/*
This file is part of Magnum.
Original authors — credit is appreciated but not required:
2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
2020, 2021, 2022, 2023, 2024, 2025
— Vladimír Vondruš <mosra@centrum.cz>
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or distribute
this software, either in source code form or as a compiled binary, for any
purpose, commercial or non-commercial, and by any means.
In jurisdictions that recognize copyright laws, the author or authors of
this software dedicate any and all copyright interest in the software to
the public domain. We make this dedication for the benefit of the public
at large and to the detriment of our heirs and successors. We intend this
dedication to be an overt act of relinquishment in perpetuity of all
present and future rights to this software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <Corrade/PluginManager/Manager.h>
#include <Corrade/Utility/FormatStl.h>
#include <Corrade/Utility/Resource.h>
#include <Magnum/GL/DefaultFramebuffer.h>
#include <Magnum/GL/Mesh.h>
#include <Magnum/GL/Renderer.h>
#include <Magnum/Math/Color.h>
#include <Magnum/Math/Complex.h>
#include <Magnum/Math/Matrix3.h>
#include <Magnum/Platform/Sdl2Application.h>
#include <Magnum/Shaders/DistanceFieldVectorGL.h>
#include <Magnum/Text/AbstractFont.h>
#include <Magnum/Text/DistanceFieldGlyphCacheGL.h>
#include <Magnum/Text/Renderer.h>
namespace Magnum { namespace Examples {
using namespace Math::Literals;
class TextExample: public Platform::Application {
public:
explicit TextExample(const Arguments& arguments);
private:
void viewportEvent(ViewportEvent& event) override;
void drawEvent() override;
void scrollEvent(ScrollEvent& event) override;
void updateText();
PluginManager::Manager<Text::AbstractFont> _manager;
Containers::Pointer<Text::AbstractFont> _font;
Text::DistanceFieldGlyphCacheGL _cache;
GL::Mesh _rotatingText{NoCreate};
GL::Buffer _vertices, _indices;
Containers::Pointer<Text::Renderer2D> _dynamicText;
Shaders::DistanceFieldVectorGL2D _shader;
Matrix3 _transformationRotatingText,
_projectionRotatingText,
_transformationProjectionDynamicText;
};
TextExample::TextExample(const Arguments& arguments):
Platform::Application{arguments, Configuration{}
.setTitle("Magnum Text Example")
.setWindowFlags(Configuration::WindowFlag::Resizable)},
_cache{Vector2i{2048}, Vector2i{512}, 22}
{
/* Load a TrueTypeFont plugin and open the font */
Utility::Resource rs("fonts");
_font = _manager.loadAndInstantiate("TrueTypeFont");
if(!_font || !_font->openData(rs.getRaw("SourceSansPro-Regular.ttf"), 180.0f))
Fatal{} << "Cannot open font file";
/* Glyphs we need to render everything */
_font->fillGlyphCache(_cache,
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789:-+,.!°ěäПривітСΓειασουκόμ ");
/* Text that rotates using mouse wheel. Size relative to the window size
(1/10 of it) -- if you resize the window, it gets bigger */
std::tie(_rotatingText, std::ignore) = Text::Renderer2D::render(*_font, _cache, 0.2f,
"Hello, world!\n"
"Ahoj, světe!\n"
"Привіт Світ!\n"
"Γεια σου κόσμε!\n"
"Hej Världen!",
_vertices, _indices, GL::BufferUsage::StaticDraw, Text::Alignment::MiddleCenter);
_transformationRotatingText = Matrix3::rotation(-10.0_degf);
_projectionRotatingText = Matrix3::projection(
Vector2::xScale(Vector2{windowSize()}.aspectRatio()));
/* Dynamically updated text that shows rotation/zoom of the other. Size in
points that stays the same if you resize the window. Aligned so top
right of the bounding box is at mesh origin, and then transformed so the
origin is at the top right corner of the window. */
_dynamicText.reset(new Text::Renderer2D(*_font, _cache, 32.0f, Text::Alignment::TopRight));
_dynamicText->reserve(40, GL::BufferUsage::DynamicDraw, GL::BufferUsage::StaticDraw);
_transformationProjectionDynamicText =
Matrix3::projection(Vector2{windowSize()})*
Matrix3::translation(Vector2{windowSize()}*0.5f);
/* Set up premultiplied alpha blending to avoid overlapping text characters
to cut into each other */
GL::Renderer::enable(GL::Renderer::Feature::Blending);
GL::Renderer::setBlendFunction(GL::Renderer::BlendFunction::One, GL::Renderer::BlendFunction::OneMinusSourceAlpha);
GL::Renderer::setBlendEquation(GL::Renderer::BlendEquation::Add, GL::Renderer::BlendEquation::Add);
updateText();
}
void TextExample::viewportEvent(ViewportEvent& event) {
GL::defaultFramebuffer.setViewport({{}, event.framebufferSize()});
_projectionRotatingText = Matrix3::projection(
Vector2::xScale(Vector2{windowSize()}.aspectRatio()));
_transformationProjectionDynamicText =
Matrix3::projection(Vector2{windowSize()})*
Matrix3::translation(Vector2{windowSize()}*0.5f);
}
void TextExample::drawEvent() {
GL::defaultFramebuffer.clear(GL::FramebufferClear::Color);
_shader.bindVectorTexture(_cache.texture());
_shader
.setTransformationProjectionMatrix(
_projectionRotatingText*_transformationRotatingText)
.setColor(0x2f83cc_rgbf)
.setOutlineColor(0xdcdcdc_rgbf)
.setOutlineRange(0.45f, 0.35f)
.setSmoothness(0.025f/_transformationRotatingText.uniformScaling())
.draw(_rotatingText);
_shader
.setTransformationProjectionMatrix(_transformationProjectionDynamicText)
.setColor(0xffffff_rgbf)
.setOutlineRange(0.5f, 1.0f)
.setSmoothness(0.075f)
.draw(_dynamicText->mesh());
swapBuffers();
}
void TextExample::scrollEvent(ScrollEvent& event) {
if(!event.offset().y()) return;
if(event.offset().y() > 0)
_transformationRotatingText = Matrix3::rotation(1.0_degf)*Matrix3::scaling(Vector2{1.1f})* _transformationRotatingText;
else
_transformationRotatingText = Matrix3::rotation(-1.0_degf)*Matrix3::scaling(Vector2{1.0f/1.1f})* _transformationRotatingText;
updateText();
event.setAccepted();
redraw();
}
void TextExample::updateText() {
_dynamicText->render(Utility::formatString("Rotation: {:.2}°\nScale: {:.2}",
Float(Deg(Complex::fromMatrix(_transformationRotatingText.rotation()).angle())),
_transformationRotatingText.uniformScaling()));
}
}}
MAGNUM_APPLICATION_MAIN(Magnum::Examples::TextExample)