Implemented ping-pong blur demo

vcoda · Oct 5, 2020 · f7f1b85 · f7f1b85
1 parent f92262f
commit f7f1b85
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diff --git a/aggregated-graphics-samples.sln b/aggregated-graphics-samples.sln
@@ -139,6 +139,12 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "blur-gaussian", "blur-gauss
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+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "blur-ping-pong", "blur-ping-pong\blur-ping-pong.vcxproj", "{1C51CC8A-6183-43C7-A231-9066FA95587A}"
+	ProjectSection(ProjectDependencies) = postProject
+		{8D9D4A3E-439A-4210-8879-259B20D992CA} = {8D9D4A3E-439A-4210-8879-259B20D992CA}
+		{67B01ECD-2613-4FA0-84F7-87F5BCF40EB1} = {67B01ECD-2613-4FA0-84F7-87F5BCF40EB1}
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x64 = Debug|x64
@@ -315,6 +321,14 @@ Global
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 	GlobalSection(SolutionProperties) = preSolution
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diff --git a/blur-ping-pong/blur-ping-pong.cpp b/blur-ping-pong/blur-ping-pong.cpp
@@ -0,0 +1,146 @@
+#include "graphicsApp.h"
+
+class PingPongBlur : public GraphicsApp
+{
+    static constexpr uint32_t numPasses = 32;
+
+    struct Constants
+    {
+        VkBool32 ping;
+    };
+
+    struct Pass
+    {
+        std::shared_ptr<magma::aux::ColorFramebuffer> framebuffer;
+        std::shared_ptr<magma::DescriptorSet> set;
+        std::shared_ptr<magma::GraphicsPipeline> pipeline;
+    } ping, pong;
+
+    std::shared_ptr<magma::GraphicsPipeline> checkerboardPipeline;
+
+    bool blurImage = true;
+
+public:
+    explicit PingPongBlur(const AppEntry& entry):
+        GraphicsApp(entry, TEXT("Ping-pong blur"), 1280, 32 * 22, false)
+    {
+        createPingPongPasses();
+        setupGraphicsPipelines();
+        renderScene(FrontBuffer);
+        renderScene(BackBuffer);
+    }
+
+    virtual void render(uint32_t bufferIndex) override
+    {
+        queue->submit(commandBuffers[bufferIndex],
+            VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT,
+            presentFinished, // Wait for swapchain
+            renderFinished,
+            waitFences[bufferIndex]);
+    }
+
+    virtual void onKeyDown(char key, int repeat, uint32_t flags) override
+    {
+        switch (key)
+        {
+        case AppKey::Space:
+            blurImage = !blurImage;
+            renderScene(FrontBuffer);
+            renderScene(BackBuffer);
+            break;
+        }
+        VulkanApp::onKeyDown(key, repeat, flags);
+    }
+
+    Pass createPass(std::shared_ptr<magma::DescriptorSetLayout> layout, bool ping)
+    {
+        Pass pass;
+        pass.framebuffer = std::make_shared<magma::aux::ColorFramebuffer>(device,
+            VK_FORMAT_R8G8B8A8_UNORM, msaaFramebuffer->getExtent(), false);
+        pass.set = descriptorPool->allocateDescriptorSet(layout);
+        const Constants constant = {MAGMA_BOOLEAN(ping)};
+        const magma::SpecializationEntry entry(0, &Constants::ping);
+        auto specialization = std::make_shared<magma::Specialization>(constant, entry);
+        pass.pipeline = createFullscreenPipeline("quad.o", "bilerp.o", std::move(specialization), std::move(layout), pass.framebuffer);
+        return pass;
+    }
+
+    void createPingPongPasses()
+    {
+        auto layout = std::make_shared<magma::DescriptorSetLayout>(device,
+            magma::bindings::VertexFragmentStageBinding(0, magma::descriptors::CombinedImageSampler(1)));
+        ping = createPass(layout, true);
+        pong = createPass(layout, false);
+        ping.set->update(0, pong.framebuffer->getColorView(), bilinearRepeat); // Use hardware bilinear filtering
+        pong.set->update(0, ping.framebuffer->getColorView(), bilinearRepeat); // Use hardware bilinear filtering
+    }
+
+    void setupGraphicsPipelines()
+    {
+        checkerboardPipeline = createFullscreenPipeline("quad.o", "checkerboard.o", nullptr, nullptr, pong.framebuffer);
+        bltRect = std::make_unique<magma::aux::BlitRectangle>(renderPass);
+    }
+
+    void renderScene(uint32_t bufferIndex)
+    {
+        std::shared_ptr<magma::CommandBuffer> cmdBuffer = commandBuffers[bufferIndex];
+        cmdBuffer->begin();
+        {
+            if (!blurImage)
+                checkerboardPass(cmdBuffer, bufferIndex);
+            else
+            {
+                if (FrontBuffer == bufferIndex)
+                {   // Draw once
+                    checkerboardPass(cmdBuffer, bufferIndex);
+                    blurPass(cmdBuffer);
+                }
+                blitPass(cmdBuffer, bufferIndex);
+            }
+        }
+        cmdBuffer->end();
+    }
+
+    void checkerboardPass(std::shared_ptr<magma::CommandBuffer> cmdBuffer, uint32_t bufferIndex)
+    {
+        if (blurImage)
+            cmdBuffer->beginRenderPass(pong.framebuffer->getRenderPass(), pong.framebuffer->getFramebuffer());
+        else // Draw to swapchain
+            cmdBuffer->beginRenderPass(renderPass, framebuffers[bufferIndex]);
+        {
+            cmdBuffer->bindPipeline(checkerboardPipeline);
+            cmdBuffer->draw(4, 0);
+        }
+        cmdBuffer->endRenderPass();
+    }
+
+    void blurPass(std::shared_ptr<magma::CommandBuffer> cmdBuffer)
+    {
+        for (uint32_t i = 0; i < numPasses; ++i)
+        {
+            const Pass& pass = i % 2 ? pong : ping;
+            cmdBuffer->beginRenderPass(pass.framebuffer->getRenderPass(), pass.framebuffer->getFramebuffer());
+            {
+                cmdBuffer->bindPipeline(pass.pipeline);
+                cmdBuffer->bindDescriptorSet(pass.pipeline, pass.set);
+                cmdBuffer->draw(4, 0);
+            }
+            cmdBuffer->endRenderPass();
+        }
+    }
+
+    void blitPass(std::shared_ptr<magma::CommandBuffer> cmdBuffer, uint32_t bufferIndex)
+    {
+        cmdBuffer->beginRenderPass(renderPass, framebuffers[bufferIndex]);
+        {
+            const VkRect2D rc{0, 0, width, height};
+            bltRect->blit(cmdBuffer, pong.framebuffer->getColorView(), VK_FILTER_NEAREST, rc);
+        }
+        cmdBuffer->endRenderPass();
+    }
+};
+
+std::unique_ptr<IApplication> appFactory(const AppEntry& entry)
+{
+    return std::unique_ptr<PingPongBlur>(new PingPongBlur(entry));
+}
diff --git a/blur-ping-pong/blur-ping-pong.vcxproj b/blur-ping-pong/blur-ping-pong.vcxproj
@@ -0,0 +1,184 @@
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