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/**
* @file llfontvertexbuffer.cpp
* @brief Buffer storage for font rendering.
*
* $LicenseInfo:firstyear=2024&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2024, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "llfontvertexbuffer.h"
#include "llvertexbuffer.h"
LLFontVertexBuffer::LLFontVertexBuffer(bool track_changes)
: mTrackStringChanges(track_changes)
{
}
LLFontVertexBuffer::~LLFontVertexBuffer()
{
reset();
}
void LLFontVertexBuffer::reset()
{
mBufferList.clear();
}
S32 LLFontVertexBuffer::render(
const LLFontGL* fontp,
const LLWString& text,
S32 begin_offset,
F32 x, F32 y,
const LLColor4& color,
LLFontGL::HAlign halign, LLFontGL::VAlign valign,
U8 style,
LLFontGL::ShadowType shadow,
S32 max_chars , S32 max_pixels,
F32* right_x,
bool use_ellipses,
bool use_color )
{
if (!LLFontGL::sDisplayFont) //do not display texts
{
return static_cast<S32>(text.length());
}
if (mBufferList.empty())
{
genBuffers(fontp, text, begin_offset, x, y, color, halign, valign,
style, shadow, max_chars, max_pixels, right_x, use_ellipses, use_color);
}
else if (mLastX != x
|| mLastY != y
|| mLastFont != fontp
|| mLastColor != color // alphas change often
|| mLastHalign != halign
|| mLastValign != valign
|| mLastOffset != begin_offset
|| mLastMaxChars != max_chars
|| mLastMaxPixels != max_pixels
|| mLastStyle != style
|| mLastShadow != shadow // ex: buttons change shadow state
|| mLastScaleX != LLFontGL::sScaleX
|| mLastScaleY != LLFontGL::sScaleY
|| mLastOrigin != LLFontGL::sCurOrigin)
{
genBuffers(fontp, text, begin_offset, x, y, color, halign, valign,
style, shadow, max_chars, max_pixels, right_x, use_ellipses, use_color);
}
else if (mTrackStringChanges && mLastStringHash != sStringHasher._Do_hash(text))
{
genBuffers(fontp, text, begin_offset, x, y, color, halign, valign,
style, shadow, max_chars, max_pixels, right_x, use_ellipses, use_color);
}
else
{
renderBuffers();
if (right_x)
{
*right_x = mLastRightX;
}
}
return mChars;
}
void LLFontVertexBuffer::genBuffers(
const LLFontGL* fontp,
const LLWString& text,
S32 begin_offset,
F32 x, F32 y,
const LLColor4& color,
LLFontGL::HAlign halign, LLFontGL::VAlign valign,
U8 style, LLFontGL::ShadowType shadow,
S32 max_chars, S32 max_pixels,
F32* right_x,
bool use_ellipses,
bool use_color)
{
mBufferList.clear();
gGL.beginList(&mBufferList);
mChars = fontp->render(text, begin_offset, x, y, color, halign, valign,
style, shadow, max_chars, max_pixels, right_x, use_ellipses, use_color);
gGL.endList();
mLastFont = fontp;
mLastOffset = begin_offset;
mLastMaxChars = max_chars;
mLastMaxPixels = max_pixels;
mLastStringHash = sStringHasher._Do_hash(text);
mLastX = x;
mLastY = y;
mLastColor = color;
mLastHalign = halign;
mLastValign = valign;
mLastStyle = style;
mLastShadow = shadow;
mLastScaleX = LLFontGL::sScaleX;
mLastScaleY = LLFontGL::sScaleY;
mLastOrigin = LLFontGL::sCurOrigin;
if (right_x)
{
mLastRightX = *right_x;
}
}
void LLFontVertexBuffer::renderBuffers()
{
gGL.flush(); // deliberately empty pending verts
gGL.getTexUnit(0)->enable(LLTexUnit::TT_TEXTURE);
gGL.pushUIMatrix();
for (LLVertexBufferData& buffer : mBufferList)
{
buffer.draw();
}
gGL.popUIMatrix();
}
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