OpenSpace/modules/globebrowsing/shaders/globalchunkedlodpatch_vs.glsl

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

uniform mat4 modelViewProjectionTransform;
uniform vec3 radiiSquared;

uniform vec2 minLatLon;
uniform vec2 lonLatScalingFactor;

uniform sampler2D textureSamplerHeight;
uniform vec2 heightSamplingScale;
uniform vec2 heightSamplingOffset;

layout(location = 1) in vec2 in_UV;

out vec4 vs_position;
out vec2 fs_uv;

#include "PowerScaling/powerScaling_vs.hglsl"
#include <${MODULE_GLOBEBROWSING}/shaders/ellipsoid.hglsl>

PositionNormalPair globalInterpolation() {
	vec2 lonLatInput;
	lonLatInput.y = minLatLon.y + lonLatScalingFactor.y * in_UV.y; // Lat
	lonLatInput.x = minLatLon.x + lonLatScalingFactor.x * in_UV.x; // Lon
	PositionNormalPair positionPairModelSpace = geodetic2ToCartesian(lonLatInput.y, lonLatInput.x, radiiSquared);
	return positionPairModelSpace;
}

void main()
{
	fs_uv = in_UV;
	PositionNormalPair pair = globalInterpolation();

	vec2 samplePos = heightSamplingScale*in_UV + heightSamplingOffset;
	float sampledHeight = texture(textureSamplerHeight, samplePos).r;
	pair.position += pair.normal * sampledHeight * pow(2,15);

	vec4 position = modelViewProjectionTransform * vec4(pair.position, 1);

	vs_position = z_normalization(position);
	gl_Position = vs_position;
}