feat(renderer): Basic command list managemnent

src/renderer/backend_api.h

@@ -6,16 +6,19 @@
 
 #include "renderer.h"
 #include "render_resource.h"
+#include "command_list.h"
 
 typedef struct rt_physical_resource_manager_i rt_physical_resource_manager_i;
 
 typedef rt_physical_resource_manager_i rt_render_device_get_physical_resource_manager_fn(void *o);
+typedef rt_result rt_render_device_submit_command_list_fn(void *o, rt_render_command_list *list);
 
 /* Interface for the render device.
  * The device is responsible for executing command lists. */
 typedef struct {
     void *o;
     rt_render_device_get_physical_resource_manager_fn *GetPhysicalResourceManager;
+    rt_render_device_submit_command_list_fn *SubmitCommandList;
 } rt_render_device_i;
 
 typedef bool rt_physical_resource_manager_is_present_fn(void *o, rt_render_resource_handle h);
@@ -51,5 +54,6 @@ typedef struct {
 } rt_render_backend_api;
 
 extern rt_render_backend_api g_render_backend;
+extern rt_render_device_i g_device_i;
 
 #endif

src/renderer/command_list.c

@@ -0,0 +1,103 @@
+#include "command_list.h"
+#include "backend_api.h"
+
+#include <runtime/config.h>
+#include <runtime/mem_arena.h>
+#include <runtime/threading.h>
+#include <string.h>
+
+RT_CVAR_SZ(r_PerFrameCommandListMemory, "Amount of memory to allocate for single frame command list management."
+    " The total amount of memory will be this times the maximum number of frames in flight. (Default: 16 MB)",
+    RT_MB(16));
+
+static rt_arena _list_arenas[3];
+static rt_arena *_current_arena = &_list_arenas[0];
+static unsigned int _current_arena_idx = 0;
+static rt_mutex *_mutex;
+
+rt_result InitCommandLists(void) {
+    _mutex = rtCreateMutex();
+    if (!_mutex)
+        return RT_UNKNOWN_ERROR;
+
+    for (unsigned int i = 0; i < RT_ARRAY_COUNT(_list_arenas); ++i) {
+        rt_create_arena_result arena_res = rtCreateArena(NULL, r_PerFrameCommandListMemory.sz);
+        if (!arena_res.ok) {
+            rtDestroyMutex(_mutex);
+            return RT_OUT_OF_MEMORY;
+        }
+        _list_arenas[i] = arena_res.arena;
+    }
+    return RT_SUCCESS;
+}
+
+void ShutdownCommandLists(void) {
+    for (unsigned int i = 0; i < RT_ARRAY_COUNT(_list_arenas); ++i) {
+        rtReleaseArena(&_list_arenas[i]);
+    }
+    rtDestroyMutex(_mutex);
+}
+
+void CommandListsOnBeginFrame(void) {
+    _current_arena_idx = (_current_arena_idx + 1) % RT_ARRAY_COUNT(_list_arenas);
+    _current_arena = &_list_arenas[_current_arena_idx];
+    rtArenaClear(_current_arena);
+}
+
+#define COMMAND_LIST_CAPACITY RT_KB(512)
+#define AVERAGE_COMMAND_DATA_SIZE sizeof(rt_draw_indirect_data)
+#define COMMAND_LIST_MAX_LENGTH (COMMAND_LIST_CAPACITY / AVERAGE_COMMAND_DATA_SIZE)
+
+/* Get a new render command list. */
+RT_DLLEXPORT rt_begin_render_command_list_result rtBeginRenderCommandList(void) {
+    size_t mem_required = COMMAND_LIST_MAX_LENGTH * sizeof(rt_render_command_header) + COMMAND_LIST_CAPACITY;
+    rtLockMutex(_mutex);
+    void *mem = rtArenaPush(_current_arena, mem_required);
+    rtUnlockMutex(_mutex);
+    if (!mem) {
+        rtReportError("RENDERER", "Ran out of memory for command lists.");
+        return (rt_begin_render_command_list_result){.result = RT_OUT_OF_MEMORY};
+    }
+    rt_render_command_list list = {
+        .headers = mem,
+        .data = (void *)((rt_render_command_header *)mem + COMMAND_LIST_MAX_LENGTH),
+        .length = 0u,
+        .data_capacity =  COMMAND_LIST_CAPACITY,
+        .data_end = 0u
+    };
+    return (rt_begin_render_command_list_result){
+        .result = RT_SUCCESS,
+        .list = list
+    };
+}
+
+/* Lowlevel function that writes the data to the queue. */
+RT_DLLEXPORT rt_result rtEncodeRenderCommand(rt_render_command_list *list, rt_render_command_type type, rt_render_queue queue, const void *data) {
+    size_t data_size = 0u;
+    switch (type) {
+    case RT_RENDER_COMMAND_DRAW_INDIRECT:
+        data_size = sizeof(rt_draw_indirect_data);
+        break;
+    default:
+        rtReportError("RENDERER", "Invalid render command type %u", type);
+        return RT_INVALID_VALUE;
+    }
+
+    if (list->length == COMMAND_LIST_MAX_LENGTH || (list->data_end + data_size) > list->data_capacity) {
+        rtReportError("RENDERER", "Reached maximum lenght or capacity of command list.");
+        return RT_OUT_OF_MEMORY;
+    }
+
+    list->headers[list->length].type = type;
+    list->headers[list->length].target_queue = queue;
+    ++list->length;
+    char *dest = (char *)list->data + list->data_end;
+    memcpy(dest, data, data_size);
+    list->data_end += data_size;
+    return RT_SUCCESS;
+}
+
+/* Submit a finished command list to the graphics device. The list will not be usable after this function is done. */
+RT_DLLEXPORT rt_result rtSubmitCommandList(rt_render_command_list *list) {
+    return g_device_i.SubmitCommandList(g_device_i.o, list);
+}

src/renderer/command_list.h

@@ -0,0 +1,81 @@
+#ifndef RT_RENDERER_COMMAND_LIST_H
+#define RT_RENDERER_COMMAND_LIST_H
+
+#include <stdint.h>
+#include <runtime/runtime.h>
+#include "render_resource.h"
+
+/* Types of render commands */
+typedef enum {
+    RT_RENDER_COMMAND_DRAW_INDIRECT,
+} rt_render_command_type;
+
+typedef enum {
+    RT_RENDER_QUEUE_GRAPHICS,
+    RT_RENDER_QUEUE_COMPUTE,
+    RT_RENDER_QUEUE_TRANSFER,
+} rt_render_queue;
+
+/* Structures containing command parameters */
+
+typedef struct {
+    rt_render_buffer_handle buffer;
+    uint32_t offset;
+    uint32_t draw_count;
+    uint32_t stride;
+} rt_draw_indirect_data;
+
+typedef struct {
+    uint32_t type;
+    uint32_t target_queue;
+} rt_render_command_header;
+
+typedef struct {
+    rt_render_command_header *headers;
+    void *data;
+    /* Number of encoded commands */
+    uint32_t length;
+
+    /* Information used while encoding.
+     * In the future, it would be possible to move this to another struct that is discarded after
+     * encoding is finished.
+     */
+
+    size_t data_capacity;
+    size_t data_end;
+} rt_render_command_list;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* *** Encoding API *** */
+
+typedef struct {
+    rt_result result;
+    rt_render_command_list list;
+} rt_begin_render_command_list_result;
+
+/* Get a new render command list. */
+RT_DLLEXPORT rt_begin_render_command_list_result rtBeginRenderCommandList(void);
+
+/* Lowlevel function that writes the data to the queue. */
+RT_DLLEXPORT rt_result rtEncodeRenderCommand(rt_render_command_list *list, rt_render_command_type type, rt_render_queue queue, const void *data);
+
+/* Helper functions for specific commands */
+RT_INLINE rt_result rtEncodeDrawIndirect(rt_render_command_list *list, const rt_draw_indirect_data *draw_indirect_data) {
+    return rtEncodeRenderCommand(list, RT_RENDER_COMMAND_DRAW_INDIRECT, RT_RENDER_QUEUE_GRAPHICS, draw_indirect_data);
+}
+
+/* *** Submission *** */
+
+/* Submit a finished command list to the graphics device. The list will not be usable after this function is done. */
+RT_DLLEXPORT rt_result rtSubmitCommandList(rt_render_command_list *list);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif

src/renderer/init.c

@@ -5,9 +5,11 @@
 #include <runtime/config.h>
 
 extern rt_cvar r_MaxRenderResources;
+extern rt_cvar r_PerFrameCommandListMemory;
 
 RT_DLLEXPORT void rtRegisterRenderCVARs(void) {
     rtRegisterCVAR(&r_MaxRenderResources);
+    rtRegisterCVAR(&r_PerFrameCommandListMemory);
 }
 
 RT_DLLEXPORT void rtRegisterRenderBackendCVARs(void) {
@@ -18,6 +20,8 @@ rt_render_device_i g_device_i;
 
 extern rt_result InitVirtualResourceRegistry(void);
 extern void ShutdownVirtualResourceRegistry(void);
+extern rt_result InitCommandLists(void);
+extern void ShutdownCommandLists(void);
 
 RT_DLLEXPORT rt_result rtInitRenderer(const rt_renderer_window_info *info) {
     rt_render_backend_init_result backend_res = g_render_backend.Init(info);
@@ -30,9 +34,16 @@ RT_DLLEXPORT rt_result rtInitRenderer(const rt_renderer_window_info *info) {
         g_render_backend.Shutdown();
         return res;
     }
+    if ((res = InitCommandLists()) != RT_SUCCESS) {
+        ShutdownVirtualResourceRegistry();
+        g_render_backend.Shutdown();
+        return res;
+    }
     return res;
 }
 
 RT_DLLEXPORT void rtShutdownRenderer(void) {
+    ShutdownCommandLists();
+    ShutdownVirtualResourceRegistry();
     g_render_backend.Shutdown();
 }

src/renderer/meson.build

@@ -17,11 +17,13 @@ endif
 
 renderer_lib = library('renderer',
     'backend_api.h',
+    'command_list.h',
     'renderer.h',
     'render_mesh.h',
     'render_resource.h',
     'virtual_resource_registry.h',
 
+    'command_list.c',
     'init.c',
     'load_stub.c',
     'meshlet_pools.c',

src/renderer/render_resource.h

@@ -21,6 +21,11 @@ typedef struct {
     uint32_t value;
 } rt_render_resource_handle;
 
+/* Aliases for render_resource_handle to be able to express the type of expected resources in code. */
+
+typedef rt_render_resource_handle rt_render_buffer_handle;
+typedef rt_render_resource_handle rt_render_texture2d_handle;
+
 #define RT_RENDER_RESOURCE_MAX_VERSION 0x3f
 
 /* Extract the type part of a render resource handle */
@@ -84,6 +89,20 @@ typedef struct {
     rt_resource_id source_resource;
 } rt_render_buffer_desc;
 
+typedef enum {
+    RT_TEXTURE_FORMAT_B8G8R8A8_SRGB,
+
+    RT_TEXTURE_FORMAT_MAX,
+} rt_texture_format;
+
+typedef enum {
+    RT_TEXTURE_USAGE_NONE                     = 0x00,
+    RT_TEXTURE_USAGE_COLOR_ATTACHMENT         = 0x01,
+    RT_TEXTURE_USAGE_DEPTH_STENCIL_ATTACHMENT = 0x02,
+    RT_TEXTURE_USAGE_SAMPLED_IMAGE            = 0x04,
+    RT_TEXTURE_USAGE_STORAGE_IMAGE            = 0x10,
+} rt_texture_usage_flags;
+
 /* Describes a gpu texture */
 typedef struct {
     /* Width in pixels */
@@ -91,6 +110,21 @@ typedef struct {
 
     /* Height in pixels */
     uint32_t height;
+
+    /* Pixel format */
+    rt_texture_format format;
+
+    /* Number of samples */
+    uint32_t samples;
+
+    /* Number of mip levels */
+    uint32_t mip_levels;
+
+    /* Bitmask of usages this texture needs to support */
+    rt_texture_usage_flags usage;
+
+    /* ResourceID of the resource that will be used to populate this texture. */
+    rt_resource_id source_resource;
 } rt_render_texture2d_desc;
 
 #endif

src/renderer/vk/device.c

@@ -655,4 +655,27 @@ rt_physical_resource_manager_i rtVkDevGetPhysicalResourceManager(void *o) {
         .CreateTexture2D = rtVkPhysicalResourceManagerCreateTexture2D,
     };
     return iface;
+}
+
+rt_result rtVkDevSubmitCommandList(void *o, rt_render_command_list *list) {
+    /* Dummy implementation */
+    RT_UNUSED(o);
+
+    size_t data_off = 0;
+    for (uint32_t i = 0; i < list->length; ++i) {
+        if (list->headers[i].type != RT_RENDER_COMMAND_DRAW_INDIRECT)
+            break;
+        rtLog("VK", "DrawIndirect %u", i);
+        rtLog("VK", "Target queue: %u", list->headers[i].target_queue);
+
+        RT_VERIFY(data_off < list->data_end);
+        rt_draw_indirect_data *data = (rt_draw_indirect_data *)((char *)list->data + data_off);
+        rtLog("VK", "buffer %u draw_count %u offset %u stride %u",
+            data->buffer.value,
+            data->draw_count,
+            data->offset,
+            data->stride);
+        data_off += sizeof(rt_draw_indirect_data);
+    }
+    return RT_SUCCESS;
 }

src/renderer/vk/device.h

@@ -89,5 +89,6 @@ void rtDestroyVkDevice(rt_vk_device *dev);
 
 /* rt_render_device_i functions */
 rt_physical_resource_manager_i rtVkDevGetPhysicalResourceManager(void *o);
+rt_result rtVkDevSubmitCommandList(void *o, rt_render_command_list *list);
 
 #endif

src/renderer/vk/init.c

@@ -37,6 +37,7 @@ rt_render_backend_init_result VkInit(const rt_renderer_window_info *info) {
     rt_render_device_i device_i = {
         .o =  &_device,
         .GetPhysicalResourceManager = rtVkDevGetPhysicalResourceManager,
+        .SubmitCommandList = rtVkDevSubmitCommandList,
     };
     res.device = device_i;
 

src/renderer/vk/physical_resource_manager.c

@@ -147,6 +147,19 @@ void rtVkPhysicalResourceManagerDestroy(void *o, rt_render_resource_handle handl
     rtUnlockWrite(&phys_res_mgr->lock);
 }
 
+/* Call this with a held write lock! */
+static uint32_t AllocStorageSlot(rt_vk_physical_resource_manager *phys_res_mgr, rt_render_resource_handle h) {
+    if (phys_res_mgr->free_slot_count > 0u) {
+        uint32_t slot = phys_res_mgr->free_slots[--phys_res_mgr->free_slot_count];
+        /* The hashtable is large enough that this should never fail */
+        rt_result insert_res = rtHashtableInsert(&phys_res_mgr->resource_lut, (uint64_t)h.value, (uint64_t)slot);
+        RT_UNUSED(insert_res);
+        RT_VERIFY(insert_res == RT_SUCCESS);
+        return slot;
+    }
+    return UINT32_MAX;
+}
+
 rt_result rtVkPhysicalResourceManagerCreateBuffer(void *o, rt_render_resource_handle h, const rt_render_buffer_desc *desc) {
     rt_vk_physical_resource_manager *phys_res_mgr = o;
 
@@ -190,28 +203,89 @@ rt_result rtVkPhysicalResourceManagerCreateBuffer(void *o, rt_render_resource_ha
     /* Store */
     rt_result res = RT_SUCCESS;
     rtLockWrite(&phys_res_mgr->lock);
-    if (phys_res_mgr->free_slot_count > 0u) {
-        uint32_t slot = phys_res_mgr->free_slots[--phys_res_mgr->free_slot_count];
+    uint32_t slot = AllocStorageSlot(phys_res_mgr, h);
+    if (slot != UINT32_MAX) {
         phys_res_mgr->resources[slot].type = RT_RENDER_RESOURCE_TYPE_BUFFER;
         phys_res_mgr->resources[slot].buffer = buffer;
         phys_res_mgr->resources[slot].allocation = allocation;
-
-        /* The hashtable is large enough that this should never fail */
-        rt_result insert_res = rtHashtableInsert(&phys_res_mgr->resource_lut, (uint64_t)h.value, (uint64_t)slot);
-        RT_UNUSED(insert_res);
-        RT_VERIFY(insert_res == RT_SUCCESS);
-    }
-    else {
-        rtLog("VK", "Could not create buffer, because no free slots for storing it are available.");
-        vmaDestroyBuffer(phys_res_mgr->allocator, buffer, allocation);
+    } else {
         res = RT_OUT_OF_MEMORY;
+        vmaDestroyBuffer(phys_res_mgr->allocator, buffer, allocation);
+        rtLog("VK","Could not create buffer because no storage space is available.");
     }
     rtUnlockWrite(&phys_res_mgr->lock);
 
     return res;
 }
 
+static VkFormat RtTextureFormatToVkFormat(rt_texture_format texture_format) {
+    RT_ASSERT(texture_format < RT_TEXTURE_FORMAT_MAX, "Invalid format");
+    VkFormat formats[RT_TEXTURE_FORMAT_MAX] = {
+        VK_FORMAT_B8G8R8A8_SRGB, // RT_TEXTURE_FORMAT_B8G8R8A8_SRGB
+    };
+    return formats[texture_format];
+}
+
+static VkImageUsageFlagBits RtTextureUsageToVkImageUsage(rt_texture_usage_flags usage_flags) {
+    VkImageUsageFlagBits usage = 0;
+    if ((usage_flags & RT_TEXTURE_USAGE_COLOR_ATTACHMENT) != 0)
+        usage |= VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
+    if ((usage_flags & RT_TEXTURE_USAGE_DEPTH_STENCIL_ATTACHMENT) != 0)
+        usage |= VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT;
+    if ((usage_flags & RT_TEXTURE_USAGE_SAMPLED_IMAGE) != 0)
+        usage |= VK_IMAGE_USAGE_SAMPLED_BIT;
+    if ((usage_flags & RT_TEXTURE_USAGE_STORAGE_IMAGE) != 0)
+        usage |= VK_IMAGE_USAGE_STORAGE_BIT;
+    return usage;
+}
+
 rt_result rtVkPhysicalResourceManagerCreateTexture2D(void *o, rt_render_resource_handle h, const rt_render_texture2d_desc *desc) {
-    RT_NOT_IMPLEMENTED;
-    return RT_UNKNOWN_ERROR;
+    rt_vk_physical_resource_manager *phys_res_mgr = o;
+
+    VkFormat format = RtTextureFormatToVkFormat(desc->format);
+    VkExtent3D extent = {.width = desc->width, .height = desc->height, .depth = 1};
+    VkImageUsageFlagBits usage = RtTextureUsageToVkImageUsage(desc->usage);
+
+    VkImageCreateInfo image_info = {
+        .sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,
+        .extent = extent,
+        .format = format,
+        .imageType = VK_IMAGE_TYPE_2D,
+        .sharingMode = VK_SHARING_MODE_CONCURRENT,
+        .queueFamilyIndexCount = phys_res_mgr->dev->unique_family_count,
+        .pQueueFamilyIndices = &phys_res_mgr->dev->unique_families[0],
+        .mipLevels = 1,
+        .samples = VK_SAMPLE_COUNT_1_BIT,
+        .arrayLayers = 1,
+        .initialLayout = VK_IMAGE_LAYOUT_UNDEFINED,
+        .usage = usage,
+        .tiling = VK_IMAGE_TILING_OPTIMAL,
+    };
+
+    VmaAllocationCreateInfo alloc_info = {
+        .usage = VMA_MEMORY_USAGE_AUTO,
+    };
+
+    VkImage image;
+    VmaAllocation allocation;
+    if (vmaCreateImage(phys_res_mgr->allocator, &image_info, &alloc_info, &image, &allocation, NULL) != VK_SUCCESS) {
+        rtLog("VK", "Failed to create image.");
+        return RT_UNKNOWN_ERROR;
+    }
+    /* Store */
+    rt_result res = RT_SUCCESS;
+    rtLockWrite(&phys_res_mgr->lock);
+    uint32_t slot = AllocStorageSlot(phys_res_mgr, h);
+    if (slot != UINT32_MAX) {
+        phys_res_mgr->resources[slot].type = RT_RENDER_RESOURCE_TYPE_BUFFER;
+        phys_res_mgr->resources[slot].image = image;
+        phys_res_mgr->resources[slot].allocation = allocation;
+    } else {
+        res = RT_OUT_OF_MEMORY;
+        vmaDestroyImage(phys_res_mgr->allocator, image, allocation);
+        rtLog("VK","Could not create image because no storage space is available.");
+    }
+    rtUnlockWrite(&phys_res_mgr->lock);
+
+    return res;
 }