72 lines
2.2 KiB
GLSL
72 lines
2.2 KiB
GLSL
/**
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* Branchless ternary operator to be used when it's inexpensive to explicitly
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* evaluate both possibilities for a float expression.
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*
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* @name czm_branchFreeTernary
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* @glslFunction
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*
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* @param {bool} comparison A comparison statement
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* @param {float} a Value to return if the comparison is true.
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* @param {float} b Value to return if the comparison is false.
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*
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* @returns {float} equivalent of comparison ? a : b
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*/
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float czm_branchFreeTernary(bool comparison, float a, float b) {
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float useA = float(comparison);
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return a * useA + b * (1.0 - useA);
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}
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/**
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* Branchless ternary operator to be used when it's inexpensive to explicitly
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* evaluate both possibilities for a vec2 expression.
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*
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* @name czm_branchFreeTernary
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* @glslFunction
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*
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* @param {bool} comparison A comparison statement
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* @param {vec2} a Value to return if the comparison is true.
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* @param {vec2} b Value to return if the comparison is false.
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*
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* @returns {vec2} equivalent of comparison ? a : b
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*/
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vec2 czm_branchFreeTernary(bool comparison, vec2 a, vec2 b) {
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float useA = float(comparison);
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return a * useA + b * (1.0 - useA);
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}
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/**
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* Branchless ternary operator to be used when it's inexpensive to explicitly
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* evaluate both possibilities for a vec3 expression.
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*
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* @name czm_branchFreeTernary
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* @glslFunction
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*
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* @param {bool} comparison A comparison statement
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* @param {vec3} a Value to return if the comparison is true.
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* @param {vec3} b Value to return if the comparison is false.
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*
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* @returns {vec3} equivalent of comparison ? a : b
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*/
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vec3 czm_branchFreeTernary(bool comparison, vec3 a, vec3 b) {
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float useA = float(comparison);
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return a * useA + b * (1.0 - useA);
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}
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/**
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* Branchless ternary operator to be used when it's inexpensive to explicitly
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* evaluate both possibilities for a vec4 expression.
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*
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* @name czm_branchFreeTernary
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* @glslFunction
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*
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* @param {bool} comparison A comparison statement
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* @param {vec3} a Value to return if the comparison is true.
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* @param {vec3} b Value to return if the comparison is false.
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*
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* @returns {vec3} equivalent of comparison ? a : b
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*/
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vec4 czm_branchFreeTernary(bool comparison, vec4 a, vec4 b) {
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float useA = float(comparison);
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return a * useA + b * (1.0 - useA);
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}
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