#version 330

uniform vec2 uViewportRes;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;

layout (location = 0) in vec3 position;
layout (location = 1) in vec3 tangent;
layout (location = 2) in vec4 iColor;
layout (location = 3) in float iLineWidth;

out vec4 color;
out float lineWidth;
out float lineStrength;

void main(void) {
	int index = gl_VertexID % 6;
	float orientation = 1.0f + ( (index % 2) * -2 );

	vec4 positionScreen = projection * view * model * vec4(position, 1.0f);
	vec4 directionScreen = projection * view * model * vec4(position + tangent, 0.0f);

	vec4 normal = positionScreen - directionScreen;

	positionScreen.xyz /= positionScreen.w;
	positionScreen.xy *= (uViewportRes * 0.5f);

	float aspectRatio = projection[1][1] / projection[0][0];

	normal.xyz /= normal.w;
	positionScreen += vec4(normalize(normal.yx * vec2(-1.0f, 1.0f) * orientation), 0.0f, 0.0f) * 0.5f * iLineWidth;

	positionScreen.xy /= (uViewportRes * 0.5f);
	positionScreen.xyz *= positionScreen.w;
	

	gl_Position = positionScreen;

	lineWidth = iLineWidth;
	lineStrength = orientation;
	color = iColor;
}

void mainBackup(void)
{
	float aspectRatio = 0.0f;

	int index = gl_VertexID % 6;
	float orientation = 1 + ( (index % 2) * -2 );

	vec4 positionCamera = view * model * vec4(position, 1.0f);

	float distance = -position.z;

	vec4 tv = projection * view * model * vec4(position + tangent, 0.0f);

	vec4 v = vec4(normalize(tv.yx) * orientation * vec2(-1.0f, 1.0f), 0.0f, 0.0f) * distance;

	vec4 direction = positionCamera - tv;

	direction.xy = direction.yx * vec2(-1.0f, 1.0f) * orientation;

	gl_Position = (projection * positionCamera) + vec4(direction.xy, 0.0f, 0.0f);

	lineWidth = iLineWidth;
	lineStrength = orientation;
	color = vec4(iColor.xyz, 1.0f);
}