#version 450
#extension GL_ARB_separate_shader_objects : enable
#extension GL_ARB_shading_language_420pack : enable
#extension GL_EXT_nonuniform_qualifier : require

struct MatPropData
{
  vec4 color;
};

struct GenericData
{
  //! Delta time
  float dt;

  //! Elapsed time of the application
  float elapsedTime;

  //! Viewport width of the scene (excluding imgui, that means smaller than window)
  uint viewportWidth;

  //! Ditto but for height
  uint viewportHeight;
};

layout(location = 0) in struct
{
  vec4 vertPos; // location 0
  vec2 uv; // location = 1
  vec4 normal; // location = 2
  vec4 worldPos; // location = 3 
} In;

// material stuff
layout(location = 4) flat in struct
{
  int materialIndex;
  uint eid;
  uint lightLayerIndex;
} In2;

layout (set = 0, binding = 1) uniform sampler2D textures[]; // for textures (global)
layout (std430, set = 2, binding = 0) buffer MaterialProperties     // For materials 
{
  MatPropData data[];
} MatProp;

layout (set = 0, binding = 0) uniform GenericDataBuffer
{
  GenericData data;
} genericDataBuffer;

layout(location = 0) out vec4 objectVFX;
layout(input_attachment_index = 0, set = 3, binding = 0) uniform subpassInput depthBuffer;

void main()
{
  // Sample depth buffer using UV and save it
  float currentDepth = subpassLoad (depthBuffer).r;

  // Use depth buffer to check against current fragment's depth. If fragment is behind depth buffer, render fragment.
  if (currentDepth > gl_FragCoord.z)
    discard;

    objectVFX = MatProp.data[In2.materialIndex].color;

}