UltimateZoneBuilder/Source/Core/Resources/things2d_sprite.fp

in vec4 Color;
in vec2 UV;

out vec4 FragColor;

// Render settings
// w = transparency
uniform vec4 rendersettings;
uniform float desaturation;

uniform sampler2D texture1;
uniform vec4 texturefactor;

vec3 desaturate(vec3 texel)
{
	float gray = (texel.r * 0.3 + texel.g * 0.56 + texel.b * 0.14);	
	return mix(texel, vec3(gray), desaturation);
}

void main()
{
	// Take this pixel's color
	vec4 c = texture(texture1, UV);
	
	// Modulate it by selection color
	if (Color.a > 0.0)
	{
		vec3 cr = desaturate(c.rgb);
		FragColor = vec4((cr.r + Color.r) / 2.0f, (cr.g + Color.g) / 2.0f, (cr.b + Color.b) / 2.0f, c.a * rendersettings.w * Color.a);
	}
	else
	{
		// Or leave it as it is
		FragColor = vec4(desaturate(c.rgb), c.a * rendersettings.w);
	}

	FragColor *= texturefactor;

	#if defined(ALPHA_TEST)
	if (FragColor.a < 0.5) discard;
	#endif
}