// license:BSD-3-Clause // copyright-holders:Ryan Holtz //============================================================ // // uniformreader.cpp - BGFX shader uniform JSON reader // //============================================================ #include "uniformreader.h" #include "uniform.h" #include 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 } }; std::unique_ptr uniform_reader::read_from_value(const Value& value, const 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); auto* data = reinterpret_cast(std::malloc(std::max(type_size, array_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 = std::make_unique(name, type); uniform->set(data, type_size); std::free(data); return uniform; } bool uniform_reader::validate_parameters(const Value& value, const std::string &prefix) { if (!READER_CHECK(value.HasMember("name"), "%sMust have string value 'name' (what is this uniform called in the shader code?)\n", prefix)) return false; if (!READER_CHECK(value["name"].IsString(), "%sValue 'name' must be a string\n", prefix)) return false; if (!READER_CHECK(value.HasMember("type"), "%sMust have string value 'type' [int, vec4, mat3, mat4]\n", prefix)) return false; if (!READER_CHECK(value.HasMember("values"), "%sMust have array value 'values' (what are the uniform's default values?)\n", prefix)) return false; if (!READER_CHECK(value["values"].IsArray(), "%sValue 'values' must be an array\n", prefix)) return false; return true; }