cesiumDemo/Source/Shaders/Builtin/Functions/vertexLogDepth.js

//This file is automatically rebuilt by the Cesium build process.
export default "#ifdef LOG_DEPTH\n\
varying float v_logZ;\n\
#ifdef SHADOW_MAP\n\
varying vec3 v_logPositionEC;\n\
#endif\n\
#endif\n\
void czm_updatePositionDepth() {\n\
#if defined(LOG_DEPTH) && !defined(DISABLE_GL_POSITION_LOG_DEPTH)\n\
vec3 logPositionEC = (czm_inverseProjection * gl_Position).xyz;\n\
#ifdef SHADOW_MAP\n\
v_logPositionEC = logPositionEC;\n\
#endif\n\
#ifdef ENABLE_GL_POSITION_LOG_DEPTH_AT_HEIGHT\n\
if (length(logPositionEC) < 2.0e6)\n\
{\n\
return;\n\
}\n\
#endif\n\
gl_Position.z = log2(max(1e-6, 1.0 + gl_Position.w)) * czm_log2FarDistance - 1.0;\n\
gl_Position.z *= gl_Position.w;\n\
#endif\n\
}\n\
void czm_vertexLogDepth()\n\
{\n\
#ifdef LOG_DEPTH\n\
v_logZ = 1.0 + gl_Position.w;\n\
czm_updatePositionDepth();\n\
#endif\n\
}\n\
void czm_vertexLogDepth(vec4 clipCoords)\n\
{\n\
#ifdef LOG_DEPTH\n\
v_logZ = 1.0 + clipCoords.w;\n\
czm_updatePositionDepth();\n\
#endif\n\
}\n\
";