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GPU: Implement dithering on software backend

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This commit is contained in:
Connor McLaughlin 2019-11-01 23:11:37 +10:00
parent ac82383abe
commit 3aa4219067
3 changed files with 25 additions and 9 deletions
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9
src/core/gpu.h
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@ -243,6 +243,15 @@ protected:
(static_cast<u16>(c_) << 15);
}
void SetRGB24Dithered(u32 x, u32 y, u8 r8, u8 g8, u8 b8, bool c_ = false)
{
const s32 offset = DITHER_MATRIX[y & 3][x & 3];
r8 = static_cast<u8>(std::clamp<s32>(static_cast<s32>(ZeroExtend32(r8)) + offset, 0, 255));
g8 = static_cast<u8>(std::clamp<s32>(static_cast<s32>(ZeroExtend32(g8)) + offset, 0, 255));
b8 = static_cast<u8>(std::clamp<s32>(static_cast<s32>(ZeroExtend32(b8)) + offset, 0, 255));
SetRGB24(r8, g8, b8, c_);
}
u32 ToRGB24() const
{
const u32 r_ = ZeroExtend32(r.GetValue());

21
src/core/gpu_sw.cpp
View file

@ -357,7 +357,8 @@ void GPU_SW::DrawTriangle(RenderCommand rc, const SWVertex* v0, const SWVertex*
const u8 texcoord_x = Interpolate(v0->texcoord_x, v1->texcoord_x, v2->texcoord_x, b0, b1, b2, ws);
const u8 texcoord_y = Interpolate(v0->texcoord_y, v1->texcoord_y, v2->texcoord_y, b0, b1, b2, ws);
ShadePixel(rc, static_cast<u32>(x), static_cast<u32>(y), r, g, b, texcoord_x, texcoord_y);
ShadePixel(rc, static_cast<u32>(x), static_cast<u32>(y), r, g, b, texcoord_x, texcoord_y,
rc.IsDitheringEnabled() && m_GPUSTAT.dither_enable);
}
row_w0 += a12;
@ -395,13 +396,13 @@ void GPU_SW::DrawRectangle(RenderCommand rc, s32 origin_x, s32 origin_y, u32 wid
const u8 texcoord_x = Truncate8(ZeroExtend32(origin_texcoord_x) + offset_x);
ShadePixel(rc, static_cast<u32>(x), static_cast<u32>(y), r, g, b, texcoord_x, texcoord_y);
ShadePixel(rc, static_cast<u32>(x), static_cast<u32>(y), r, g, b, texcoord_x, texcoord_y, false);
}
}
}
void GPU_SW::ShadePixel(RenderCommand rc, u32 x, u32 y, u8 color_r, u8 color_g, u8 color_b, u8 texcoord_x,
u8 texcoord_y)
u8 texcoord_y, bool dithering)
{
VRAMPixel color;
bool transparent = true;
@ -461,14 +462,20 @@ void GPU_SW::ShadePixel(RenderCommand rc, u32 x, u32 y, u8 color_r, u8 color_g,
}
else
{
color.SetRGB24(
Truncate8(std::min<u16>((ZeroExtend16(texture_color.GetR8()) * ZeroExtend16(color_r)) >> 7, 0xFF)),
Truncate8(std::min<u16>((ZeroExtend16(texture_color.GetG8()) * ZeroExtend16(color_g)) >> 7, 0xFF)),
Truncate8(std::min<u16>((ZeroExtend16(texture_color.GetB8()) * ZeroExtend16(color_b)) >> 7, 0xFF)));
const u8 r = Truncate8(std::min<u16>((ZeroExtend16(texture_color.GetR8()) * ZeroExtend16(color_r)) >> 7, 0xFF));
const u8 g = Truncate8(std::min<u16>((ZeroExtend16(texture_color.GetG8()) * ZeroExtend16(color_g)) >> 7, 0xFF));
const u8 b = Truncate8(std::min<u16>((ZeroExtend16(texture_color.GetB8()) * ZeroExtend16(color_b)) >> 7, 0xFF));
if (dithering)
color.SetRGB24Dithered(x, y, r, g, b);
else
color.SetRGB24(r, g, b);
}
}
else
{
if (dithering)
color.SetRGB24Dithered(x, y, color_r, color_g, color_b);
else
color.SetRGB24(color_r, color_g, color_b);
}

2
src/core/gpu_sw.h
View file

@ -58,7 +58,7 @@ protected:
static bool IsClockwiseWinding(const SWVertex* v0, const SWVertex* v1, const SWVertex* v2);
void ShadePixel(RenderCommand rc, u32 x, u32 y, u8 color_r, u8 color_g, u8 color_b, u8 texcoord_x, u8 texcoord_y);
void ShadePixel(RenderCommand rc, u32 x, u32 y, u8 color_r, u8 color_g, u8 color_b, u8 texcoord_x, u8 texcoord_y, bool dithering);
void DrawTriangle(RenderCommand rc, const SWVertex* v0, const SWVertex* v1, const SWVertex* v2);
void DrawRectangle(RenderCommand rc, s32 origin_x, s32 origin_y, u32 width, u32 height, u8 r, u8 g, u8 b,
u8 origin_texcoord_x, u8 origin_texcoord_y);