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Pica/Math: Improved the design of the Vec2/Vec3/Vec4 classes and simplified rasterizer code accordingly.

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- Swizzlers now return const objects so that things like "first_vec4.xyz() = some_vec3" now will fail to compile (ideally we should support some vector holding references to make this actually work).
- The methods "InsertBeforeX/Y/Z" and "Append" have been replaced by more versions of MakeVec, which now also supports building new vectors from vectors.
- Vector library now follows C++ type promotion rules (hence, the result of Vec2<u8> with another Vec2<u8> is now a Vec2<int>).
This commit is contained in:
Tony Wasserka 2014-08-12 20:04:28 +02:00
parent 62c36a4ef0
commit 162d641a30
3 changed files with 133 additions and 98 deletions
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32
src/video_core/rasterizer.cpp
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@ -78,10 +78,10 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
u16 max_x = std::max({vtxpos[0].x, vtxpos[1].x, vtxpos[2].x});
u16 max_y = std::max({vtxpos[0].y, vtxpos[1].y, vtxpos[2].y});
min_x = min_x & Fix12P4::IntMask();
min_y = min_y & Fix12P4::IntMask();
max_x = (max_x + Fix12P4::FracMask()) & Fix12P4::IntMask();
max_y = (max_y + Fix12P4::FracMask()) & Fix12P4::IntMask();
min_x &= Fix12P4::IntMask();
min_y &= Fix12P4::IntMask();
max_x = ((max_x + Fix12P4::FracMask()) & Fix12P4::IntMask());
max_y = ((max_y + Fix12P4::FracMask()) & Fix12P4::IntMask());
// Triangle filling rules: Pixels on the right-sided edge or on flat bottom edges are not
// drawn. Pixels on any other triangle border are drawn. This is implemented with three bias
@ -112,10 +112,10 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
auto orient2d = [](const Math::Vec2<Fix12P4>& vtx1,
const Math::Vec2<Fix12P4>& vtx2,
const Math::Vec2<Fix12P4>& vtx3) {
const auto vec1 = (vtx2.Cast<int>() - vtx1.Cast<int>()).Append(0);
const auto vec2 = (vtx3.Cast<int>() - vtx1.Cast<int>()).Append(0);
const auto vec1 = Math::MakeVec(vtx2 - vtx1, 0);
const auto vec2 = Math::MakeVec(vtx3 - vtx1, 0);
// TODO: There is a very small chance this will overflow for sizeof(int) == 4
return Cross(vec1, vec2).z;
return Math::Cross(vec1, vec2).z;
};
int w0 = bias0 + orient2d(vtxpos[1].xy(), vtxpos[2].xy(), {x, y});
@ -143,15 +143,15 @@ 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::MakeVec3(attr0 / v0.pos.w,
attr1 / v1.pos.w,
attr2 / v2.pos.w);
auto w_inverse = Math::MakeVec3(float24::FromFloat32(1.f) / v0.pos.w,
float24::FromFloat32(1.f) / v1.pos.w,
float24::FromFloat32(1.f) / v2.pos.w);
auto baricentric_coordinates = Math::MakeVec3(float24::FromFloat32(w0),
float24::FromFloat32(w1),
float24::FromFloat32(w2));
auto attr_over_w = Math::MakeVec(attr0 / v0.pos.w,
attr1 / v1.pos.w,
attr2 / v2.pos.w);
auto w_inverse = Math::MakeVec(float24::FromFloat32(1.f) / v0.pos.w,
float24::FromFloat32(1.f) / v1.pos.w,
float24::FromFloat32(1.f) / v2.pos.w);
auto baricentric_coordinates = Math::MakeVec(float24::FromFloat32(w0),
float24::FromFloat32(w1),
float24::FromFloat32(w2));
float24 interpolated_attr_over_w = Math::Dot(attr_over_w, baricentric_coordinates);
float24 interpolated_w_inverse = Math::Dot(w_inverse, baricentric_coordinates);