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#include <glfw3.h>
#include <stdlib.h>
#include <vulkan/vk_platform.h>
#include <vulkan/vulkan.h>
#include <vulkan/vulkan_core.h>
#include "backend_vulkan.h"
#include "mem.h"
#include "vulkan_helpers.h"
#include "defines.h"
#include "log.h"
#include "ral.h"
#include "ral_types.h"
// TEMP
#define SCREEN_WIDTH 1000
#define SCREEN_HEIGHT 1000
#define VULKAN_QUEUES_COUNT 2
const char* queue_names[VULKAN_QUEUES_COUNT] = { "GRAPHICS", "TRANSFER" };
typedef struct vulkan_context {
VkInstance instance;
VkAllocationCallbacks* allocator;
VkSurfaceKHR surface;
arena temp_arena;
gpu_device* device;
gpu_swapchain* swapchain;
u32 screen_width;
u32 screen_height;
} vulkan_context;
static vulkan_context context;
// --- Function forward declarations
/** @brief Enumerates and selects the most appropriate graphics device */
bool select_physical_device(gpu_device* out_device);
/** @brief Helper function for creating array of all extensions we want */
cstr_darray* get_all_extensions();
bool gpu_backend_init(const char* window_name, GLFWwindow* window) {
context.allocator = 0; // TODO: use an allocator
context.screen_width = SCREEN_WIDTH;
context.screen_height = SCREEN_HEIGHT;
// Create an allocator
size_t temp_arena_size = 1024 * 1024;
arena_create(malloc(temp_arena_size), temp_arena_size);
// Setup Vulkan instance
VkApplicationInfo app_info = { VK_STRUCTURE_TYPE_APPLICATION_INFO };
app_info.apiVersion = VK_API_VERSION_1_3;
app_info.pApplicationName = window_name;
app_info.applicationVersion = VK_MAKE_VERSION(1, 0, 0);
app_info.pEngineName = "Celeritas Engine";
app_info.engineVersion = VK_MAKE_VERSION(1, 0, 0);
VkInstanceCreateInfo create_info = { VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO };
create_info.pApplicationInfo = &app_info;
// Extensions
// FIXME: Use my own extension choices
// cstr_darray* required_extensions = cstr_darray_new(2);
// cstr_darray_push(required_extensions, VK_KHR_SURFACE_EXTENSION_NAME);
// create_info.enabledExtensionCount = cstr_darray_len(required_extensions);
// create_info.ppEnabledExtensionNames = required_extensions->data;
uint32_t count;
const char** extensions = glfwGetRequiredInstanceExtensions(&count);
create_info.enabledExtensionCount = count;
create_info.ppEnabledExtensionNames = extensions;
// TODO: Validation layers
create_info.enabledLayerCount = 0;
create_info.ppEnabledLayerNames = NULL;
VkResult result = vkCreateInstance(&create_info, NULL, &context.instance);
if (result != VK_SUCCESS) {
ERROR("vkCreateInstance failed with result: %u", result);
return false;
}
TRACE("Vulkan Instance created");
// Surface creation
VkSurfaceKHR surface;
VK_CHECK(glfwCreateWindowSurface(context.instance, window, NULL, &surface));
context.surface = surface;
TRACE("Vulkan Surface created");
return true;
}
void gpu_backend_shutdown() { arena_free_storage(&context.temp_arena); }
bool gpu_device_create(gpu_device* out_device) {
// Physical device
if (!select_physical_device(out_device)) {
return false;
}
TRACE("Physical device selected");
// Features
VkPhysicalDeviceFeatures device_features = { 0 };
device_features.samplerAnisotropy = VK_TRUE; // request anistrophy
// Logical device
VkDeviceQueueCreateInfo queue_create_info[2];
//..
VkDeviceCreateInfo device_create_info = { VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO };
device_create_info.queueCreateInfoCount = VULKAN_QUEUES_COUNT;
device_create_info.pQueueCreateInfos = queue_create_info;
device_create_info.pEnabledFeatures = &device_features;
device_create_info.enabledExtensionCount = 1;
const char* extension_names = VK_KHR_SWAPCHAIN_EXTENSION_NAME;
device_create_info.ppEnabledExtensionNames = &extension_names;
VkResult result = vkCreateDevice(out_device->physical_device, &device_create_info,
context.allocator, &out_device->logical_device);
if (result != VK_SUCCESS) {
FATAL("Error creating logical device with status %u\n", result);
exit(1);
}
TRACE("Logical device created");
// Queues
// Create the command pool
return true;
}
bool gpu_swapchain_create(gpu_swapchain* out_swapchain) {
VkExtent2D swapchain_extent = { context.screen_width, context.screen_height };
// find a format
VkPresentModeKHR present_mode = VK_PRESENT_MODE_FIFO_KHR; // guaranteed to be implemented
VkSwapchainCreateInfoKHR swapchain_create_info = { VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR };
// swapchain_create_info.minImageCount =
VK_CHECK(vkCreateSwapchainKHR(context.device->logical_device, &swapchain_create_info,
context.allocator, &out_swapchain->handle));
TRACE("Vulkan Swapchain created");
}
gpu_pipeline* gpu_graphics_pipeline_create(struct graphics_pipeline_desc description) {
VkViewport viewport = { .x = 0,
.y = 0,
.width = (f32)context.screen_width,
.height = (f32)context.screen_height,
.minDepth = 0.0,
.maxDepth = 1.0 };
VkRect2D scissor = { .offset = { .x = 0, .y = 0 },
.extent = { .width = context.screen_width,
.height = context.screen_height } };
// TODO: Attributes
// TODO: layouts
VkPipelineViewportStateCreateInfo viewport_state = {
VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO
};
viewport_state.viewportCount = 1;
viewport_state.pViewports = &viewport;
viewport_state.scissorCount = 1;
viewport_state.pScissors = &scissor;
}
gpu_renderpass* gpu_renderpass_create() {
// Allocate it
// sets everything up
// return pointer to it
}
void encode_set_pipeline(gpu_cmd_encoder* encoder, gpu_pipeline* pipeline) {
// VK_PIPELINE_BIND_POINT_GRAPHICS, &shader->pipeline);
// if (kind == PIPELINE_GRAPHICS) {
// // ...
// } else {
// // ...
// }
}
// --- Drawing
inline void encode_draw_indexed(gpu_cmd_encoder* encoder, u64 index_count) {
vkCmdDrawIndexed(encoder->cmd_buffer, index_count, 1, 0, 0, 0);
}
bool select_physical_device(gpu_device* out_device) {}
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