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90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
4 years ago
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/******************************************************************************
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* File - glText.h
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* Author - Joey Pollack
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* Date - 2021/09/07 (y/m/d)
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* Mod Date - 2021/09/07 (y/m/d)
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* Description - Used to load and manage fonts. Renders text using freetype
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* and openGL.
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******************************************************************************/
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#ifndef GL_TEXT_H_
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#define GL_TEXT_H_
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#include <map>
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#include <vector>
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#include <glad/gl.h>
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#include "glShader.h"
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#include <utils/opRes.h>
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#include <utils/types.h>
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#include <glm/glm.hpp>
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namespace lunarium
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{
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class glText
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{
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public:
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OpRes Initialize();
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int LoadFont(const char* fontFile, float size = 12.0f, int weight = 400);
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void DrawString(int fontID, const char* text, glm::vec2 position, Color color, float scale, glm::mat4 projection);
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void DrawString(int fontID, const char* text, glm::vec2 topLeft, glm::vec2 botRight, Color color, float scale, glm::mat4 projection);
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private:
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struct Character
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{
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unsigned int TextureID; // ID handle of the glyph texture
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Sizef Size; // Size of glyph
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glm::vec2 Bearing; // Offset from baseline to left/top of glyph
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int DownShift; // Size/Amount of glyph below the baseline
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unsigned int Advance; // Offset to advance to next glyph
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};
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struct Font
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{
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// The tallest character that does not go below the base line
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// This is also the distance from the string Y position to the baseline
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unsigned int MaxHeight;
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// This is the max distance a char will go below the baseline
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unsigned int MaxDownShift;
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std::map<char, Character> CharSet;
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Font() : MaxHeight(0), MaxDownShift(0)
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{}
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};
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std::vector<Font> mFonts;
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GLuint mTextVAO;
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GLuint mTextVBO;
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glShader mTextShader;
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private: // SHADER CODE
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const char* VertShader = "#version 450 core\n\
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layout(location = 0) in vec4 vertex; \
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out vec2 TexCoords;\
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\
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uniform mat4 projection;\
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\
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void main()\
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{\
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gl_Position = projection * vec4(vertex.xy, 0.0, 1.0);\
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TexCoords = vertex.zw;\
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} ";
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const char* FragShader = "#version 450 core\n\
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in vec2 TexCoords;\
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out vec4 color;\
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\
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uniform sampler2D text;\
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uniform vec4 textColor;\
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\
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void main()\
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{\
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vec4 sampled = vec4(1.0, 1.0, 1.0, texture(text, TexCoords).r);\
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color = vec4(textColor) * sampled;\
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}";
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};
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}
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#endif // GL_TEXT_H_
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