diff options
| author | StapleButter <thetotalworm@gmail.com> | 2018-12-13 22:46:12 +0100 |
|---|---|---|
| committer | StapleButter <thetotalworm@gmail.com> | 2018-12-13 22:46:12 +0100 |
| commit | 68d5e3c782cb088d0edff9cefe1857c347805b16 (patch) | |
| tree | cf5e6c32e3b86bd25fde682660bc0a2676052cc6 /src | |
| parent | 32392cc8e2eb30d05683d8997bc06194ddfac856 (diff) | |
3D: in Z-buffering mode, margin for 'equal' depth test mode is +-0x200, not +-0xFF
fixes #274
Diffstat (limited to 'src')
| -rw-r--r-- | src/GPU3D_Soft.cpp | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/src/GPU3D_Soft.cpp b/src/GPU3D_Soft.cpp index 811d5f6..daf5cdd 100644 --- a/src/GPU3D_Soft.cpp +++ b/src/GPU3D_Soft.cpp @@ -769,11 +769,24 @@ void TextureLookup(u32 texparam, u32 texpal, s16 s, s16 t, u16* color, u8* alpha // depth test is 'less or equal' instead of 'less than' under the following conditions: // * when drawing a front-facing pixel over an opaque back-facing pixel // * when drawing wireframe edges, under certain conditions (TODO) +// +// range is different based on depth-buffering mode +// Z-buffering: +-0x200 +// W-buffering: +-0xFF + +bool DepthTest_Equal_Z(s32 dstz, s32 z, u32 dstattr) +{ + s32 diff = dstz - z; + if ((u32)(diff + 0x200) <= 0x400) + return true; + + return false; +} -bool DepthTest_Equal(s32 dstz, s32 z, u32 dstattr) +bool DepthTest_Equal_W(s32 dstz, s32 z, u32 dstattr) { s32 diff = dstz - z; - if ((u32)(diff + 0xFF) <= 0x1FE) // range is +-0xFF + if ((u32)(diff + 0xFF) <= 0x1FE) return true; return false; @@ -1099,7 +1112,7 @@ void RenderShadowMaskScanline(RendererPolygon* rp, s32 y) bool (*fnDepthTest)(s32 dstz, s32 z, u32 dstattr); if (polygon->Attr & (1<<14)) - fnDepthTest = DepthTest_Equal; + fnDepthTest = polygon->WBuffer ? DepthTest_Equal_W : DepthTest_Equal_Z; else if (polygon->FacingView) fnDepthTest = DepthTest_LessThan_FrontFacing; else @@ -1312,7 +1325,7 @@ void RenderPolygonScanline(RendererPolygon* rp, s32 y) bool (*fnDepthTest)(s32 dstz, s32 z, u32 dstattr); if (polygon->Attr & (1<<14)) - fnDepthTest = DepthTest_Equal; + fnDepthTest = polygon->WBuffer ? DepthTest_Equal_W : DepthTest_Equal_Z; else if (polygon->FacingView) fnDepthTest = DepthTest_LessThan_FrontFacing; else |