Fragment shader fails to compile: undeclared identifier 'vec4_splat'

[justcore69]

I'm trying to compile a set of simple pass-through shaders using shadercDebug.exe, but while the vertex shader compiles without complaints, the fragment shader fails with the following error:

Code:
---
      void main( float4 gl_FragCoord : SV_POSITION , float4 v_color : COLOR0 , out float4 bgfx_FragData0 : SV_TARGET0 ) {

>>>   float4 bgfx_VoidFrag = vec4_splat(0.0);
>>>                          ^

      bgfx_FragData0 = v_color;
      }
---
Error: D3DCompile failed 0x80004005 (5,24-38): error X3004: undeclared identifier 'vec4_splat'

Failed to build shader.

For the vertex shader, I used this command:
shadercDebug.exe -f shaders/vs_test.sc -o shaders/vs_test.bin --type vertex --platform windows -p s_5_0 --varying shaders/varying.def.sc

And for the fragment shader:
shadercDebug.exe -f shaders/fs_test.sc -o shaders/fs_test.bin --type fragment --platform windows -p s_5_0 --varying shaders/varying.def.sc

Shader sources:

vs_test.sc

$input a_position, a_color0
$output v_color

void main() {
    gl_Position = vec4(a_position, 1.0);
    v_color = a_color0;
}

fs_test.sc

$input v_color

void main() {
    gl_FragColor = v_color;
}

varying.def.sc

vec4 v_color : COLOR0;
vec4 a_color0 : COLOR0;
vec3 a_position : POSITION;

I've tried switching from s_5_0 to different profiles (such as s_4_0 and 150), but the error remains the same.

I'm new to bgfx, so I'm puzzled by this error. Specifically, why is vec4_splat not recognized during the fragment shader compilation? Is it supposed to be provided by the shader compiler, or do I need to define it myself somewhere in my code?

Any guidance or suggestions to resolve this issue would be greatly appreciated!

Thanks in advance for your help.

[bkaradzic]

You forgot to include header that has definition of vec4_splat

[justcore69]

After further investigation, I found this article showing that both shaders include #include <bgfx_shader.sh>. So I copied that include into my shaders, but it resulted in the warning: Warning: Cannot open include file "bgfx_shader.sh"

Reviewing the documentation again, I noticed that shaderc uses the -i flag for including files, which implies I need to manually specify the path to bgfx_shader.sh. I searched almost every directory the file could be in, but I still couldn't find it.

Is there a tutorial or additional resource that explains where to obtain or how to properly reference bgfx_shader.sh?

[bkaradzic]

Every single example in repo is using this include. You can start from provided examples, until you get more familiar with tools.

[justcore69]

Still, I don't understand why I get this warning: Warning: Cannot open include file "bgfx_shader.sh"

[bkaradzic]

It's not in include path, or it's not in local directory... I don't know your setup. If you used provided makefile it would work.

[wuxianggujun]

I think you can read my project Tina I am also a newbie to Bgfx. I have been in contact with this for a long time, but I can only use it simply! You can read the cmake/modules/ShaderUtils.cmake in my renderer/refactor branch. This cmake contains a simple example of how to compile 2d_fs.sc, 2d_vs.sc into a bin file! I also learned that it can be so simple to encapsulate by looking at other people's projects! And there are also simple examples in the bgfx example directory that can be used for learning!