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Examples: refactor all examples with a MainLoopStep() function, to facilitate use with Emscripten. (#2492, #3699)

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Aligned all examples.
This commit is contained in:
ocornut
2023-02-02 16:27:33 +01:00
parent b51919dce1
commit 96ab68eee0
18 changed files with 1348 additions and 1178 deletions
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35
examples/example_emscripten_wgpu/main.cpp
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@ -21,17 +21,13 @@ static WGPUSwapChain wgpu_swap_chain = NULL;
static int wgpu_swap_chain_width = 0;
static int wgpu_swap_chain_height = 0;
// States tracked across render frames
static bool show_demo_window = true;
static bool show_another_window = false;
static ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
// Forward declarations
static bool init_wgpu();
static void main_loop(void* window);
static void MainLoopStep(void* window);
static bool InitWGPU();
static void print_glfw_error(int error, const char* description);
static void print_wgpu_error(WGPUErrorType error_type, const char* message, void*);
// Main code
int main(int, char**)
{
glfwSetErrorCallback(print_glfw_error);
@ -39,9 +35,8 @@ int main(int, char**)
return 1;
// Make sure GLFW does not initialize any graphics context.
// This needs to be done explicitly later
// This needs to be done explicitly later.
glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+WebGPU example", NULL, NULL);
if (!window)
{
@ -50,7 +45,7 @@ int main(int, char**)
}
// Initialize the WebGPU environment
if (!init_wgpu())
if (!InitWGPU())
{
if (window)
glfwDestroyWindow(window);
@ -101,12 +96,12 @@ int main(int, char**)
// This function will directly return and exit the main function.
// Make sure that no required objects get cleaned up.
// This way we can use the browsers 'requestAnimationFrame' to control the rendering.
emscripten_set_main_loop_arg(main_loop, window, 0, false);
emscripten_set_main_loop_arg(MainLoopStep, window, 0, false);
return 0;
}
static bool init_wgpu()
static bool InitWGPU()
{
wgpu_device = emscripten_webgpu_get_device();
if (!wgpu_device)
@ -130,24 +125,21 @@ static bool init_wgpu()
return true;
}
static void main_loop(void* window)
static void MainLoopStep(void* window)
{
glfwPollEvents();
int width, height;
glfwGetFramebufferSize((GLFWwindow*) window, &width, &height);
glfwGetFramebufferSize((GLFWwindow*)window, &width, &height);
// React to changes in screen size
if (width != wgpu_swap_chain_width && height != wgpu_swap_chain_height)
{
ImGui_ImplWGPU_InvalidateDeviceObjects();
if (wgpu_swap_chain)
wgpuSwapChainRelease(wgpu_swap_chain);
wgpu_swap_chain_width = width;
wgpu_swap_chain_height = height;
WGPUSwapChainDescriptor swap_chain_desc = {};
swap_chain_desc.usage = WGPUTextureUsage_RenderAttachment;
swap_chain_desc.format = WGPUTextureFormat_RGBA8Unorm;
@ -155,7 +147,6 @@ static void main_loop(void* window)
swap_chain_desc.height = height;
swap_chain_desc.presentMode = WGPUPresentMode_Fifo;
wgpu_swap_chain = wgpuDeviceCreateSwapChain(wgpu_device, wgpu_surface, &swap_chain_desc);
ImGui_ImplWGPU_CreateDeviceObjects();
}
@ -164,6 +155,12 @@ static void main_loop(void* window)
ImGui_ImplGlfw_NewFrame();
ImGui::NewFrame();
// Our state
// (we use static, which essentially makes the variable globals, as a convenience to keep the example code easy to follow)
static bool show_demo_window = true;
static bool show_another_window = false;
static ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
// 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
if (show_demo_window)
ImGui::ShowDemoWindow(&show_demo_window);
@ -229,7 +226,7 @@ static void main_loop(void* window)
static void print_glfw_error(int error, const char* description)
{
printf("Glfw Error %d: %s\n", error, description);
printf("GLFW Error %d: %s\n", error, description);
}
static void print_wgpu_error(WGPUErrorType error_type, const char* message, void*)