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//! Predefined shaders used in postprocessing
 
/// Postprocessing 2d passthrough shader
pub const POST_VERTEX_SHADER: &str = r"
#version 150 core

in vec2 a_Pos;
in vec2 a_TexCoord;
out vec2 v_TexCoord;

void main() {
	v_TexCoord = a_TexCoord;
	gl_Position = vec4(a_Pos, 0.0, 1.0);
}
";

/// Postprocessing 2d shader, does a linear to sRGB conversion
pub const POST_PIXEL_SHADER: &str = r"
#version 150 core

uniform sampler2D t_Source;

in vec2 v_TexCoord;
out vec4 o_Color;

vec4 to_sRGB(vec4 linearRGB)
{
    bvec4 cutoff = lessThan(linearRGB, vec4(0.0031308));
    vec4 higher = vec4(1.055)*pow(linearRGB, vec4(1.0/2.4)) - vec4(0.055);
    vec4 lower = linearRGB * vec4(12.92);

    return mix(higher, lower, cutoff);
}

void main() {
	vec4 sampled_color = texture(t_Source, v_TexCoord, 0);
	o_Color = vec4(to_sRGB(sampled_color).rgb, sampled_color.a);
}
";

/// Postprocessing 2d shader, performs a MSAA4x resolution followed by a linear to sRGB conversion
pub const POST_PIXEL_SHADER_MSAA_4X: &str = r"
#version 150 core

uniform sampler2DMS t_Source;

in vec2 v_TexCoord;
out vec4 o_Color;

vec4 to_sRGB(vec4 linearRGB)
{
    bvec4 cutoff = lessThan(linearRGB, vec4(0.0031308));
    vec4 higher = vec4(1.055)*pow(linearRGB, vec4(1.0/2.4)) - vec4(0.055);
    vec4 lower = linearRGB * vec4(12.92);

    return mix(higher, lower, cutoff);
}

void main() {
	vec2 d = textureSize(t_Source);
	ivec2 i = ivec2(d * v_TexCoord);
	vec4 sampled_color = (texelFetch(t_Source, i, 0) + texelFetch(t_Source, i, 1)
			+ texelFetch(t_Source, i, 2) + texelFetch(t_Source, i, 3)) / 4.0;
	o_Color = vec4(to_sRGB(sampled_color).rgb, sampled_color.a);
}
";