std::string
LoadObj(
std::vector<shape_t>& shapes,
std::vector<material_t>& materials, // [output]
const char* filename,
const char* mtl_basepath)
{
shapes.clear();
std::stringstream err;
std::ifstream ifs(filename);
if (!ifs) {
err << "Cannot open file [" << filename << "]" << std::endl;
return err.str();
}
std::string basePath;
if (mtl_basepath) {
basePath = mtl_basepath;
}
MaterialFileReader matFileReader( basePath );
return LoadObj(shapes, materials, ifs, matFileReader);
}
void prepareVertices()
{
// Load mesh from compressed asset
AAsset* asset = AAssetManager_open(app->activity->assetManager, "models/vulkanlogo.obj", AASSET_MODE_STREAMING);
assert(asset);
size_t size = AAsset_getLength(asset);
assert(size > 0);
char *assetData = new char[size];
AAsset_read(asset, assetData, size);
AAsset_close(asset);
std::stringstream assetStream(assetData);
std::vector<tinyobj::shape_t> shapes;
std::vector<tinyobj::material_t> materials;
std::string objerr;
tinyobj::MaterialFileReader matFileReader("");
bool ret = tinyobj::LoadObj(shapes, materials, objerr, assetStream, matFileReader, true);
LOGW("shapes %d", shapes.size());
// Setup vertices
float scale = 0.025f;
std::vector<Vertex> vertexBuffer;
std::vector<uint32_t> indexBuffer;
for (auto& shape : shapes)
{
// Vertices
for (size_t i = 0; i < shape.mesh.positions.size() / 3; i++)
{
Vertex v;
v.pos[0] = shape.mesh.positions[3 * i + 0] * scale;
v.pos[1] = -shape.mesh.positions[3 * i + 1] * scale;
v.pos[2] = shape.mesh.positions[3 * i + 2] * scale;
v.normal[0] = shape.mesh.normals[3 * i + 0];
v.normal[1] = shape.mesh.normals[3 * i + 1];
v.normal[2] = shape.mesh.normals[3 * i + 2];
v.color = glm::vec3(1.0f, 0.0f, 0.0f);
vertexBuffer.push_back(v);
}
// Indices
for (size_t i = 0; i < shape.mesh.indices.size() / 3; i++)
{
indexBuffer.push_back(shape.mesh.indices[3 * i + 0]);
indexBuffer.push_back(shape.mesh.indices[3 * i + 1]);
indexBuffer.push_back(shape.mesh.indices[3 * i + 2]);
}
}
uint32_t vertexBufferSize = vertexBuffer.size() * sizeof(Vertex);
uint32_t indexBufferSize = indexBuffer.size() * sizeof(uint32_t);
VkMemoryAllocateInfo memAlloc = {};
memAlloc.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
memAlloc.pNext = NULL;
memAlloc.allocationSize = 0;
memAlloc.memoryTypeIndex = 0;
VkMemoryRequirements memReqs;
VkResult err;
void *data;
// Generate vertex buffer
// Setup
VkBufferCreateInfo bufInfo = {};
bufInfo.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
bufInfo.pNext = NULL;
bufInfo.size = vertexBufferSize;
bufInfo.usage = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT;
bufInfo.flags = 0;
// Copy vertex data to VRAM
memset(&vertices, 0, sizeof(vertices));
err = vkCreateBuffer(device, &bufInfo, nullptr, &vertices.buf);
assert(!err);
vkGetBufferMemoryRequirements(device, vertices.buf, &memReqs);
memAlloc.allocationSize = memReqs.size;
getMemoryType(memReqs.memoryTypeBits, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT, &memAlloc.memoryTypeIndex);
vkAllocateMemory(device, &memAlloc, nullptr, &vertices.mem);
assert(!err);
err = vkMapMemory(device, vertices.mem, 0, memAlloc.allocationSize, 0, &data);
assert(!err);
memcpy(data, vertexBuffer.data(), vertexBufferSize);
vkUnmapMemory(device, vertices.mem);
assert(!err);
err = vkBindBufferMemory(device, vertices.buf, vertices.mem, 0);
assert(!err);
// Generate index buffer
// Setup
VkBufferCreateInfo indexbufferInfo = {};
indexbufferInfo.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
indexbufferInfo.pNext = NULL;
indexbufferInfo.size = indexBufferSize;
indexbufferInfo.usage = VK_BUFFER_USAGE_INDEX_BUFFER_BIT;
indexbufferInfo.flags = 0;
// Copy index data to VRAM
memset(&indices, 0, sizeof(indices));
err = vkCreateBuffer(device, &bufInfo, nullptr, &indices.buf);
assert(!err);
vkGetBufferMemoryRequirements(device, indices.buf, &memReqs);
memAlloc.allocationSize = memReqs.size;
getMemoryType(memReqs.memoryTypeBits, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT, &memAlloc.memoryTypeIndex);
err = vkAllocateMemory(device, &memAlloc, nullptr, &indices.mem);
assert(!err);
err = vkMapMemory(device, indices.mem, 0, indexBufferSize, 0, &data);
assert(!err);
memcpy(data, indexBuffer.data(), indexBufferSize);
vkUnmapMemory(device, indices.mem);
err = vkBindBufferMemory(device, indices.buf, indices.mem, 0);
assert(!err);
indices.count = indexBuffer.size();
// Binding description
vertices.bindingDescriptions.resize(1);
vertices.bindingDescriptions[0] =
vkTools::initializers::vertexInputBindingDescription(
VERTEX_BUFFER_BIND_ID,
sizeof(Vertex),
VK_VERTEX_INPUT_RATE_VERTEX);
// Attribute descriptions
// Describes memory layout and shader positions
vertices.attributeDescriptions.resize(3);
// Location 0 : Position
vertices.attributeDescriptions[0] =
vkTools::initializers::vertexInputAttributeDescription(
VERTEX_BUFFER_BIND_ID,
0,
VK_FORMAT_R32G32B32_SFLOAT,
0);
// Location 1 : Normal
vertices.attributeDescriptions[1] =
vkTools::initializers::vertexInputAttributeDescription(
VERTEX_BUFFER_BIND_ID,
1,
VK_FORMAT_R32G32B32_SFLOAT,
sizeof(float) * 3);
// Location 2 : Color
vertices.attributeDescriptions[2] =
vkTools::initializers::vertexInputAttributeDescription(
VERTEX_BUFFER_BIND_ID,
2,
VK_FORMAT_R32G32B32_SFLOAT,
sizeof(float) * 6);
// Assign to vertex buffer
vertices.inputState.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;
vertices.inputState.pNext = NULL;
vertices.inputState.vertexBindingDescriptionCount = vertices.bindingDescriptions.size();
vertices.inputState.pVertexBindingDescriptions = vertices.bindingDescriptions.data();
vertices.inputState.vertexAttributeDescriptionCount = vertices.attributeDescriptions.size();
vertices.inputState.pVertexAttributeDescriptions = vertices.attributeDescriptions.data();
}
