vkTextRenderer.h

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#ifndef VKTEXTRENDERER_H
#define VKTEXTRENDERER_H
 
#include <jGL/Vulkan/pipeline.h>
#include <jGL/Vulkan/Text/vkFont.h>
#include <jGL/Vulkan/Command/command.h>
#include <memory>
 
namespace jGL::Vulkan
{
 
  class TextRenderer 
  {
 
  public:
 
    TextRenderer
    (
      const Device & device,
      const Command & command,
      const RenderPass & renderPass,
      const VkViewport & viewport,
      const VkRect2D & scissor,
      uint32_t concurrentFrames,
      VkSampleCountFlagBits msaa
    );
 
    ~TextRenderer(){}
 
    void renderText
    (
      const Device & device,
      const Command & command,
      const VkCommandBuffer & commandBuffer,
      uint32_t currentFrame,
      std::string text,
      glm::vec2 position,
      float scale,
      glm::vec4 colour,
      glm::bvec2 centre = glm::bvec2(false,false)
    );
 
    void setProjection(glm::mat4 p);
 
  private:
 
    const char * vert = "#version 450\n"
      "layout(location = 0) in vec4 posTex;\n"
      "layout(set = 0, binding = 0) uniform vUBO { mat4 proj; } ubo;\n"
      "layout(location = 0) out vec2 texCoords;\n"
      "void main()\n"
      "{\n"
      "    gl_Position = ubo.proj * vec4(posTex.xy, 0.0, 1.0);\n"
      "    texCoords = posTex.zw;\n"
      "}\n";
 
    const char * frag = "#version 450\n"
      "layout(location = 0) in vec2 texCoords;\n"
      "layout(location = 0) out vec4 colour;\n"
      "layout(set = 0, binding = 1) uniform fUBO { vec4 textColour; } ubo;\n"
      "layout(set = 1, binding = 0) uniform usampler2D glyph;\n"
      "void main()\n"
      "{\n"
      "   vec4 glpyhSample = vec4(1.0,1.0,1.0, texture(glyph,texCoords.xy).r);\n"
      "   colour = ubo.textColour*glpyhSample;\n"
      "}";
 
    vkShader shader;
 
    std::shared_ptr<VertexBufferObject> pos;
    std::shared_ptr<UniformBufferObject> uboV, uboF;
    std::vector<glm::vec4> vertices;
 
    VkImageView characterTextureView;
 
    std::shared_ptr<vkTexture> fontTexture;
    std::shared_ptr<Sampler> fontSampler;
 
    std::unique_ptr<vkFont> font;
 
    std::unique_ptr<Pipeline> textPipeline;
 
    struct vUBO {glm::mat4 proj;};
    struct fUBO {glm::vec4 colour;};
 
    glm::ivec2 res;
 
  };
}
 
#endif /* TEXTRENDERER */