103 lines
3.7 KiB
C++
Executable File
103 lines
3.7 KiB
C++
Executable File
/*
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* Copyright (C) 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "Mesh.h"
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#include <GLES/gl.h>
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#include <SkMesh.h>
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#include "SafeMath.h"
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static size_t min_vcount_for_mode(SkMesh::Mode mode) {
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switch (mode) {
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case SkMesh::Mode::kTriangles:
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return 3;
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case SkMesh::Mode::kTriangleStrip:
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return 3;
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}
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}
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// Re-implementation of SkMesh::validate to validate user side that their mesh is valid.
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std::tuple<bool, SkString> Mesh::validate() {
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#define FAIL_MESH_VALIDATE(...) return std::make_tuple(false, SkStringPrintf(__VA_ARGS__))
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if (!mMeshSpec) {
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FAIL_MESH_VALIDATE("MeshSpecification is required.");
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}
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if (mVertexBufferData.empty()) {
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FAIL_MESH_VALIDATE("VertexBuffer is required.");
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}
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auto meshStride = mMeshSpec->stride();
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auto meshMode = SkMesh::Mode(mMode);
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SafeMath sm;
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size_t vsize = sm.mul(meshStride, mVertexCount);
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if (sm.add(vsize, mVertexOffset) > mVertexBufferData.size()) {
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FAIL_MESH_VALIDATE(
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"The vertex buffer offset and vertex count reads beyond the end of the"
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" vertex buffer.");
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}
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if (mVertexOffset % meshStride != 0) {
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FAIL_MESH_VALIDATE("The vertex offset (%zu) must be a multiple of the vertex stride (%zu).",
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mVertexOffset, meshStride);
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}
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if (size_t uniformSize = mMeshSpec->uniformSize()) {
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if (!mBuilder->fUniforms || mBuilder->fUniforms->size() < uniformSize) {
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FAIL_MESH_VALIDATE("The uniform data is %zu bytes but must be at least %zu.",
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mBuilder->fUniforms->size(), uniformSize);
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}
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}
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auto modeToStr = [](SkMesh::Mode m) {
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switch (m) {
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case SkMesh::Mode::kTriangles:
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return "triangles";
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case SkMesh::Mode::kTriangleStrip:
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return "triangle-strip";
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}
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};
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if (!mIndexBufferData.empty()) {
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if (mIndexCount < min_vcount_for_mode(meshMode)) {
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FAIL_MESH_VALIDATE("%s mode requires at least %zu indices but index count is %zu.",
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modeToStr(meshMode), min_vcount_for_mode(meshMode), mIndexCount);
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}
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size_t isize = sm.mul(sizeof(uint16_t), mIndexCount);
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if (sm.add(isize, mIndexOffset) > mIndexBufferData.size()) {
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FAIL_MESH_VALIDATE(
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"The index buffer offset and index count reads beyond the end of the"
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" index buffer.");
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}
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// If we allow 32 bit indices then this should enforce 4 byte alignment in that case.
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if (!SkIsAlign2(mIndexOffset)) {
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FAIL_MESH_VALIDATE("The index offset must be a multiple of 2.");
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}
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} else {
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if (mVertexCount < min_vcount_for_mode(meshMode)) {
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FAIL_MESH_VALIDATE("%s mode requires at least %zu vertices but vertex count is %zu.",
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modeToStr(meshMode), min_vcount_for_mode(meshMode), mVertexCount);
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}
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SkASSERT(!fICount);
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SkASSERT(!fIOffset);
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}
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if (!sm.ok()) {
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FAIL_MESH_VALIDATE("Overflow");
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}
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#undef FAIL_MESH_VALIDATE
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return {true, {}};
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}
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