    50     struct { asc_ubyte red, green, blue, alpha; };

    51 #else

    52     struct { asc_ubyte alpha, blue, green, red; };

    53 #endif

    54 } asc_col4i;

    56 typedef union asc_col4f {

    57     float data[4];

    58 #if SDL_BYTEORDER == SDL_BIG_ENDIAN

    59     struct { float red, green, blue, alpha; };

    60 #else

    61     struct { float alpha, blue, green, red; };

    62 #endif

    63 } asc_col4f;

    65 static inline int asc_clamp_i(int v, int min, int max) {

    66     if (v < min) return min;

    67     if (v > max) return max;

    68     return v;

    69 }

    71 /**

    72  * Converts a float color (0.0f to 1.0f) to an int color (0 to 255).

    73  *

    74  * This operation is quite expensive. When you need to use it often, it's

    75  * quite obvious that you should change the data type.

    76  *

    77  * @param c the color using floats

    78  * @return the same color using ints

    79  */

    80 static inline asc_col4i asc_col_ftoi(asc_col4f c) {

    81     int red = (int)(255*c.red);

    82     int green = (int)(255*c.green);

    83     int blue = (int)(255*c.blue);

    84     int alpha = (int)(255*c.alpha);

    85     asc_col4i r;

    86     r.red = (asc_ubyte)asc_clamp_i(red, 0, 255);

    87     r.green = (asc_ubyte)asc_clamp_i(green, 0, 255);

    88     r.blue = (asc_ubyte)asc_clamp_i(blue, 0, 255);

    89     r.alpha = (asc_ubyte)asc_clamp_i(alpha, 0, 255);

    90     return r;

    91 }

    93 #ifdef __cplusplus

    94 } // extern "C"

    95 #endif

    97 #endif //ASCENSION_DATATYPES_H

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