Swap chains, part 2 (#94)

examples/HelloUBO.cpp

@@ -19,9 +19,10 @@
 
 nxt::Device device;
 nxt::Queue queue;
+nxt::SwapChain swapchain;
+nxt::TextureView depthStencilView;
 nxt::RenderPipeline pipeline;
 nxt::RenderPass renderpass;
-nxt::Framebuffer framebuffer;
 nxt::Buffer buffer;
 nxt::BindGroup bindGroup;
 
@@ -31,6 +32,8 @@ void init() {
     device = CreateCppNXTDevice();
 
     queue = device.CreateQueueBuilder().GetResult();
+    swapchain = GetSwapChain(device);
+    swapchain.Configure(nxt::TextureFormat::R8G8B8A8Unorm, 640, 480);
 
     nxt::ShaderModule vsModule = utils::CreateShaderModule(device, nxt::ShaderStage::Vertex, R"(
         #version 450
@@ -60,7 +63,9 @@ void init() {
         .SetBindGroupLayout(0, bgl)
         .GetResult();
 
-    utils::CreateDefaultRenderPass(device, &renderpass, &framebuffer);
+    renderpass = CreateDefaultRenderPass(device);
+    depthStencilView = CreateDefaultDepthStencilView(device);
+
     pipeline = device.CreateRenderPipelineBuilder()
         .SetSubpass(renderpass, 0)
         .SetLayout(pl)
@@ -93,6 +98,10 @@ void frame() {
     buffer.TransitionUsage(nxt::BufferUsageBit::TransferDst);
     buffer.SetSubData(0, sizeof(s) / sizeof(uint32_t), reinterpret_cast<uint32_t*>(&s));
 
+    nxt::Texture backbuffer;
+    nxt::Framebuffer framebuffer;
+    GetNextFramebuffer(device, renderpass, swapchain, depthStencilView, &backbuffer, &framebuffer);
+
     nxt::CommandBuffer commands = device.CreateCommandBufferBuilder()
         .BeginRenderPass(renderpass, framebuffer)
         .BeginRenderSubpass()
@@ -105,7 +114,9 @@ void frame() {
         .GetResult();
 
     queue.Submit(1, &commands);
-    DoSwapBuffers();
+    backbuffer.TransitionUsage(nxt::TextureUsageBit::Present);
+    swapchain.Present(backbuffer);
+    DoFlush();
 }
 
 int main(int argc, const char* argv[]) {