Function ProcessArguments

StandAlone/StandAlone.cpp:557–1161

Do all command-line argument parsing. This includes building up the work-items to be processed later, and saving all the command-line options. Does not return (it exits) if command-line is fatally flawed.

// Does not return (it exits) if command-line is fatally flawed.
//
void ProcessArguments(std::vector<std::unique_ptr<glslang::TWorkItem>>& workItems, int argc, char* argv[])
{
    for (int res = 0; res < glslang::EResCount; ++res)
        baseBinding[res].fill(0);

    ExecutableName = argv[0];
    workItems.reserve(argc);

    const auto bumpArg = [&]() {
        if (argc > 0) {
            argc--;
            argv++;
        }
    };

    // read a string directly attached to a single-letter option
    const auto getStringOperand = [&](const char* desc) {
        if (argv[0][2] == 0) {
            printf("%s must immediately follow option (no spaces)\n", desc);
            exit(EFailUsage);
        }
        return argv[0] + 2;
    };

    // read a number attached to a single-letter option
    const auto getAttachedNumber = [&](const char* desc) {
        int num = atoi(argv[0] + 2);
        if (num == 0) {
            printf("%s: expected attached non-0 number\n", desc);
            exit(EFailUsage);
        }
        return num;
    };

    // minimum needed (without overriding something else) to target Vulkan SPIR-V
    const auto setVulkanSpv = []() {
        if (Client == glslang::EShClientNone)
            ClientVersion = glslang::EShTargetVulkan_1_0;
        Client = glslang::EShClientVulkan;
        Options |= EOptionSpv;
        Options |= EOptionVulkanRules;
        Options |= EOptionLinkProgram;
    };

    // minimum needed (without overriding something else) to target OpenGL SPIR-V
    const auto setOpenGlSpv = []() {
        if (Client == glslang::EShClientNone)
            ClientVersion = glslang::EShTargetOpenGL_450;
        Client = glslang::EShClientOpenGL;
        Options |= EOptionSpv;
        Options |= EOptionLinkProgram;
        // undo a -H default to Vulkan
        Options &= ~EOptionVulkanRules;
    };

    const auto getUniformOverride = [getStringOperand]() {
        const char *arg = getStringOperand("-u<name>:<location>");
        const char *split = strchr(arg, ':');