1 files changed, 156 insertions, 0 deletions

diff --git a/engine/xe_renderer.cpp b/engine/xe_renderer.cpp
new file mode 100644
index 0000000..2ed4f51
--- /dev/null
+++ b/engine/xe_renderer.cpp
@@ -0,0 +1,156 @@
+#include "xe_renderer.hpp"
+
+#include "xe_device.hpp"
+#include "xe_game_object.hpp"
+#include "xe_swap_chain.hpp"
+#include "xe_window.hpp"
+#include <memory>
+#include <vulkan/vulkan_core.h>
+
+#include <array>
+#include <cassert>
+#include <stdexcept>
+
+namespace xe {
+
+XeRenderer::XeRenderer(XeWindow& window, XeDevice& device) : xeWindow{window}, xeDevice{device} {
+  recreateSwapChain();
+  createCommandBuffers();
+}
+
+XeRenderer::~XeRenderer() { freeCommandBuffers(); }
+
+void XeRenderer::recreateSwapChain() { 
+  auto extent = xeWindow.getExtent();
+  while (extent.width == 0 || extent.height == 0) {
+    extent = xeWindow.getExtent();
+    glfwWaitEvents();
+  }
+
+  vkDeviceWaitIdle(xeDevice.device());
+  
+  if(xeSwapChain == nullptr) {
+    xeSwapChain = std::make_unique<XeSwapChain>(xeDevice, extent);
+  } else {
+    std::shared_ptr<XeSwapChain> oldSwapChain = std::move(xeSwapChain);
+    xeSwapChain = std::make_unique<XeSwapChain>(xeDevice, extent, oldSwapChain);
+
+    if(!oldSwapChain->compareSwapFormats(*xeSwapChain.get())) {
+      throw std::runtime_error("Swap chain image (or depth) format has changed");
+    }
+
+  }
+
+  // we'll come back to this in just a moment
+}
+
+void XeRenderer::createCommandBuffers() {
+  
+  commandBuffers.resize(XeSwapChain::MAX_FRAMES_IN_FLIGHT);
+
+  VkCommandBufferAllocateInfo allocInfo{};
+  allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
+  allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
+  allocInfo.commandPool = xeDevice.getCommandPool();
+  allocInfo.commandBufferCount = static_cast<uint32_t>(commandBuffers.size());
+
+  if(vkAllocateCommandBuffers(xeDevice.device(), &allocInfo, commandBuffers.data()) != VK_SUCCESS) {
+    throw std::runtime_error("failed to allocate command buffers!");
+  }
+
+}
+
+void XeRenderer::freeCommandBuffers() {
+  vkFreeCommandBuffers(
+    xeDevice.device(), 
+    xeDevice.getCommandPool(), 
+    static_cast<uint32_t>(commandBuffers.size()),
+    commandBuffers.data());
+    commandBuffers.clear();
+}
+
+VkCommandBuffer XeRenderer::beginFrame() {
+  assert(!isFrameStarted && "Can't acll beingFrame while already in progress");
+
+  auto result = xeSwapChain->acquireNextImage(&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");
+  }
+
+  isFrameStarted = true;
+
+  auto 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 buffers");
+  }
+  return commandBuffer;
+}
+
+void XeRenderer::endFrame() {
+  assert(isFrameStarted && "Can't call endFrame while frame is not in progress");
+  auto commandBuffer = getCurrentCommandBuffer();
+  if(vkEndCommandBuffer(commandBuffer) != VK_SUCCESS) {
+    throw std::runtime_error("failed to record command buffer");
+  }
+
+  auto result = xeSwapChain->submitCommandBuffers(&commandBuffer, &currentImageIndex);
+  if(result == VK_ERROR_OUT_OF_DATE_KHR || result == VK_SUBOPTIMAL_KHR || xeWindow.wasWindowResized()) {
+    xeWindow.resetWindowResizedFlag();
+    recreateSwapChain();
+  }
+
+  isFrameStarted = false;
+  currentFrameIndex = (currentFrameIndex + 1) % XeSwapChain::MAX_FRAMES_IN_FLIGHT;
+}
+
+void XeRenderer::beginSwapChainRenderPass(VkCommandBuffer commandBuffer){
+  assert(isFrameStarted && "Can't call beginSwapChainRenderPass while frame is not in progress");
+  assert(commandBuffer == getCurrentCommandBuffer() && "Can't begin render pass on command buffer from a different frame");
+
+  VkRenderPassBeginInfo renderPassInfo{};
+  renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
+  renderPassInfo.renderPass = xeSwapChain->getRenderPass();
+  renderPassInfo.framebuffer = xeSwapChain->getFrameBuffer(currentImageIndex);
+
+  renderPassInfo.renderArea.offset = {0, 0};
+  renderPassInfo.renderArea.extent = xeSwapChain->getSwapChainExtent();
+
+  std::array<VkClearValue, 2> clearValues{};
+  clearValues[0].color = {0.1f, 0.1f, 0.1f, 1.0f};
+  clearValues[1].depthStencil = {1.0f, 0};
+  renderPassInfo.clearValueCount = static_cast<uint32_t>(clearValues.size());
+  renderPassInfo.pClearValues = clearValues.data();
+
+  vkCmdBeginRenderPass(commandBuffer, &renderPassInfo, VK_SUBPASS_CONTENTS_INLINE);
+
+  VkViewport viewport{};
+  viewport.x = 0.0f;
+  viewport.y = static_cast<float>(xeSwapChain->getSwapChainExtent().height);
+  viewport.width = static_cast<float>(xeSwapChain->getSwapChainExtent().width);
+  viewport.height = -static_cast<float>(xeSwapChain->getSwapChainExtent().height);
+  viewport.minDepth = 0.0f;
+  viewport.maxDepth = 1.0f;
+  VkRect2D scissor{{0, 0}, xeSwapChain->getSwapChainExtent()};
+  vkCmdSetViewport(commandBuffer, 0, 1, &viewport);
+  vkCmdSetScissor(commandBuffer, 0, 1, &scissor);
+}
+
+void XeRenderer::endSwapChainRenderPass(VkCommandBuffer commandBuffer){
+  assert(isFrameStarted && "Can't call endSwapChainRenderPass while frame is not in progress");
+  assert(commandBuffer == getCurrentCommandBuffer() && "Can't end render pass on command buffer from a different frame");
+
+  vkCmdEndRenderPass(commandBuffer);
+
+}
+
+}
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