renderer.cpp

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#include "VEngine/Gfx/Renderer.hpp"
 
void ven::Renderer::createCommandBuffers()
{
    m_commandBuffers.resize(MAX_FRAMES_IN_FLIGHT);
    VkCommandBufferAllocateInfo allocInfo{};
    allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
    allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
    allocInfo.commandPool = m_device.getCommandPool();
    allocInfo.commandBufferCount = static_cast<uint32_t>(m_commandBuffers.size());
 
    if (vkAllocateCommandBuffers(m_device.device(), &allocInfo, m_commandBuffers.data()) != VK_SUCCESS) {
        throw std::runtime_error("Failed to allocate command buffers");
    }
}
 
void ven::Renderer::freeCommandBuffers()
{
    vkFreeCommandBuffers(m_device.device(), m_device.getCommandPool(), static_cast<uint32_t>(m_commandBuffers.size()), m_commandBuffers.data());
    m_commandBuffers.clear();
}
 
void ven::Renderer::recreateSwapChain()
{
    VkExtent2D extent = m_window.getExtent();
    while (extent.width == 0 || extent.height == 0) {
        extent = m_window.getExtent();
        glfwWaitEvents();
    }
    vkDeviceWaitIdle(m_device.device());
    if (m_swapChain == nullptr) {
        m_swapChain = std::make_unique<SwapChain>(m_device, extent);
    } else {
        std::shared_ptr<SwapChain> oldSwapChain = std::move(m_swapChain);
        m_swapChain = std::make_unique<SwapChain>(m_device, extent, oldSwapChain);
        if (!oldSwapChain->compareSwapFormats(*m_swapChain)) {
            throw std::runtime_error("Swap chain image/depth format changed");
        }
    }
    // well be back
}
 
VkCommandBuffer ven::Renderer::beginFrame()
{
    assert(!m_isFrameStarted && "Can't start new frame while previous one is still in progress");
 
    const VkResult result = m_swapChain->acquireNextImage(&m_currentImageIndex);
    if (result == VK_ERROR_OUT_OF_DATE_KHR) {
        recreateSwapChain();
        return nullptr;
    }
 
    if (result != VK_SUCCESS && result != VK_SUBOPTIMAL_KHR) {
        throw std::runtime_error("Failed to acquire swap chain image");
    }
 
    m_isFrameStarted = true;
 
    VkCommandBuffer_T *commandBuffer = getCurrentCommandBuffer();
    VkCommandBufferBeginInfo beginInfo{};
    beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
 
    if (vkBeginCommandBuffer(commandBuffer, &beginInfo) != VK_SUCCESS) {
        throw std::runtime_error("Failed to begin recording command m_buffer");
    }
    return commandBuffer;
}
 
void ven::Renderer::endFrame()
{
    assert(m_isFrameStarted && "Can't end frame that hasn't been started");
 
    VkCommandBuffer_T *commandBuffer = getCurrentCommandBuffer();
    if (vkEndCommandBuffer(commandBuffer) != VK_SUCCESS) {
        throw std::runtime_error("Failed to record command buffer");
    }
    if (const VkResult result = m_swapChain->submitCommandBuffers(&commandBuffer, &m_currentImageIndex); result == VK_ERROR_OUT_OF_DATE_KHR || result == VK_SUBOPTIMAL_KHR || m_window.wasWindowResized()) {
        m_window.resetWindowResizedFlag();
        recreateSwapChain();
    }
    else if (result != VK_SUCCESS) {
        throw std::runtime_error("Failed to submit command buffer");
    }
 
    m_isFrameStarted = false;
    m_currentFrameIndex = (m_currentFrameIndex + 1) % MAX_FRAMES_IN_FLIGHT;
}
 
void ven::Renderer::beginSwapChainRenderPass(const VkCommandBuffer commandBuffer) const
{
    assert(m_isFrameStarted && "Can't begin render pass when frame not in progress");
    assert(commandBuffer == getCurrentCommandBuffer() && "Can't begin render pass on command m_buffer from a different frame");
 
    VkRenderPassBeginInfo renderPassInfo{};
    renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
    renderPassInfo.renderPass = m_swapChain->getRenderPass();
    renderPassInfo.framebuffer = m_swapChain->getFrameBuffer(m_currentImageIndex);
 
    renderPassInfo.renderArea.offset = {.x=0, .y=0};
    renderPassInfo.renderArea.extent = m_swapChain->getSwapChainExtent();
 
    renderPassInfo.clearValueCount = static_cast<uint32_t>(m_clearValues.size());
    renderPassInfo.pClearValues = m_clearValues.data();
 
    vkCmdBeginRenderPass(commandBuffer, &renderPassInfo, VK_SUBPASS_CONTENTS_INLINE);
 
    VkViewport viewport{};
    viewport.x = 0.0F;
    viewport.y = 0.0F;
    viewport.width = static_cast<float>(m_swapChain->getSwapChainExtent().width);
    viewport.height = static_cast<float>(m_swapChain->getSwapChainExtent().height);
    viewport.minDepth = 0.0F;
    viewport.maxDepth = 1.0F;
    const VkRect2D scissor{{0, 0}, m_swapChain->getSwapChainExtent()};
    vkCmdSetViewport(commandBuffer, 0, 1, &viewport);
    vkCmdSetScissor(commandBuffer, 0, 1, &scissor);
}
 
void ven::Renderer::endSwapChainRenderPass(const VkCommandBuffer commandBuffer) const
{
    assert(m_isFrameStarted && "Can't end render pass when frame not in progress");
    assert(commandBuffer == getCurrentCommandBuffer() && "Can't end render pass on command m_buffer from a different frame");
 
    vkCmdEndRenderPass(commandBuffer);
}