.. _program_listing_file_Src_GraphicsEngineOpenGL_scene_shadows_ShadowMap.cpp:

Program Listing for File ShadowMap.cpp
======================================

|exhale_lsh| :ref:`Return to documentation for file <file_Src_GraphicsEngineOpenGL_scene_shadows_ShadowMap.cpp>` (``Src/GraphicsEngineOpenGL/scene/shadows/ShadowMap.cpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #include "scene/shadows/ShadowMap.hpp"
   
   #include <stdio.h>
   
   ShadowMap::ShadowMap()
     :
   
       FBO(0), shadow_map(0), shadow_width(0), shadow_height(0)
   
   {}
   
   bool ShadowMap::init(GLuint width, GLuint height)
   {
       shadow_width = width;
       shadow_height = height;
   
       glGenFramebuffers(1, &FBO);
   
       glGenTextures(1, &shadow_map);
       glBindTexture(GL_TEXTURE_2D, shadow_map);
       glTexImage2D(
         GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, shadow_width, shadow_height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, nullptr);
   
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
   
       float border_color[] = { 1.0f, 1.0f, 1.0f, 1.0f };
       glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, border_color);
   
       glBindFramebuffer(GL_FRAMEBUFFER, FBO);
       glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, shadow_map, 0);
   
       glDrawBuffer(GL_NONE);
       glReadBuffer(GL_NONE);
   
       GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
   
       if (status != GL_FRAMEBUFFER_COMPLETE) {
           printf("Framebuffer error: %i\n", status);
           return false;
       }
   
       glBindFramebuffer(GL_FRAMEBUFFER, 0);
   
       return true;
   }
   
   void ShadowMap::write() { glBindFramebuffer(GL_FRAMEBUFFER, FBO); }
   
   void ShadowMap::read(GLenum texture_unit)
   {
       glActiveTexture(texture_unit);
       glBindTexture(GL_TEXTURE_2D, shadow_map);
   }
   
   ShadowMap::~ShadowMap()
   {
       if (FBO) { glDeleteFramebuffers(1, &FBO); }
   
       if (shadow_map) { glDeleteTextures(1, &shadow_map); }
   }