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// 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 "common/Assert.h"
#include "common/Log.h"
#include "utils/ComboRenderPipelineDescriptor.h"
#include "utils/GLFWUtils.h"
#include "utils/WGPUHelpers.h"
#include <dawn/dawn_proc.h>
#include <dawn/webgpu_cpp.h>
#include <dawn_native/DawnNative.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"(
let pos : array<vec2<f32>, 3> = array<vec2<f32>, 3>(
vec2<f32>( 0.0, 0.5),
vec2<f32>(-0.5, -0.5),
vec2<f32>( 0.5, -0.5)
);
[[stage(vertex)]] fn main([[builtin(vertex_index)]] VertexIndex : u32)
-> [[builtin(position)]] vec4<f32> {
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) {
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);
}
}
}