<@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 render-utils/ShaderConstants.h@>

<$declareStandardTransform()$>

// FIXME make into a uniform buffer or push constant if this shader ever comes into use
vec4 sphereParam = vec4(0.0);

layout(location=RENDER_UTILS_ATTR_TEXCOORD01) out vec4 _texCoord01;

void main(void) {
    if (sphereParam.w != 0.0) {
        
        // standard transform
        TransformCamera cam = getTransformCamera();
        TransformObject obj = getTransformObject();
        <$transformModelToClipPos(cam, obj, inPosition, gl_Position)$>;

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

#ifdef GPU_TRANSFORM_IS_STEREO
#ifdef GPU_TRANSFORM_STEREO_SPLIT_SCREEN
#else
        projected.x = mix(projected.x, 0.5 * (projected.x + cam_getStereoSide()), float(cam_isStereo()));
#endif
#endif
        _texCoord01 = vec4(projected.xy, 0.0, 1.0) * gl_Position.w;
    } else {
        const float depth = -1.0; //Draw at near plane
        const vec4 UNIT_QUAD[4] = vec4[4](
            vec4(-1.0, -1.0, depth, 1.0),
            vec4(1.0, -1.0, depth, 1.0),
            vec4(-1.0, 1.0, depth, 1.0),
            vec4(1.0, 1.0, depth, 1.0)
        );
        vec4 pos = UNIT_QUAD[gl_VertexID];


#ifdef GPU_TRANSFORM_IS_STEREO
#ifdef GPU_TRANSFORM_STEREO_SPLIT_SCREEN
        TransformCamera cam = getTransformCamera();
        <$transformStereoClipsSpace(cam, pos)$>
#endif
#endif

        _texCoord01 = vec4((pos.xy + 1.0) * 0.5, 0.0, 1.0);

#ifdef GPU_TRANSFORM_IS_STEREO
#ifdef GPU_TRANSFORM_STEREO_SPLIT_SCREEN
#else
        _texCoord01.x = mix(_texCoord01.x, 0.5 * (_texCoord01.x + cam_getStereoSide()), float(cam_isStereo()));
#endif
#endif

        gl_Position = pos;

    }

}