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91 lines
2.4 KiB
91 lines
2.4 KiB
4 years ago
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#ifndef OPENGLHANDLER_H
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#define OPENGLHANDLER_H
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#include <QtCore>
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#include <QImage>
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#include <QOpenGLContext>
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#include <QOffscreenSurface>
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#include <QOpenGLFramebufferObject>
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#include <QOpenGLShaderProgram>
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#include <QOpenGLTexture>
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#include <QOpenGLBuffer>
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#include <ft2build.h>
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#include <glm/glm.hpp>
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#include <glm/gtc/matrix_transform.hpp>
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#include <glm/gtc/type_ptr.hpp>
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#include <QtGui/QOpenGLFunctions_3_3_Core>
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#include FT_FREETYPE_H
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struct VertexData
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{
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QVector2D position;
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QVector2D texCoord;
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};
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struct Character {
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unsigned int TextureID; //ID handle of the glyph texture
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glm::ivec2 Size; //Size of glyph
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glm::ivec2 Bearing; //Offset from baseline to left/top of glyph
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long Advance; //Offset to advance to next glyph
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};
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class OpenGLHandler
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{
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public:
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OpenGLHandler();
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~OpenGLHandler();
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void run();
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void processImage(const QImage& image,
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const QString& vertexShader,
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const QString& fragmentShader,
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const QString& textureVar,
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const QString& vertexPosVar,
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const QString& textureCoordVar);
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private:
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QOpenGLFunctions_3_3_Core* fun;
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QOpenGLContext _context;
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QOffscreenSurface _surface;
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QOpenGLFramebufferObject* _fbo;
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QImage* _image;
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QOpenGLShaderProgram* _shader;
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QOpenGLTexture _texture;
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FT_Library _ft;
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FT_Face _face;
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QMap<char, Character> _characters;
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QString vertexShader =
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"attribute vec4 aPosition;\n"
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"attribute vec2 aTexCoord;\n"
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"varying vec2 vTexCoord;\n"
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"void main()\n"
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"{\n"
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" gl_Position = aPosition;\n"
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" vTexCoord = aTexCoord;\n"
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"}";
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QString fragmentShader =
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"uniform sampler2D texture;\n"
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"varying vec2 vTexCoord;\n"
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"void main()\n"
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"{\n"
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" gl_FragColor = texture2D(texture, vTexCoord);\n"
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"}";
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unsigned int chVAO, chVBO;
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bool prepareShader(QString vertexShader, QString fragmentShader);
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bool prepareTexture(const QImage& image);
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bool prepareCoords(QOpenGLBuffer vertexBuf, QOpenGLBuffer indexBuf);
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void loadChars();
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void processText();
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void RenderText(std::string text, float x, float y, float scale, glm::vec3 color);
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bool prepareCoords2(QOpenGLBuffer vertexBuf, QOpenGLBuffer indexBuf);
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void flipImage();
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QString getImage(QImage img);
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};
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#endif //OPENGLHANDLER_H
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