Section 3: library functions
drem, dremf, dreml, remainder, remainderf, remainderl – floating-point remainder function Synopsis#include <math.h> /* The C99 versions */ double remainder(double x, double y); float remainderf(float x, float y); long double remainderl(long double x, long double y); /* Obsolete synonyms */ double drem(double x, double y); float dremf(float x, float y); long double dreml(long double x, long…
drawing_mode – Sets the graphics drawing mode. Allegro game programming library. Synopsis#include <allegro.h> void drawing_mode(int mode, BITMAP *pattern, int x_anchor, int y_anchor); DescriptionSets the graphics drawing mode. This only affects the geometric routines like putpixel, lines, rectangles, circles, polygons, floodfill, etc, not the text output, blitting, or sprite drawing functions. The mode should be one…
draw_trans_sprite – Draws a sprite blending it with the destination. Allegro game programming library. Synopsis#include <allegro.h> void draw_trans_sprite(BITMAP *bmp, BITMAP *sprite, int x, int y); DescriptionUses the global color_map table or truecolor blender functions to overlay the sprite on top of the existing image. This must only be used after you have set up the…
draw_trans_rle_sprite – Draws a translucent RLE sprite. Allegro game programming library. Synopsis#include <allegro.h> void draw_trans_rle_sprite(BITMAP *bmp, const RLE_SPRITE *sprite, int x, int y); DescriptionTranslucent version of draw_rle_sprite(). See the description of draw_trans_sprite(). This must only be used after you have set up the color mapping table (for 256-color modes) or blender functions (for truecolor modes)….
draw_sprite_v_flip, draw_sprite_h_flip, draw_sprite_vh_flip – Draws the sprite transformed to the destination bitmap. Allegro game programming library. Synopsis#include <allegro.h> void draw_sprite_v_flip(BITMAP *bmp, BITMAP *sprite, int x, int y); void draw_sprite_h_flip(BITMAP *bmp, BITMAP *sprite, int x, int y); void draw_sprite_vh_flip(BITMAP *bmp, BITMAP *sprite, int x, int y); DescriptionThese are like draw_sprite(), but they additionally flip the image…
draw_sprite_v_flip, draw_sprite_h_flip, draw_sprite_vh_flip – Draws the sprite transformed to the destination bitmap. Allegro game programming library. Synopsis#include <allegro.h> void draw_sprite_v_flip(BITMAP *bmp, BITMAP *sprite, int x, int y); void draw_sprite_h_flip(BITMAP *bmp, BITMAP *sprite, int x, int y); void draw_sprite_vh_flip(BITMAP *bmp, BITMAP *sprite, int x, int y); DescriptionThese are like draw_sprite(), but they additionally flip the image…
draw_sprite_v_flip, draw_sprite_h_flip, draw_sprite_vh_flip – Draws the sprite transformed to the destination bitmap. Allegro game programming library. Synopsis#include <allegro.h> void draw_sprite_v_flip(BITMAP *bmp, BITMAP *sprite, int x, int y); void draw_sprite_h_flip(BITMAP *bmp, BITMAP *sprite, int x, int y); void draw_sprite_vh_flip(BITMAP *bmp, BITMAP *sprite, int x, int y); DescriptionThese are like draw_sprite(), but they additionally flip the image…
draw_sprite – Draws a copy of the sprite onto the destination bitmap. Allegro game programming library. Synopsis#include <allegro.h> void draw_sprite(BITMAP *bmp, BITMAP *sprite, int x, int y); DescriptionDraws a copy of the sprite bitmap onto the destination bitmap at the specified position. This is almost the same as blit(sprite, bmp, 0, 0, x, y, sprite->w,…
draw_rle_sprite – Draws an RLE sprite. Allegro game programming library. Synopsis#include <allegro.h> void draw_rle_sprite(BITMAP *bmp, const RLE_SPRITE *sprite, int x, int y); DescriptionDraws an RLE sprite onto a bitmap at the specified position. Example: RLE_SPRITE *rle_sprite; … draw_rle_sprite(screen, rle_sprite, 100, 100);See Alsoget_rle_sprite(3), draw_sprite(3), draw_compiled_sprite(3), draw_trans_rle_sprite(3), draw_lit_rle_sprite(3), bitmap_mask_color(3)
draw_lit_sprite – Draws a sprite tinted with a specific color. Allegro game programming library. Synopsis#include <allegro.h> void draw_lit_sprite(BITMAP *bmp, BITMAP *sprite, int x, int y, int color); DescriptionIn 256-color modes, uses the global color_map table to tint the sprite image to the specified color or to light it to the level specified by (create_trans_table or…
draw_lit_rle_sprite – Draws a tinted RLE sprite. Allegro game programming library. Synopsis#include <allegro.h> void draw_lit_rle_sprite(BITMAP *bmp, const RLE_SPRITE *sprite, int x, y, color); DescriptionTinted version of draw_rle_sprite(). See the description of draw_lit_sprite(). This must only be used after you have set up the color mapping table (for 256-color modes) or blender functions (for truecolor modes)….
draw_gouraud_sprite – Draws a sprite with gouraud shading. Allegro game programming library. Synopsis#include <allegro.h> void draw_gouraud_sprite(BITMAP *bmp, BITMAP *sprite, int x, int y, int c1, int c2, int c3, int c4); DescriptionMore sophisticated version of draw_lit_sprite(): the ‘color’ parameter is not constant across the sprite image anymore but interpolated between the four specified corner colors….
draw_compiled_sprite – Draws a compiled sprite. Allegro game programming library. Synopsis#include <allegro.h> void draw_compiled_sprite(BITMAP *bmp, const COMPILED_SPRITE *sprite, int x, int y); DescriptionDraws a compiled sprite onto a bitmap at the specified position. The sprite must have been compiled for the correct type of bitmap (linear or planar). This function does not support clipping. Hint:…
draw_character_ex – Draws non transparent pixels of the sprite with a color. Allegro game programming library. Synopsis#include <allegro.h> void draw_character_ex(BITMAP *bmp, BITMAP *sprite, int x, int y, color, bg); DescriptionDraws a copy of the sprite bitmap onto the destination bitmap at the specified position, drawing transparent pixels in the background color (or skipping them if…
drand48_r, erand48_r, lrand48_r, nrand48_r, mrand48_r, jrand48_r, srand48_r, seed48_r, lcong48_r – generate uniformly distributed pseudo-random numbers reentrantly Synopsis#include <stdlib.h> int drand48_r(struct drand48_data *buffer, double *result); int erand48_r(unsigned short xsubi[3], struct drand48_data *buffer, double *result); int lrand48_r(struct drand48_data *buffer, long *result); int nrand48_r(unsigned short xsubi[3], struct drand48_data *buffer, long *result); int mrand48_r(struct drand48_data *buffer,long *result); int jrand48_r(unsigned…
drand48, erand48, lrand48, nrand48, mrand48, jrand48, srand48, seed48, lcong48 – generate uniformly distributed pseudo-random numbers Synopsis#include <stdlib.h> double drand48(void); double erand48(unsigned short xsubi[3]); long lrand48(void); long nrand48(unsigned short xsubi[3]); long mrand48(void); long jrand48(unsigned short xsubi[3]); void srand48(long seedval); unsigned short *seed48(unsigned short seed16v[3]); void lcong48(unsigned short param[7]);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): All…
dptts2.f – SynopsisFunctions/Subroutinessubroutine dptts2 (N, NRHS, D, E, B, LDB) DPTTS2 solves a tridiagonal system of the form AX=B using the L D LH factorization computed by spttrf. Function/Subroutine Documentationsubroutine dptts2 (integerN, integerNRHS, double precision, dimension( * )D, double precision, dimension( * )E, double precision, dimension( ldb, * )B, integerLDB)DPTTS2 solves a tridiagonal system of…
dpttrs.f – SynopsisFunctions/Subroutinessubroutine dpttrs (N, NRHS, D, E, B, LDB, INFO) DPTTRS Function/Subroutine Documentationsubroutine dpttrs (integerN, integerNRHS, double precision, dimension( * )D, double precision, dimension( * )E, double precision, dimension( ldb, * )B, integerLDB, integerINFO)DPTTRS Purpose: DPTTRS solves a tridiagonal system of the form A * X = B using the L*D*L**T factorization of A…
dpttrs.f – SynopsisFunctions/Subroutinessubroutine dpttrs (N, NRHS, D, E, B, LDB, INFO) DPTTRS Function/Subroutine Documentationsubroutine dpttrs (integerN, integerNRHS, double precision, dimension( * )D, double precision, dimension( * )E, double precision, dimension( ldb, * )B, integerLDB, integerINFO)DPTTRS Purpose: DPTTRS solves a tridiagonal system of the form A * X = B using the L*D*L**T factorization of A…
dpttrf.f – SynopsisFunctions/Subroutinessubroutine dpttrf (N, D, E, INFO) DPTTRF Function/Subroutine Documentationsubroutine dpttrf (integerN, double precision, dimension( * )D, double precision, dimension( * )E, integerINFO)DPTTRF Purpose: DPTTRF computes the L*D*L**T factorization of a real symmetric positive definite tridiagonal matrix A. The factorization may also be regarded as having the form A = U**T*D*U. Parameters: N N…