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path: root/src/osd/modules/render/bgfx/uniformreader.cpp
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#include "uniformreader.h"
#include "uniform.h"

const uniform_reader::string_to_enum uniform_reader::TYPE_NAMES[uniform_reader::TYPE_COUNT] = {
    { "int",    bgfx::UniformType::Int1 },
    { "vec4",   bgfx::UniformType::Vec4 },
    { "mat3",   bgfx::UniformType::Mat3 },
    { "mat4",   bgfx::UniformType::Mat4 },
    { "camera", bgfx::UniformType::Mat4 }
};

bgfx_uniform* uniform_reader::read_from_value(const Value& value)
{
    assert(value.HasMember("name"));
    assert(value["name"].IsString());
    const char* name = value["name"].GetString();

    assert(value.HasMember("type"));
    bgfx::UniformType::Enum type = bgfx::UniformType::Enum(get_enum_from_value(value, "type", bgfx::UniformType::Vec4, TYPE_NAMES, TYPE_COUNT));
    const size_t type_size = bgfx_uniform::get_size_for_type(type);

    assert(value.HasMember("values"));
    assert(value["values"].IsArray());
    const Value& value_array = value["values"];
    const size_t array_size = value_array.Size() * sizeof(float);

    const size_t alloc_size = (type_size > array_size) ? type_size : array_size;
    float* data = reinterpret_cast<float*>(new char[alloc_size]);

    unsigned int index = 0;
    for (; index < type_size / 4 && index < value_array.Size(); index++)
    {
        data[index] = (float)value_array[index].GetDouble();
    }

    for (; index < type_size / 4; index++) {
        data[index] = 0.0f;
    }

    bgfx_uniform* uniform = new bgfx_uniform(name, type);
    uniform->set((void*)data, type_size);
    delete [] data;

    return uniform;
}