63 lines
1.4 KiB
Plaintext
63 lines
1.4 KiB
Plaintext
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#ifdef LOG_DEPTH
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varying float v_logZ;
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#ifdef SHADOW_MAP
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varying vec3 v_logPositionEC;
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#endif
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#endif
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void czm_updatePositionDepth() {
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#if defined(LOG_DEPTH) && !defined(DISABLE_GL_POSITION_LOG_DEPTH)
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vec3 logPositionEC = (czm_inverseProjection * gl_Position).xyz;
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#ifdef SHADOW_MAP
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v_logPositionEC = logPositionEC;
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#endif
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#ifdef ENABLE_GL_POSITION_LOG_DEPTH_AT_HEIGHT
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if (length(logPositionEC) < 2.0e6)
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{
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return;
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}
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#endif
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gl_Position.z = log2(max(1e-6, 1.0 + gl_Position.w)) * czm_log2FarDistance - 1.0;
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gl_Position.z *= gl_Position.w;
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#endif
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}
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/**
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* Writes the logarithmic depth to gl_Position using the already computed gl_Position.
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*
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* @name czm_vertexLogDepth
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* @glslFunction
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*/
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void czm_vertexLogDepth()
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{
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#ifdef LOG_DEPTH
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v_logZ = 1.0 + gl_Position.w;
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czm_updatePositionDepth();
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#endif
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}
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/**
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* Writes the logarithmic depth to gl_Position using the provided clip coordinates.
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* <p>
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* An example use case for this function would be moving the vertex in window coordinates
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* before converting back to clip coordinates. Use the original vertex clip coordinates.
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* </p>
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* @name czm_vertexLogDepth
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* @glslFunction
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*
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* @param {vec4} clipCoords The vertex in clip coordinates.
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*
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* @example
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* czm_vertexLogDepth(czm_projection * vec4(positionEyeCoordinates, 1.0));
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*/
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void czm_vertexLogDepth(vec4 clipCoords)
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{
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#ifdef LOG_DEPTH
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v_logZ = 1.0 + clipCoords.w;
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czm_updatePositionDepth();
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#endif
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}
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