math.c File Reference

Converting mathematical structures from Allegro to OpenGL. More...

#include <math.h>
#include <allegro.h>
#include "alleggl.h"
#include "allglint.h"

Go to the source code of this file.

Defines

• #define M_PI   3.14159265358979323846
• #define ALGL_NOCONV(x)   x
• #define TRANSLATE_AL_TO_GL(al_type, gl_type, convertor)
• #define TRANSLATE_GL_TO_AL(gl_type, al_type, convertor)
• #define RAD_2_DEG(a)   ((a) * 180 / M_PI)

Functions

Matrix conversion routines

• void allegro_gl_MATRIX_to_GLfloat (MATRIX *m, GLfloat gl[16])

  Converts an Allegro fixed-point matrix to an array of floats suitable for OpenGL's matrix operations.
  

• void allegro_gl_MATRIX_to_GLdouble (MATRIX *m, GLdouble gl[16])

  Converts an Allegro fixed-point matrix to an array of doubles suitable for OpenGL's matrix operations.
  

• void allegro_gl_MATRIX_f_to_GLfloat (MATRIX_f *m, GLfloat gl[16])

  Converts an Allegro floating-point matrix to an array of floats suitable for OpenGL's matrix operations.
  

• void allegro_gl_MATRIX_f_to_GLdouble (MATRIX_f *m, GLdouble gl[16])

  Converts an Allegro floating-point matrix to an array of doubles suitable for OpenGL's matrix operations.
  

• void allegro_gl_GLfloat_to_MATRIX (GLfloat gl[16], MATRIX *m)

  Converts an OpenGL floating-point matrix issued from the matrix stack to an Allegro fixed-point matrix.
  

• void allegro_gl_GLdouble_to_MATRIX (GLdouble gl[16], MATRIX *m)

  Converts an OpenGL double precision floating-point matrix issued from the matrix stack to an Allegro fixed-point matrix.
  

• void allegro_gl_GLfloat_to_MATRIX_f (GLfloat gl[16], MATRIX_f *m)

  Converts an OpenGL floating-point matrix issued from the matrix stack to an Allegro floating-point matrix.
  

• void allegro_gl_GLdouble_to_MATRIX_f (GLdouble gl[16], MATRIX_f *m)

  Converts an OpenGL double precision floating-point matrix issued from the matrix stack to an Allegro single-precision floating-point matrix.
  

Quaternion conversion routines

• void allegro_gl_apply_quat (QUAT *q)

  Multiplies the Quaternion to the current transformation matrix, by converting it to a call to glRotatef().
  

• void allegro_gl_quat_to_glrotatef (QUAT *q, float *angle, float *x, float *y, float *z)

  Converts a quaternion to a vector/angle, which can be used with glRotate*().
  

• void allegro_gl_quat_to_glrotated (QUAT *q, double *angle, double *x, double *y, double *z)

  Converts a quaternion to a vector/angle, which can be used with glRotate*().
  

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Detailed Description

Converting mathematical structures from Allegro to OpenGL.

This file provides routines to make Allegro matrices from GL-style matrices, and vice versa. This also provides a QUAT to glRotate converter.

Note that Allegro matrices can only store affine transformations.

Definition in file math.c.

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Define Documentation

#define TRANSLATE_AL_TO_GL	(	al_type,
		gl_type,
		convertor		)

Value:

void allegro_gl_##al_type##_to_##gl_type (al_type *m, gl_type gl[16]) \
    { \
        int col, row; \
        for (col = 0; col < 3; col++) \
            for (row = 0; row < 3; row++) \
                gl[col*4+row] = convertor (m->v[col][row]); \
        for (row = 0; row < 3; row++) \
            gl[12+row] = convertor (m->t[row]); \
        for (col = 0; col < 3; col++) \
            gl[4*col + 3] = 0; \
        gl[15] = 1; \
    }

Definition at line 28 of file math.c.

#define TRANSLATE_GL_TO_AL	(	gl_type,
		al_type,
		convertor		)

Value:

void allegro_gl_##gl_type##_to_##al_type (gl_type gl[16], al_type *m) \
    { \
        int col, row; \
        for (col = 0; col < 3; col++) \
            for (row = 0; row < 3; row++) \
                m->v[col][row] = convertor (gl[col*4+row]); \
        for (row = 0; row < 3; row++) \
            m->t[row] = convertor (gl[12+row]); \
    }

Definition at line 118 of file math.c.

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