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GS: Cleaned up and commented Motiond Adaptive Deinterlacing shader code
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GS: fixed compile error in Metal interlace shader
GS fixed more compile errors in Metal interlace shader
GS: Adjusted code indentation in interlace shader for all renderers
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@sideprojectslab @refractionpcsx2
sideprojectslab authored and refractionpcsx2 committed Nov 18, 2022
1 parent e9d256a commit 64f6bf5
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Showing 4 changed files with 441 additions and 363 deletions.
151 changes: 85 additions & 66 deletions bin/resources/shaders/dx11/interlace.fx
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Original file line number Diff line number Diff line change
Expand Up @@ -48,124 +48,143 @@ float4 ps_main3(PS_INPUT input) : SV_Target0

float4 ps_main4(PS_INPUT input) : SV_Target0
{
const int vres = int(round(ZrH.z));
const int idx = int(round(ZrH.x));
const int bank = idx >> 1;
const int field = idx & 1;
const int vpos = int(input.p.y) + (((((vres + 1) >> 1) << 1) - vres) & bank);
const float2 bofs = float2(0.0f, 0.5f * bank);
const float2 vscale = float2(1.0f, 2.0f);
const float2 optr = input.t - bofs;
const float2 iptr = optr * vscale;

if ((optr.y >= 0.0f) && (optr.y < 0.5f) && ((vpos & 1) == field))
// We take half the lines from the current frame and stores them in the MAD frame buffer.
// the MAD frame buffer is split in 2 consecutive banks of 2 fields each, the fields in each bank
// are interleaved (top field at even lines and bottom field at odd lines).
// When the source texture has an odd vres, the first line of bank 1 would be an odd index
// causing the wrong lines to be discarded, so a vertical offset (lofs) is added to the vertical
// position of the destination texture to force the proper field alignment

const int idx = int(ZrH.x); // buffer index passed from CPU
const int bank = idx >> 1; // current bank
const int field = idx & 1; // current field
const int vres = int(ZrH.z); // vertical resolution of source texture
const int lofs = ((((vres + 1) >> 1) << 1) - vres) & bank; // line alignment offset for bank 1
const int vpos = int(input.p.y) + lofs; // vertical position of destination texture
const float2 bofs = float2(0.0f, 0.5f * bank); // vertical offset of the current bank relative to source texture size
const float2 vscale = float2(1.0f, 2.0f); // scaling factor from source to destination texture
const float2 optr = input.t - bofs; // used to check if the current destination line is within the current bank
const float2 iptr = optr * vscale; // pointer to the current pixel in the source texture

// if the index of current destination line belongs to the current fiels we update it, otherwise
// we leave the old line in the destination buffer
if ((optr.y >= 0.0f) && (optr.y < 0.5f) && ((vpos & 1) == field))
return Texture.Sample(Sampler, iptr);
else
discard;

return float4(0.0f, 0.0f, 0.0f, 0.0f);

}


float4 ps_main5(PS_INPUT input) : SV_Target0
{
const float sensitivity = ZrH.w;
const float3 motion_thr = float3(1.0, 1.0, 1.0) * sensitivity;
const float2 vofs = float2(0.0f, 0.5f);
const float2 vscale = float2(1.0f, 0.5f);
const int idx = int(round(ZrH.x));
const int bank = idx >> 1;
const int field = idx & 1;
const float2 line_ofs = float2(0.0f, ZrH.y);
const float2 iptr = input.t * vscale;

float2 p_new_cf;
float2 p_old_cf;
float2 p_new_af;
float2 p_old_af;
// we use the contents of the MAD frame buffer to reconstruct the missing lines from the current
// field.

const int idx = int(round(ZrH.x)); // buffer index passed from CPU
const int bank = idx >> 1; // current bank
const int field = idx & 1; // current field
const int vpos = int(input.p.y); // vertical position of destination texture
const float sensitivity = ZrH.w; // passed from CPU, higher values mean more likely to use weave
const float3 motion_thr = float3(1.0, 1.0, 1.0) * sensitivity; //
const float2 bofs = float2(0.0f, 0.5f); // position of the bank 1 relative to source texture size
const float2 vscale = float2(1.0f, 0.5f); // scaling factor from source to destination texture
const float2 lofs = float2(0.0f, ZrH.y); // distance between two adjacent lines relative to source texture size
const float2 iptr = input.t * vscale; // pointer to the current pixel in the source texture

float2 p_t0; // pointer to current pixel (missing or not) from most recent frame
float2 p_t1; // pointer to current pixel (missing or not) from one frame back
float2 p_t2; // pointer to current pixel (missing or not) from two frames back
float2 p_t3; // pointer to current pixel (missing or not) from three frames back

switch (idx)
{
case 0:
p_new_cf = iptr;
p_new_af = iptr + vofs;
p_old_cf = iptr + vofs;
p_old_af = iptr;
p_t0 = iptr;
p_t1 = iptr + bofs;
p_t2 = iptr + bofs;
p_t3 = iptr;
break;
case 1:
p_new_cf = iptr;
p_new_af = iptr;
p_old_cf = iptr + vofs;
p_old_af = iptr + vofs;
p_t0 = iptr;
p_t1 = iptr;
p_t2 = iptr + bofs;
p_t3 = iptr + bofs;
break;
case 2:
p_new_cf = iptr + vofs;
p_new_af = iptr;
p_old_cf = iptr;
p_old_af = iptr + vofs;
p_t0 = iptr + bofs;
p_t1 = iptr;
p_t2 = iptr;
p_t3 = iptr + bofs;
break;
case 3:
p_new_cf = iptr + vofs;
p_new_af = iptr + vofs;
p_old_cf = iptr;
p_old_af = iptr;
p_t0 = iptr + bofs;
p_t1 = iptr + bofs;
p_t2 = iptr;
p_t3 = iptr;
break;
default:
break;
}

// calculating motion
// calculating motion, only relevant for missing lines where the "center line" is pointed
// by p_t1

float4 hn = Texture.Sample(Sampler, p_new_cf - line_ofs); // high
float4 cn = Texture.Sample(Sampler, p_new_af); // center
float4 ln = Texture.Sample(Sampler, p_new_cf + line_ofs); // low
float4 hn = Texture.Sample(Sampler, p_t0 - lofs); // new high pixel
float4 cn = Texture.Sample(Sampler, p_t1); // new center pixel
float4 ln = Texture.Sample(Sampler, p_t0 + lofs); // new low pixel

float4 ho = Texture.Sample(Sampler, p_old_cf - line_ofs); // high
float4 co = Texture.Sample(Sampler, p_old_af); // center
float4 lo = Texture.Sample(Sampler, p_old_cf + line_ofs); // low
float4 ho = Texture.Sample(Sampler, p_t2 - lofs); // old high pixel
float4 co = Texture.Sample(Sampler, p_t3); // old center pixel
float4 lo = Texture.Sample(Sampler, p_t2 + lofs); // old low pixel

float3 mh = hn.rgb - ho.rgb;
float3 mc = cn.rgb - co.rgb;
float3 ml = ln.rgb - lo.rgb;
float3 mh = hn.rgb - ho.rgb; // high pixel motion
float3 mc = cn.rgb - co.rgb; // center pixel motion
float3 ml = ln.rgb - lo.rgb; // low pixel motion

mh = max(mh, -mh) - motion_thr;
mc = max(mc, -mc) - motion_thr;
ml = max(ml, -ml) - motion_thr;


// float mh_max = max(max(mh.x, mh.y), mh.z);
// float mc_max = max(max(mc.x, mc.y), mc.z);
// float ml_max = max(max(ml.x, ml.y), ml.z);

float mh_max = mh.x + mh.y + mh.z;
float mc_max = mc.x + mc.y + mc.z;
float ml_max = ml.x + ml.y + ml.z;
#if 1 // use this code to evaluate each color motion separately
float mh_max = max(max(mh.x, mh.y), mh.z);
float mc_max = max(max(mc.x, mc.y), mc.z);
float ml_max = max(max(ml.x, ml.y), ml.z);
#else // use this code to evaluate average color motion
float mh_max = mh.x + mh.y + mh.z;
float mc_max = mc.x + mc.y + mc.z;
float ml_max = ml.x + ml.y + ml.z;
#endif

// selecting deinterlacing output

if (((int(input.p.y) & 1) == field)) // output coordinate present on current field
if ((vpos & 1) == field)
{
return Texture.Sample(Sampler, p_new_cf);
// output coordinate present on current field
return Texture.Sample(Sampler, p_t0);
}
else if ((iptr.y > 0.5f - line_ofs.y) || (iptr.y < 0.0 + line_ofs.y))
else if ((iptr.y > 0.5f - lofs.y) || (iptr.y < 0.0 + lofs.y))
{
return Texture.Sample(Sampler, p_new_af);
// top and bottom lines are always weaved
return cn;
}
else
{
// missing line needs to be reconstructed
if (((mh_max > 0.0f) || (ml_max > 0.0f)) || (mc_max > 0.0f))
{
// high motion -> interpolate pixels above and below
return (hn + ln) / 2.0f;
}
else
{
return Texture.Sample(Sampler, p_new_af);
// low motion -> weave
return cn;
}
}

return float4(0.0f, 0.0f, 0.0f, 0.0f);
}


#endif
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