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package pipeline
import gpu "../core"
import "core:log"
import vk "vendor:vulkan"
Descriptor_State :: struct {
set_layout: vk.DescriptorSetLayout,
pool: vk.DescriptorPool,
}
create_descriptor_set_layout :: proc(
dev: ^gpu.Gpu_Device,
) -> (
layout: vk.DescriptorSetLayout,
ok: bool,
) {
binding := vk.DescriptorSetLayoutBinding {
binding = 0,
descriptorType = .COMBINED_IMAGE_SAMPLER,
descriptorCount = 1,
stageFlags = {.FRAGMENT},
}
create_info := vk.DescriptorSetLayoutCreateInfo {
sType = .DESCRIPTOR_SET_LAYOUT_CREATE_INFO,
bindingCount = 1,
pBindings = &binding,
}
result := vk.CreateDescriptorSetLayout(dev.device, &create_info, nil, &layout)
if result != .SUCCESS {
log.errorf("gpu/pipeline: vkCreateDescriptorSetLayout failed: %v", result)
return {}, false
}
return layout, true
}
create_descriptor_pool :: proc(
dev: ^gpu.Gpu_Device,
max_sets: u32,
) -> (
pool: vk.DescriptorPool,
ok: bool,
) {
pool_size := vk.DescriptorPoolSize {
type = .COMBINED_IMAGE_SAMPLER,
descriptorCount = max_sets,
}
create_info := vk.DescriptorPoolCreateInfo {
sType = .DESCRIPTOR_POOL_CREATE_INFO,
flags = {.FREE_DESCRIPTOR_SET},
maxSets = max_sets,
poolSizeCount = 1,
pPoolSizes = &pool_size,
}
result := vk.CreateDescriptorPool(dev.device, &create_info, nil, &pool)
if result != .SUCCESS {
log.errorf("gpu/pipeline: vkCreateDescriptorPool failed: %v", result)
return {}, false
}
return pool, true
}
allocate_descriptor_set :: proc(
dev: ^gpu.Gpu_Device,
pool: vk.DescriptorPool,
layout: vk.DescriptorSetLayout,
) -> (
set: vk.DescriptorSet,
ok: bool,
) {
layout_copy := layout
alloc_info := vk.DescriptorSetAllocateInfo {
sType = .DESCRIPTOR_SET_ALLOCATE_INFO,
descriptorPool = pool,
descriptorSetCount = 1,
pSetLayouts = &layout_copy,
}
result := vk.AllocateDescriptorSets(dev.device, &alloc_info, &set)
if result != .SUCCESS {
log.errorf("gpu/pipeline: vkAllocateDescriptorSets failed: %v", result)
return {}, false
}
return set, true
}
update_descriptor_set_image :: proc(
dev: ^gpu.Gpu_Device,
set: vk.DescriptorSet,
image_view: vk.ImageView,
sampler: vk.Sampler,
image_layout: vk.ImageLayout = .SHADER_READ_ONLY_OPTIMAL,
) {
image_info := vk.DescriptorImageInfo {
sampler = sampler,
imageView = image_view,
imageLayout = image_layout,
}
write := vk.WriteDescriptorSet {
sType = .WRITE_DESCRIPTOR_SET,
dstSet = set,
dstBinding = 0,
dstArrayElement = 0,
descriptorCount = 1,
descriptorType = .COMBINED_IMAGE_SAMPLER,
pImageInfo = &image_info,
}
vk.UpdateDescriptorSets(dev.device, 1, &write, 0, nil)
}
// Create a descriptor set layout for a uniform buffer (e.g. light UBO)
create_ubo_descriptor_set_layout :: proc(
dev: ^gpu.Gpu_Device,
stage_flags: vk.ShaderStageFlags = {.VERTEX, .FRAGMENT},
) -> (
layout: vk.DescriptorSetLayout,
ok: bool,
) {
binding := vk.DescriptorSetLayoutBinding {
binding = 0,
descriptorType = .UNIFORM_BUFFER,
descriptorCount = 1,
stageFlags = stage_flags,
}
create_info := vk.DescriptorSetLayoutCreateInfo {
sType = .DESCRIPTOR_SET_LAYOUT_CREATE_INFO,
bindingCount = 1,
pBindings = &binding,
}
result := vk.CreateDescriptorSetLayout(dev.device, &create_info, nil, &layout)
if result != .SUCCESS {
log.errorf("gpu/pipeline: vkCreateDescriptorSetLayout (UBO) failed: %v", result)
return {}, false
}
return layout, true
}
// Create a descriptor pool for uniform buffers
create_ubo_descriptor_pool :: proc(
dev: ^gpu.Gpu_Device,
max_sets: u32,
) -> (
pool: vk.DescriptorPool,
ok: bool,
) {
pool_size := vk.DescriptorPoolSize {
type = .UNIFORM_BUFFER,
descriptorCount = max_sets,
}
create_info := vk.DescriptorPoolCreateInfo {
sType = .DESCRIPTOR_POOL_CREATE_INFO,
flags = {.FREE_DESCRIPTOR_SET},
maxSets = max_sets,
poolSizeCount = 1,
pPoolSizes = &pool_size,
}
result := vk.CreateDescriptorPool(dev.device, &create_info, nil, &pool)
if result != .SUCCESS {
log.errorf("gpu/pipeline: vkCreateDescriptorPool (UBO) failed: %v", result)
return {}, false
}
return pool, true
}
// Write a buffer binding to a descriptor set
update_descriptor_set_buffer :: proc(
dev: ^gpu.Gpu_Device,
set: vk.DescriptorSet,
buffer: vk.Buffer,
size: vk.DeviceSize,
binding: u32 = 0,
) {
buffer_info := vk.DescriptorBufferInfo {
buffer = buffer,
offset = 0,
range = size,
}
write := vk.WriteDescriptorSet {
sType = .WRITE_DESCRIPTOR_SET,
dstSet = set,
dstBinding = binding,
dstArrayElement = 0,
descriptorCount = 1,
descriptorType = .UNIFORM_BUFFER,
pBufferInfo = &buffer_info,
}
vk.UpdateDescriptorSets(dev.device, 1, &write, 0, nil)
}
destroy_descriptor_pool :: proc(dev: ^gpu.Gpu_Device, pool: ^vk.DescriptorPool) {
if pool^ != 0 {
vk.DestroyDescriptorPool(dev.device, pool^, nil)
pool^ = 0
}
}
destroy_descriptor_set_layout :: proc(dev: ^gpu.Gpu_Device, layout: ^vk.DescriptorSetLayout) {
if layout^ != 0 {
vk.DestroyDescriptorSetLayout(dev.device, layout^, nil)
layout^ = 0
}
}