OpenSpace/modules/space/shaders/renderableplanet_vs.glsl

/*****************************************************************************************
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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2018                                                               *
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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;

out vec2 vs_st;
out vec4 vs_normal;
out vec4 vs_position;
out vec4 vs_gPosition;
out vec3 vs_gNormal;

uniform mat4 ModelTransform;
uniform dmat4 modelViewTransform;
uniform mat4 modelViewProjectionTransform;

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

void main() {
    vs_st = in_st;
    
    // G-Buffer
    vs_gNormal = in_normal;

    // 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 = vec4(in_position.xyz * pow(10, in_position.w), 1.0);

    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;
    }

    // G-Buffer
    vs_gPosition = vec4(modelViewTransform * position); // Must be in SGCT eye space;

    position = modelViewProjectionTransform * position;
    
    vs_position = z_normalization(position);

    gl_Position =  vs_position;
}