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Alessandro Mauri 5 months ago
parent ee79b4c195
commit ef9161fabe
Signed by: alema
GPG Key ID: 2B7BF9531FF03BE8
3 changed files with 77 additions and 35 deletions
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  1. 2
      .clang-format
  2. 27
      test3/README
  3. 83
      test3/main.c

2
.clang-format
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@ -1,7 +1,7 @@
# linux kernel style formatting
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: Always
UseTab: AlignWithSpaces
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false

27
test3/README
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@ -1 +1,26 @@
Trying to implement test2 with just vulkan and in C
### Trying to implement test2 with just vulkan and in C
Just trying to get large matrix multiplication going in C since C++ really fucks with
my grey matter
### Useful links:
[Vulkan Tutorial](https://vulkan-tutorial.com): A full Vulkan tutorial implemented in C++
but it is easy to port to C, the only brain scratcher are lifetimes. Still this is more
targeted towards graphics rather than Compute, as such it is not easy to differentiate
which parts are needed and which aren't
[Simple Vulkan Compute Example](https://bakedbits.dev/posts/vulkan-compute-example/):
a bit brief, as such easier to skim trough
[A Simple Vulkan Compute Example](https://www.neilhenning.dev/posts/a-simple-vulkan-compute-example/):
This time in C, more complete than the homonymous article and still easy to follow
[VkGuide](https://vkguide.dev/docs/gpudriven/compute_shaders/): Good resource but not
really a tutorial
[Vulkan Samples](https://github.com/SaschaWillems/Vulkan-Samples): A collection of sample
programs, still haven't read trough them but might be good for implementation details
[VkFFT](https://github.com/DTolm/VkFFT): Fast Fourier Transform on vulkan shader, still
haven't looked at it but it might be great to learn more advanced shader techniques

83
test3/main.c
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@ -6,13 +6,14 @@
#include <errno.h>
#include <vulkan/vulkan.h>
#include <vulkan/vulkan_core.h>
// check for half precision floating point support, for x86 this is equivalent to
// checking for SSE2
#define SUPPORTS_NATIVE_FP16 (__x86_64__ == 1 && __SSE2__ == 1)
// print debug messages
#define DEBUG 1
#define VERBOSE 0
#define DEBUG 1
#define VERBOSE 0
// define half precision floating point
#if SUPPORTS_NATIVE_FP16
@ -97,13 +98,14 @@ VkInstance vk_init(void)
VkInstance vk_instance = VK_NULL_HANDLE;
VkApplicationInfo vk_appinfo = {
.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO,
.pNext = NULL,
.pApplicationName = __FILE__,
.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO,
.pNext = NULL,
.pApplicationName = __FILE__,
.applicationVersion = VK_MAKE_VERSION(0, 1, 0),
.pEngineName = "no engine",
.engineVersion = VK_MAKE_VERSION(0, 0, 0),
.apiVersion = VK_API_VERSION_1_3,
.pEngineName = "no engine",
.engineVersion = VK_MAKE_VERSION(0, 0, 0),
.apiVersion =
VK_API_VERSION_1_2, // api version 1.2 is more widely available
};
vk_enumerate_instance_extensions();
@ -118,12 +120,12 @@ VkInstance vk_init(void)
(uint32_t)(sizeof(vk_instance_extensions) / sizeof(char *));
VkInstanceCreateInfo vk_instanceinfo = {
.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO,
.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO,
.pApplicationInfo = &vk_appinfo,
.flags = VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR,
.flags = VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR,
.enabledExtensionCount = vk_instance_extensions_no,
.ppEnabledExtensionNames = vk_instance_extensions,
.enabledLayerCount = 0,
.enabledLayerCount = 0,
};
int e = 0;
@ -153,9 +155,10 @@ void vk_destroy(VkInstance vk_instance)
VkPhysicalDevice vk_physical_device_get(VkInstance vk_instance)
{
// get the physical devices list
VkPhysicalDevice vk_phydev = VK_NULL_HANDLE;
uint32_t vk_phydevs_no = 0;
uint32_t vk_phydevs_no = 0;
VkPhysicalDevice *vk_phydevs;
vkEnumeratePhysicalDevices(vk_instance, &vk_phydevs_no, NULL);
@ -171,24 +174,38 @@ VkPhysicalDevice vk_physical_device_get(VkInstance vk_instance)
vkEnumeratePhysicalDevices(vk_instance, &vk_phydevs_no, vk_phydevs);
// print out information about each device
printf("Available Physical Devices: \n");
for (uint32_t i = 0; i < vk_phydevs_no; i++) {
VkPhysicalDevice device = vk_phydevs[i];
VkPhysicalDeviceProperties device_properties;
VkPhysicalDeviceFeatures device_features;
VkPhysicalDevice dev = vk_phydevs[i];
VkPhysicalDeviceProperties dev_properties;
VkPhysicalDeviceFeatures dev_features;
VkPhysicalDeviceMemoryProperties dev_memory;
vkGetPhysicalDeviceProperties(device, &device_properties);
vkGetPhysicalDeviceFeatures(device, &device_features);
vkGetPhysicalDeviceProperties(dev, &dev_properties);
vkGetPhysicalDeviceFeatures(dev, &dev_features);
vkGetPhysicalDeviceMemoryProperties(dev, &dev_memory);
printf(
"\tDevice %d: %s, Discrete: %s\n",
i,
device_properties.deviceName,
device_properties.deviceType ==
VK_PHYSICAL_DEVICE_TYPE_DISCRETE_GPU
dev_properties.deviceName,
dev_properties.deviceType == VK_PHYSICAL_DEVICE_TYPE_DISCRETE_GPU
? "true"
: "false"
);
for (unsigned x = 0; x < dev_memory.memoryHeapCount; x++) {
uint64_t mem_size = dev_memory.memoryHeaps[x].size;
uint32_t mem_flags = dev_memory.memoryHeaps[x].flags;
char mem_local = mem_flags & VK_MEMORY_HEAP_DEVICE_LOCAL_BIT;
printf(
"\t\tHeap %.2d: local: %d, size: %.3f MiB\n",
x,
mem_local,
(float)mem_size / (1024.0 * 1024.0)
);
}
}
// TODO: find the most suitable physical device, but for now every vulkan
@ -210,9 +227,9 @@ void vk_physical_device_destroy(VkPhysicalDevice vk_phydev)
// returns a negative index on error
int vk_device_compute_queue_index(VkPhysicalDevice vk_phydev)
{
uint32_t vk_qfamilies_no = 0;
uint32_t vk_qfamilies_no = 0;
VkQueueFamilyProperties *vk_qfamilies;
int supports = -1;
int supports = -1;
vkGetPhysicalDeviceQueueFamilyProperties(vk_phydev, &vk_qfamilies_no, NULL);
@ -239,16 +256,16 @@ int vk_device_compute_queue_index(VkPhysicalDevice vk_phydev)
VkDevice vk_logical_device_create(VkPhysicalDevice vk_phydev, int qfamily_idx)
{
VkResult res;
VkDevice vk_logdev = VK_NULL_HANDLE;
float vk_queue_priority = 1.0f;
VkDevice vk_logdev = VK_NULL_HANDLE;
float vk_queue_priority = 1.0f;
// specify which command queues to use for the physical device
VkDeviceQueueCreateInfo vk_queueinfo = {
.sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO,
.pNext = NULL,
.flags = 0,
.sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO,
.pNext = NULL,
.flags = 0,
.queueFamilyIndex = qfamily_idx,
.queueCount = 1,
.queueCount = 1,
.pQueuePriorities = &vk_queue_priority,
};
@ -261,14 +278,14 @@ VkDevice vk_logical_device_create(VkPhysicalDevice vk_phydev, int qfamily_idx)
// FIXME: here validation layers are ignored but it is still better to define
// them for compatibility
VkDeviceCreateInfo vk_createinfo = {
.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO,
.pQueueCreateInfos = &vk_queueinfo,
.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO,
.pQueueCreateInfos = &vk_queueinfo,
.queueCreateInfoCount = 1,
.pEnabledFeatures = &vk_phydev_features,
.pEnabledFeatures = &vk_phydev_features,
.ppEnabledExtensionNames = NULL,
.enabledExtensionCount = 0,
.ppEnabledLayerNames = NULL,
.enabledLayerCount = 0,
.enabledLayerCount = 0,
};
res = vkCreateDevice(vk_phydev, &vk_createinfo, NULL, &vk_logdev);
@ -313,7 +330,7 @@ int main(void)
exit(EXIT_FAILURE);
}
VkPhysicalDevice vk_phydev = vk_physical_device_get(vk_instance);
int qfamily_idx = vk_device_compute_queue_index(vk_phydev);
int qfamily_idx = vk_device_compute_queue_index(vk_phydev);
if (qfamily_idx < 0) {
err("The device does not support compute queues\n");
exit(EXIT_FAILURE);

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