// license:BSD-3-Clause // copyright-holders:Ryan Holtz //============================================================ // // uniformreader.cpp - BGFX shader uniform JSON reader // //============================================================ #include "uniformreader.h" #include "uniform.h" const uniform_reader::string_to_enum uniform_reader::TYPE_NAMES[uniform_reader::TYPE_COUNT] = { { "int", bgfx::UniformType::Sampler }, { "vec4", bgfx::UniformType::Vec4 }, { "mat3", bgfx::UniformType::Mat3 }, { "mat4", bgfx::UniformType::Mat4 } }; bgfx_uniform* uniform_reader::read_from_value(const Value& value, std::string prefix) { if (!validate_parameters(value, prefix)) { return nullptr; } const char* name = value["name"].GetString(); 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); 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; auto* data = reinterpret_cast(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; } auto* uniform = new bgfx_uniform(name, type); uniform->set((void*)data, type_size); delete [] data; return uniform; } bool uniform_reader::validate_parameters(const Value& value, std::string prefix) { if (!READER_CHECK(value.HasMember("name"), (prefix + "Must have string value 'name' (what is this uniform called in the shader code?)\n").c_str())) return false; if (!READER_CHECK(value["name"].IsString(), (prefix + "Value 'name' must be a string\n").c_str())) return false; if (!READER_CHECK(value.HasMember("type"), (prefix + "Must have string value 'type' [int, vec4, mat3, mat4]\n").c_str())) return false; if (!READER_CHECK(value.HasMember("values"), (prefix + "Must have array value 'values' (what are the uniform's default values?)\n").c_str())) return false; if (!READER_CHECK(value["values"].IsArray(), (prefix + "Value 'values' must be an array\n").c_str())) return false; return true; }