Utils.hpp

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#pragma once
 
#include <glad/glad.h>
#include <Rendering/FrameBuffers/SceneFrameBuffer.hpp>
#include <Rendering/ShaderProgram.hpp>
 
namespace shkyera::utils {
 
void drawFullscreenQuad();
 
template <typename ValueType>
std::pair<std::string, ValueType> Uniform(const std::string& name, const ValueType& value) {
  return std::make_pair(name, value);
}
 
template <typename... Uniforms>
void applyShaderToFrameBuffer(
    SceneFrameBuffer& frameBuffer, ShaderProgram& shaderProgram,
    std::vector<std::pair<const char*, const Texture*>> textures,  // List of texture bindings with texture unit indices
    Uniforms... uniforms)                                          // Parameter pack for uniform values
{
  // Bind framebuffer and activate shader program
  frameBuffer.bind();
  UseShader shaderUsage(shaderProgram);
 
  // Bind textures to their corresponding texture units
  int textureIndex = 0;
  for (const auto& [name, texture] : textures) {
    texture->activate(GL_TEXTURE0 + textureIndex);
    shaderProgram.setUniform(name, textureIndex++);
  }
 
  // Set uniforms using the parameter pack
  (shaderProgram.setUniform(uniforms.first, uniforms.second), ...);
 
  // Draw fullscreen quad
  utils::drawFullscreenQuad();
 
  // Stop using the shader program and unbind framebuffer
  frameBuffer.unbind();
}
 
template <typename ArrayType, typename... Uniforms>
void applyShaderToFrameBuffer(
    SceneFrameBuffer& frameBuffer, ShaderProgram& shaderProgram,
    std::vector<std::pair<const char*, const Texture*>> textures,  // List of texture bindings with texture unit indices
    std::pair<const char*, std::vector<ArrayType>> array,
    Uniforms... uniforms)  // Parameter pack for uniform values
{
  // Bind framebuffer and activate shader program
  frameBuffer.bind();
  shaderProgram.use();
 
  // Bind textures to their corresponding texture units
  int textureIndex = 0;
  for (const auto& [name, texture] : textures) {
    texture->activate(GL_TEXTURE0 + textureIndex);
    shaderProgram.setUniform(name, textureIndex++);
  }
 
  int index = 0;
  for (const auto& val : array.second) {
    shaderProgram.setUniform(std::string(array.first) + "[" + std::to_string(index++) + "]", val);
  }
 
  // Set uniforms using the parameter pack
  (shaderProgram.setUniform(uniforms.first, uniforms.second), ...);
 
  // Draw fullscreen quad
  utils::drawFullscreenQuad();
 
  // Stop using the shader program and unbind framebuffer
  shaderProgram.stopUsing();
  frameBuffer.unbind();
}
 
}  // namespace shkyera::utils