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VideoSoftware: Implement xfb copy filter (Deflickering/Brightness)

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This commit is contained in:
Scott Mansell
2016-05-18 08:21:02 +12:00
committed by Stenzek
parent 0cd46f4d21
commit fc96479f12
5 changed files with 116 additions and 37 deletions
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64
Source/Core/VideoBackends/Software/EfbInterface.cpp
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@ -469,10 +469,42 @@ u32 GetColor(u16 x, u16 y)
return GetPixelColor(offset);
}
// For internal used only, return a non-normalized value, which saves work later.
yuv444 GetColorYUV(u16 x, u16 y)
static u32 VerticalFilter(const std::array<u32, 3>& colors,
const std::array<u8, 7>& filterCoefficients)
{
u8 in_colors[3][4];
std::memcpy(&in_colors, colors.data(), sizeof(in_colors));
// Alpha channel is not used
u8 out_color[4];
out_color[ALP_C] = 0;
// All Coefficients should sum to 64, otherwise the total brightness will change, which many games
// do on purpose to implement a brightness filter across the whole copy.
for (int i = BLU_C; i <= RED_C; i++)
{
// TODO: implement support for multisampling.
// In non-multisampling mode:
// * Coefficients 2, 3 and 4 sample from the current pixel.
// * Coefficients 0 and 1 sample from the pixel above this one
// * Coefficients 5 and 6 sample from the pixel below this one
int sum =
in_colors[0][i] * (filterCoefficients[0] + filterCoefficients[1]) +
in_colors[1][i] * (filterCoefficients[2] + filterCoefficients[3] + filterCoefficients[4]) +
in_colors[2][i] * (filterCoefficients[5] + filterCoefficients[6]);
// TODO: this clamping behavior appears to be correct, but isn't confirmed on hardware.
out_color[i] = std::min(255, sum >> 6); // clamp larger values to 255
}
u32 out_color32;
std::memcpy(&out_color32, out_color, sizeof(out_color32));
return out_color32;
}
// For internal used only, return a non-normalized value, which saves work later.
static yuv444 ConvertColorToYUV(u32 color)
{
const u32 color = GetColor(x, y);
const u8 red = static_cast<u8>(color >> 24);
const u8 green = static_cast<u8>(color >> 16);
const u8 blue = static_cast<u8>(color >> 8);
@ -497,7 +529,9 @@ u8* GetPixelPointer(u16 x, u16 y, bool depth)
return &efb[GetColorOffset(x, y)];
}
void EncodeXFB(u8* xfb_in_ram, u32 memory_stride, const EFBRectangle& source_rect, float y_scale)
void EncodeXFB(u8* xfb_in_ram, u32 memory_stride, const EFBRectangle& source_rect, float y_scale,
bool clamp_top, bool clamp_bottom, float Gamma,
const std::array<u8, 7>& filterCoefficients)
{
if (!xfb_in_ram)
{
@ -523,13 +557,29 @@ void EncodeXFB(u8* xfb_in_ram, u32 memory_stride, const EFBRectangle& source_rec
source.resize(EFB_WIDTH * EFB_HEIGHT);
yuv422_packed* src_ptr = &source[0];
for (float y = source_rect.top; y < source_rect.bottom; y++)
for (int y = source_rect.top; y < source_rect.bottom; y++)
{
// Get a scanline of YUV pixels in 4:4:4 format
// Clamping behavior
// NOTE: when the clamp bits aren't set, the hardware will happily read beyond the EFB,
// which returns random garbage from the empty bus (confirmed by hardware tests).
//
// In our implementation, the garbage just so happens to be the top or bottom row.
// Statistically, that could happen.
u16 y_prev = static_cast<u16>(std::max(clamp_top ? source_rect.top : 0, y - 1));
u16 y_next = static_cast<u16>(std::min(clamp_bottom ? source_rect.bottom : EFB_HEIGHT, y + 1));
// Get a scanline of YUV pixels in 4:4:4 format
for (int i = 1, x = left; x < right; i++, x++)
{
scanline[i] = GetColorYUV(x, y);
// Get RGB colors
std::array<u32, 3> colors = {{GetColor(x, y_prev), GetColor(x, y), GetColor(x, y_next)}};
// Vertical Filter (Multisampling resolve, deflicker, brightness)
u32 filtered = VerticalFilter(colors, filterCoefficients);
// TODO: Gamma correction happens here.
scanline[i] = ConvertColorToYUV(filtered);
}
// Flipper clamps the border colors