eval.c
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上传日期:2020-07-06
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文件大小:18k
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midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * eval.c:
- *****************************************************************************
- * Copyright (C) 2004 the VideoLAN team
- * $Id: 601df084663abdf31fff64baa6311cd6dc7b7494 $
- *
- * Authors: Cyril Deguet <asmax@videolan.org>
- * code from projectM http://xmms-projectm.sourceforge.net
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- #include <stdlib.h>
- /* Evaluation Code */
- #include <stdio.h>
- #include "common.h"
- #include "fatal.h"
- #include "param_types.h"
- #include "func_types.h"
- #include "expr_types.h"
- #include "eval.h"
- #include "engine_vars.h"
- #include "builtin_funcs.h"
- #define EVAL_ERROR -1
- /* All infix operators (except '=') are prototyped here */
- infix_op_t * infix_add, * infix_minus, * infix_div, * infix_mult,
- * infix_or, * infix_and, * infix_mod, * infix_negative, * infix_positive;
- int mesh_i=-1, mesh_j=-1;
- static inline double eval_tree_expr(tree_expr_t * tree_expr);
- static inline double eval_prefun_expr(prefun_expr_t * prefun_expr);
- static inline double eval_val_expr(val_expr_t * val_expr);
- double eval_gen_expr(gen_expr_t * gen_expr) {
- double l;
- if (gen_expr == NULL)
- return 0;
- switch(gen_expr->type) {
- case VAL_T:
- return eval_val_expr(gen_expr->item);
- case PREFUN_T:
- l = eval_prefun_expr(gen_expr->item);
- //if (EVAL_DEBUG) printf("eval_gen_expr: prefix function return value: %fn", l);
- return l;
- case TREE_T:
- return eval_tree_expr(gen_expr->item);
- default:
- #ifdef EVAL_DEBUG
- printf("eval_gen_expr: general expression matched no cases!n");
- #endif
- return EVAL_ERROR;
- }
- }
- /* Evaluates functions in prefix form */
- static inline double eval_prefun_expr(prefun_expr_t * prefun_expr) {
- int i;
- /* This is slightly less than safe, since
- who knows if the passed argument is valid. For
- speed purposes we'll go with this */
- double arg_list[prefun_expr->num_args];
- #ifdef EVAL_DEBUG
- printf("fn[");
- fflush(stdout);
- #endif
- /* Evaluate each argument before calling the function itself */
- for (i = 0; i < prefun_expr->num_args; i++) {
- arg_list[i] = eval_gen_expr(prefun_expr->expr_list[i]);
- #ifdef EVAL_DEBUG
- if (i < (prefun_expr->num_args - 1))
- printf(", ");
- fflush(stdout);
- #endif
- }
- #ifdef EVAL_DEBUG
- printf("]");
- fflush(stdout);
- #endif
- /* Now we call the function, passing a list of
- doubles as its argument */
- return (prefun_expr->func_ptr)(arg_list);
- }
- /* Evaluates a value expression */
- static inline double eval_val_expr(val_expr_t * val_expr) {
- /* Shouldn't happen */
- if (val_expr == NULL)
- return EVAL_ERROR;
- /* Value is a constant, return the double value */
- if (val_expr->type == CONSTANT_TERM_T) {
- #ifdef EVAL_DEBUG
- printf("%.4f", val_expr->term.constant);
- fflush(stdout);
- #endif
- return (val_expr->term.constant);
- }
- /* Value is variable, dereference it */
- if (val_expr->type == PARAM_TERM_T) {
- switch (val_expr->term.param->type) {
- case P_TYPE_BOOL:
- #ifdef EVAL_DEBUG
- printf("(%s:%.4f)", val_expr->term.param->name, (double)(*((int*)(val_expr->term.param->engine_val))));
- fflush(stdout);
- #endif
- return (double)(*((int*)(val_expr->term.param->engine_val)));
- case P_TYPE_INT:
- #ifdef EVAL_DEBUG
- printf("(%s:%.4f)", val_expr->term.param->name, (double)(*((int*)(val_expr->term.param->engine_val))));
- fflush(stdout);
- #endif
- return (double)(*((int*)(val_expr->term.param->engine_val)));
- case P_TYPE_DOUBLE:
- #ifdef EVAL_DEBUG
- printf("(%s:%.4f)", val_expr->term.param->name, (*((double*)val_expr->term.param->engine_val)));
- fflush(stdout);
- #endif
- if (val_expr->term.param->matrix_flag | (val_expr->term.param->flags & P_FLAG_ALWAYS_MATRIX)) {
- if (mesh_j >= 0) {
- return (((double**)val_expr->term.param->matrix)[mesh_i][mesh_j]);
- }
- else {
- return (((double*)val_expr->term.param->matrix)[mesh_i]);
- }
- }
- return *((double*)(val_expr->term.param->engine_val));
- default:
- return ERROR;
- }
- }
- /* Unknown type, return failure */
- return FAILURE;
- }
- /* Evaluates an expression tree */
- static inline double eval_tree_expr(tree_expr_t * tree_expr) {
- double left_arg, right_arg;
- infix_op_t * infix_op;
- /* Shouldn't happen */
- if (tree_expr == NULL)
- return EVAL_ERROR;
- /* A leaf node, evaluate the general expression. If the expression is null as well, return zero */
- if (tree_expr->infix_op == NULL) {
- if (tree_expr->gen_expr == NULL)
- return 0;
- else
- return eval_gen_expr(tree_expr->gen_expr);
- }
- /* Otherwise, this node is an infix operator. Evaluate
- accordingly */
- infix_op = (infix_op_t*)tree_expr->infix_op;
- #ifdef EVAL_DEBUG
- printf("(");
- fflush(stdout);
- #endif
- left_arg = eval_tree_expr(tree_expr->left);
- #ifdef EVAL_DEBUG
- switch (infix_op->type) {
- case INFIX_ADD:
- printf("+");
- break;
- case INFIX_MINUS:
- printf("-");
- break;
- case INFIX_MULT:
- printf("*");
- break;
- case INFIX_MOD:
- printf("%%");
- break;
- case INFIX_OR:
- printf("|");
- break;
- case INFIX_AND:
- printf("&");
- break;
- case INFIX_DIV:
- printf("/");
- break;
- default:
- printf("?");
- }
- fflush(stdout);
- #endif
- right_arg = eval_tree_expr(tree_expr->right);
- #ifdef EVAL_DEBUG
- printf(")");
- fflush(stdout);
- #endif
- switch (infix_op->type) {
- case INFIX_ADD:
- return (left_arg + right_arg);
- case INFIX_MINUS:
- return (left_arg - right_arg);
- case INFIX_MULT:
- return (left_arg * right_arg);
- case INFIX_MOD:
- if ((int)right_arg == 0) {
- #ifdef EVAL_DEBUG
- printf("eval_tree_expr: modulo zero!n");
- #endif
- return DIV_BY_ZERO;
- }
- return ((int)left_arg % (int)right_arg);
- case INFIX_OR:
- return ((int)left_arg | (int)right_arg);
- case INFIX_AND:
- return ((int)left_arg & (int)right_arg);
- case INFIX_DIV:
- if (right_arg == 0) {
- #ifdef EVAL_DEBUG
- printf("eval_tree_expr: division by zero!n");
- #endif
- return MAX_DOUBLE_SIZE;
- }
- return (left_arg / right_arg);
- default:
- #ifdef EVAL_DEBUG
- printf("eval_tree_expr: unknown infix operator!n");
- #endif
- return ERROR;
- }
- return ERROR;
- }
- /* Converts a double value to a general expression */
- gen_expr_t * const_to_expr(double val) {
- gen_expr_t * gen_expr;
- val_expr_t * val_expr;
- term_t term;
- term.constant = val;
- if ((val_expr = new_val_expr(CONSTANT_TERM_T, term)) == NULL)
- return NULL;
- gen_expr = new_gen_expr(VAL_T, (void*)val_expr);
- if (gen_expr == NULL) {
- free_val_expr(val_expr);
- }
- return gen_expr;
- }
- /* Converts a regular parameter to an expression */
- gen_expr_t * param_to_expr(param_t * param) {
- gen_expr_t * gen_expr = NULL;
- val_expr_t * val_expr = NULL;
- term_t term;
- if (param == NULL)
- return NULL;
- /* This code is still a work in progress. We need
- to figure out if the initial condition is used for
- each per frame equation or not. I am guessing that
- it isn't, and it is thusly implemented this way */
- /* Current guess of true behavior (08/01/03) note from carm
- First try to use the per_pixel_expr (with cloning).
- If it is null however, use the engine variable instead. */
- /* 08/20/03 : Presets are now objects, as well as per pixel equations. This ends up
- making the parser handle the case where parameters are essentially per pixel equation
- substitutions */
- term.param = param;
- if ((val_expr = new_val_expr(PARAM_TERM_T, term)) == NULL)
- return NULL;
- if ((gen_expr = new_gen_expr(VAL_T, (void*)val_expr)) == NULL) {
- free_val_expr(val_expr);
- return NULL;
- }
- return gen_expr;
- }
- /* Converts a prefix function to an expression */
- gen_expr_t * prefun_to_expr(double (*func_ptr)(), gen_expr_t ** expr_list, int num_args) {
- gen_expr_t * gen_expr;
- prefun_expr_t * prefun_expr;
- /* Malloc a new prefix function expression */
- prefun_expr = (prefun_expr_t*)malloc(sizeof(prefun_expr_t));
- if (prefun_expr == NULL)
- return NULL;
- prefun_expr->num_args = num_args;
- prefun_expr->func_ptr = func_ptr;
- prefun_expr->expr_list = expr_list;
- gen_expr = new_gen_expr(PREFUN_T, (void*)prefun_expr);
- if (gen_expr == NULL)
- free_prefun_expr(prefun_expr);
- return gen_expr;
- }
- /* Creates a new tree expression */
- tree_expr_t * new_tree_expr(infix_op_t * infix_op, gen_expr_t * gen_expr, tree_expr_t * left, tree_expr_t * right) {
- tree_expr_t * tree_expr;
- tree_expr = (tree_expr_t*)malloc(sizeof(tree_expr_t));
- if (tree_expr == NULL)
- return NULL;
- tree_expr->infix_op = infix_op;
- tree_expr->gen_expr = gen_expr;
- tree_expr->left = left;
- tree_expr->right = right;
- return tree_expr;
- }
- /* Creates a new value expression */
- val_expr_t * new_val_expr(int type, term_t term) {
- val_expr_t * val_expr;
- val_expr = (val_expr_t*)malloc(sizeof(val_expr_t));
- if (val_expr == NULL)
- return NULL;
- val_expr->type = type;
- val_expr->term = term;
- return val_expr;
- }
- /* Creates a new general expression */
- gen_expr_t * new_gen_expr(int type, void * item) {
- gen_expr_t * gen_expr;
- gen_expr = (gen_expr_t*)malloc(sizeof(gen_expr_t));
- if (gen_expr == NULL)
- return NULL;
- gen_expr->type = type;
- gen_expr->item = item;
- return gen_expr;
- }
- /* Frees a general expression */
- int free_gen_expr(gen_expr_t * gen_expr) {
- if (gen_expr == NULL)
- return SUCCESS;
- switch (gen_expr->type) {
- case VAL_T:
- free_val_expr(gen_expr->item);
- break;
- case PREFUN_T:
- free_prefun_expr(gen_expr->item);
- break;
- case TREE_T:
- free_tree_expr(gen_expr->item);
- break;
- default:
- return FAILURE;
- }
- free(gen_expr);
- return SUCCESS;
- }
- /* Frees a function in prefix notation */
- int free_prefun_expr(prefun_expr_t * prefun_expr) {
- int i;
- if (prefun_expr == NULL)
- return SUCCESS;
- /* Free every element in expression list */
- for (i = 0 ; i < prefun_expr->num_args; i++) {
- free_gen_expr(prefun_expr->expr_list[i]);
- }
- free(prefun_expr);
- return SUCCESS;
- }
- /* Frees values of type VARIABLE and CONSTANT */
- int free_val_expr(val_expr_t * val_expr) {
- if (val_expr == NULL)
- return SUCCESS;
- free(val_expr);
- return SUCCESS;
- }
- /* Frees a tree expression */
- int free_tree_expr(tree_expr_t * tree_expr) {
- if (tree_expr == NULL)
- return SUCCESS;
- /* free left tree */
- free_tree_expr(tree_expr->left);
- /* free general expression object */
- free_gen_expr(tree_expr->gen_expr);
- /* Note that infix operators are always
- stored in memory unless the program
- exits, so we don't remove them here */
- /* free right tree */
- free_tree_expr(tree_expr->right);
- /* finally, free the struct itself */
- free(tree_expr);
- return SUCCESS;
- }
- /* Initializes all infix operators */
- int init_infix_ops() {
- infix_add = new_infix_op(INFIX_ADD, 4);
- infix_minus = new_infix_op(INFIX_MINUS, 3);
- infix_div = new_infix_op(INFIX_DIV, 2);
- infix_or = new_infix_op(INFIX_OR, 5);
- infix_and = new_infix_op(INFIX_AND,4);
- infix_mod = new_infix_op(INFIX_MOD, 1);
- infix_mult = new_infix_op(INFIX_MULT, 2);
- /* Prefix operators */
- infix_positive = new_infix_op(INFIX_ADD, 0);
- infix_negative = new_infix_op(INFIX_MINUS, 0);
- return SUCCESS;
- }
- /* Destroys the infix operator list. This should
- be done on program exit */
- int destroy_infix_ops()
- {
- free(infix_add);
- free(infix_minus);
- free(infix_div);
- free(infix_or);
- free(infix_and);
- free(infix_mod);
- free(infix_mult);
- free(infix_positive);
- free(infix_negative);
- return SUCCESS;
- }
- /* Initializes an infix operator */
- infix_op_t * new_infix_op(int type, int precedence) {
- infix_op_t * infix_op;
- infix_op = (infix_op_t*)malloc(sizeof(infix_op_t));
- if (infix_op == NULL)
- return NULL;
- infix_op->type = type;
- infix_op->precedence = precedence;
- return infix_op;
- }
- /* Clones a general expression */
- gen_expr_t * clone_gen_expr(gen_expr_t * gen_expr) {
- gen_expr_t * new_gen_expr;
- val_expr_t * val_expr;
- tree_expr_t * tree_expr;
- prefun_expr_t * prefun_expr;
- /* Null argument check */
- if (gen_expr == NULL)
- return NULL;
- /* Out of memory */
- if ((new_gen_expr = (gen_expr_t*)malloc(sizeof(gen_expr_t))) == NULL)
- return NULL;
- /* Case on the type of general expression */
- switch (new_gen_expr->type = gen_expr->type) {
- case VAL_T: /* val expression */
- if ((val_expr = clone_val_expr((val_expr_t*)gen_expr->item)) == NULL) {
- free(new_gen_expr);
- return NULL;
- }
- new_gen_expr->item = (void*)val_expr;
- break;
- case PREFUN_T: /* prefix function expression */
- if ((prefun_expr = clone_prefun_expr((prefun_expr_t*)gen_expr->item)) == NULL) {
- free(new_gen_expr);
- return NULL;
- }
- new_gen_expr->item = (void*)prefun_expr;
- break;
- case TREE_T: /* tree expression */
- if ((tree_expr = clone_tree_expr((tree_expr_t*)gen_expr->item)) == NULL) {
- free(new_gen_expr);
- return NULL;
- }
- new_gen_expr->item = (void*)tree_expr;
- break;
- default: /* unknown type, ut oh.. */
- free(new_gen_expr);
- return NULL;
- }
- return new_gen_expr; /* Return the new (cloned) general expression */
- }
- /* Clones a tree expression */
- tree_expr_t * clone_tree_expr(tree_expr_t * tree_expr) {
- tree_expr_t * new_tree_expr;
- /* Null argument */
- if (tree_expr == NULL)
- return NULL;
- /* Out of memory */
- if ((new_tree_expr = (tree_expr_t*)malloc(sizeof(tree_expr_t))) == NULL)
- return NULL;
- /* Set each argument in tree_expr_t struct */
- new_tree_expr->infix_op = tree_expr->infix_op; /* infix operators are in shared memory */
- new_tree_expr->gen_expr = clone_gen_expr(tree_expr->gen_expr); /* clone the general expression */
- new_tree_expr->left = clone_tree_expr(tree_expr->left); /* clone the left tree expression */
- new_tree_expr->right = clone_tree_expr(tree_expr->right); /* clone the right tree expression */
- return new_tree_expr; /* Return the new (cloned) tree expression */
- }
- /* Clones a value expression, currently only passes the pointer to
- the value that this object represents, not a pointer to a copy of the value */
- val_expr_t * clone_val_expr(val_expr_t * val_expr) {
- val_expr_t * new_val_expr;
- /* Null argument */
- if (val_expr == NULL)
- return NULL;
- /* Allocate space, check for out of memory */
- if ((new_val_expr = (val_expr_t*)malloc(sizeof(val_expr_t))) == NULL)
- return NULL;
- /* Set the values in the val_expr_t struct */
- new_val_expr->type = val_expr->type;
- new_val_expr->term = val_expr->term;
- /* Return the new (cloned) value expression */
- return new_val_expr;
- }
- /* Clones a prefix function with its arguments */
- prefun_expr_t * clone_prefun_expr(prefun_expr_t * prefun_expr) {
- int i;
- prefun_expr_t * new_prefun_expr;
- /* Null argument */
- if (prefun_expr == NULL)
- return NULL;
- /* Out of memory */
- if ((new_prefun_expr = (prefun_expr_t*)malloc(sizeof(prefun_expr_t))) == NULL)
- return NULL;
- /* Set the function argument paired with its number of arguments */
- new_prefun_expr->num_args = prefun_expr->num_args;
- new_prefun_expr->func_ptr = prefun_expr->func_ptr;
- /* Allocate space for the expression list pointers */
- if ((new_prefun_expr->expr_list = (gen_expr_t**)malloc(sizeof(gen_expr_t*)*new_prefun_expr->num_args)) == NULL) {
- free(new_prefun_expr);
- return NULL;
- }
- /* Now copy each general expression from the argument expression list */
- for (i = 0; i < new_prefun_expr->num_args;i++)
- new_prefun_expr->expr_list[i] = clone_gen_expr(prefun_expr->expr_list[i]);
- /* Finally, return the new (cloned) prefix function expression */
- return new_prefun_expr;
- }
- /* Reinitializes the engine variables to a default (conservative and sane) value */
- void reset_engine_vars() {
- zoom=1.0;
- zoomexp= 1.0;
- rot= 0.0;
- warp= 0.0;
- sx= 1.0;
- sy= 1.0;
- dx= 0.0;
- dy= 0.0;
- cx= 0.5;
- cy= 0.5;
- decay=.98;
- wave_r= 1.0;
- wave_g= 0.2;
- wave_b= 0.0;
- wave_x= 0.5;
- wave_y= 0.5;
- wave_mystery= 0.0;
- ob_size= 0.0;
- ob_r= 0.0;
- ob_g= 0.0;
- ob_b= 0.0;
- ob_a= 0.0;
- ib_size = 0.0;
- ib_r = 0.0;
- ib_g = 0.0;
- ib_b = 0.0;
- ib_a = 0.0;
- mv_a = 0.0;
- mv_r = 0.0;
- mv_g = 0.0;
- mv_b = 0.0;
- mv_l = 1.0;
- mv_x = 16.0;
- mv_y = 12.0;
- mv_dy = 0.02;
- mv_dx = 0.02;
- meshx = 0;
- meshy = 0;
- Time = 0;
- treb = 0;
- mid = 0;
- bass = 0;
- treb_att = 0;
- mid_att = 0;
- bass_att = 0;
- progress = 0;
- frame = 0;
- // bass_thresh = 0;
- /* PER_FRAME CONSTANTS END */
- fRating = 0;
- fGammaAdj = 1.0;
- fVideoEchoZoom = 1.0;
- fVideoEchoAlpha = 0;
- nVideoEchoOrientation = 0;
- nWaveMode = 7;
- bAdditiveWaves = 0;
- bWaveDots = 0;
- bWaveThick = 0;
- bModWaveAlphaByVolume = 0;
- bMaximizeWaveColor = 0;
- bTexWrap = 0;
- bDarkenCenter = 0;
- bRedBlueStereo = 0;
- bBrighten = 0;
- bDarken = 0;
- bSolarize = 0;
- bInvert = 0;
- bMotionVectorsOn = 1;
- fWaveAlpha =1.0;
- fWaveScale = 1.0;
- fWaveSmoothing = 0;
- fWaveParam = 0;
- fModWaveAlphaStart = 0;
- fModWaveAlphaEnd = 0;
- fWarpAnimSpeed = 0;
- fWarpScale = 0;
- fShader = 0;
- /* PER_PIXEL CONSTANTS BEGIN */
- x_per_pixel = 0;
- y_per_pixel = 0;
- rad_per_pixel = 0;
- ang_per_pixel = 0;
- /* PER_PIXEL CONSTANT END */
- /* Q VARIABLES START */
- q1 = 0;
- q2 = 0;
- q3 = 0;
- q4 = 0;
- q5 = 0;
- q6 = 0;
- q7 = 0;
- q8 = 0;
- /* Q VARIABLES END */
- }