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Create a Null backend.

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This will be useful to run validation unittests without using the GPU.
This commit is contained in:
Corentin Wallez
2017-05-24 16:04:55 +02:00
committed by Corentin Wallez
parent 68df8b0a3a
commit 79a62bf6e3
6 changed files with 317 additions and 4 deletions
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30
examples/Utils.cpp
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@@ -59,6 +59,24 @@ class OpenGLBinding : public BackendBinding {
}
};
namespace backend {
namespace null {
void Init(nxtProcTable* procs, nxtDevice* device);
}
}
class NullBinding : public BackendBinding {
public:
void SetupGLFWWindowHints() override {
}
void GetProcAndDevice(nxtProcTable* procs, nxtDevice* device) override {
backend::null::Init(procs, device);
}
void SwapBuffers() override {
}
};
void PrintDeviceError(const char* message, nxt::CallbackUserdata) {
std::cout << "Device error: " << message << std::endl;
}
@@ -66,6 +84,7 @@ void PrintDeviceError(const char* message, nxt::CallbackUserdata) {
enum class BackendType {
OpenGL,
Metal,
Null,
};
enum class CmdBufType {
@@ -97,6 +116,9 @@ void GetProcTableAndDevice(nxtProcTable* procs, nxt::Device* device) {
fprintf(stderr, "Metal backend no present on this platform\n");
#endif
break;
case BackendType::Null:
binding = new NullBinding;
break;
}
if (!glfwInit()) {
@@ -226,7 +248,11 @@ extern "C" {
backendType = BackendType::Metal;
continue;
}
fprintf(stderr, "--backend expects a backend name (opengl, metal)\n");
if (i < argc && std::string("null") == argv[i]) {
backendType = BackendType::Null;
continue;
}
fprintf(stderr, "--backend expects a backend name (opengl, metal, null)\n");
return false;
}
if (std::string("-c") == argv[i] || std::string("--comand-buffer") == argv[i]) {
@@ -244,7 +270,7 @@ extern "C" {
}
if (std::string("-h") == argv[i] || std::string("--help") == argv[i]) {
printf("Usage: %s [-b BACKEND] [-c COMMAND_BUFFER]\n", argv[0]);
printf(" BACKEND is one of: opengl, metal\n");
printf(" BACKEND is one of: opengl, metal, null\n");
printf(" COMMAND_BUFFER is one of: none, terrible\n");
return false;
}