color saturation filter in HLSL
Author
i cant translate this effect to the HLSL, plz help me
ps.1.1
def c0, 1.0, 1.0, 1.0, 1.0
def c1, 0.3, 0.59, 0.11, 0.5
tex t0 // sample the source image
mov_x4_sat r0.rgb, t0_bx2 // saturate
dp3_sat r1.rgba, r0, c0 // do we have any bright colors?
dp3 r1.rgb, t0, c1 // greyscale
lrp r0.rgb, r1.a, r0, r1 // interpolate between color and greyscale
+ mov r0.a, t0.a // output alpha
Never really worked with ps_1_1 asm, but from looking at the documentation I think the HLSL would look like this...
sampler2D texSampler : register (s0);static const float3 greyScaleConversion = {0.3f, 0.59f, 0.11f};float PS( in texCoord : TEXCOORD0 ) : COLOR0{ float4 sampleColor = tex2D(texSampler, texCoord) float3 saturated = clamp(sampleColor.rgb * 4.0f); float bright = saturate(saturated, float3(1, 1, 1)); float3 greyScale = dot(sampleColor.rgb, greyScaleConversion); float3 lerped = lerp(saturated, greyscale, bright); return float4(lerped, sampleColor.a);}
Quote:Original post by MJP
float3 saturated = clamp(sampleColor.rgb * 4.0f);
I think you need *8 - 4 to simulate the _BX2 modifier.
Quote:Original post by NamethatnobodyelsetookQuote:Original post by MJP
float3 saturated = clamp(sampleColor.rgb * 4.0f);
I think you need *8 - 4 to simulate the _BX2 modifier.
Shoot, you're right. Nice catch.
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