"flat" is automatically added to int/ivec attributes

[btmxh]

This is probably an intended feature, but when the compiler adds "flat" to vertex shader input, and I convert the file to GLSL using SPIRV-Cross, loaded it into my OpenGL program, it triggers a compilation error. (I haven't tried passing the SPIR-V code directly to GL though.)

Example:

This code:

[[spirv::in(0)]]
ivec4 pos;

[[spirv::vert]]
void vert_main() { 
  glvert_Output.Position = vec4(pos);
}

becomes this in SPIR-V disassembly:

; SPIR-V
; Version: 1.5
; Generator: Khronos; 0
; Bound: 19
; Schema: 0
               OpCapability Shader
               OpExtension "GL_EXT_scalar_block_layout"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Vertex %_Z9vert_mainv "_Z9vert_mainv" %pos %glvert_Output
               OpName %pos "pos"
               OpName %gl_PerVertex "gl_PerVertex"
               OpMemberName %gl_PerVertex 0 "Position"
               OpName %glvert_Output "glvert_Output"
               OpName %_Z9vert_mainv "_Z9vert_mainv"
               OpDecorate %pos Location 0
               OpDecorate %pos Flat
               OpDecorate %gl_PerVertex Block
               OpMemberDecorate %gl_PerVertex 0 BuiltIn Position
        %int = OpTypeInt 32 1
      %v4int = OpTypeVector %int 4
%_ptr_Input_v4int = OpTypePointer Input %v4int
        %pos = OpVariable %_ptr_Input_v4int Input
      %float = OpTypeFloat 32
    %v4float = OpTypeVector %float 4
%gl_PerVertex = OpTypeStruct %v4float
%_ptr_Output_gl_PerVertex = OpTypePointer Output %gl_PerVertex
%glvert_Output = OpVariable %_ptr_Output_gl_PerVertex Output
       %void = OpTypeVoid
         %12 = OpTypeFunction %void
%_ptr_Output_v4float = OpTypePointer Output %v4float
      %int_0 = OpConstant %int 0
%_Z9vert_mainv = OpFunction %void None %12
         %13 = OpLabel
         %14 = OpLoad %v4int %pos
         %15 = OpConvertSToF %v4float %14
         %18 = OpAccessChain %_ptr_Output_v4float %glvert_Output %int_0
               OpStore %18 %15
               OpReturn
               OpFunctionEnd

(flat is added in line 16)

GLSL output:

#version 450

layout(location = 0) flat in ivec4 pos;

void main()
{
    gl_Position = vec4(pos);
}

[btmxh]

Adding something like [[spirv::noflat]] would be helpful

[seanbaxter]

Ya flat is intentional. When I get around to more shader improvements I will add a noflat attribute.