ascension: src/ascension/datatypes.h@e7ddb52facd3

add behavior nodes + restructure test program

Also, the test program will now officially be a game of snake.

     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 #ifdef __cplusplus

    32 #error You cannot ascend using C++

    33 #endif

    35 #include <stdbool.h>

    36 #include <string.h>

    37 #include <SDL2/SDL_pixels.h>

    39 // --------------------------------------------------------------------------

    40 //    Datatype Definitions

    41 // --------------------------------------------------------------------------

    43 typedef unsigned char asc_ubyte;

    44 typedef signed char asc_sbyte;

    46 typedef union asc_vec2i {

    47     int data[2];

    48     struct { int x, y; };

    49     struct { int width, height; };

    50 } asc_vec2i;

    52 typedef struct asc_col4i {

    53     asc_ubyte red, green, blue, alpha;

    54 } asc_col4i;

    56 typedef struct asc_col4f {

    57     float red, green, blue, alpha;

    58 } asc_col4f;

    60 typedef float asc_mat4f[16];

    62 // --------------------------------------------------------------------------

    63 //    General Utility Functions

    64 // --------------------------------------------------------------------------

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

    67     if (v < min) return min;

    68     if (v > max) return max;

    69     return v;

    70 }

    72 /**

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

    74  *

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

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

    77  *

    78  * @param c the color using floats

    79  * @return the same color using ints

    80  */

    81 static inline asc_col4i asc_col_ftoi(asc_col4f c) {

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

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

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

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

    86     asc_col4i r;

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

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

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

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

    91     return r;

    92 }

    94 static inline SDL_Color asc_col_sdl(asc_col4i col) {

    95     return (SDL_Color) {.r = col.red, .g = col.green, .b = col.blue, .a = col.alpha};

    96 }

    98 // --------------------------------------------------------------------------

    99 //   Matrix Functions

   100 // --------------------------------------------------------------------------

   102 /**

   103  * Computes a matrix index in column-major order.

   104  * @param col the column

   105  * @param row the row

   106  * @param rows the number of rows

   107  */

   108 #define asc_mat_index(col, row, rows) ((row) + (col) * (rows))

   110 /**

   111  * Computes a 4x4 matrix index in column-major order.

   112  * @param col the column

   113  * @param row the row

   114  */

   115 #define asc_mat4_index(col, row) asc_mat_index(col, row, 4)

   117 static inline void asc_mat4f_ortho(

   118         asc_mat4f mat,

   119         float left,

   120         float right,

   121         float bottom,

   122         float top

   123 ) {

   124     memset(mat, 0, sizeof(float) * 16);

   125     mat[asc_mat4_index(0,0)] = 2.f / (right - left);

   126     mat[asc_mat4_index(1,1)] = 2.f / (top - bottom);

   127     mat[asc_mat4_index(2,2)] = -1;

   128     mat[asc_mat4_index(3,0)] = -(right + left) / (right - left);

   129     mat[asc_mat4_index(3,1)] = -(top + bottom) / (top - bottom);

   130     mat[asc_mat4_index(3,3)] = 1;

   131 }

   133 #endif //ASCENSION_DATATYPES_H

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