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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | //This file is automatically rebuilt by the Cesium build process.
export default "/**\n\
* Computes the size of a pixel in meters at a distance from the eye.\n\
* <p>\n\
* Use this version when passing in a custom pixel ratio. For example, passing in 1.0 will return meters per native device pixel.\n\
* </p>\n\
* @name czm_metersPerPixel\n\
* @glslFunction\n\
*\n\
* @param {vec3} positionEC The position to get the meters per pixel in eye coordinates.\n\
* @param {float} pixelRatio The scaling factor from pixel space to coordinate space\n\
*\n\
* @returns {float} The meters per pixel at positionEC.\n\
*/\n\
float czm_metersPerPixel(vec4 positionEC, float pixelRatio)\n\
{\n\
float width = czm_viewport.z;\n\
float height = czm_viewport.w;\n\
float pixelWidth;\n\
float pixelHeight;\n\
\n\
float top = czm_frustumPlanes.x;\n\
float bottom = czm_frustumPlanes.y;\n\
float left = czm_frustumPlanes.z;\n\
float right = czm_frustumPlanes.w;\n\
\n\
if (czm_sceneMode == czm_sceneMode2D || czm_orthographicIn3D == 1.0)\n\
{\n\
float frustumWidth = right - left;\n\
float frustumHeight = top - bottom;\n\
pixelWidth = frustumWidth / width;\n\
pixelHeight = frustumHeight / height;\n\
}\n\
else\n\
{\n\
float distanceToPixel = -positionEC.z;\n\
float inverseNear = 1.0 / czm_currentFrustum.x;\n\
float tanTheta = top * inverseNear;\n\
pixelHeight = 2.0 * distanceToPixel * tanTheta / height;\n\
tanTheta = right * inverseNear;\n\
pixelWidth = 2.0 * distanceToPixel * tanTheta / width;\n\
}\n\
\n\
return max(pixelWidth, pixelHeight) * pixelRatio;\n\
}\n\
\n\
/**\n\
* Computes the size of a pixel in meters at a distance from the eye.\n\
* <p>\n\
* Use this version when scaling by pixel ratio.\n\
* </p>\n\
* @name czm_metersPerPixel\n\
* @glslFunction\n\
*\n\
* @param {vec3} positionEC The position to get the meters per pixel in eye coordinates.\n\
*\n\
* @returns {float} The meters per pixel at positionEC.\n\
*/\n\
float czm_metersPerPixel(vec4 positionEC)\n\
{\n\
return czm_metersPerPixel(positionEC, czm_pixelRatio);\n\
}\n\
";
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