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10.a-render-to-texture.cpp
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10.a-render-to-texture.cpp
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#include "../framework/vulkanApp.h"
#include "../framework/utilities.h"
class RenderToTextureApp : public VulkanApp
{
struct Framebuffer
{
constexpr static uint32_t width = 128;
constexpr static uint32_t height = 128;
std::shared_ptr<magma::ImageView> colorView;
std::shared_ptr<magma::ImageView> depthView;
std::shared_ptr<magma::RenderPass> renderPass;
std::shared_ptr<magma::Framebuffer> framebuffer;
} fb;
struct RtDescriptorSetTable : magma::DescriptorSetTable
{
magma::descriptor::UniformBuffer world = 0;
MAGMA_REFLECT(world)
} setTableRt;
struct TxDescriptorSetTable : magma::DescriptorSetTable
{
magma::descriptor::CombinedImageSampler texture = 0;
MAGMA_REFLECT(texture)
} setTableTx;
std::shared_ptr<magma::VertexBuffer> vertexBuffer;
std::shared_ptr<magma::UniformBuffer<rapid::matrix>> uniformBuffer;
std::shared_ptr<magma::Sampler> nearestSampler;
std::unique_ptr<magma::CommandBuffer> rtCmdBuffer;
std::shared_ptr<magma::Semaphore> rtSemaphore;
std::shared_ptr<magma::DescriptorSet> rtDescriptorSet;
std::shared_ptr<magma::GraphicsPipeline> rtPipeline;
std::shared_ptr<magma::DescriptorSet> txDescriptorSet;
std::shared_ptr<magma::GraphicsPipeline> txPipeline;
public:
RenderToTextureApp(const AppEntry& entry):
VulkanApp(entry, TEXT("10.a - Render to texture"), 512, 512)
{
initialize();
createFramebuffer({fb.width, fb.height});
createVertexBuffer();
createUniformBuffer();
createSampler();
setupDescriptorSets();
setupPipelines();
recordOffscreenCommandBuffer(fb);
recordCommandBuffer(Buffer::Front);
recordCommandBuffer(Buffer::Back);
timer->run();
}
void render(uint32_t bufferIndex) override
{
updateWorldTransform();
constexpr VkPipelineStageFlags stageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
graphicsQueue->submit(rtCmdBuffer, stageMask,
presentFinished, // Wait for swapchain
rtSemaphore, // Signal when render-to-texture finished
nullptr);
graphicsQueue->submit(commandBuffers[bufferIndex], stageMask,
rtSemaphore, // Wait for render-to-texture
renderFinished, // Semaphore to be signaled when command buffer completed execution
*waitFence); // Fence to be signaled when command buffer completed execution
}
void updateWorldTransform()
{
constexpr float speed = 0.02f;
static float angle = 0.f;
const float step = timer->millisecondsElapsed() * speed;
angle += step;
const rapid::matrix roll = rapid::rotationZ(rapid::radians(angle));
magma::helpers::mapScoped(uniformBuffer,
[&roll](auto *world)
{
*world = roll;
});
}
void createFramebuffer(const VkExtent2D& extent)
{
constexpr bool sampled = true;
constexpr bool dontSampled = false;
constexpr VkFormat colorFormat = VK_FORMAT_R8G8B8A8_UNORM;
// Create color attachment
std::unique_ptr<magma::Image> color = std::make_unique<magma::ColorAttachment>(device, colorFormat, extent, 1, 1, sampled);
fb.colorView = std::make_shared<magma::UniqueImageView>(std::move(color));
// Create depth attachment
const VkFormat depthFormat = utilities::getSupportedDepthFormat(physicalDevice, false, true);
std::unique_ptr<magma::Image> depth = std::make_unique<magma::DepthStencilAttachment>(device, depthFormat, extent, 1, 1, dontSampled);
fb.depthView = std::make_shared<magma::UniqueImageView>(std::move(depth));
// Don't care about initial layout
constexpr VkImageLayout initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
// Define that color attachment can be cleared, can store shader output and should be read-only image
const magma::AttachmentDescription colorAttachment(colorFormat, 1,
magma::op::clearStore, // Color clear, store
magma::op::dontCare, // Inapplicable
initialLayout,
VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL); // Should be read-only in the shader when a render pass instance ends
// Define that depth attachment can be cleared and can store shader output
const magma::AttachmentDescription depthAttachment(depthFormat, 1,
magma::op::clearStore, // Depth clear, store
magma::op::dontCare, // Don't care about stencil
initialLayout,
VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL); // Stay as depth/stencil attachment
// Render pass defines attachment formats, load/store operations and final layouts
fb.renderPass = std::shared_ptr<magma::RenderPass>(new magma::RenderPass(
device, {colorAttachment, depthAttachment}));
// Framebuffer defines render pass, color/depth/stencil image views and dimensions
fb.framebuffer = std::shared_ptr<magma::Framebuffer>(new magma::Framebuffer(
fb.renderPass, {fb.colorView, fb.depthView}));
}
void createVertexBuffer()
{
struct Vertex
{
float x, y;
float u, v;
};
constexpr float w = 0.75f, h = 0.75f;
alignas(MAGMA_ALIGNMENT) const Vertex vertices[] = {
{-w, -h, 0.f, 0.f},
{-w, h, 0.f, 1.f},
{ w, -h, 1.f, 0.f},
{ w, h, 1.f, 1.f}
};
vertexBuffer = magma::helpers::makeVertexBuffer(vertices, cmdBufferCopy);
}
void createUniformBuffer()
{
uniformBuffer = std::make_shared<magma::UniformBuffer<rapid::matrix>>(device, false);
}
void createSampler()
{
nearestSampler = std::make_shared<magma::Sampler>(device, magma::sampler::magMinMipNearestClampToEdge);
}
void setupDescriptorSets()
{
setTableRt.world = uniformBuffer;
rtDescriptorSet = std::make_shared<magma::DescriptorSet>(descriptorPool,
setTableRt, VK_SHADER_STAGE_VERTEX_BIT,
nullptr, 0, shaderReflectionFactory, "triangle");
setTableTx.texture = {fb.colorView, nearestSampler};
txDescriptorSet = std::make_shared<magma::DescriptorSet>(descriptorPool,
setTableTx, VK_SHADER_STAGE_FRAGMENT_BIT,
nullptr, 0, shaderReflectionFactory, "tex");
}
void setupPipelines()
{
std::unique_ptr<magma::PipelineLayout> rtLayout = std::make_unique<magma::PipelineLayout>(rtDescriptorSet->getLayout());
rtPipeline = std::make_shared<GraphicsPipeline>(device,
"triangle", "fill",
magma::renderstate::nullVertexInput,
magma::renderstate::triangleList,
magma::renderstate::fillCullBackCcw,
magma::renderstate::dontMultisample,
magma::renderstate::depthAlwaysDontWrite,
magma::renderstate::dontBlendRgb,
std::move(rtLayout),
fb.renderPass, 0,
pipelineCache);
std::unique_ptr<magma::PipelineLayout> txLayout = std::make_unique<magma::PipelineLayout>(txDescriptorSet->getLayout());
txPipeline = std::make_shared<GraphicsPipeline>(device,
"passthrough", "tex",
magma::renderstate::pos2fTex2f,
magma::renderstate::triangleStrip,
magma::renderstate::fillCullBackCcw,
magma::renderstate::dontMultisample,
magma::renderstate::depthAlwaysDontWrite,
magma::renderstate::dontBlendRgb,
std::move(txLayout),
renderPass, 0,
pipelineCache);
}
void recordOffscreenCommandBuffer(const Framebuffer& fb)
{
/* VK_COMMAND_BUFFER_USAGE_SIMULTANEOUS_USE_BIT specifies that
a command buffer can be resubmitted to a queue while it is in
the pending state, and recorded into multiple primary command buffers. */
rtCmdBuffer = std::make_unique<magma::PrimaryCommandBuffer>(commandPools[0]);
rtCmdBuffer->begin(VK_COMMAND_BUFFER_USAGE_SIMULTANEOUS_USE_BIT);
{
rtCmdBuffer->beginRenderPass(fb.renderPass, fb.framebuffer,
{
magma::ClearColor(0.35f, 0.53f, 0.7f, 1.f),
magma::clear::depthOne
});
{
rtCmdBuffer->setViewport(magma::Viewport(0, 0, fb.framebuffer->getExtent()));
rtCmdBuffer->setScissor(magma::Scissor(0, 0, fb.framebuffer->getExtent()));
rtCmdBuffer->bindDescriptorSet(rtPipeline, 0, rtDescriptorSet);
rtCmdBuffer->bindPipeline(rtPipeline);
rtCmdBuffer->draw(3, 0);
}
rtCmdBuffer->endRenderPass();
}
rtCmdBuffer->end();
rtSemaphore = std::make_shared<magma::Semaphore>(device);
}
void recordCommandBuffer(uint32_t index)
{
auto& cmdBuffer = commandBuffers[index];
cmdBuffer->begin();
{
cmdBuffer->beginRenderPass(renderPass, framebuffers[index],
{
magma::clear::gray
});
{
cmdBuffer->setViewport(0, 0, width, height);
cmdBuffer->setScissor(0, 0, width, height);
cmdBuffer->bindDescriptorSet(txPipeline, 0, txDescriptorSet);
cmdBuffer->bindPipeline(txPipeline);
cmdBuffer->bindVertexBuffer(0, vertexBuffer);
cmdBuffer->draw(4, 0);
}
cmdBuffer->endRenderPass();
}
cmdBuffer->end();
}
};
std::unique_ptr<IApplication> appFactory(const AppEntry& entry)
{
return std::unique_ptr<RenderToTextureApp>(new RenderToTextureApp(entry));
}