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174 lines
7.9 KiB
174 lines
7.9 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 "DistanceFieldGlyphCacheGL.h" |
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#include <Corrade/Containers/Optional.h> |
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#include "Magnum/ImageView.h" |
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#include "Magnum/PixelFormat.h" |
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#if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL) |
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#include "Magnum/GL/Context.h" |
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#include "Magnum/GL/Extensions.h" |
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#endif |
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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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namespace Magnum { namespace Text { |
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DistanceFieldGlyphCacheGL::DistanceFieldGlyphCacheGL(const Vector2i& size, const Vector2i& processedSize, const UnsignedInt radius): |
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GlyphCacheGL{PixelFormat::R8Unorm, size, |
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#if !defined(MAGNUM_TARGET_GLES) || !defined(MAGNUM_TARGET_GLES2) |
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PixelFormat::R8Unorm, |
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#else |
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#ifndef MAGNUM_TARGET_WEBGL |
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/* Without EXT_texture_rg, PixelFormat::R8Unorm maps to Luminance which |
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is not renderable in most cases. RGB is *theoretically* space- |
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efficient but practically the driver uses RGBA internally anyway, so |
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just use RGBA. */ |
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GL::Context::current().isExtensionSupported<GL::Extensions::EXT::texture_rg>() ? |
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PixelFormat::R8Unorm : |
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#endif |
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PixelFormat::RGBA8Unorm, |
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#endif |
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processedSize, Vector2i(radius)}, |
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_distanceField{radius} |
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{ |
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/* Replicating the assertion from TextureTools::DistanceFieldGL 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(size % processedSize == Vector2i{0} && |
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(size/processedSize) % 2 == Vector2i{0}, |
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"Text::DistanceFieldGlyphCacheGL: expected source and processed size ratio to be a multiple of 2, got" << Debug::packed << size << "and" << Debug::packed << processedSize, ); |
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#if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL) |
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/* On ES2 print a warning to make it known that EXT_texture_rg wasn't |
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available. On WebGL 1 this is the case always, so a warning would be |
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just a noise. */ |
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if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::texture_rg>()) |
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Warning() << "Text::DistanceFieldGlyphCacheGL:" << GL::Extensions::EXT::texture_rg::string() << "not supported, using a full RGBA format for the distance field texture"; |
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#endif |
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} |
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DistanceFieldGlyphCacheGL::DistanceFieldGlyphCacheGL(NoCreateT) noexcept: GlyphCacheGL{NoCreate}, _distanceField{NoCreate} {} |
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GlyphCacheFeatures DistanceFieldGlyphCacheGL::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 DistanceFieldGlyphCacheGL::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() % processedSize().xy() == Vector2i{0}); |
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const Vector2i ratio = size().xy()/processedSize().xy(); |
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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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/* The image range was already expanded to include the padding in |
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flushImage() */ |
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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 = image.storage().skip().xy(); |
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const Vector2i paddedMax = image.size() + image.storage().skip().xy(); |
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/* TextureTools::DistanceFieldGL 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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#ifdef MAGNUM_BUILD_DEPRECATED |
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void DistanceFieldGlyphCacheGL::setDistanceFieldImage(const Vector2i& offset, const ImageView2D& image) { |
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/* The original function accepted GL pixel formats as well, try to |
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translate them back to the generic format. If that fails, pass the image |
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as-is let the base implementation deal with that instead. |
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Replacing the whole view instead of just the format so we don't need to |
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do any special-casing for when the format stays implementation-specific |
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and requires a pixel size to be specified externally. */ |
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ImageView2D imageToUse = image; |
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if(isPixelFormatImplementationSpecific(image.format())) { |
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if(const Containers::Optional<PixelFormat> candidateFormat = GL::genericPixelFormat(pixelFormatUnwrap<GL::PixelFormat>(image.format()), GL::PixelType(image.formatExtra()))) |
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imageToUse = ImageView2D{image.storage(), *candidateFormat, image.size(), image.data()}; |
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} |
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setProcessedImage(offset, imageToUse); |
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} |
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#endif |
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}}
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