OpenSpace/modules/base/shaders/nighttexture_vs.glsl

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 * OpenSpace                                                                             *
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 * Copyright (c) 2014                                                                    *
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#version __CONTEXT__

#include "PowerScaling/powerScaling_vs.hglsl"


layout(location = 0) in vec4 in_position;
layout(location = 1) in vec2 in_st;
layout(location = 2) in vec3 in_normal;
//layout(location = 3) in vec2 in_nightTex;

out vec2 vs_st;
out vec4 vs_normal;
out vec4 vs_position;

uniform mat4 ViewProjection;
uniform mat4 ModelTransform;

uniform sampler2D heightTex;
uniform bool _hasHeightMap;
uniform float _heightExaggeration;


void main()
{
    // set variables
    vs_st = in_st;
    vs_position = in_position;
    vec4 tmp = in_position;

    // this is wrong for the normal. The normal transform is the transposed inverse of the model transform
    vs_normal = normalize(ModelTransform * vec4(in_normal,0));
    // vs_normal = vec4(in_normal, 0.0);
    
    vec4 position = pscTransform(tmp, ModelTransform);
    vs_position = tmp;

    if (_hasHeightMap) {
        float height = texture(heightTex, in_st).r;
        vec3 displacementDirection = abs(normalize(in_normal.xyz));
        float displacementFactor = height * _heightExaggeration;
        position.xyz = position.xyz + displacementDirection * displacementFactor;
    }
// 
    position = ViewProjection * position;

    gl_Position =  z_normalization(position);
}