| // Copyright 2020 The Dawn Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| // This is an example to manually test swapchain code. Controls are the following, scoped to the |
| // currently focused window: |
| // - W: creates a new window. |
| // - L: Latches the current swapchain, to check what happens when the window changes but not the |
| // swapchain. |
| // - R: switches the rendering mode, between "The Red Triangle" and color-cycling clears that's |
| // (WARNING) likely seizure inducing. |
| // - D: cycles the divisor for the swapchain size. |
| // - P: switches present modes. |
| // |
| // Closing all the windows exits the example. ^C also works. |
| // |
| // Things to test manually: |
| // |
| // - Basic tests (with the triangle render mode): |
| // - Check the triangle is red on a black background and with the pointy side up. |
| // - Cycle render modes a bunch and check that the triangle background is always solid black. |
| // - Check that rendering triangles to multiple windows works. |
| // |
| // - Present mode single-window tests (with cycling color render mode): |
| // - Check that Fifo cycles at about 1 cycle per second and has no tearing. |
| // - Check that Mailbox cycles faster than Fifo and has no tearing. |
| // - Check that Immediate cycles faster than Fifo, it is allowed to have tearing. (dragging |
| // between two monitors can help see tearing) |
| // |
| // - Present mode multi-window tests, it should have the same results as single-window tests when |
| // all windows are in the same present mode. In mixed present modes only Immediate windows are |
| // allowed to tear. |
| // |
| // - Resizing tests (with the triangle render mode): |
| // - Check that cycling divisors on the triangle produces lower and lower resolution triangles. |
| // - Check latching the swapchain config and resizing the window a bunch (smaller, bigger, and |
| // diagonal aspect ratio). |
| // |
| // - Config change tests: |
| // - Check that cycling between present modes works. |
| // - TODO can't be tested yet: check cycling the same window over multiple devices. |
| // - TODO can't be tested yet: check cycling the same window over multiple formats. |
| |
| #include "dawn/common/Assert.h" |
| #include "dawn/common/Log.h" |
| #include "dawn/utils/ComboRenderPipelineDescriptor.h" |
| #include "dawn/utils/GLFWUtils.h" |
| #include "dawn/utils/ScopedAutoreleasePool.h" |
| #include "dawn/utils/WGPUHelpers.h" |
| |
| #include <dawn/dawn_proc.h> |
| #include <dawn/native/DawnNative.h> |
| #include <dawn/webgpu_cpp.h> |
| #include "GLFW/glfw3.h" |
| |
| #include <memory> |
| #include <unordered_map> |
| |
| struct WindowData { |
| GLFWwindow* window = nullptr; |
| uint64_t serial = 0; |
| |
| float clearCycle = 1.0f; |
| bool latched = false; |
| bool renderTriangle = true; |
| uint32_t divisor = 1; |
| |
| wgpu::Surface surface = nullptr; |
| wgpu::SwapChain swapchain = nullptr; |
| |
| wgpu::SwapChainDescriptor currentDesc; |
| wgpu::SwapChainDescriptor targetDesc; |
| }; |
| |
| static std::unordered_map<GLFWwindow*, std::unique_ptr<WindowData>> windows; |
| static uint64_t windowSerial = 0; |
| |
| static std::unique_ptr<dawn::native::Instance> instance; |
| static wgpu::Device device; |
| static wgpu::Queue queue; |
| static wgpu::RenderPipeline trianglePipeline; |
| |
| bool IsSameDescriptor(const wgpu::SwapChainDescriptor& a, const wgpu::SwapChainDescriptor& b) { |
| return a.usage == b.usage && a.format == b.format && a.width == b.width && |
| a.height == b.height && a.presentMode == b.presentMode; |
| } |
| |
| void OnKeyPress(GLFWwindow* window, int key, int, int action, int); |
| |
| void SyncFromWindow(WindowData* data) { |
| int width; |
| int height; |
| glfwGetFramebufferSize(data->window, &width, &height); |
| |
| data->targetDesc.width = std::max(1u, width / data->divisor); |
| data->targetDesc.height = std::max(1u, height / data->divisor); |
| } |
| |
| void AddWindow() { |
| glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API); |
| GLFWwindow* window = glfwCreateWindow(400, 400, "", nullptr, nullptr); |
| glfwSetKeyCallback(window, OnKeyPress); |
| |
| wgpu::SwapChainDescriptor descriptor; |
| descriptor.usage = wgpu::TextureUsage::RenderAttachment; |
| descriptor.format = wgpu::TextureFormat::BGRA8Unorm; |
| descriptor.width = 0; |
| descriptor.height = 0; |
| descriptor.presentMode = wgpu::PresentMode::Fifo; |
| |
| std::unique_ptr<WindowData> data = std::make_unique<WindowData>(); |
| data->window = window; |
| data->serial = windowSerial++; |
| data->surface = utils::CreateSurfaceForWindow(instance->Get(), window); |
| data->currentDesc = descriptor; |
| data->targetDesc = descriptor; |
| SyncFromWindow(data.get()); |
| |
| windows[window] = std::move(data); |
| } |
| |
| void DoRender(WindowData* data) { |
| wgpu::TextureView view = data->swapchain.GetCurrentTextureView(); |
| wgpu::CommandEncoder encoder = device.CreateCommandEncoder(); |
| |
| if (data->renderTriangle) { |
| utils::ComboRenderPassDescriptor desc({view}); |
| // Use Load to check the swapchain is lazy cleared (we shouldn't see garbage from previous |
| // frames). |
| desc.cColorAttachments[0].loadOp = wgpu::LoadOp::Load; |
| |
| wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&desc); |
| pass.SetPipeline(trianglePipeline); |
| pass.Draw(3); |
| pass.EndPass(); |
| } else { |
| data->clearCycle -= 1.0 / 60.f; |
| if (data->clearCycle < 0.0) { |
| data->clearCycle = 1.0f; |
| } |
| |
| utils::ComboRenderPassDescriptor desc({view}); |
| desc.cColorAttachments[0].loadOp = wgpu::LoadOp::Clear; |
| desc.cColorAttachments[0].clearColor = {data->clearCycle, 1.0f - data->clearCycle, 0.0f, |
| 1.0f}; |
| |
| wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&desc); |
| pass.EndPass(); |
| } |
| |
| wgpu::CommandBuffer commands = encoder.Finish(); |
| queue.Submit(1, &commands); |
| |
| data->swapchain.Present(); |
| } |
| |
| std::ostream& operator<<(std::ostream& o, const wgpu::SwapChainDescriptor& desc) { |
| // For now only render attachment is possible. |
| ASSERT(desc.usage == wgpu::TextureUsage::RenderAttachment); |
| o << "RenderAttachment "; |
| o << desc.width << "x" << desc.height << " "; |
| |
| // For now only BGRA is allowed |
| ASSERT(desc.format == wgpu::TextureFormat::BGRA8Unorm); |
| o << "BGRA8Unorm "; |
| |
| switch (desc.presentMode) { |
| case wgpu::PresentMode::Immediate: |
| o << "Immediate"; |
| break; |
| case wgpu::PresentMode::Fifo: |
| o << "Fifo"; |
| break; |
| case wgpu::PresentMode::Mailbox: |
| o << "Mailbox"; |
| break; |
| } |
| return o; |
| } |
| |
| void UpdateTitle(WindowData* data) { |
| std::ostringstream o; |
| |
| o << data->serial << " "; |
| if (data->divisor != 1) { |
| o << "Divisor:" << data->divisor << " "; |
| } |
| |
| if (data->latched) { |
| o << "Latched: (" << data->currentDesc << ") "; |
| o << "Target: (" << data->targetDesc << ")"; |
| } else { |
| o << "(" << data->currentDesc << ")"; |
| } |
| |
| glfwSetWindowTitle(data->window, o.str().c_str()); |
| } |
| |
| void OnKeyPress(GLFWwindow* window, int key, int, int action, int) { |
| if (action != GLFW_PRESS) { |
| return; |
| } |
| |
| ASSERT(windows.count(window) == 1); |
| |
| WindowData* data = windows[window].get(); |
| switch (key) { |
| case GLFW_KEY_W: |
| AddWindow(); |
| break; |
| |
| case GLFW_KEY_L: |
| data->latched = !data->latched; |
| UpdateTitle(data); |
| break; |
| |
| case GLFW_KEY_R: |
| data->renderTriangle = !data->renderTriangle; |
| UpdateTitle(data); |
| break; |
| |
| case GLFW_KEY_D: |
| data->divisor *= 2; |
| if (data->divisor > 32) { |
| data->divisor = 1; |
| } |
| break; |
| |
| case GLFW_KEY_P: |
| switch (data->targetDesc.presentMode) { |
| case wgpu::PresentMode::Immediate: |
| data->targetDesc.presentMode = wgpu::PresentMode::Fifo; |
| break; |
| case wgpu::PresentMode::Fifo: |
| data->targetDesc.presentMode = wgpu::PresentMode::Mailbox; |
| break; |
| case wgpu::PresentMode::Mailbox: |
| data->targetDesc.presentMode = wgpu::PresentMode::Immediate; |
| break; |
| } |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| int main(int argc, const char* argv[]) { |
| // Setup GLFW |
| glfwSetErrorCallback([](int code, const char* message) { |
| dawn::ErrorLog() << "GLFW error " << code << " " << message; |
| }); |
| if (!glfwInit()) { |
| return 1; |
| } |
| |
| // Choose an adapter we like. |
| // TODO: allow switching the window between devices. |
| DawnProcTable procs = dawn::native::GetProcs(); |
| dawnProcSetProcs(&procs); |
| |
| instance = std::make_unique<dawn::native::Instance>(); |
| instance->DiscoverDefaultAdapters(); |
| |
| std::vector<dawn::native::Adapter> adapters = instance->GetAdapters(); |
| dawn::native::Adapter chosenAdapter; |
| for (dawn::native::Adapter& adapter : adapters) { |
| wgpu::AdapterProperties properties; |
| adapter.GetProperties(&properties); |
| if (properties.backendType != wgpu::BackendType::Null) { |
| chosenAdapter = adapter; |
| break; |
| } |
| } |
| ASSERT(chosenAdapter); |
| |
| // Setup the device on that adapter. |
| device = wgpu::Device::Acquire(chosenAdapter.CreateDevice()); |
| device.SetUncapturedErrorCallback( |
| [](WGPUErrorType errorType, const char* message, void*) { |
| const char* errorTypeName = ""; |
| switch (errorType) { |
| case WGPUErrorType_Validation: |
| errorTypeName = "Validation"; |
| break; |
| case WGPUErrorType_OutOfMemory: |
| errorTypeName = "Out of memory"; |
| break; |
| case WGPUErrorType_Unknown: |
| errorTypeName = "Unknown"; |
| break; |
| case WGPUErrorType_DeviceLost: |
| errorTypeName = "Device lost"; |
| break; |
| default: |
| UNREACHABLE(); |
| return; |
| } |
| dawn::ErrorLog() << errorTypeName << " error: " << message; |
| }, |
| nullptr); |
| queue = device.GetQueue(); |
| |
| // The hacky pipeline to render a triangle. |
| utils::ComboRenderPipelineDescriptor pipelineDesc; |
| pipelineDesc.vertex.module = utils::CreateShaderModule(device, R"( |
| @stage(vertex) fn main(@builtin(vertex_index) VertexIndex : u32) |
| -> @builtin(position) vec4<f32> { |
| var pos = array<vec2<f32>, 3>( |
| vec2<f32>( 0.0, 0.5), |
| vec2<f32>(-0.5, -0.5), |
| vec2<f32>( 0.5, -0.5) |
| ); |
| return vec4<f32>(pos[VertexIndex], 0.0, 1.0); |
| })"); |
| pipelineDesc.cFragment.module = utils::CreateShaderModule(device, R"( |
| @stage(fragment) fn main() -> @location(0) vec4<f32> { |
| return vec4<f32>(1.0, 0.0, 0.0, 1.0); |
| })"); |
| // BGRA shouldn't be hardcoded. Consider having a map[format -> pipeline]. |
| pipelineDesc.cTargets[0].format = wgpu::TextureFormat::BGRA8Unorm; |
| trianglePipeline = device.CreateRenderPipeline(&pipelineDesc); |
| |
| // Craete the first window, since the example exits when there are no windows. |
| AddWindow(); |
| |
| while (windows.size() != 0) { |
| utils::ScopedAutoreleasePool pool; |
| glfwPollEvents(); |
| |
| for (auto it = windows.begin(); it != windows.end();) { |
| GLFWwindow* window = it->first; |
| |
| if (glfwWindowShouldClose(window)) { |
| glfwDestroyWindow(window); |
| it = windows.erase(it); |
| } else { |
| it++; |
| } |
| } |
| |
| for (auto& it : windows) { |
| WindowData* data = it.second.get(); |
| |
| SyncFromWindow(data); |
| if (!IsSameDescriptor(data->currentDesc, data->targetDesc) && !data->latched) { |
| data->swapchain = device.CreateSwapChain(data->surface, &data->targetDesc); |
| data->currentDesc = data->targetDesc; |
| } |
| UpdateTitle(data); |
| DoRender(data); |
| } |
| } |
| } |