// license:BSD-3-Clause // copyright-holders:Ryan Holtz //============================================================ // // clearreader.cpp - BGFX clear state JSON reader // //============================================================ #include #include "clearreader.h" #include "clear.h" clear_state* clear_reader::read_from_value(const Value& value, std::string prefix) { if (!validate_parameters(value, prefix)) { return nullptr; } uint64_t clear_flags = 0; uint32_t clear_color = 0; float clear_depth = 1.0f; uint8_t clear_stencil = 0; if (value.HasMember("clearcolor")) { const Value& colors = value["clearcolor"]; for (int i = 0; i < colors.Size(); i++) { if (!READER_CHECK(colors[i].IsNumber(), (prefix + "clearcolor[" + std::to_string(i) + "] must be a numeric value\n").c_str())) return nullptr; auto val = int32_t(float(colors[i].GetDouble()) * 255.0f); if (val > 255) val = 255; if (val < 0) val = 0; clear_color |= val << (24 - (i * 3)); } clear_flags |= BGFX_CLEAR_COLOR; } if (value.HasMember("cleardepth")) { get_float(value, "cleardepth", &clear_depth, &clear_depth); clear_flags |= BGFX_CLEAR_DEPTH; } if (value.HasMember("clearstencil")) { clear_stencil = uint8_t(get_int(value, "clearstencil", clear_stencil)); clear_flags |= BGFX_CLEAR_STENCIL; } return new clear_state(clear_flags, clear_color, clear_depth, clear_stencil); } bool clear_reader::validate_parameters(const Value& value, std::string prefix) { if (!READER_CHECK(!value.HasMember("clearcolor") || (value["clearcolor"].IsArray() && value["clearcolor"].GetArray().Size() == 4), (prefix + "'clearcolor' must be an array of four numeric RGBA values representing the color to which to clear the color buffer\n").c_str())) return false; if (!READER_CHECK(!value.HasMember("cleardepth") || value["cleardepth"].IsNumber(), (prefix + "'cleardepth' must be a numeric value representing the depth to which to clear the depth buffer\n").c_str())) return false; if (!READER_CHECK(!value.HasMember("clearstencil") || value["clearstencil"].IsNumber(), (prefix + "'clearstencil' must be a numeric value representing the stencil value to which to clear the stencil buffer\n").c_str())) return false; return true; }