mirror of
https://github.com/Fledge68/WiiFlow_Lite.git
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126 lines
2.4 KiB
C
126 lines
2.4 KiB
C
/*
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* Copyright (c) 2002, 2003, 2004, 2005, 2007 by Christian Nowak <chnowak@web.de>
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* Last update: 20th October, 2007
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*/
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#include "envelope.h"
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void EnvReset(Envelope *env) {
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if (env == NULL)
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return;
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if (env->envConfig == NULL)
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return;
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if (!env->envConfig->enabled)
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return;
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env->hold = FALSE;
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env->triggered = FALSE;
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env->position = 0;
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env->value = 0;
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env->curPoint = 0;
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if (env->envConfig->numPoints > 0) {
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env->value = env->envConfig->envPoints[0].y;
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}
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}
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void EnvTrigger(Envelope *env) {
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if (env == NULL)
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return;
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if (env->envConfig == NULL)
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return;
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if (!env->envConfig->enabled)
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return;
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EnvReset(env);
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env->triggered = TRUE;
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env->hold = TRUE;
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}
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BOOL EnvProcess(Envelope *env) {
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if (env == NULL)
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return FALSE;
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if (env->envConfig == NULL)
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return FALSE;
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if (!env->envConfig->enabled)
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return FALSE;
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if (env->envConfig->numPoints <= 1)
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return FALSE;
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if (!env->triggered)
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return FALSE;
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/* Only process if we're not at the sustain point */
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if (!(env->hold && (env->curPoint == env->envConfig->sustain))) {
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/* ... and only when we're not beyond the last env point */
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if (env->position < env->envConfig->envPoints[env->envConfig->numPoints-1].x) {
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s32 x1, y1, x2, y2, dx, dy;
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s32 relativePos;
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x1 = env->envConfig->envPoints[env->curPoint].x;
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y1 = env->envConfig->envPoints[env->curPoint].y;
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x2 = env->envConfig->envPoints[env->curPoint + 1].x;
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y2 = env->envConfig->envPoints[env->curPoint + 1].y;
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dx = x2 - x1;
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dy = y2 - y1;
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env->position++;
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relativePos = env->position - x1;
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env->value = ((dy * relativePos) / dx) + y1;
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if (env->position >= env->envConfig->envPoints[env->curPoint + 1].x) {
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env->curPoint++;
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/* Handle env loops */
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if ((env->envConfig->loop_end >= env->envConfig->loop_start) &&
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((env->envConfig->loop_end < env->envConfig->numPoints) &&
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(env->envConfig->loop_start < env->envConfig->numPoints))) {
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if (env->curPoint == env->envConfig->loop_end) {
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env->curPoint = env->envConfig->loop_start;
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env->position = env->envConfig->envPoints[env->curPoint].x;
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env->value = env->envConfig->envPoints[env->curPoint].y;
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}
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}
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}
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}
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}
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return TRUE;
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}
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void EnvRelease(Envelope *env) {
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if (env == NULL)
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return;
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if (env->envConfig == NULL)
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return;
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if (!env->envConfig->enabled)
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return;
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env->hold = FALSE;
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}
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