GLDepthTexture.h

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#pragma once
 
#include <vector>
 
#include "GLEnv.h"

class GLDepthTexture {
public:
  GLDepthTexture(GLint magFilter=GL_LINEAR, GLint minFilter=GL_LINEAR,
                 GLint wrapX=GL_CLAMP_TO_EDGE, GLint wrapY=GL_CLAMP_TO_EDGE) :
  id{ 0 },
  width{ 0 },
  height{ 0 },
  dataType{ GLDepthDataType::DEPTH24 }
  {
    GL(glGenTextures(1, &id));
    GL(glBindTexture(GL_TEXTURE_2D, id));
    GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapX));
    GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapY));
    GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magFilter));
    GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minFilter));
    GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE));
    GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LESS));
  }

  ~GLDepthTexture() {
    GL(glDeleteTextures(1, &id));
  }

  const GLuint getId() const {return id;}

  void setEmpty(uint32_t width, uint32_t height,
                GLDepthDataType dataType=GLDepthDataType::DEPTH24) {
    this->width = width;
    this->height = height;
 
    GL(glBindTexture(GL_TEXTURE_2D, id));
    GL(glPixelStorei(GL_PACK_ALIGNMENT ,1));
    GL(glPixelStorei(GL_UNPACK_ALIGNMENT ,1));
 
    switch (dataType) {
      case GLDepthDataType::DEPTH16:
        GL(glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT16, GLsizei(width),
                        GLsizei(height), 0,GL_DEPTH_COMPONENT, GL_FLOAT, 0));
        break;
      case GLDepthDataType::DEPTH24:
        GL(glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24, GLsizei(width),
                        GLsizei(height), 0,GL_DEPTH_COMPONENT, GL_FLOAT, 0));
        break;
      case GLDepthDataType::DEPTH32:
        GL(glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32, GLsizei(width),
                        GLsizei(height), 0,GL_DEPTH_COMPONENT, GL_FLOAT, 0));
        break;
    }
  }


  uint32_t getHeight() const {return height;}
  uint32_t getWidth() const {return width;}
  GLDepthDataType getType() const {return dataType;}

  void setFilter(GLint magFilter, GLint minFilter) {
    GL(glBindTexture(GL_TEXTURE_2D, id));
    GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magFilter));
    GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minFilter));
  }
 
private:
  GLuint id;                
  uint32_t width;           
  uint32_t height;          
  GLDepthDataType dataType; 
};