diff options
Diffstat (limited to 'hlsl/phosphor.fx')
-rw-r--r-- | hlsl/phosphor.fx | 46 |
1 files changed, 21 insertions, 25 deletions
diff --git a/hlsl/phosphor.fx b/hlsl/phosphor.fx index 579a110eb6d..2505b27e17f 100644 --- a/hlsl/phosphor.fx +++ b/hlsl/phosphor.fx @@ -1,5 +1,5 @@ // license:BSD-3-Clause -// copyright-holders:Ryan Holtz +// copyright-holders:Ryan Holtz, Westley M. Martinez //----------------------------------------------------------------------------- // Phosphor Effect //----------------------------------------------------------------------------- @@ -95,12 +95,14 @@ VS_OUTPUT vs_main(VS_INPUT Input) // Phosphor Pixel Shader //----------------------------------------------------------------------------- -uniform bool LCD = false; uniform int Mode = 0; uniform float DeltaTime = 0.0f; -uniform float LCDTau = 0.0f; uniform float3 TimeConstant = { 0.0f, 0.0f, 0.0f }; uniform float3 Beta = { 0.0f, 0.0f, 0.0f }; +static const float TAU_FACTOR = 0.4342944819; +static const float GAMMA_INV_FACTOR = TAU_FACTOR / 100; +// sRGB half-step for small intensities +float THRESHOLD = 0.5f / 255.0f / 12.92f; float4 ps_main(PS_INPUT Input) : COLOR { @@ -110,47 +112,41 @@ float4 ps_main(PS_INPUT Input) : COLOR float g = PrevPix.g; float b = PrevPix.b; - if (LCD) { - r *= LCDTau == 0 ? 0 : exp(-DeltaTime / LCDTau); - g *= LCDTau == 0 ? 0 : exp(-DeltaTime / LCDTau); - b *= LCDTau == 0 ? 0 : exp(-DeltaTime / LCDTau); - } - else if (Mode == 0) { + if (Mode == 0) { r = 0; g = 0; b = 0; } else if (Mode == 1) { - float3 tau = TimeConstant * 0.4342944819; + float3 tau = TimeConstant * TAU_FACTOR; r *= tau.r == 0 ? 0 : exp(-DeltaTime / tau.r); g *= tau.g == 0 ? 0 : exp(-DeltaTime / tau.g); b *= tau.b == 0 ? 0 : exp(-DeltaTime / tau.b); } else { - float3 gamma = 1 / (TimeConstant * 0.004342944819); + float3 gamma = 1 / (TimeConstant * GAMMA_INV_FACTOR); if (r != 0.0f) - r = pow(gamma.r * DeltaTime + pow(1 / r, 1 / Beta.r), -Beta.r); + r = pow(gamma.r * DeltaTime + pow(1 / r, 1 / Beta.r), + -Beta.r); if (g != 0.0f) - g = pow(gamma.g * DeltaTime + pow(1 / g, 1 / Beta.g), -Beta.g); + g = pow(gamma.g * DeltaTime + pow(1 / g, 1 / Beta.g), + -Beta.g); if (b != 0.0f) - b = pow(gamma.b * DeltaTime + pow(1 / b, 1 / Beta.b), -Beta.b); + b = pow(gamma.b * DeltaTime + pow(1 / b, 1 / Beta.b), + -Beta.b); } // Prevent burn-in if (DeltaTime > 0.0f) { - float threshold = 0.5f / 255.0f / 12.92; // Half-color increment - r = max(0.0f, r - threshold); - g = max(0.0f, g - threshold); - b = max(0.0f, b - threshold); + r = max(0.0f, r - THRESHOLD); + g = max(0.0f, g - THRESHOLD); + b = max(0.0f, b - THRESHOLD); } - - float RedMax = max(CurrPix.r, r); - float GreenMax = max(CurrPix.g, g); - float BlueMax = max(CurrPix.b, b); - - return Passthrough ? - CurrPix : float4(RedMax, GreenMax, BlueMax, CurrPix.a); + r = max(CurrPix.r, r); + g = max(CurrPix.g, g); + b = max(CurrPix.b, b); + return Passthrough ? CurrPix : float4(r, g, b, CurrPix.a); } //----------------------------------------------------------------------------- |