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193 lines
8.9 KiB
193 lines
8.9 KiB
/* |
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This file is part of Magnum. |
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Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, |
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2020, 2021, 2022, 2023 Vladimír Vondruš <mosra@centrum.cz> |
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Permission is hereby granted, free of charge, to any person obtaining a |
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copy of this software and associated documentation files (the "Software"), |
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to deal in the Software without restriction, including without limitation |
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the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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and/or sell copies of the Software, and to permit persons to whom the |
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Software is furnished to do so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included |
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in all copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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DEALINGS IN THE SOFTWARE. |
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*/ |
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#include "DistanceFieldGlyphCache.h" |
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#include "Magnum/Image.h" |
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#include "Magnum/ImageView.h" |
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#include "Magnum/PixelFormat.h" |
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#include "Magnum/GL/Context.h" |
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#include "Magnum/GL/Extensions.h" |
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#ifndef CORRADE_NO_ASSERT |
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#include "Magnum/GL/PixelFormat.h" |
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#endif |
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#include "Magnum/GL/TextureFormat.h" |
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#include "Magnum/Math/Range.h" |
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#include "Magnum/TextureTools/DistanceField.h" |
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namespace Magnum { namespace Text { |
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DistanceFieldGlyphCache::DistanceFieldGlyphCache(const Vector2i& sourceSize, const Vector2i& size, const UnsignedInt radius): |
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#if !(defined(MAGNUM_TARGET_GLES) && defined(MAGNUM_TARGET_GLES2)) |
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GlyphCache(GL::TextureFormat::R8, sourceSize, size, Vector2i(radius)), |
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#elif !defined(MAGNUM_TARGET_WEBGL) |
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/* Luminance is not renderable in most cases */ |
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GlyphCache(GL::Context::current().isExtensionSupported<GL::Extensions::EXT::texture_rg>() ? |
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GL::TextureFormat::R8 : GL::TextureFormat::RGB8, sourceSize, size, Vector2i(radius)), |
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#else |
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GlyphCache(GL::TextureFormat::RGB, sourceSize, size, Vector2i(radius)), |
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#endif |
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_size{size}, _distanceField{radius} |
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{ |
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#ifndef MAGNUM_TARGET_GLES |
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MAGNUM_ASSERT_GL_EXTENSION_SUPPORTED(GL::Extensions::ARB::texture_rg); |
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#endif |
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/* Replicating the assertion from TextureTools::DistanceField so it gets |
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checked during construction already instead of only later during the |
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setImage() call */ |
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CORRADE_ASSERT(sourceSize % size == Vector2i{0} && |
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(sourceSize/size) % 2 == Vector2i{0}, |
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"Text::DistanceFieldGlyphCache: expected source and destination size ratio to be a multiple of 2, got" << Debug::packed << sourceSize << "and" << Debug::packed << size, ); |
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#if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL) |
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/* Luminance is not renderable in most cases */ |
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if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::texture_rg>()) |
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Warning() << "Text::DistanceFieldGlyphCache:" << GL::Extensions::EXT::texture_rg::string() << "not supported, using inefficient RGB format for glyph cache texture"; |
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#endif |
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} |
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DistanceFieldGlyphCache::DistanceFieldGlyphCache(NoCreateT) noexcept: GlyphCache{NoCreate}, _distanceField{NoCreate} {} |
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GlyphCacheFeatures DistanceFieldGlyphCache::doFeatures() const { |
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return GlyphCacheFeature::ImageProcessing |
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#ifndef MAGNUM_TARGET_GLES |
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|GlyphCacheFeature::ProcessedImageDownload |
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#endif |
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; |
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} |
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void DistanceFieldGlyphCache::doSetImage(const Vector2i& offset, const ImageView2D& image) { |
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GL::Texture2D input; |
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input.setWrapping(GL::SamplerWrapping::ClampToEdge) |
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.setMinificationFilter(GL::SamplerFilter::Linear) |
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.setMagnificationFilter(GL::SamplerFilter::Linear); |
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/* The constructor already checked that the ratio is an integer multiple, |
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so this division should lead to no information loss */ |
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CORRADE_INTERNAL_ASSERT(size().xy() % _size == Vector2i{0}); |
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const Vector2i ratio = size().xy()/_size; |
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/* Upload the input texture and create a distance field from it. On ES2 |
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without EXT_unpack_subimage and on WebGL 1 there's no possibility to |
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upload just a slice of the input, upload the whole image instead by |
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ignoring the PixelStorage properties of the input and also process it as |
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a whole. */ |
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#ifdef MAGNUM_TARGET_GLES2 |
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#ifndef MAGNUM_TARGET_WEBGL |
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if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::unpack_subimage>()) |
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#endif |
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{ |
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input.setImage(0, GL::textureFormat(image.format()), ImageView2D{image.format(), size().xy(), image.data()}); |
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_distanceField(input, texture(), {{}, size().xy()/ratio}, size().xy()); |
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#ifdef MAGNUM_TARGET_WEBGL |
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static_cast<void>(offset); |
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#endif |
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} |
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#ifndef MAGNUM_TARGET_WEBGL |
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else |
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#endif |
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#endif |
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#if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL)) |
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{ |
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/* Create an image view that includes the distance field radius as |
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well, to be sure the edges are processed appropriately as well */ |
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/** @todo this feels more like a hack than a real solution, any better |
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idea? Tried to make TextureTools::DistanceField pad the processing |
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area on its own, but eventually gave up as it would (a) made the |
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processing do more work than necessary in many cases, with no easy |
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way to opt out of that, (b) wasn't really working if the input |
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didn't have a black strip around the edge on platforms that don't |
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support border clamp, (c) required the input texture to have |
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certain wrapping mode set */ |
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CORRADE_INTERNAL_ASSERT(image.storage().skip().xy() == offset); |
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#ifdef CORRADE_NO_ASSERT |
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static_cast<void>(offset); |
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#endif |
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const Vector2i paddedMin = Math::max(Vector2i{0}, |
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image.storage().skip().xy() - padding()); |
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const Vector2i paddedMax = Math::min(size().xy(), |
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image.size() + image.storage().skip().xy() + padding()); |
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/* TextureTools::DistanceField expects the input size and output |
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rectangle size ratio to be a multiple of 2 in order for the shader |
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to perform pixel addressing correctly. That might not always be the |
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case with the rectangle passed to flushImage(), so round the |
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paddedMin *down* to a multiple of the ratio and paddedMax *up* to a |
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multiple of the ratio. */ |
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const Vector2i paddedMinRounded = ratio*(paddedMin/ratio); |
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const Vector2i paddedMaxRounded = ratio*((paddedMax + ratio - Vector2i{1})/ratio); |
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/* As the size is also a multiple of ratio, the resulting size should |
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not get larger. */ |
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CORRADE_INTERNAL_ASSERT(paddedMaxRounded <= size().xy()); |
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const ImageView2D paddedImage{ |
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PixelStorage{image.storage()} |
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.setSkip({paddedMinRounded, image.storage().skip().z()}), |
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image.format(), |
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paddedMaxRounded - paddedMinRounded, |
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image.data()}; |
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input.setImage(0, GL::textureFormat(paddedImage.format()), paddedImage); |
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_distanceField(input, texture(), Range2Di::fromSize(paddedMinRounded/ratio, paddedImage.size()/ratio), paddedImage.size()); |
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} |
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#endif |
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} |
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void DistanceFieldGlyphCache::setDistanceFieldImage(const Vector2i& offset, const ImageView2D& image) { |
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CORRADE_ASSERT((offset >= Vector2i{} && offset + image.size() <= _size).all(), |
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"Text::DistanceFieldGlyphCache::setDistanceFieldImage():" << Range2Di::fromSize(offset, image.size()) << "out of range for texture size" << _size, ); |
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#ifndef CORRADE_NO_ASSERT |
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const GL::PixelFormat format = GL::pixelFormat(image.format()); |
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#endif |
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#if !(defined(MAGNUM_TARGET_GLES) && defined(MAGNUM_TARGET_GLES2)) |
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CORRADE_ASSERT(format == GL::PixelFormat::Red, |
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"Text::DistanceFieldGlyphCache::setDistanceFieldImage(): expected" << GL::PixelFormat::Red << "but got" << format, ); |
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#else |
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#ifndef MAGNUM_TARGET_WEBGL |
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if(GL::Context::current().isExtensionSupported<GL::Extensions::EXT::texture_rg>()) |
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CORRADE_ASSERT(format == GL::PixelFormat::Red, |
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"Text::DistanceFieldGlyphCache::setDistanceFieldImage(): expected" << GL::PixelFormat::Red << "but got" << format, ); |
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else |
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#endif |
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{ |
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/* Luminance is not renderable in most cases */ |
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CORRADE_ASSERT(format == GL::PixelFormat::RGB, |
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"Text::DistanceFieldGlyphCache::setDistanceFieldImage(): expected" << GL::PixelFormat::RGB << "but got" << format, ); |
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} |
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#endif |
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texture().setSubImage(0, offset, image); |
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} |
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#ifndef MAGNUM_TARGET_GLES |
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Image3D DistanceFieldGlyphCache::doProcessedImage() { |
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Image2D out = _texture.image(0, PixelFormat::R8Unorm); |
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return Image3D{out.format(), {out.size(), 1}, out.release()}; |
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} |
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#endif |
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}}
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