From 8369ee58035ca98f776428f6cccbcf987fee3bc9 Mon Sep 17 00:00:00 2001 From: Yuri Kunde Schlesner Date: Tue, 23 Dec 2014 13:05:51 -0200 Subject: Rasterizer: Pre-divide vertex attributes by W Execute the division-by-W for perspective-correct interpolation of values in the clipper, moving them out of the rasterization inner loop. --- src/video_core/rasterizer.cpp | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) (limited to 'src/video_core/rasterizer.cpp') diff --git a/src/video_core/rasterizer.cpp b/src/video_core/rasterizer.cpp index 63da7104..a8014887 100644 --- a/src/video_core/rasterizer.cpp +++ b/src/video_core/rasterizer.cpp @@ -106,10 +106,7 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0, int bias1 = IsRightSideOrFlatBottomEdge(vtxpos[1].xy(), vtxpos[2].xy(), vtxpos[0].xy()) ? -1 : 0; int bias2 = IsRightSideOrFlatBottomEdge(vtxpos[2].xy(), vtxpos[0].xy(), vtxpos[1].xy()) ? -1 : 0; - const Math::Vec3 w_inverse = Math::MakeVec( - float24::FromFloat32(1.0f) / v0.pos.w, - float24::FromFloat32(1.0f) / v1.pos.w, - float24::FromFloat32(1.0f) / v2.pos.w); + auto w_inverse = Math::MakeVec(v0.pos.w, v1.pos.w, v2.pos.w); auto textures = registers.GetTextures(); auto tev_stages = registers.GetTevStages(); @@ -158,7 +155,7 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0, // // The generalization to three vertices is straightforward in baricentric coordinates. auto GetInterpolatedAttribute = [&](float24 attr0, float24 attr1, float24 attr2) { - auto attr_over_w = Math::MakeVec(attr0, attr1, attr2) * w_inverse; + auto attr_over_w = Math::MakeVec(attr0, attr1, attr2); float24 interpolated_attr_over_w = Math::Dot(attr_over_w, baricentric_coordinates); return interpolated_attr_over_w * interpolated_w_inverse; }; -- cgit v1.2.3