/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "common.h"

#include <cstring>

size_t getNumberOfComponents(char *dataType)
{
    if (!strcmp(dataType, "SCALAR"))
    {
        return 1;
    }
    if (!strcmp(dataType, "VEC2"))
    {
        return 2;
    }
    if (!strcmp(dataType, "VEC3"))
    {
        return 3;
    }
    if (!strcmp(dataType, "VEC4"))
    {
        return 4;
    }
    if (!strcmp(dataType, "MAT2"))
    {
        return 4;
    }
    if (!strcmp(dataType, "MAT3"))
    {
        return 9;
    }
    if (!strcmp(dataType, "MAT4"))
    {
        return 16;
    }

    return 0;
}

size_t getComponentByteLength(size_t componentType)
{
    switch (componentType)
    {
    case ComponentType::Byte:
    case ComponentType::UnsignedByte:
        return 1;

    case ComponentType::Short:
    case ComponentType::UnsignedShort:
        return 2;

    case ComponentType::UnsignedInt:
    case ComponentType::Float:
        return 4;

    default:
        return 0;
    }
}

size_t getAttributeStride(size_t componentType, char *dataType)
{
    return getComponentByteLength(componentType) * getNumberOfComponents(dataType);
}