Problems with reading a textureCube from a computeshader

[sebastian-wolter-itk]

I'm trying to do the following:

• Run a computeshader
• computeshader should read from a textureCube via direction vector
• Write sample color to an output image

Leads to:

• "Shader has no variable "mySampler"" (if pass:send via name)
• or "Shader has no variable in slot -1" (if pass:send via bindings directly

Anything i am missing here?

 
fisheye = {}
fisheye.width = 512
  fisheye.height = 512
  fisheye.texture = lovr.graphics.newTexture(fisheye.width,fisheye.height, {
    usage = { 'sample', 'storage', 'transfer' },
    linear = true -- srgb textures don't always support storage usage
  })
fisheye.computeShader = lovr.graphics.newShader([[
layout(local_size_x = 8, local_size_y = 8) in;
layout(set = 2, binding = 0) uniform sampler mySampler;
layout(set = 2, binding = 1, rgba8) uniform image2D result;
layout(set = 2, binding = 2) uniform textureCube myCube;

void lovrmain() 
{
      ivec2 size = imageSize(result);
      ivec2 id = ivec2(GlobalThreadID.xy);
      if (id.x >= size.x || id.y >= size.y) {
        return;
      }
      float x = 1.0;
      float y = 1.0;
      float z = 1.0;
      vec3 dir = vec3(x, y, z);
      // vec4 color = getpixel(myCube, dir); // does not work
      vec4 color = texture(samplerCube(myCube, mySampler), dir);
      imageStore(result, id, color);
}
  ]])
local tw, th = texture:getDimensions()
local sx, sy = shader:getWorkgroupSize()
local gx, gy = math.ceil(tw / sx), math.ceil(th / sy)

local clampler = lovr.graphics.newSampler({ wrap = 'clamp' })

local computer = lovr.graphics.newPass()
computer:setShader(fisheye.computeShader)
-- Leads to Shader has no variable "mySampler"
computer:send("mySampler", clampler)
computer:send("result", fisheye.texture)
computer:send("myCube", cubemap.texture)
-- Leads to "Shader has no variable in slot -1" ???
--computer:send(0, clampler)
--computer:send(1, fisheye.texture)
--computer:send(2, cubemap.texture)
computer:compute(gx, gy)
lovr.graphics.submit(computer)

[bjornbytes]

Compute shaders use set #0 for resources instead of set 2, e.g.

layout(set = 0, binding = 0) uniform sampler mySampler;
// or just
layout(binding = 0) uniform sampler mySampler;

Also if you're using a nightly build, the layout(set = X, binding = X) decorations are optional and LÖVR will figure them out automatically.

[sebastian-wolter-itk]

Thanks, that solves the compiling issue