OpenSpace/modules/globebrowsing/shaders/texturetile.hglsl

/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014                                                                    *
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#ifndef TEXTURETILE_HGLSL
#define TEXTURETILE_HGLSL

struct TileDepthTransform {
    float depthScale;
    float depthOffset;
};

struct TileUvTransform {
    vec2 uvOffset;
    vec2 uvScale;
};

struct TextureTile {
	sampler2D textureSampler;
	
	TileDepthTransform depthTransform;
	TileUvTransform uvTransform;
};

vec4 patchBorderOverlay(vec2 uv, vec3 borderColor, float borderSize) {
	vec2 uvOffset = uv - vec2(0.5);
	float thres = 0.5 - borderSize/2;
	bool isBorder = abs(uvOffset.x) > thres || abs(uvOffset.y) > thres;
	vec3 color = isBorder ? borderColor : vec3(0);
	return vec4(color, 0);
}

#endif // TEXTURETILE_HGLSL