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for the past few days I've been trying to implement mouse picking in my vulkan game engine and part of that is reading data from framebuffers. Now I can successfully read RGBA data. But what I need is to read specific attachment containing id of the entity.

Here is what my fragment shader looks like: 

#version 450 core

struct VertexInput
{
    vec4 Color;
    vec2 TexCoord;
    float TilingFactor;
};

// Inputs
layout(location = 0) in VertexInput Input;
layout(location = 3) in flat uint in_TexIndex;
layout(location = 4) in flat int in_EntityID;

layout(binding = 1) uniform sampler2D u_Samplers[10];

// Outputs
layout(location = 0) out vec4 o_Color;
layout(location = 1) out int o_EntityID; //  <-- This is what I need

void main()
{
    o_EntityID = in_EntityID;
    o_Color = Input.Color * texture(u_Samplers[in_TexIndex], Input.TexCoord * Input.TilingFactor);
}

And get this warning

Validation layer: Validation Warning: [ UNASSIGNED-CoreValidation-Shader-OutputNotConsumed ] Object 0: handle = 0x5dbcf90000000065, type = VK_OBJECT_TYPE_SHADER_MODULE; | MessageID = 0x609a13b | fragment shader writes to output location 1 with no matching attachment

which is understandable.

I know I need to add attachment into my framebuffer object but I am not sure which one or how should I approach this problem. Any ideas? Thanks :)

ezyn
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  • It is unclear what the problem is. You clearly are able to add one attachment to the renderpass/framebuffer. So just do that again. – Nicol Bolas Sep 08 '22 at 19:04
  • Yeah, I realized that I can just use another COLOR attachment and read from it. – ezyn Sep 08 '22 at 20:22

0 Answers0