ascension: src/ascension/datatypes.h@c5dde81b6fb2 (annotated)

src/ascension/datatypes.h@c5dde81b6fb2 (annotated)

src/ascension/datatypes.h

Wed, 15 Nov 2023 22:51:40 +0100

author: Mike Becker <universe@uap-core.de>
date: Wed, 15 Nov 2023 22:51:40 +0100
changeset 16: c5dde81b6fb2
parent 14: 9dbfc0031887
child 19: d0e88022e209
permissions: -rw-r--r--

add text rendering and demo FPS counter

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  * Copyright 2023 Mike Becker. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *   1. Redistributions of source code must retain the above copyright
  *      notice, this list of conditions and the following disclaimer.
  *
  *   2. Redistributions in binary form must reproduce the above copyright
  *      notice, this list of conditions and the following disclaimer in the
  *      documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
 #ifndef ASCENSION_DATATYPES_H
 #define ASCENSION_DATATYPES_H
 #ifdef __cplusplus
 #error You cannot ascend using C++
 #endif
 #include <stdbool.h>
 #include <string.h>
 // --------------------------------------------------------------------------
 //    Datatype Definitions
 // --------------------------------------------------------------------------
 typedef unsigned char asc_ubyte;
 typedef signed char asc_sbyte;
 typedef union asc_vec2i {
     int data[2];
     struct { int x, y; };
     struct { int width, height; };
 } asc_vec2i;
 typedef struct asc_col4i {
     asc_ubyte red, green, blue, alpha;
 } asc_col4i;
 typedef struct asc_col4f {
     float red, green, blue, alpha;
 } asc_col4f;
 typedef float asc_mat4f[16];
 // --------------------------------------------------------------------------
 //    General Utility Functions
 // --------------------------------------------------------------------------
 static inline int asc_clamp_i(int v, int min, int max) {
     if (v < min) return min;
     if (v > max) return max;
     return v;
 }
 /**
  * Converts a float color (0.0f to 1.0f) to an int color (0 to 255).
  *
  * This operation is quite expensive. When you need to use it often, it's
  * quite obvious that you should change the data type.
  *
  * @param c the color using floats
  * @return the same color using ints
  */
 static inline asc_col4i asc_col_ftoi(asc_col4f c) {
     int red = (int)(255*c.red);
     int green = (int)(255*c.green);
     int blue = (int)(255*c.blue);
     int alpha = (int)(255*c.alpha);
     asc_col4i r;
     r.red = (asc_ubyte)asc_clamp_i(red, 0, 255);
     r.green = (asc_ubyte)asc_clamp_i(green, 0, 255);
     r.blue = (asc_ubyte)asc_clamp_i(blue, 0, 255);
     r.alpha = (asc_ubyte)asc_clamp_i(alpha, 0, 255);
     return r;
 }
 // --------------------------------------------------------------------------
 //   Matrix Functions
 // --------------------------------------------------------------------------
 /**
  * Computes a matrix index in column-major order.
  * @param col the column
  * @param row the row
  * @param rows the number of rows
  */
 #define asc_mat_index(col, row, rows) ((row) + (col) * (rows))
 /**
  * Computes a 4x4 matrix index in column-major order.
  * @param col the column
  * @param row the row
  */
 #define asc_mat4_index(col, row) asc_mat_index(col, row, 4)
 static inline void asc_mat4f_ortho(
         asc_mat4f mat,
         float left,
         float right,
         float bottom,
         float top
 ) {
     memset(mat, 0, sizeof(float) * 16);
     mat[asc_mat4_index(0,0)] = 2.f / (right - left);
     mat[asc_mat4_index(1,1)] = 2.f / (top - bottom);
     mat[asc_mat4_index(2,2)] = -1;
     mat[asc_mat4_index(3,0)] = -(right + left) / (right - left);
     mat[asc_mat4_index(3,1)] = -(top + bottom) / (top - bottom);
     mat[asc_mat4_index(3,3)] = 1;
 }
 #endif //ASCENSION_DATATYPES_H

Mercurial > hg > ascension / annotate

src/ascension/datatypes.h@c5dde81b6fb2 (annotated)

src/ascension/datatypes.h