glTextRenderer.h

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#ifndef TEXTRENDERER_H
#define TEXTRENDERER_H
 
#include <jGL/OpenGL/gl.h>
#include <jGL/OpenGL/Text/glFont.h>
#include <jGL/OpenGL/Shader/glShader.h>
 
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
 
namespace jGL::GL
{
 
  class TextRenderer 
  {
 
  public:
 
    TextRenderer(glm::vec2 res);
 
    ~TextRenderer()
    {
      glDeleteBuffers(1,&VBO);
      glDeleteVertexArrays(1,&VAO);
    }
 
    void renderText
    (
      glFont font,
      std::string text,
      glm::vec2 position,
      float scale,
      glm::vec4 colour,
      glm::vec2 res,
      glm::bvec2 centre = glm::bvec2(false,false)
    );
 
    void setProjection(glm::mat4 p)
    {
      
      projection = p;
 
      shader.use();
      shader.setUniform<glm::mat4>("proj", projection);
 
    }
 
    void clear()
    {
      vertices.clear();
      charactersUploaded = 0;
      setBufferSize(512);
    }
 
  private:
  
    const char * vert = "#version " GLSL_VERSION "\n"
      "precision lowp float;\n precision lowp int;\n"
      "layout(location=0) in vec4 posTex;\n"
      "uniform mat4 proj;\n"
      "out vec2 texCoords;\n"
      "void main()\n"
      "{\n"
      "    gl_Position = proj * vec4(posTex.xy, 0.0, 1.0);\n"
      "    texCoords = posTex.zw;\n"
      "}\n";
 
    const char * frag = "#version " GLSL_VERSION "\n"
      "precision lowp float;\n precision lowp int;\n"
      "in vec2 texCoords;\n"
      "layout(location=0) out vec4 colour;\n"
      "uniform vec4 textColour;\n"
      "uniform sampler2D glyph;\n"
      "void main()\n"
      "{\n"
      "   vec4 glpyhSample = vec4(1.0,1.0,1.0, texture(glyph,texCoords.xy).r);\n"
      "   colour = textColour*glpyhSample;\n"
      "}";
 
    glShader shader;
    GLuint VAO;
    GLuint VBO;
 
    uint16_t charactersUploaded;
    std::vector<float> vertices;
 
    glm::mat4 projection;
    glm::vec2 res;
 
 
    void setBufferSize(uint16_t s);
 
  };
}
#endif /* TEXTRENDERER_H */