How to Access a Large Static Table from Fragment Shader

[ChthonVII]

I want to access (read) a large table of static floats from within a fragment shader. Can this be done in BGFX, and how?

It sounds like setBuffer() is BGFX substitute for UBOs and the like. But the little documentation I can find on setBuffer() suggests that it can only be used for compute shaders. Is there a way to use this in a fragment shader?

Also, how?
c++:

bgfx::VertexBufferHandle somehandle = bgfx::createVertexBuffer(bgfx::makeRef(&my_array_of_floats[0], size_of_my_array_in_bytes???), BGFX_BUFFER_COMPUTE_READ);
bgfx::setBuffer(???, somehandle, Read);

shader:

??? (How do I read from the buffer in the shader?)

[pezcode]

You can use buffers inside fragment shaders as well ☺️ It's just not available on some older APIs like WebGL or ancient OpenGL

??? (How do I read from the buffer in the shader?)

// the 3 is the bind slot, not the size
BUFFER_RO(myBuffer, float, 3);

float x = myBuffer[0];

Then in C++:

const float data[] = {1.0f, 2.0f, 3.0f, 4.0f};

// at init:
bgfx::VertexLayout layout;
layout.begin()
    .add(bgfx::Attrib::TexCoord0, 1, bgfx::AttribType::Float)
    .end();
// note: on D3D backends you may also need BGFX_BUFFER_COMPUTE_TYPE_FLOAT | BGFX_BUFFER_COMPUTE_FORMAT_32X1
somehandle = createVertexBuffer(makeRef(&data[0], sizeof(data)), layout, BGFX_BUFFER_COMPUTE_READ);

// at draw time:

// the 3 matches whatever bind slot you used in BUFFER_RO
bgfx::setBuffer(3, somehandle, Read);

[ChthonVII]

Thanks!
Am I correct to assume that slots are shared across textures and buffers?

[pezcode]

Indeed they are shared