/* qbism.h
 *
 * Andy Goth <unununium@openverse.com>
 *
 * Derived from, and hopefully compatible with, GIMP's gqbist.c, originally by
 * Jens Ch. Restemeier <jrestemeier@currantbun.com>.  gqbist.c is available
 * under the GPL (GNU General Public License), version 2 or later.  Therefore,
 * the file is also available under the GPL.  And there was much rejoicing. */

#include <stdio.h>

/* All suppoted transformation operations. */
typedef enum {
    XOP_PROJECTION,
    XOP_SHIFT,
    XOP_SHIFTBACK,
    XOP_ROTATE,
    XOP_ROTATE2,
    XOP_MULTIPLY,
    XOP_SINE,
    XOP_CONDITIONAL,
    XOP_COMPLEMENT,
    XOP_COUNT
} xform_op_t;

/* A single transformation instruction. */
typedef struct {
    xform_op_t opcode;          /* Operation to perform.                    */
    int source;                 /* Index of the source register.            */
    int control;                /* Index of the control register.           */
    int dest;                   /* Index of the destination register.       */
} xform_t;

/* A sequence of transformation instructions. */
typedef struct {
    xform_t* seq;               /* The sequence of instructions.            */
    int num_steps;              /* Number of instructions in the sequence.  */
    int num_regs;               /* Number of registers needed.              */
} algo_t;

/* A register.  Consists of red, green, and blue channels. */
typedef float reg_t[3];

void* xmalloc(size_t bytes);
void* xrealloc(void* buf, size_t bytes);
void  algo_read_qbe(algo_t* algo, FILE* in);
void  algo_write_qbe(algo_t* algo, FILE* out);
void  qbism_render(algo_t* algo, int width, int height, FILE* out);

/* vim: set ts=4 sts=4 sw=4 tw=80 et: */