/******************************************************************************
 * The MIT License (MIT)
 * 
 * Copyright (c) 2015-2018 Baldur Karlsson
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 ******************************************************************************/

layout (location = 0) in vec4 position;
layout (location = 1) in vec4 IN_secondary;

#ifndef OPENGL_ES
out gl_PerVertex
{
	vec4 gl_Position;
	float gl_PointSize;
};
#endif

layout (location = 0) out vec4 secondary;
layout (location = 1) out vec4 norm;

void main(void)
{
	vec2 psprite[4] = vec2[]
	(
		vec2(-1.0f, -1.0f),
		vec2(-1.0f,  1.0f),
		vec2( 1.0f, -1.0f),
		vec2( 1.0f,  1.0f)
	);

	vec4 pos = position;
	if(Mesh.homogenousInput == 0u)
	{
		pos = vec4(position.xyz, 1);
	}
	else
	{
#ifdef VULKAN
		pos = vec4(position.x, -position.y, position.z, position.w);
#endif
	}

	gl_Position = Mesh.mvp * pos;
	gl_Position.xy += Mesh.pointSpriteSize.xy*0.01f*psprite[VERTEX_ID%4]*gl_Position.w;
	secondary = IN_secondary;
	norm = vec4(0, 0, 1, 1);

#ifdef VULKAN
	// GL->VK conventions
	gl_Position.y = -gl_Position.y;
	if(Mesh.rawoutput == 0)
	{
		gl_Position.z = (gl_Position.z + gl_Position.w) / 2.0;
	}

	gl_PointSize = 4.0f;
#endif
}
