transparent_pass.cpp

// SPDX-License-Identifier: MIT
// Author:  Giovanni Santini
// Mail:    giovanni.santini@proton.me
// Github:  @San7o
 
#include <brenta/renderer/passes/transparent_pass.hpp>
#include <brenta/renderer/opengl/gl.hpp>
#include <brenta/renderer/material.hpp>
#include <brenta/renderer/model.hpp>
#include <brenta/renderer/point_light.hpp>
#include <brenta/renderer/dir_light.hpp>
#include <brenta/renderer/opengl/framebuffer.hpp>
 
using namespace brenta;
 
TransparentPass::TransparentPass(tenno::shared_ptr<FrameBuffer> fb,
                                 bool clear, bool set_viewport)
{
  this->fb    = fb;
  this->clear = clear;
  this->set_viewport = set_viewport;
}
 
void TransparentPass::begin()
{
  this->fb->bind();
 
  if (this->set_viewport)
    Gl::set_viewport(0, 0, this->fb->width, this->fb->height);
 
  if (this->clear)
    Gl::clear();
}
 
void TransparentPass::end()
{
  this->fb->unbind();
}
 
void TransparentPass::execute(const Renderer::RenderData& data)
{
  for (auto& command : data.transparent_queue)
  {
    auto material = command.model->material;
    material->shader->use();
    
    // Setup all lights
    int lights_number = 0;
    if (data.point_lights.size() > 0)
    {
      for (auto& point_light : data.point_lights)
      {
        point_light->apply(lights_number);
        lights_number++;
      }
    }
    material->shader->set_int("n_point_lights", lights_number);
 
    if (data.dir_light)
      data.dir_light.value()->apply();
 
    material->shader->set_mat4("view",       data.view);
    material->shader->set_mat4("projection", data.projection);
    material->shader->set_mat4("model",
                               // Node world position
                               command.world_matrix *
                               // Local transform
                               command.model->transform.get_model_matrix());
    material->shader->set_vec3("view_pos",    data.cam_position);
 
    // Geometry
    command.model->draw();
  }
}