Brightness.frag fails to load visual studio 2017

[dburchill]

sample code compiled with visual studio 2017 fails to load shader, to fix change Brightness.frag line 12
from:
sourceFragment *= clamp(luminance - Threshold, 0.0, 1.0) * Factor;
to:
sourceFragment *= clamp(luminance - Threshold, 0.f, 1.f) * Factor;

[Bromeon]

That's strange, because both 0.0 and 1.0 are float literals in GLSL, and also the expression luminance - Threshold is float.

Do you know what OpenGL/GLSL versions you have?

Context:

uniform sampler2D source;

const float Threshold = 0.7;
const float Factor   = 4.0;

void main()
{
	vec4 sourceFragment = texture2D(source, gl_TexCoord[0].xy);
	float luminance = sourceFragment.r * 0.2126 + sourceFragment.g * 0.7152 + sourceFragment.b * 0.0722;
	sourceFragment *= clamp(luminance - Threshold, 0.0, 1.0) * Factor;
	gl_FragColor = sourceFragment;
}