<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//
//  deferred_light_limited.vert
//  vertex shader
//
//  Created by Sam Gateau on 6/16/16.
//  Copyright 2014 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//


<@include gpu/Transform.slh@>
<@include gpu/Inputs.slh@>
<@include graphics/Light.slh@>
<@include render-utils/ShaderConstants.h@>

<$declareStandardTransform()$>

<$declareLightBuffer(256)$>

LAYOUT(binding=RENDER_UTILS_BUFFER_LIGHT_INDEX) uniform lightIndexBuffer {
    int lightIndex[256];
};

layout(location=RENDER_UTILS_ATTR_TEXCOORD01) out vec4 _texCoord0;

void main(void) {

    int instanceID = lightIndex[gl_InstanceID];
    Light light = getLight(instanceID);
    vec4 sphereVertex = inPosition;
    vec3 lightOrigin = getLightPosition(light);
    vec4 sphereParam = vec4(1.0); // = getLightVolumeGeometry(light);

    sphereVertex.xyz *= sphereParam.w;

    sphereVertex.xyz += lightOrigin;

    // standard transform
    TransformCamera cam = getTransformCamera();
    <$transformWorldToClipPos(cam, sphereVertex, gl_Position)$>;

    vec4 projected = gl_Position / gl_Position.w;
    projected.xy = (projected.xy + 1.0) * 0.5;

    projected.x = mix(projected.x, 0.5 * (projected.x + cam_getStereoSide()), float(cam_isStereo()));
    _texCoord0 = vec4(projected.xy, 0.0, 1.0) * gl_Position.w;
}