OpenSpace/modules/globebrowsing/shaders/tilevertexheight.hglsl

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 *                                                                                       *
 * OpenSpace                                                                             *
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 * Copyright (c) 2014                                                                    *
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#ifndef TILE_VERTEX_HEIGHT_HGLSL
#define TILE_VERTEX_HEIGHT_HGLSL

#include "PowerScaling/powerScaling_vs.hglsl"

#include <${MODULE_GLOBEBROWSING}/shaders/tile.hglsl>


#if USE_HEIGHTMAP
uniform Tile HeightMaps[NUMLAYERS_HEIGHTMAP];
uniform Tile HeightMapsParent1[NUMLAYERS_HEIGHTMAP];
uniform Tile HeightMapsParent2[NUMLAYERS_HEIGHTMAP];
#endif // USE_HEIGHTMAP

#if USE_HEIGHTMAP_OVERLAY
uniform Tile HeightMapOverlays[NUMLAYERS_HEIGHTMAP_OVERLAY];
uniform Tile HeightMapOverlaysParent1[NUMLAYERS_HEIGHTMAP_OVERLAY];
uniform Tile HeightMapOverlaysParent2[NUMLAYERS_HEIGHTMAP_OVERLAY];
#endif // USE_HEIGHTMAP_OVERLAY

uniform int xSegments;
uniform float skirtLength;

uniform float distanceScaleFactor;
uniform int chunkLevel;


float getUntransformedTileVertexHeight(vec2 uv, LevelWeights levelWeights){
	float height = CHUNK_DEFAULT_HEIGHT;

#if USE_HEIGHTMAP
	// Calculate desired level based on distance to the vertex on the ellipsoid
    // Before any heightmapping is done
	height = calculateUntransformedHeight(
		uv,
		levelWeights, 							// Variable to determine which texture to sample from
		HeightMaps, HeightMapsParent1, HeightMapsParent2);	// Three textures to sample from

#endif // USE_HEIGHTMAP

#if USE_HEIGHTMAP_OVERLAY
	height = calculateUntransformedHeightOverlay(
		height,
		uv,
		levelWeights, 							// Variable to determine which texture to sample from
		HeightMapOverlays, HeightMapOverlaysParent1, HeightMapOverlaysParent2);	// Three textures to sample from

#endif // USE_HEIGHTMAP_OVERLAY

	return height;
}


float getTileVertexHeight(vec2 uv, LevelWeights levelWeights){
	float height = CHUNK_DEFAULT_HEIGHT;

#if USE_HEIGHTMAP
	// Calculate desired level based on distance to the vertex on the ellipsoid
    // Before any heightmapping is done
	height = calculateHeight(
		uv,
		levelWeights, 							// Variable to determine which texture to sample from
		HeightMaps, HeightMapsParent1, HeightMapsParent2);	// Three textures to sample from

#endif // USE_HEIGHTMAP

#if USE_HEIGHTMAP_OVERLAY
	height = calculateHeightOverlay(
		height,
		uv,
		levelWeights, 							// Variable to determine which texture to sample from
		HeightMapOverlays, HeightMapOverlaysParent1, HeightMapOverlaysParent2);	// Three textures to sample from

#endif // USE_HEIGHTMAP_OVERLAY

	return height;
}

bool tileVertexIsSkirtVertex(){
	int vertexIDx = gl_VertexID % (xSegments + 3);
	int vertexIDy = gl_VertexID / (xSegments + 3);
	return vertexIDx == 0 || vertexIDy == 0 ||
		vertexIDx == (xSegments + 2) || vertexIDy == (xSegments + 2);
}

float getTileVertexSkirtLength(){
	return tileVertexIsSkirtVertex() ? skirtLength : 0.0;
}

#endif // TILE_VERTEX_HEIGHT_HGLSL