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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 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | //This file is automatically rebuilt by the Cesium build process.
export default "vec4 czm_screenToEyeCoordinates(vec4 screenCoordinate)\n\
{\n\
// Reconstruct NDC coordinates\n\
float x = 2.0 * screenCoordinate.x - 1.0;\n\
float y = 2.0 * screenCoordinate.y - 1.0;\n\
float z = (screenCoordinate.z - czm_viewportTransformation[3][2]) / czm_viewportTransformation[2][2];\n\
vec4 q = vec4(x, y, z, 1.0);\n\
\n\
// Reverse the perspective division to obtain clip coordinates.\n\
q /= screenCoordinate.w;\n\
\n\
// Reverse the projection transformation to obtain eye coordinates.\n\
if (!(czm_inverseProjection == mat4(0.0))) // IE and Edge sometimes do something weird with != between mat4s\n\
{\n\
q = czm_inverseProjection * q;\n\
}\n\
else\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\
float near = czm_currentFrustum.x;\n\
float far = czm_currentFrustum.y;\n\
\n\
q.x = (q.x * (right - left) + left + right) * 0.5;\n\
q.y = (q.y * (top - bottom) + bottom + top) * 0.5;\n\
q.z = (q.z * (near - far) - near - far) * 0.5;\n\
q.w = 1.0;\n\
}\n\
\n\
return q;\n\
}\n\
\n\
/**\n\
* Transforms a position from window to eye coordinates.\n\
* The transform from window to normalized device coordinates is done using components\n\
* of (@link czm_viewport} and {@link czm_viewportTransformation} instead of calculating\n\
* the inverse of <code>czm_viewportTransformation</code>. The transformation from\n\
* normalized device coordinates to clip coordinates is done using <code>fragmentCoordinate.w</code>,\n\
* which is expected to be the scalar used in the perspective divide. The transformation\n\
* from clip to eye coordinates is done using {@link czm_inverseProjection}.\n\
*\n\
* @name czm_windowToEyeCoordinates\n\
* @glslFunction\n\
*\n\
* @param {vec4} fragmentCoordinate The position in window coordinates to transform.\n\
*\n\
* @returns {vec4} The transformed position in eye coordinates.\n\
*\n\
* @see czm_modelToWindowCoordinates\n\
* @see czm_eyeToWindowCoordinates\n\
* @see czm_inverseProjection\n\
* @see czm_viewport\n\
* @see czm_viewportTransformation\n\
*\n\
* @example\n\
* vec4 positionEC = czm_windowToEyeCoordinates(gl_FragCoord);\n\
*/\n\
vec4 czm_windowToEyeCoordinates(vec4 fragmentCoordinate)\n\
{\n\
vec2 screenCoordXY = (fragmentCoordinate.xy - czm_viewport.xy) / czm_viewport.zw;\n\
return czm_screenToEyeCoordinates(vec4(screenCoordXY, fragmentCoordinate.zw));\n\
}\n\
\n\
vec4 czm_screenToEyeCoordinates(vec2 screenCoordinateXY, float depthOrLogDepth)\n\
{\n\
// See reverseLogDepth.glsl. This is separate to re-use the pow.\n\
#if defined(LOG_DEPTH) || defined(LOG_DEPTH_READ_ONLY)\n\
float near = czm_currentFrustum.x;\n\
float far = czm_currentFrustum.y;\n\
float log2Depth = depthOrLogDepth * czm_log2FarDepthFromNearPlusOne;\n\
float depthFromNear = exp2(log2Depth) - 1.0;\n\
float depthFromCamera = depthFromNear + near;\n\
vec4 screenCoord = vec4(screenCoordinateXY, far * (1.0 - near / depthFromCamera) / (far - near), 1.0);\n\
vec4 eyeCoordinate = czm_screenToEyeCoordinates(screenCoord);\n\
eyeCoordinate.w = 1.0 / depthFromCamera; // Better precision\n\
#else\n\
vec4 screenCoord = vec4(screenCoordinateXY, depthOrLogDepth, 1.0);\n\
vec4 eyeCoordinate = czm_screenToEyeCoordinates(screenCoord);\n\
#endif\n\
return eyeCoordinate;\n\
}\n\
\n\
/**\n\
* Transforms a position given as window x/y and a depth or a log depth from window to eye coordinates.\n\
* This function produces more accurate results for window positions with log depth than\n\
* conventionally unpacking the log depth using czm_reverseLogDepth and using the standard version\n\
* of czm_windowToEyeCoordinates.\n\
*\n\
* @name czm_windowToEyeCoordinates\n\
* @glslFunction\n\
*\n\
* @param {vec2} fragmentCoordinateXY The XY position in window coordinates to transform.\n\
* @param {float} depthOrLogDepth A depth or log depth for the fragment.\n\
*\n\
* @see czm_modelToWindowCoordinates\n\
* @see czm_eyeToWindowCoordinates\n\
* @see czm_inverseProjection\n\
* @see czm_viewport\n\
* @see czm_viewportTransformation\n\
*\n\
* @returns {vec4} The transformed position in eye coordinates.\n\
*/\n\
vec4 czm_windowToEyeCoordinates(vec2 fragmentCoordinateXY, float depthOrLogDepth)\n\
{\n\
vec2 screenCoordXY = (fragmentCoordinateXY.xy - czm_viewport.xy) / czm_viewport.zw;\n\
return czm_screenToEyeCoordinates(screenCoordXY, depthOrLogDepth);\n\
}\n\
";
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