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Optimize trivial per-edge aa rect tessellation

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Bug: skia:
Change-Id: I380b443216b238e13bfff7ed13526dda1380ef99
Reviewed-on: https://skia-review.googlesource.com/c/171723
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
This commit is contained in:
Michael Ludwig 2018-11-21 13:56:53 -05:00 committed by Skia Commit-Bot
parent 9a061a5c2b
commit b336c39e07
5 changed files with 236 additions and 135 deletions
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34
src/gpu/GrQuad.cpp
View File

@ -19,6 +19,7 @@
// Allow some tolerance from floating point matrix transformations, but SkScalarNearlyEqual doesn't
// support comparing infinity, and coords_form_rect should return true for infinite edges
#define NEARLY_EQUAL(f1, f2) (f1 == f2 || SkScalarNearlyEqual(f1, f2, 1e-5f))
#define NEARLY_ZERO(f1) NEARLY_EQUAL(f1, 0.f)
// This is not the most performance critical function; code using GrQuad should rely on the faster
// quad type from matrix path, so this will only be called as part of SkASSERT.
@ -29,10 +30,31 @@ static bool coords_form_rect(const float xs[4], const float ys[4]) {
NEARLY_EQUAL(ys[0], ys[1]) && NEARLY_EQUAL(ys[2], ys[3]));
}
static bool coords_rectilinear(const float xs[4], const float ys[4]) {
// Edge from 0 to 1 should have the same length as edge from 3 to 2
// and edge from 1 to 3 should have the same length as edge from 2 to 0
// noo that makes it a parallelogram, need dot product between edge 0 to 1 and edge 1 to 3 = 0
// and 0-2 and 2-3 is 0.
static constexpr auto dot = SkPoint::DotProduct;
SkVector e0{xs[1] - xs[0], ys[1] - ys[0]}; // Connects to e1 and e2(repeat)
SkVector e1{xs[3] - xs[1], ys[3] - ys[1]}; // connects to e0(repeat) and e3
SkVector e2{xs[0] - xs[2], ys[0] - ys[2]}; // connects to e0 and e3(repeat)
SkVector e3{xs[2] - xs[3], ys[2] - ys[3]}; // connects to e1(repeat) and e2
return NEARLY_ZERO(dot(e0, e1)) && NEARLY_ZERO(dot(e1, e3)) &&
NEARLY_ZERO(dot(e2, e0)) && NEARLY_ZERO(dot(e3, e2));
}
GrQuadType GrQuad::quadType() const {
// Since GrQuad applies any perspective information at construction time, there's only two
// types to choose from.
return coords_form_rect(fX, fY) ? GrQuadType::kRect : GrQuadType::kStandard;
if (coords_form_rect(fX, fY)) {
return GrQuadType::kRect;
} else if (coords_rectilinear(fX, fY)) {
return GrQuadType::kRectilinear;
} else {
return GrQuadType::kStandard;
}
}
GrQuadType GrPerspQuad::quadType() const {
@ -40,7 +62,13 @@ GrQuadType GrPerspQuad::quadType() const {
return GrQuadType::kPerspective;
} else {
// Rect or standard quad, can ignore w since they are all ones
return coords_form_rect(fX, fY) ? GrQuadType::kRect : GrQuadType::kStandard;
if (coords_form_rect(fX, fY)) {
return GrQuadType::kRect;
} else if (coords_rectilinear(fX, fY)) {
return GrQuadType::kRectilinear;
} else {
return GrQuadType::kStandard;
}
}
}
#endif
@ -97,6 +125,8 @@ template void GrResolveAATypeForQuad(GrAAType, GrQuadAAFlags, const GrPerspQuad&
GrQuadType GrQuadTypeForTransformedRect(const SkMatrix& matrix) {
if (matrix.rectStaysRect()) {
return GrQuadType::kRect;
} else if (matrix.preservesRightAngles()) {
return GrQuadType::kRectilinear;
} else if (matrix.hasPerspective()) {
return GrQuadType::kPerspective;
} else {

6
src/gpu/GrQuad.h
View File

@ -20,11 +20,13 @@ enum class GrQuadAAFlags;
// 1. Stays a rectangle - the matrix rectStaysRect() is true, or x(0) == x(1) && x(2) == x(3)
// and y(0) == y(2) && y(1) == y(3). Or under mirrors, x(0) == x(2) && x(1) == x(3) and
// y(0) == y(1) && y(2) == y(3).
// 2. Is a quadrilateral - the matrix does not have perspective, but may rotate or skew, or
// 2. Is rectilinear - the matrix does not have skew or perspective, but may rotate (unlike #1)
// 3. Is a quadrilateral - the matrix does not have perspective, but may rotate or skew, or
// ws() == all ones.
// 3. Is a perspective quad - the matrix has perspective, subsuming all previous quad types.
// 4. Is a perspective quad - the matrix has perspective, subsuming all previous quad types.
enum class GrQuadType {
kRect,
kRectilinear,
kStandard,
kPerspective,
kLast = kPerspective

8
src/gpu/GrVertexWriter.h
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@ -79,6 +79,14 @@ struct GrVertexWriter {
this->write(remainder...);
}
template <typename... Args>
void write(const Sk4f& vector, const Args&... remainder) {
float buffer[4];
vector.store(buffer);
this->write<float, 4>(buffer);
this->write(remainder...);
}
void write() {}
/**

295
src/gpu/ops/GrQuadPerEdgeAA.cpp
View File

@ -15,25 +15,91 @@
#include "glsl/GrGLSLVertexGeoBuilder.h"
#include "SkNx.h"
#define AI SK_ALWAYS_INLINE
namespace {
static AI Sk4f fma(const Sk4f& f, const Sk4f& m, const Sk4f& a) {
return SkNx_fma<4, float>(f, m, a);
}
// These rotate the points/edge values either clockwise or counterclockwise assuming tri strip
// order.
static AI Sk4f nextCW(const Sk4f& v) {
return SkNx_shuffle<2, 0, 3, 1>(v);
}
static AI Sk4f nextCCW(const Sk4f& v) {
return SkNx_shuffle<1, 3, 0, 2>(v);
}
// Fills Sk4f with 1f if edge bit is set, 0f otherwise. Edges are ordered LBTR to match CCW ordering
// of vertices in the quad.
static AI Sk4f compute_edge_mask(GrQuadAAFlags aaFlags) {
return Sk4f((GrQuadAAFlags::kLeft & aaFlags) ? 1.f : 0.f,
(GrQuadAAFlags::kBottom & aaFlags) ? 1.f : 0.f,
(GrQuadAAFlags::kTop & aaFlags) ? 1.f : 0.f,
(GrQuadAAFlags::kRight & aaFlags) ? 1.f : 0.f);
}
static AI void outset_masked_vertices(const Sk4f& xdiff, const Sk4f& ydiff, const Sk4f& invLengths,
const Sk4f& mask, Sk4f* x, Sk4f* y, Sk4f* u, Sk4f* v, Sk4f* r,
int uvrCount) {
auto halfMask = 0.5f * mask;
auto maskCW = nextCW(halfMask);
*x += maskCW * -xdiff + halfMask * nextCW(xdiff);
*y += maskCW * -ydiff + halfMask * nextCW(ydiff);
if (uvrCount > 0) {
// We want to extend the texture coords by the same proportion as the positions.
maskCW *= invLengths;
halfMask *= nextCW(invLengths);
Sk4f udiff = nextCCW(*u) - *u;
Sk4f vdiff = nextCCW(*v) - *v;
*u += maskCW * -udiff + halfMask * nextCW(udiff);
*v += maskCW * -vdiff + halfMask * nextCW(vdiff);
if (uvrCount == 3) {
Sk4f rdiff = nextCCW(*r) - *r;
*r += maskCW * -rdiff + halfMask * nextCW(rdiff);
}
}
}
static AI void outset_vertices(const Sk4f& xdiff, const Sk4f& ydiff, const Sk4f& invLengths,
Sk4f* x, Sk4f* y, Sk4f* u, Sk4f* v, Sk4f* r, int uvrCount) {
*x += 0.5f * (-xdiff + nextCW(xdiff));
*y += 0.5f * (-ydiff + nextCW(ydiff));
if (uvrCount > 0) {
Sk4f t = 0.5f * invLengths;
Sk4f udiff = nextCCW(*u) - *u;
Sk4f vdiff = nextCCW(*v) - *v;
*u += t * -udiff + nextCW(t) * nextCW(udiff);
*v += t * -vdiff + nextCW(t) * nextCW(vdiff);
if (uvrCount == 3) {
Sk4f rdiff = nextCCW(*r) - *r;
*r += t * -rdiff + nextCW(t) * nextCW(rdiff);
}
}
}
static AI void compute_edge_distances(const Sk4f& a, const Sk4f& b, const Sk4f& c, const Sk4f& x,
const Sk4f& y, const Sk4f& w, Sk4f edgeDistances[]) {
for (int i = 0; i < 4; ++i) {
edgeDistances[i] = a * x[i] + b * y[i] + c * w[i];
}
}
// This computes the four edge equations for a quad, then outsets them and optionally computes a new
// quad as the intersection points of the outset edges. 'x' and 'y' contain the original points as
// input and the outset points as output. 'a', 'b', and 'c' are the edge equation coefficients on
// output. The values in x, y, u, v, and r are possibly updated if outsetting is needed.
// r is the local position's w component if it exists.
static void compute_quad_edges_and_outset_vertices(GrQuadAAFlags aaFlags, Sk4f* x, Sk4f* y, Sk4f* a,
Sk4f* b, Sk4f* c, Sk4f* u, Sk4f* v, Sk4f* r,
int uvrChannelCount, bool outsetCorners) {
// input and the outset points as output. In order to be used as a component of perspective edge
// distance calculation, this exports edge equations in 'a', 'b', and 'c'. Use
// compute_edge_distances to turn these equations into the distances needed by the shader. The
// values in x, y, u, v, and r are possibly updated if outsetting is needed. r is the local
// position's w component if it exists.
static void compute_quad_edges_and_outset_vertices(GrQuadAAFlags aaFlags, Sk4f* x, Sk4f* y,
Sk4f* a, Sk4f* b, Sk4f* c, Sk4f* u, Sk4f* v, Sk4f* r, int uvrChannelCount, bool outset) {
SkASSERT(uvrChannelCount == 0 || uvrChannelCount == 2 || uvrChannelCount == 3);
static constexpr auto fma = SkNx_fma<4, float>;
// These rotate the points/edge values either clockwise or counterclockwise assuming tri strip
// order.
auto nextCW = [](const Sk4f& v) { return SkNx_shuffle<2, 0, 3, 1>(v); };
auto nextCCW = [](const Sk4f& v) { return SkNx_shuffle<1, 3, 0, 2>(v); };
// Compute edge equations for the quad.
// Compute edge vectors for the quad.
auto xnext = nextCCW(*x);
auto ynext = nextCCW(*y);
// xdiff and ydiff will comprise the normalized vectors pointing along each quad edge.
@ -43,7 +109,7 @@ static void compute_quad_edges_and_outset_vertices(GrQuadAAFlags aaFlags, Sk4f*
xdiff *= invLengths;
ydiff *= invLengths;
// Use above vectors to compute edge equations.
// Use above vectors to compute edge equations (importantly before we outset positions).
*c = fma(xnext, *y, -ynext * *x) * invLengths;
// Make sure the edge equations have their normals facing into the quad in device space.
auto test = fma(ydiff, nextCW(*x), fma(-xdiff, nextCW(*y), *c));
@ -62,66 +128,91 @@ static void compute_quad_edges_and_outset_vertices(GrQuadAAFlags aaFlags, Sk4f*
if (aaFlags != GrQuadAAFlags::kAll) {
// This order is the same order the edges appear in xdiff/ydiff and therefore as the
// edges in a/b/c.
auto mask = Sk4f(GrQuadAAFlags::kLeft & aaFlags ? 1.f : 0.f,
GrQuadAAFlags::kBottom & aaFlags ? 1.f : 0.f,
GrQuadAAFlags::kTop & aaFlags ? 1.f : 0.f,
GrQuadAAFlags::kRight & aaFlags ? 1.f : 0.f);
Sk4f mask = compute_edge_mask(aaFlags);
// Outset edge equations for masked out edges another pixel so that they always evaluate
// >= 1.
*c += (1.f - mask);
if (outsetCorners) {
// Do the vertex outset.
mask *= 0.5f;
auto maskCW = nextCW(mask);
*x += maskCW * -xdiff + mask * nextCW(xdiff);
*y += maskCW * -ydiff + mask * nextCW(ydiff);
if (uvrChannelCount > 0) {
// We want to extend the texture coords by the same proportion as the positions.
maskCW *= invLengths;
mask *= nextCW(invLengths);
Sk4f udiff = nextCCW(*u) - *u;
Sk4f vdiff = nextCCW(*v) - *v;
*u += maskCW * -udiff + mask * nextCW(udiff);
*v += maskCW * -vdiff + mask * nextCW(vdiff);
if (uvrChannelCount == 3) {
Sk4f rdiff = nextCCW(*r) - *r;
*r += maskCW * -rdiff + mask * nextCW(rdiff);
}
}
}
} else if (outsetCorners) {
*x += 0.5f * (-xdiff + nextCW(xdiff));
*y += 0.5f * (-ydiff + nextCW(ydiff));
if (uvrChannelCount > 0) {
Sk4f t = 0.5f * invLengths;
Sk4f udiff = nextCCW(*u) - *u;
Sk4f vdiff = nextCCW(*v) - *v;
*u += t * -udiff + nextCW(t) * nextCW(udiff);
*v += t * -vdiff + nextCW(t) * nextCW(vdiff);
if (uvrChannelCount == 3) {
Sk4f rdiff = nextCCW(*r) - *r;
*r += t * -rdiff + nextCW(t) * nextCW(rdiff);
}
if (outset) {
outset_masked_vertices(xdiff, ydiff, invLengths, mask, x, y, u, v, r, uvrChannelCount);
}
} else if (outset) {
outset_vertices(xdiff, ydiff, invLengths, x, y, u, v, r, uvrChannelCount);
}
}
// Generalizes the above function to extrapolate local coords such that after perspective division
// of the device coordinate, the original local coordinate value is at the original un-outset
// device position. r is the local coordinate's w component.
static void compute_quad_edges_and_outset_persp_vertices(GrQuadAAFlags aaFlags, Sk4f* x, Sk4f* y,
Sk4f* w, Sk4f* a, Sk4f* b, Sk4f* c,
Sk4f* u, Sk4f* v, Sk4f* r,
int uvrChannelCount) {
// A specialization of the above function that can compute edge distances very quickly when it knows
// that the edges intersect at right angles, i.e. any transform other than skew and perspective
// (GrQuadType::kRectilinear). Unlike the above function, this always outsets the corners since it
// cannot be reused in the perspective case.
static void compute_rectilinear_dists_and_outset_vertices(GrQuadAAFlags aaFlags, Sk4f* x,
Sk4f* y, Sk4f edgeDistances[4], Sk4f* u, Sk4f* v, Sk4f* r, int uvrChannelCount) {
SkASSERT(uvrChannelCount == 0 || uvrChannelCount == 2 || uvrChannelCount == 3);
auto xnext = nextCCW(*x);
auto ynext = nextCCW(*y);
// xdiff and ydiff will comprise the normalized vectors pointing along each quad edge.
auto xdiff = xnext - *x;
auto ydiff = ynext - *y;
// Need length and 1/length in this variant
auto lengths = fma(xdiff, xdiff, ydiff * ydiff).sqrt();
auto invLengths = lengths.invert();
xdiff *= invLengths;
ydiff *= invLengths;
// Since the quad is rectilinear, the edge distances are predictable and independent of the
// actual orientation of the quad. The lengths vector stores |p1-p0|, |p3-p1|, |p0-p2|, |p2-p3|,
// matching the CCW order. For instance, edge distances for p0 are 0 for e0 and e2 since they
// intersect at p0. Distance to e1 is the same as p0 to p1. Distance to e3 is p0 to p2 since
// e3 goes through p2 and since the quad is rectilinear, we know that's the shortest distance.
edgeDistances[0] = Sk4f(0.f, lengths[0], 0.f, lengths[2]);
edgeDistances[1] = Sk4f(0.f, 0.f, lengths[0], lengths[1]);
edgeDistances[2] = Sk4f(lengths[2], lengths[3], 0.f, 0.f);
edgeDistances[3] = Sk4f(lengths[1], 0.f, lengths[3], 0.f);
if (aaFlags != GrQuadAAFlags::kAll) {
// This order is the same order the edges appear in xdiff/ydiff and therefore as the
// edges in a/b/c.
Sk4f mask = compute_edge_mask(aaFlags);
// Update opposite corner distances by the 0.5 pixel outset
edgeDistances[0] += Sk4f(0.f, 0.5f, 0.f, 0.5f) * mask;
edgeDistances[1] += Sk4f(0.f, 0.f, 0.5f, 0.5f) * mask;
edgeDistances[2] += Sk4f(0.5f, 0.5f, 0.f, 0.f) * mask;
edgeDistances[3] += Sk4f(0.5f, 0.f, 0.5f, 0.f) * mask;
// Outset edge equations for masked out edges another pixel so that they always evaluate
// So add 1-mask to each point's edge distances vector so that coverage >= 1 on non-aa
for (int i = 0; i < 4; ++i) {
edgeDistances[i] += (1.f - mask);
}
outset_masked_vertices(xdiff, ydiff, invLengths, mask, x, y, u, v, r, uvrChannelCount);
} else {
// Update opposite corner distances by 0.5 pixel, skipping the need for mask since that's 1s
edgeDistances[0] += Sk4f(0.f, 0.5f, 0.f, 0.5f);
edgeDistances[1] += Sk4f(0.f, 0.f, 0.5f, 0.5f);
edgeDistances[2] += Sk4f(0.5f, 0.5f, 0.f, 0.f);
edgeDistances[3] += Sk4f(0.5f, 0.f, 0.5f, 0.f);
outset_vertices(xdiff, ydiff, invLengths, x, y, u, v, r, uvrChannelCount);
}
}
// Generalizes compute_quad_edge_distances_and_outset_vertices to extrapolate local coords such that
// after perspective division of the device coordinate, the original local coordinate value is at
// the original un-outset device position. r is the local coordinate's w component.
static void compute_quad_dists_and_outset_persp_vertices(GrQuadAAFlags aaFlags, Sk4f* x,
Sk4f* y, Sk4f* w, Sk4f edgeDistances[4], Sk4f* u, Sk4f* v, Sk4f* r, int uvrChannelCount) {
SkASSERT(uvrChannelCount == 0 || uvrChannelCount == 2 || uvrChannelCount == 3);
auto iw = (*w).invert();
auto x2d = (*x) * iw;
auto y2d = (*y) * iw;
Sk4f a, b, c;
// Don't compute outset corners in the normalized space, which means u, v, and r don't need
// to be provided here (outset separately below).
compute_quad_edges_and_outset_vertices(aaFlags, &x2d, &y2d, a, b, c, nullptr, nullptr, nullptr,
/* uvr ct */ 0, /* outsetCorners */ false);
// to be provided here (outset separately below). Since this is computing distances for a
// projected quad, there is a very good chance it's not rectilinear so use the general 2D path.
compute_quad_edges_and_outset_vertices(aaFlags, &x2d, &y2d, &a, &b, &c, nullptr, nullptr,
nullptr, /* uvr ct */ 0, /* outsetCorners */ false);
static const float kOutset = 0.5f;
if ((GrQuadAAFlags::kLeft | GrQuadAAFlags::kRight) & aaFlags) {
@ -205,36 +296,13 @@ static void compute_quad_edges_and_outset_persp_vertices(GrQuadAAFlags aaFlags,
}
}
}
}
// Fast path for non-AA quads batched into an AA op. Since they are part of the AA op, the vertices
// need to have valid edge equations that ensure coverage is set to 1. To get perspective
// interpolation of the edge distance, the vertex shader outputs d*w and then multiplies by 1/w in
// the fragment shader. For non-AA edges, the edge equation can be simplified to 0*x/w + y/w + c >=
// 1, so the vertex shader outputs c*w. The quad is sent as two triangles, so a fragment is the
// interpolation between 3 of the 4 vertices. If iX are the weights for the 3 involved quad
// vertices, then the fragment shader's state is:
// f_cw = c * (iA*wA + iB*wB + iC*wC) and f_1/w = iA/wA + iB/wB + iC/wC
// (where A,B,C are chosen from {1,2,3, 4})
// When there's no perspective, then f_cw*f_1/w = c and setting c = 1 guarantees a proper non-AA
// edge. Unfortunately when there is perspective, f_cw*f_1/w != c unless the fragment is at a
// vertex. We must pick a c such that f_cw*f_1/w >= 1 across the whole primitive.
// Let n = min(w1,w2,w3,w4) and m = max(w1,w2,w3,w4) and rewrite
// f_1/w=(iA*wB*wC + iB*wA*wC + iC*wA*wB) / (wA*wB*wC)
// Since the iXs are weights for the interior of the primitive, then we have:
// n <= (iA*wA + iB*wB + iC*wC) <= m and
// n^2 <= (iA*wB*wC + iB*wA*wC + iC*wA*wB) <= m^2 and
// n^3 <= wA*wB*wC <= m^3 regardless of the choice of A,B, and C
// Thus if we set c = m^3/n^3, it guarantees f_cw*f_1/w >= 1 for any perspective.
static SkPoint3 compute_non_aa_persp_edge_coeffs(const Sk4f& w) {
float n = w.min();
float m = w.max();
return {0.f, 0.f, (m * m * m) / (n * n * n)};
// Use the original edge equations with the outset homogeneous coordinates to get the edge
// distance (technically multiplied by w, so that the fragment shader can do perspective
// interpolation when it multiplies by 1/w later).
compute_edge_distances(a, b, c, *x, *y, *w, edgeDistances);
}
// When there's guaranteed no perspective, the edge coefficients for non-AA quads is constant
static constexpr SkPoint3 kNonAANoPerspEdgeCoeffs = {0, 0, 1};
} // anonymous namespace
namespace GrQuadPerEdgeAA {
@ -248,13 +316,10 @@ void* Tessellate(void* vertices, const VertexSpec& spec, const GrPerspQuad& devi
bool localHasPerspective = spec.localQuadType() == GrQuadType::kPerspective;
GrVertexColor color(color4f, GrQuadPerEdgeAA::ColorType::kHalf == spec.colorType());
// Load position data into Sk4fs (always x, y and maybe w)
// Load position data into Sk4fs (always x, y, and load w to avoid branching down the road)
Sk4f x = deviceQuad.x4f();
Sk4f y = deviceQuad.y4f();
Sk4f w;
if (deviceHasPerspective) {
w = deviceQuad.w4f();
}
Sk4f w = deviceQuad.w4f(); // Guaranteed to be 1f if it's not perspective
// Load local position data into Sk4fs (either none, just u,v or all three)
Sk4f u, v, r;
@ -267,48 +332,42 @@ void* Tessellate(void* vertices, const VertexSpec& spec, const GrPerspQuad& devi
}
}
Sk4f a, b, c;
// Index into array refers to vertex. Index into particular Sk4f refers to edge.
Sk4f edgeDistances[4];
if (spec.usesCoverageAA()) {
// Must calculate edges and possibly outside the positions
if (aaFlags == GrQuadAAFlags::kNone) {
// A non-AA quad that got batched into an AA group, so its edges will be the same for
// all four vertices and it does not need to be outset
SkPoint3 edgeCoeffs;
if (deviceHasPerspective) {
edgeCoeffs = compute_non_aa_persp_edge_coeffs(w);
} else {
edgeCoeffs = kNonAANoPerspEdgeCoeffs;
// A non-AA quad that got batched into an AA group, so it should have full coverage
// everywhere, so set the edge distances to w for each vertex (so that after perspective
// division, it is equal to 1).
for (int i = 0; i < 4; ++i) {
edgeDistances[i] = w[i];
}
// Copy the coefficients into all four equations
a = edgeCoeffs.fX;
b = edgeCoeffs.fY;
c = edgeCoeffs.fZ;
} else if (deviceHasPerspective) {
// For simplicity, pointers to u, v, and r are always provided, but the local dim param
// ensures that only loaded Sk4fs are modified in the compute functions.
compute_quad_edges_and_outset_persp_vertices(aaFlags, &x, &y, &w, &a, &b, &c,
compute_quad_dists_and_outset_persp_vertices(aaFlags, &x, &y, &w, edgeDistances,
&u, &v, &r, spec.localDimensionality());
} else if (spec.deviceQuadType() <= GrQuadType::kRectilinear) {
compute_rectilinear_dists_and_outset_vertices(aaFlags, &x, &y, edgeDistances,
&u, &v, &r, spec.localDimensionality());
} else {
Sk4f a, b, c;
compute_quad_edges_and_outset_vertices(aaFlags, &x, &y, &a, &b, &c, &u, &v, &r,
spec.localDimensionality(), /*outset*/ true);
compute_edge_distances(a, b, c, x, y, w, edgeDistances); // w holds 1.f as desired
}
}
// Now rearrange the Sk4fs into the interleaved vertex layout:
// i.e. x1x2x3x4 y1y2y3y4 -> x1y1 x2y2 x3y3 x4y
// while also calculating the edge distance for each outset vertex for the four edges.
SkPoint3 p; // Stores the homogeneous vertex position, w = 1 explicitly for 2D cases
Sk4f edgeDists;
GrVertexWriter vb{vertices};
for (int i = 0; i < 4; ++i) {
// save position and hold on to the homogeneous point for later
if (deviceHasPerspective) {
p.set(x[i], y[i], w[i]);
vb.write<SkPoint3>(p);
vb.write<SkPoint3>({x[i], y[i], w[i]});
} else {
p.set(x[i], y[i], 1.f);
vb.write<SkPoint>({p.fX, p.fY});
vb.write<SkPoint>({x[i], y[i]});
}
// save color
@ -327,16 +386,12 @@ void* Tessellate(void* vertices, const VertexSpec& spec, const GrPerspQuad& devi
// save the domain
if (spec.hasDomain()) {
vb.write<SkRect>(domain);
vb.write(domain);
}
// save the edges
if (spec.usesCoverageAA()) {
// w is stored in point's fZ, and set to 1 for 2D,
// fragment shader will automatically divide by pixel's w if the quad has perspective
// to get the perceptually interpolated edge distance.
edgeDists = p.fX * a + p.fY * b + p.fZ * c;
vb.write<float>(edgeDists[0], edgeDists[1], edgeDists[2], edgeDists[3]);
vb.write(edgeDistances[i]);
}
}

26
src/gpu/ops/GrTextureOp.cpp
View File

@ -307,7 +307,7 @@ private:
GrResolveAATypeForQuad(aaType, aaFlags, quad, quadType, &aaType, &aaFlags);
fAAType = static_cast<unsigned>(aaType);
fPerspective = static_cast<unsigned>(quadType == GrQuadType::kPerspective);
fQuadType = static_cast<unsigned>(quadType);
// We expect our caller to have already caught this optimization.
SkASSERT(!srcRect.contains(proxy->getWorstCaseBoundsRect()) ||
constraint == SkCanvas::kFast_SrcRectConstraint);
@ -386,7 +386,7 @@ private:
fFilter = static_cast<unsigned>(GrSamplerState::Filter::kNearest);
}
this->setBounds(bounds, HasAABloat(this->aaType() == GrAAType::kCoverage), IsZeroArea::kNo);
fPerspective = static_cast<unsigned>(viewMatrix.hasPerspective());
fQuadType = static_cast<unsigned>(quadType);
fDomain = static_cast<unsigned>(false);
fWideColor = static_cast<unsigned>(false);
}
@ -410,7 +410,7 @@ private:
void onPrepareDraws(Target* target) override {
TRACE_EVENT0("skia", TRACE_FUNC);
bool hasPerspective = false;
GrQuadType quadType = GrQuadType::kRect;
Domain domain = Domain::kNo;
bool wideColor = false;
int numProxies = 0;
@ -419,7 +419,9 @@ private:
auto config = fProxies[0].fProxy->config();
GrAAType aaType = this->aaType();
for (const auto& op : ChainRange<TextureOp>(this)) {
hasPerspective |= op.fPerspective;
if (op.quadType() > quadType) {
quadType = op.quadType();
}
if (op.fDomain) {
domain = Domain::kYes;
}
@ -440,9 +442,8 @@ private:
}
}
VertexSpec vertexSpec(hasPerspective ? GrQuadType::kPerspective : GrQuadType::kStandard,
wideColor ? ColorType::kHalf : ColorType::kByte, GrQuadType::kRect,
/* hasLocal */ true, domain, aaType);
VertexSpec vertexSpec(quadType, wideColor ? ColorType::kHalf : ColorType::kByte,
GrQuadType::kRect, /* hasLocal */ true, domain, aaType);
sk_sp<GrGeometryProcessor> gp = TextureGeometryProcessor::Make(
textureType, config, this->filter(), std::move(fTextureColorSpaceXform),
@ -565,7 +566,9 @@ private:
}
fProxies[0].fQuadCnt += that->fQuads.count();
fQuads.push_back_n(that->fQuads.count(), that->fQuads.begin());
fPerspective |= that->fPerspective;
if (that->fQuadType > fQuadType) {
fQuadType = that->fQuadType;
}
fDomain |= that->fDomain;
fWideColor |= that->fWideColor;
if (upgradeToCoverageAAOnMerge) {
@ -576,6 +579,7 @@ private:
GrAAType aaType() const { return static_cast<GrAAType>(fAAType); }
GrSamplerState::Filter filter() const { return static_cast<GrSamplerState::Filter>(fFilter); }
GrQuadType quadType() const { return static_cast<GrQuadType>(fQuadType); }
class Quad {
public:
@ -609,15 +613,17 @@ private:
sk_sp<GrColorSpaceXform> fTextureColorSpaceXform;
unsigned fFilter : 2;
unsigned fAAType : 2;
unsigned fPerspective : 1;
unsigned fQuadType : 2; // Device quad, src quad is always trivial
unsigned fDomain : 1;
unsigned fWideColor : 1;
// Used to track whether fProxy is ref'ed or has a pending IO after finalize() is called.
unsigned fFinalized : 1;
unsigned fCanSkipAllocatorGather : 1;
unsigned fProxyCnt : 32 - 8;
unsigned fProxyCnt : 32 - 10;
Proxy fProxies[1];
static_assert(kGrQuadTypeCount <= 4, "GrQuadType does not fit in 2 bits");
typedef GrMeshDrawOp INHERITED;
};