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/**
* @file llviewertextureanim.cpp
* @brief LLViewerTextureAnim class implementation
*
* Copyright (c) 2003-2007, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlife.com/developers/opensource/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlife.com/developers/opensource/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
*/
#include "llviewerprecompiledheaders.h"
#include "llviewertextureanim.h"
#include "llmath.h"
#include "llerror.h"
LLViewerTextureAnim::LLViewerTextureAnim() : LLTextureAnim()
{
mLastFrame = -1.f; // Force an update initially
mLastTime = 0.f;
mOffS = mOffT = 0;
mScaleS = mScaleT = 1;
mRot = 0;
}
LLViewerTextureAnim::~LLViewerTextureAnim()
{
}
void LLViewerTextureAnim::reset()
{
LLTextureAnim::reset();
mTimer.reset();
}
S32 LLViewerTextureAnim::animateTextures(F32 &off_s, F32 &off_t,
F32 &scale_s, F32 &scale_t,
F32 &rot)
{
S32 result = 0;
if (!(mMode & ON))
{
mLastTime = 0.f;
mLastFrame = -1.f;
return result;
}
F32 num_frames = 1.0;
F32 full_length = 1.0;
if (mLength)
{
num_frames = mLength;
}
else
{
num_frames = llmax(1.f, (F32)(mSizeX * mSizeY));
}
if (mMode & PING_PONG)
{
if (mMode & SMOOTH)
{
full_length = 2.f*num_frames;
}
else if (mMode & LOOP)
{
full_length = 2.f*num_frames - 2.f;
full_length = llmax(1.f, full_length);
}
else
{
full_length = 2.f*num_frames - 1.f;
full_length = llmax(1.f, full_length);
}
}
else
{
full_length = num_frames;
}
F32 frame_counter;
if (mMode & SMOOTH)
{
frame_counter = mTimer.getElapsedTimeAndResetF32() * mRate + (F32)mLastTime;
}
else
{
frame_counter = mTimer.getElapsedTimeF32() * mRate;
}
mLastTime = frame_counter;
if (mMode & LOOP)
{
frame_counter = fmod(frame_counter, full_length);
}
else
{
frame_counter = llmin(full_length - 1.f, frame_counter);
}
if (!(mMode & SMOOTH))
{
frame_counter = (F32)llfloor(frame_counter + 0.01f);
}
if (mMode & PING_PONG)
{
if (frame_counter >= num_frames)
{
if (mMode & SMOOTH)
{
frame_counter = num_frames - (frame_counter - num_frames);
}
else
{
frame_counter = (num_frames - 1.99f) - (frame_counter - num_frames);
}
}
}
if (mMode & REVERSE)
{
if (mMode & SMOOTH)
{
frame_counter = num_frames - frame_counter;
}
else
{
frame_counter = (num_frames - 0.99f) - frame_counter;
}
}
frame_counter += mStart;
if (!(mMode & SMOOTH))
{
frame_counter = (F32)llround(frame_counter);
}
//
// Now that we've calculated the frame time, do an update.
// Will we correctly update stuff if the texture anim has
// changed, but not the frame counter?
//
if (mLastFrame != frame_counter)
{
mLastFrame = frame_counter;
if (mMode & ROTATE)
{
result |= ROTATE;
mRot = rot = frame_counter;
}
else if (mMode & SCALE)
{
result |= SCALE;
mScaleS = scale_s = frame_counter;
mScaleT = scale_t = frame_counter;
}
else
{
result |= TRANSLATE;
F32 x_frame;
S32 y_frame;
F32 x_pos;
F32 y_pos;
if ( (mSizeX)
&&(mSizeY))
{
result |= SCALE;
mScaleS = scale_s = 1.f/mSizeX;
mScaleT = scale_t = 1.f/mSizeY;
x_frame = fmod(frame_counter, mSizeX);
y_frame = (S32)(frame_counter / mSizeX);
x_pos = x_frame * scale_s;
y_pos = y_frame * scale_t;
mOffS = off_s = (-0.5f + 0.5f*scale_s)+ x_pos;
mOffT = off_t = (0.5f - 0.5f*scale_t) - y_pos;
}
else
{
mScaleS = scale_s = 1.f;
mScaleT = scale_t = 1.f;
x_pos = frame_counter * scale_s;
mOffS = off_s = (-0.5f + 0.5f*scale_s)+ x_pos;
mOffT = off_t = 0.f;
}
}
}
return result;
}
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