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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 "src/core/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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