OpenSpace/modules/globebrowsing/shaders/multipletexturestest_fs.glsl

/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014                                                                    *
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 * The above copyright notice and this permission notice shall be included in all copies *
 * or substantial portions of the Software.                                              *
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#include <${MODULE_GLOBEBROWSING}/shaders/texturetile.hglsl>
#include "PowerScaling/powerScaling_fs.hglsl"
#include "fragment.glsl"

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

uniform TextureTile colorTiles[NUMLAYERS_COLORTEXTURE];

in vec4 fs_position;
in vec2 fs_uv;

vec4 blendOver(vec4 oldColor, vec4 newColor)
{
	vec4 toReturn;
	toReturn.rgb =
		(newColor.rgb * newColor.a + oldColor.rgb * oldColor.a * (1 - newColor.a)) /
		(newColor.a + oldColor.a * (1 - newColor.a));
	toReturn.a = newColor.a + oldColor.a * (1 - newColor.a);
	return toReturn;
}

Fragment getFragment() {
	Fragment frag;

	for (int i = 0; i < NUMLAYERS_COLORTEXTURE; ++i)
	{
		vec2 samplePos =
		colorTile.uvTransform.uvScale * fs_uv +
		colorTile.uvTransform.uvOffset;
		vec4 colorSample = texture(colorTile.textureSampler, samplePos);
		frag.color = blendOver(frag.color, colorSample);
	}
	
	//frag.color.rgb *= 10;

	// Sample position overlay
	//frag.color = frag.color * 0.9 + 0.2*vec4(samplePos, 0, 1);

	// Border overlay
	//frag.color = frag.color + patchBorderOverlay(fs_uv, vec3(0.5, 0.5, 0.5), 0.02);

	frag.depth = fs_position.w;

	return frag;
}