7fadc438ec
This change also cleans up tone mapping and transfer functions by getting rid of unused code paths
56 lines
2.0 KiB
GLSL
56 lines
2.0 KiB
GLSL
//------------------------------------------------------------------------------
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// Conversion functions configuration
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//------------------------------------------------------------------------------
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// Defines the set of opto-electronic and electro-optical conversion functions
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#define CONVERSION_FUNCTION_LINEAR 0
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#define CONVERSION_FUNCTION_sRGB 1
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#define CONVERSION_FUNCTION_sRGB_FAST 2
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#if TONE_MAPPING_OPERATOR <= TONE_MAPPING_FILMIC_ALU
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#define CONVERSION_FUNCTION CONVERSION_FUNCTION_LINEAR
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#else
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#ifdef TARGET_MOBILE
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#define CONVERSION_FUNCTION CONVERSION_FUNCTION_sRGB_FAST
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#else
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#define CONVERSION_FUNCTION CONVERSION_FUNCTION_sRGB
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#endif
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#endif
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//------------------------------------------------------------------------------
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// Opto-electronic conversion functions (linear to non-linear)
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//------------------------------------------------------------------------------
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float OECF_sRGB(const float linear) {
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// IEC 61966-2-1:1999
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float sRGBLow = linear * 12.92;
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float sRGBHigh = (pow(linear, 1.0 / 2.4) * 1.055) - 0.055;
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return linear <= 0.0031308 ? sRGBLow : sRGBHigh;
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}
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vec3 OECF_sRGB(const vec3 linear) {
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return vec3(OECF_sRGB(linear.r), OECF_sRGB(linear.g), OECF_sRGB(linear.b));
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}
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vec3 OECF_sRGBFast(const vec3 linear) {
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return pow(linear, vec3(1.0 / 2.2));
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}
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//------------------------------------------------------------------------------
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// Conversion functions
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//------------------------------------------------------------------------------
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/**
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* Applies the opto-electronic conversion function to the specified LDR RGB
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* linear color and outputs an LDR RGB non-linear color in sRGB space.
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*/
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vec3 OECF(const vec3 linear) {
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#if CONVERSION_FUNCTION == CONVERSION_FUNCTION_LINEAR
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return linear;
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#elif CONVERSION_FUNCTION == CONVERSION_FUNCTION_sRGB
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return OECF_sRGB(linear);
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#elif CONVERSION_FUNCTION == CONVERSION_FUNCTION_sRGB_FAST
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return OECF_sRGBFast(linear);
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#endif
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}
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