OpenSpace/modules/globebrowsing/shaders/multipletexturestest_vs.glsl

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

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

#define NUMLAYERS_COLORTEXTURE #{numLayersColor}
#define NUMLAYERS_HEIGHTMAP #{numLayersHeight}

uniform mat4 modelViewProjectionTransform;
uniform vec3 radiiSquared;

uniform vec2 minLatLon;
uniform vec2 lonLatScalingFactor;

uniform TextureTile heightTiles[NUMLAYERS_HEIGHTMAP];

layout(location = 1) in vec2 in_uv;

out vec2 fs_uv;
out vec4 fs_position;

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()
{
	PositionNormalPair pair = globalInterpolation();

	float height = 0;
	for (int i = 0; i < NUMLAYERS_HEIGHTMAP; ++i)
	{
		vec2 samplePos =
			heightTiles[i].uvTransform.uvScale * in_uv +
			heightTiles[i].uvTransform.uvOffset;

		float sampledValue = texture(heightTiles[i].textureSampler, samplePos).r;
		
		// TODO : Some kind of blending here. Now it just writes over
		height = (sampledValue *
			heightTiles[i].depthTransform.depthScale +
			heightTiles[i].depthTransform.depthOffset);
	}

	// Add the height in the direction of the normal
	pair.position += pair.normal * height;

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

	// Write output
	fs_uv = in_uv;
	fs_position = z_normalization(position);
	gl_Position = fs_position;
}