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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkVertState.h"
bool VertState::Triangles(VertState* state) {
int index = state->fCurrIndex;
if (index + 3 > state->fCount) {
return false;
}
state->f0 = index + 0;
state->f1 = index + 1;
state->f2 = index + 2;
state->fCurrIndex = index + 3;
return true;
}
bool VertState::TrianglesX(VertState* state) {
const uint16_t* indices = state->fIndices;
int index = state->fCurrIndex;
if (index + 3 > state->fCount) {
return false;
}
state->f0 = indices[index + 0];
state->f1 = indices[index + 1];
state->f2 = indices[index + 2];
state->fCurrIndex = index + 3;
return true;
}
bool VertState::TriangleStrip(VertState* state) {
int index = state->fCurrIndex;
if (index + 3 > state->fCount) {
return false;
}
state->f2 = index + 2;
if (index & 1) {
state->f0 = index + 1;
state->f1 = index + 0;
} else {
state->f0 = index + 0;
state->f1 = index + 1;
}
state->fCurrIndex = index + 1;
return true;
}
bool VertState::TriangleStripX(VertState* state) {
const uint16_t* indices = state->fIndices;
int index = state->fCurrIndex;
if (index + 3 > state->fCount) {
return false;
}
state->f2 = indices[index + 2];
if (index & 1) {
state->f0 = indices[index + 1];
state->f1 = indices[index + 0];
} else {
state->f0 = indices[index + 0];
state->f1 = indices[index + 1];
}
state->fCurrIndex = index + 1;
return true;
}
bool VertState::TriangleFan(VertState* state) {
int index = state->fCurrIndex;
if (index + 3 > state->fCount) {
return false;
}
state->f0 = 0;
state->f1 = index + 1;
state->f2 = index + 2;
state->fCurrIndex = index + 1;
return true;
}
bool VertState::TriangleFanX(VertState* state) {
const uint16_t* indices = state->fIndices;
int index = state->fCurrIndex;
if (index + 3 > state->fCount) {
return false;
}
state->f0 = indices[0];
state->f1 = indices[index + 1];
state->f2 = indices[index + 2];
state->fCurrIndex = index + 1;
return true;
}
VertState::Proc VertState::chooseProc(SkVertices::VertexMode mode) {
switch (mode) {
case SkVertices::kTriangles_VertexMode:
return fIndices ? TrianglesX : Triangles;
case SkVertices::kTriangleStrip_VertexMode:
return fIndices ? TriangleStripX : TriangleStrip;
case SkVertices::kTriangleFan_VertexMode:
return fIndices ? TriangleFanX : TriangleFan;
default:
return nullptr;
}
}
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