mirror of https://github.com/mosra/magnum.git
Vladimír Vondruš
3 years ago
7 changed files with 182 additions and 131 deletions
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/*
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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 <Corrade/Containers/StringView.h> |
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#include <Corrade/PluginManager/Manager.h> |
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#include "Magnum/Math/Color.h" |
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#include "Magnum/Math/Matrix3.h" |
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#include "Magnum/Shaders/VectorGL.h" |
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#include "Magnum/Text/AbstractFont.h" |
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#include "Magnum/Text/DistanceFieldGlyphCache.h" |
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#include "Magnum/Text/Renderer.h" |
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#define DOXYGEN_ELLIPSIS(...) __VA_ARGS__ |
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using namespace Magnum; |
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using namespace Magnum::Math::Literals; |
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namespace { |
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Vector2i windowSize() { return {}; } |
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Vector2i framebufferSize() { return {}; } |
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Vector2 dpiScaling() { return {}; } |
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} |
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int main() { |
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{ |
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/* [AbstractFont-usage] */ |
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PluginManager::Manager<Text::AbstractFont> manager; |
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Containers::Pointer<Text::AbstractFont> font = |
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manager.loadAndInstantiate("StbTrueTypeFont"); |
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if(!font->openFile("font.ttf", 12.0f)) |
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Fatal{} << "Can't open font.ttf with StbTrueTypeFont"; |
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Text::GlyphCache cache{Vector2i{128}}; |
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font->fillGlyphCache(cache, "abcdefghijklmnopqrstuvwxyz" |
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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"0123456789?!:;,. "); |
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/* [AbstractFont-usage] */ |
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} |
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{ |
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/* -Wnonnull in GCC 11+ "helpfully" says "this is null" if I don't initialize
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the font pointer. I don't care, I just want you to check compilation errors, |
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not more! */ |
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PluginManager::Manager<Text::AbstractFont> manager; |
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/* [DistanceFieldGlyphCache-usage] */ |
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Containers::Pointer<Text::AbstractFont> font = DOXYGEN_ELLIPSIS(manager.loadAndInstantiate("")); |
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font->openFile("font.ttf", 96.0f); |
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Text::DistanceFieldGlyphCache cache{Vector2i{1024}, Vector2i{128}, 12}; |
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font->fillGlyphCache(cache, "abcdefghijklmnopqrstuvwxyz" |
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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"0123456789?!:;,. "); |
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/* [DistanceFieldGlyphCache-usage] */ |
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} |
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{ |
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/* -Wnonnull in GCC 11+ "helpfully" says "this is null" if I don't initialize
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the font pointer. I don't care, I just want you to check compilation errors, |
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not more! */ |
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PluginManager::Manager<Text::AbstractFont> manager; |
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/* [GlyphCache-usage] */ |
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Containers::Pointer<Text::AbstractFont> font = DOXYGEN_ELLIPSIS(manager.loadAndInstantiate("")); |
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font->openFile("font.ttf", 12.0f); |
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Text::GlyphCache cache{Vector2i{128}}; |
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font->fillGlyphCache(cache, "abcdefghijklmnopqrstuvwxyz" |
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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"0123456789?!:;,. "); |
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/* [GlyphCache-usage] */ |
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} |
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{ |
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/* -Wnonnull in GCC 11+ "helpfully" says "this is null" if I don't initialize
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the font pointer. I don't care, I just want you to check compilation errors, |
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not more! */ |
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PluginManager::Manager<Text::AbstractFont> manager; |
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/* [Renderer-usage1] */ |
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/* Font instance, received from a plugin manager */ |
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Containers::Pointer<Text::AbstractFont> font = DOXYGEN_ELLIPSIS(manager.loadAndInstantiate("")); |
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/* Open a 12 pt font */ |
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font->openFile("font.ttf", 12.0f); |
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/* Populate a glyph cache */ |
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Text::GlyphCache cache{Vector2i{128}}; |
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font->fillGlyphCache(cache, "abcdefghijklmnopqrstuvwxyz" |
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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"0123456789?!:;,. "); |
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Shaders::VectorGL2D shader; |
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GL::Buffer vertexBuffer, indexBuffer; |
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GL::Mesh mesh; |
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/* Render a 12 pt text, centered */ |
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std::tie(mesh, std::ignore) = Text::Renderer2D::render(*font, cache, 12.0f, |
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"Hello World!", vertexBuffer, indexBuffer, GL::BufferUsage::StaticDraw, |
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Text::Alignment::LineCenter); |
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/* Projection matrix is matching application window size to have the size match
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12 pt in other applications, assuming a 96 DPI display and no UI scaling. */ |
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Matrix3 projectionMatrix = Matrix3::projection(Vector2{windowSize()}); |
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/* Draw the text on the screen */ |
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shader |
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.setTransformationProjectionMatrix(projectionMatrix) |
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.setColor(0xffffff_rgbf) |
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.bindVectorTexture(cache.texture()) |
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.draw(mesh); |
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/* [Renderer-usage1] */ |
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/* [Renderer-usage2] */ |
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/* Initialize the renderer and reserve memory for enough glyphs */ |
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Text::Renderer2D renderer{*font, cache, 12.0f, Text::Alignment::LineCenter}; |
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renderer.reserve(32, GL::BufferUsage::DynamicDraw, GL::BufferUsage::StaticDraw); |
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/* Update the text occasionally */ |
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renderer.render("Hello World Countdown: 10"); |
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/* Draw the text on the screen */ |
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shader.setTransformationProjectionMatrix(projectionMatrix) |
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.setColor(0xffffff_rgbf) |
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.bindVectorTexture(cache.texture()) |
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.draw(renderer.mesh()); |
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/* [Renderer-usage2] */ |
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} |
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{ |
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/* [Renderer-dpi-interface-size] */ |
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Vector2 interfaceSize = Vector2{windowSize()}/dpiScaling(); |
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/* [Renderer-dpi-interface-size] */ |
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/* [Renderer-dpi-size-multiplier] */ |
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Float sizeMultiplier = |
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(Vector2{framebufferSize()}*dpiScaling()/Vector2{windowSize()}).max(); |
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/* [Renderer-dpi-size-multiplier] */ |
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static_cast<void>(interfaceSize); |
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static_cast<void>(sizeMultiplier); |
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} |
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} |
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