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Emulator Issues #12725 » integerYbilinearX.glsl

taolas, 06/05/2022 10:16 PM

 
void main()
{
float4 c0 = Sample();
float2 rat = GetWindowResolution()/GetResolution();
float x = GetWindowResolution().x - GetResolution().x;
float y = GetWindowResolution().y - GetResolution().y;
float x1 = (x / 2.0) * GetInvWindowResolution().x;
float x2 = (GetWindowResolution().x - x / 2.0) * GetInvWindowResolution().x;
float y1 = (y / 2.0) * GetInvWindowResolution().y;
float y2 = (GetWindowResolution().y - y / 2.0) * GetInvWindowResolution().y;

float source_size = GetResolution().x;
float texel = GetCoordinates().x * source_size.x;
float texel_floored = floor(texel);
float s = fract(texel);
//float config_scale = 0.0; // GetOption(PRESCALE_FACTOR);
float scale = ceil(GetWindowResolution().x / source_size.x);
float region_range = 0.5 - 0.5 / scale;

// Figure out where in the texel to sample to get correct pre-scaled bilinear.
// Uses the hardware bilinear interpolator to avoid having to sample 4 times manually.

float center_dist = s - 0.5;
float f = (center_dist - clamp(center_dist, -region_range, region_range)) * scale + 0.5;

float mod_texel = texel_floored + f;
float xloc = mod_texel / source_size;

if (GetCoordinates().y < y1 || y2 < GetCoordinates().y)
{
c0.r = 0.0;
c0.b = 0.0;
c0.g = 0.0;
}
else
{
float2 offset = float2(xloc, (GetCoordinates().y * rat.y - y1 * rat.y));
c0 = SampleLocation(offset);
}
SetOutput(c0);
}
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