Set up Vertex Buffer

Makefile

@@ -6,7 +6,7 @@ SRC = $(shell find . -name "*.cpp")
 SHDRSRC = $(shell find . -name "*.frag" -o -name "*vert")
 SPV = $(SHDRSRC:%.vert=%.spv) $(SHDRSRC:%.frag=%.spv)
 OBJ = $(SRC:%.cpp=%.o)
-
+MAKEFLAGS += -j16
 BIN=build/agnosiaengine
 
 .PHONY: all

src/devicelibrary.cpp

@@ -264,7 +264,7 @@ namespace DeviceControl {
     // Do NOT blend with other windows on the system.
     createSwapChainInfo.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
     createSwapChainInfo.presentMode = presentMode;
-    // This is interesting, clip pixels that are obscured for performance, but that means you wont be able to reaf them reliably..
+    // This is interesting, clip pixels that are obscured for performance, but that means you wont be able to read them reliably..
     // I am curious if this would affect screen-space rendering techniques, may be something to note.
     createSwapChainInfo.clipped = VK_TRUE;
     // This is something that needs to be implemented later, operations like resizing the window invalidate the swap chain and 

src/entrypoint.cpp

@@ -1,8 +1,10 @@
 #include "entrypoint.h"
+#include "graphics/buffers.h"
 DeviceControl::devicelibrary deviceLibs;
 Debug::vulkandebuglibs debugController;
 Graphics::graphicspipeline graphicsPipeline;
 RenderPresent::render renderPresentation;
+Buffers::bufferslibrary buffers;
 VkInstance vulkaninstance;
 
 // Getters and Setters!
@@ -40,7 +42,7 @@ void createInstance() {
   appInfo.applicationVersion = VK_MAKE_VERSION(1,0,0);          // Create a Major Minor Patch version number for the application!
   appInfo.pEngineName = "Agnosia Engine";                       // Give an internal name for the engine running
   appInfo.engineVersion = VK_MAKE_VERSION(1,0,0);               // Similar to the App version, give vulkan an *engine* version
-  appInfo.apiVersion = VK_API_VERSION_1_1;                      // Tell vulkan what the highest API version we will allow this program to run on
+  appInfo.apiVersion = VK_API_VERSION_1_3;                      // Tell vulkan what the highest API version we will allow this program to run on
   
   VkInstanceCreateInfo createInfo{};                            // Define parameters of new vulkan instance
   createInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;    // Tell vulkan this is a info structure 
@@ -52,7 +54,7 @@ void createInstance() {
 
 void initVulkan() {
   createInstance();
-  debugController.setupDebugMessenger(vulkaninstance);                // The debug messenger is out holy grail, it gives us Vulkan related debug info when built with the -DNDEBUG flag (as per the makefile)
+  debugController.setupDebugMessenger(vulkaninstance);                // The debug messenger is out holy grail, it gives us Vulkan related debug info when built with the -DDEBUG flag (as per the makefile)
   deviceLibs.createSurface(vulkaninstance, Global::window);
   deviceLibs.pickPhysicalDevice(vulkaninstance);
   deviceLibs.createLogicalDevice();
@@ -62,6 +64,7 @@ void initVulkan() {
   graphicsPipeline.createGraphicsPipeline();
   graphicsPipeline.createFramebuffers();
   graphicsPipeline.createCommandPool();
+  buffers.createVertexBuffer();
   graphicsPipeline.createCommandBuffer();
   renderPresentation.createSyncObject();
 }
@@ -76,6 +79,7 @@ void mainLoop() {                                               // This loop jus
 
 void cleanup() {                                                // Similar to the last handoff, destroy the utils in a safe manner in the library!
   renderPresentation.cleanupSwapChain();
+  buffers.destroyVertexBuffer();
   graphicsPipeline.destroyGraphicsPipeline();
   graphicsPipeline.destroyRenderPass();
   renderPresentation.destroyFenceSemaphores();

src/global.cpp

@@ -21,6 +21,7 @@ namespace Global {
   VkQueue graphicsQueue;
   VkQueue presentQueue;
   GLFWwindow* window;
+  
 
   Global::QueueFamilyIndices findQueueFamilies(VkPhysicalDevice device) {
     // First we feed in a integer we want to use to hold the number of queued items, that fills it, then we create that amount of default constructed *VkQueueFamilyProperties* structs. 

src/global.h

@@ -1,10 +1,13 @@
 #pragma once
+#include <glm/ext/vector_float2.hpp>
+#include <glm/ext/vector_float3.hpp>
 #include <iostream>
 #include <vector>
 #include <optional>
 #include <vulkan/vulkan_core.h>
 #include "debug/vulkandebuglibs.h"
 
+#include <array>
 #define GLFW_INCLUDE_VULKAN
 #include <GLFW/glfw3.h>
 
@@ -21,6 +24,34 @@ namespace Global {
   const int MAX_FRAMES_IN_FLIGHT = 2;
   extern GLFWwindow* window;
 
+  struct Vertex {
+    glm::vec2 pos;
+    glm::vec3 color;
+  
+    static VkVertexInputBindingDescription getBindingDescription() {
+      VkVertexInputBindingDescription bindingDescription{};
+      bindingDescription.binding = 0;
+      bindingDescription.stride = sizeof(Vertex);
+      bindingDescription.inputRate = VK_VERTEX_INPUT_RATE_VERTEX;
+
+      return bindingDescription;
+    }
+    static std::array<VkVertexInputAttributeDescription, 2> getAttributeDescriptions() {
+      std::array<VkVertexInputAttributeDescription, 2> attributeDescriptions{};
+
+      attributeDescriptions[0].binding = 0;
+      attributeDescriptions[0].location = 0;
+      attributeDescriptions[0].format = VK_FORMAT_R32G32_SFLOAT;
+      attributeDescriptions[0].offset = offsetof(Vertex, pos);
+
+      attributeDescriptions[1].binding = 0;
+      attributeDescriptions[1].location = 1;
+      attributeDescriptions[1].format = VK_FORMAT_R32G32B32_SFLOAT;
+      attributeDescriptions[1].offset = offsetof(Vertex, color);
+      return attributeDescriptions;
+    }
+  };
+
   const uint32_t WIDTH = 800;
   const uint32_t HEIGHT = 600;
 

src/graphics/buffers.cpp

@@ -0,0 +1,71 @@
+#include "buffers.h"
+#include <iostream>
+#include <vulkan/vulkan_core.h>
+
+VkBuffer vertexBuffer;
+VkDeviceMemory vertexBufferMemory;
+namespace Buffers {
+
+  const std::vector<Global::Vertex> vertices = {
+    {{-0.5f, -0.5f}, {1.0f, 0.0f, 0.0f}},
+    {{0.5f, -0.5f}, {0.0f, 1.0f, 0.0f}},
+    {{0.5f, 0.5f}, {0.0f, 0.0f, 1.0f}} 
+  };
+  uint32_t findMemoryType(uint32_t typeFilter, VkMemoryPropertyFlags properties) {
+    // Graphics cards offer different types of memory to allocate from, here we query to find the right type of memory for our needs.
+    // Query the available types of memory to iterate over.
+    VkPhysicalDeviceMemoryProperties memProperties;
+    vkGetPhysicalDeviceMemoryProperties(Global::physicalDevice, &memProperties);
+    // iterate over and see if any of the memory types match our needs, in this case, HOST_VISIBLE and HOST_COHERENT. These will be explained shortly.
+    for (uint32_t i = 0; i < memProperties.memoryTypeCount; i++) {
+      if ((typeFilter & (1 << i)) && (memProperties.memoryTypes[i].propertyFlags & properties) == properties) {
+        return i;
+      }
+    }
+    throw std::runtime_error("failed to find suitable memory type!");
+  }
+
+  void bufferslibrary::createVertexBuffer() {
+    // Create a Vertex Buffer to hold the vertex information in memory so it doesn't have to be hardcoded!
+    // Size denotes the size of the buffer in bytes, usage in this case is the buffer behaviour, using a bitwise OR.
+    // Sharing mode denostes the same as the images in the swap chain! in this case, only the graphics queue uses this buffer, so we make it exclusive.
+    VkBufferCreateInfo bufferInfo;
+    bufferInfo.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;  
+    bufferInfo.size = sizeof(vertices[0]) * vertices.size();
+    bufferInfo.usage = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT;
+    bufferInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
+    bufferInfo.pNext = NULL;
+    std::cerr << &bufferInfo << " " << &vertexBuffer << "\n";
+    if (vkCreateBuffer(Global::device, &bufferInfo, nullptr, &vertexBuffer) != VK_SUCCESS) {
+      throw std::runtime_error("failed to create vertex buffer!");
+    }
+    // Query the memory requirements of the buffer.
+    VkMemoryRequirements memRequirements;
+    vkGetBufferMemoryRequirements(Global::device, vertexBuffer, &memRequirements);
+  
+    VkMemoryAllocateInfo allocInfo{};
+    allocInfo.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
+    allocInfo.allocationSize = memRequirements.size;
+    allocInfo.memoryTypeIndex = findMemoryType(memRequirements.memoryTypeBits, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);
+    
+    if (vkAllocateMemory(Global::device, &allocInfo, nullptr, &vertexBufferMemory) != VK_SUCCESS) {
+      throw std::runtime_error("failed to allocate vertex buffer memory!");
+    }
+    vkBindBufferMemory(Global::device, vertexBuffer, vertexBufferMemory, 0);
+
+    void* data;
+    vkMapMemory(Global::device, vertexBufferMemory, 0, bufferInfo.size, 0, &data);
+    memcpy(data, vertices.data(), (size_t) bufferInfo.size);
+    vkUnmapMemory(Global::device, vertexBufferMemory);
+  }
+  void bufferslibrary::destroyVertexBuffer() {
+    vkDestroyBuffer(Global::device, vertexBuffer, nullptr);
+    vkFreeMemory(Global::device, vertexBufferMemory, nullptr);
+  }
+  VkBuffer bufferslibrary::getVertexBuffer() {
+    return vertexBuffer;
+  }
+  std::vector<Global::Vertex> bufferslibrary::getVertices() {
+    return vertices;
+  }
+}

src/graphics/buffers.h

@@ -0,0 +1,12 @@
+#pragma once
+#include "../global.h"
+
+namespace Buffers {
+  class bufferslibrary {
+    public:
+      void createVertexBuffer();
+      void destroyVertexBuffer();
+      VkBuffer getVertexBuffer();
+      std::vector<Global::Vertex> getVertices();
+  };
+}

src/graphics/graphicspipeline.cpp

@@ -1,5 +1,7 @@
 
 #include "graphicspipeline.h"
+#include "buffers.h"
+#include <vector>
 namespace Graphics {
   std::vector<VkDynamicState> dynamicStates = {
     VK_DYNAMIC_STATE_VIEWPORT,
@@ -11,6 +13,7 @@ namespace Graphics {
   VkPipelineLayout pipelineLayout;
   VkPipeline graphicsPipeline;
   DeviceControl::devicelibrary deviceLibs;
+  Buffers::bufferslibrary buffers;
   
   std::vector<VkFramebuffer> swapChainFramebuffers;
 
@@ -75,10 +78,14 @@ namespace Graphics {
     vertShaderStageInfo.pName = "main";
     VkPipelineVertexInputStateCreateInfo vertexInputInfo{};
     vertexInputInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;
-    vertexInputInfo.vertexBindingDescriptionCount = 0;
-    vertexInputInfo.pVertexBindingDescriptions = nullptr;
-    vertexInputInfo.vertexAttributeDescriptionCount = 0;
-    vertexInputInfo.pVertexAttributeDescriptions = nullptr; 
+
+    auto bindingDescription = Global::Vertex::getBindingDescription();
+    auto attributeDescriptions = Global::Vertex::getAttributeDescriptions();
+
+    vertexInputInfo.vertexBindingDescriptionCount = 1;
+    vertexInputInfo.pVertexBindingDescriptions = &bindingDescription;
+    vertexInputInfo.vertexAttributeDescriptionCount = static_cast<uint32_t>(attributeDescriptions.size());
+    vertexInputInfo.pVertexAttributeDescriptions = attributeDescriptions.data(); 
 
     // ------------------- STAGE 5 - RASTERIZATION ----------------- //
     // Take Vertex shader vertices and fragmentize them for the frament shader. The rasterizer also can perform depth testing, face culling, and scissor testing.
@@ -265,8 +272,6 @@ namespace Graphics {
   void graphicspipeline::recordCommandBuffer(VkCommandBuffer commandBuffer, uint32_t imageIndex) {
     VkCommandBufferBeginInfo beginInfo{};
     beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
-    beginInfo.flags = 0; // Optional
-    beginInfo.pInheritanceInfo = nullptr; // Optional
 
     if (vkBeginCommandBuffer(commandBuffer, &beginInfo) != VK_SUCCESS) {
       throw std::runtime_error("failed to begin recording command buffer!");
@@ -286,7 +291,6 @@ namespace Graphics {
     vkCmdBeginRenderPass(commandBuffer, &renderPassInfo, VK_SUBPASS_CONTENTS_INLINE);
 
     vkCmdBindPipeline(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, graphicsPipeline);
-
     VkViewport viewport{};
     viewport.x = 0.0f;
     viewport.y = 0.0f;
@@ -299,10 +303,13 @@ namespace Graphics {
     VkRect2D scissor{};
     scissor.offset = {0, 0};
     scissor.extent = deviceLibs.getSwapChainExtent();
-    vkCmdSetScissor(commandBuffer, 0, 1, &scissor);            
+    vkCmdSetScissor(commandBuffer, 0, 1, &scissor); 
 
-    vkCmdDraw(commandBuffer, 3, 1, 0, 0);
+    VkBuffer vertexBuffers[] = {buffers.getVertexBuffer()};
+    VkDeviceSize offsets[] = {0};
+    vkCmdBindVertexBuffers(commandBuffer, 0, 1, vertexBuffers, offsets);
 
+    vkCmdDraw(commandBuffer, static_cast<uint32_t>(buffers.getVertices().size()), 1, 0, 0);
     vkCmdEndRenderPass(commandBuffer);
 
     if (vkEndCommandBuffer(commandBuffer) != VK_SUCCESS) {

src/graphics/graphicspipeline.h

@@ -1,6 +1,7 @@
 #pragma once
 #include "../global.h"
 #include "../devicelibrary.h"
+#include "buffers.h"
 #include <fstream>
 namespace Graphics {
   class graphicspipeline {

src/shaders/vertex.vert

@@ -1,20 +1,12 @@
 #version 450
+// inPosition and inColor are vertex attributes, per-vertex properties defined in the vertex buffer!
+// Layout assigns indices to access these inputs, dvec3 takes 2 slots so we must index it at 2. https://www.khronos.org/opengl/wiki/Layout_Qualifier_(GLSL)
+layout(location = 0) in vec2 inPosition;
+layout(location = 1) in vec3 inColor;
 
 layout(location = 0) out vec3 fragColor;
 
-vec2 positions[3] = vec2[](
-    vec2(0.0, -0.5),
-    vec2(0.5, 0.5),
-    vec2(-0.5, 0.5)
-);
-
-vec3 colors[3] = vec3[](
-    vec3(1.0, 0.0, 0.0),
-    vec3(0.0, 1.0, 0.0),
-    vec3(0.0, 0.0, 1.0)
-);
-
 void main() {
-    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
-    fragColor = colors[gl_VertexIndex];
+    gl_Position = vec4(inPosition, 0.0, 1.0);
+    fragColor = inColor;
 }