[linux + vulkan] using textureSize will create empty shader files

[sh-dave]

When i use https://registry.khronos.org/OpenGL-Refpages/gl4/html/textureSize.xhtml in a shader, krafix writes a 0 bytes file but it shows no error.

#version 450

in vec2 f_uv;

uniform sampler2D u_msdf;
uniform vec4 u_background_color;
uniform vec4 u_foreground_color;
uniform float u_px_range;

out vec4 FragColor;

float median( float r, float g, float b ) {
	return max(min(r, g), min(max(r, g), b));
}

float screen_px_range() {
	// vec2 unit_range = vec2(u_px_range) / vec2(textureSize(u_msdf, 0));
        vec2 unit_range = vec2(1.0, 1.0);
	vec2 screen_tex_size = vec2(1.0) / fwidth(f_uv);
	return max(0.5 * dot(unit_range, screen_tex_size), 1.0);
}

void main() {
	vec3 msd = texture(u_msdf, f_uv).rgb;
	float sd = median(msd.r, msd.g, msd.b);
	float screen_px_distance = screen_px_range() * (sd - 0.5);
	float opacity = clamp(screen_px_distance + 0.5, 0.0, 1.0);
	FragColor = mix(u_background_color, u_foreground_color, opacity);
}

[RobDangerous]

I can't reproduce that.

[RobDangerous]

Oooh, it's commented out in your shader, sneaky.

[RobDangerous]

Now I can reproduce it. But I can't reproduce it with

in vec2 texcoord;

out vec4 FragColor;

uniform sampler2D texsampler;

void main() {
	vec4 color = texture(texsampler, texcoord);
	FragColor = vec4(color.r, color.g, color.b * textureSize(texsampler, 0).x, 1.0);
}

So it might not actually be about textureSize.

[sh-dave]

Indeed, found an easier way. This will fail, but works when you change a to a vec2.

#version 450

in vec2 texcoord;

out vec4 FragColor;

uniform sampler2D texsampler;
uniform vec2 a; // works when this is vec2
uniform float b;

void main() {
	float foo = b;
	vec4 color = texture(texsampler, texcoord);
	FragColor = vec4(color.r, color.g, color.b * textureSize(texsampler, 0).x, 1.0);
}

[RobDangerous]

But but but a is already a vec2.

[sh-dave]

Sorry, copied the wrong shader, make it a vec3 and it fails.

[RobDangerous]

It was indeed completely unrelated to textureSize. Even unrelated to textures overall. It was about uniform alignment and by removing that one line you allowed the compiler to remove a uniform and thereby the problem.