/*

     File: reflect.vsh

 Abstract: The vertex shader for reflection rendering.

  Version: 1.8

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 */

#ifdef GL_ES

precision highp float;

#endif

uniform mat4 modelViewMatrix;

uniform mat4 modelViewProjectionMatrix;

uniform mat3 normalMatrix;

// Declare inputs and outputs

// inPosition : Position attribute from the VAO/VBOs

// inNormal : Normal attribute from the VAO/VBOs

// varNormal : Normalized normal value passed to the rasterizer and used

//             to compute the reflection texture coordinates the fragment shader

// verEyeDir : Direction of the eye is facing which we derive from the modelview

//              matrix.  This is passed to the rasterizer and used to compute

//              the reflection texture coordinate in the fragment shader

// gl_Position : Implicitly declared in all vertex shaders.  The clip space

//               position passed to rasterizer used to build the triangles

#if __VERSION__ >= 140

in vec3  inNormal;

in vec4  inPosition;

out vec3 varNormal;

out vec3 varEyeDir;

#else

attribute vec3 inNormal;

attribute vec4 inPosition;

varying vec3  varNormal;

varying vec3  varEyeDir;

#endif

void main (void)

{   

    gl_Position = modelViewProjectionMatrix * inPosition;

    vec4 eyePos = modelViewMatrix * inPosition;

    varNormal = normalize(normalMatrix * inNormal);

    varEyeDir = eyePos.xyz;

}