Constant Buffer Violation about spartanengine HOT 2 CLOSED

Hi Kliaxe,

Thanks for your kind words, I'm glad you find it helpful 😃

Try removing g_padding from the struct...

struct FrameBuffer
{
    Math::Matrix view;
    Math::Matrix projection;
    Math::Matrix projection_ortho;
    Math::Matrix view_projection;
    Math::Matrix view_projection_inv;
    Math::Matrix view_projection_ortho;
    Math::Matrix view_projection_unjittered;

    ...

    float ssr_enabled;
    float shadow_resolution;
    float ssao_scale;
    float white_balance;
};

... and from the cbuffer

cbuffer FrameBuffer : register(b0)
{
	matrix g_view;
	matrix g_projection;
	matrix g_projectionOrtho;
	matrix g_viewProjection;
	matrix g_viewProjectionInv;
	matrix g_viewProjectionOrtho;
	matrix g_viewProjectionUnjittered;

        ...
	
	float g_ssr_enabled;
	float g_shadow_resolution;
	float g_ssao_scale;
	float g_white_balance;
};

It should work now.

This is because HLSL has some packing/alignment rules for constant buffers (16-byte boundaries), detailed here.

On top of that, the compiler can choose to add padding to something like a struct, introducing a potential scenario where what you map from the CPU, is different from what the GPU expects.

So it's a good idea to explicitly/manually ensure correct padding both on the CPU and the GPU.

I hope this helps 👍

from spartanengine.

Hello, thank you for the quick answer! Yes, that definitely did the trick!
I'm now closing this issue as the problem has been solved.

from spartanengine.