bind.h

#pragma once
 
#include <kiba/containers/array.h>
#include <kiba/gpu/enums.h>
#include <kiba/gpu/types.h>
 
struct gpu_binding_type_buffer {
    enum {
        GPU_BINDING_TYPE_BUFFER_UNIFORM,
        GPU_BINDING_TYPE_BUFFER_STORAGE,
        GPU_BINDING_TYPE_BUFFER_STORAGE_RO,
    } type;
 
    b8 dynamic_offset;
    // TODO potentially implement min_binding_size
};
 
struct gpu_binding_type_sampler {
    enum {
        GPU_BINDING_TYPE_SAMPLER_FILTERING,
        GPU_BINDING_TYPE_SAMPLER_NON_FILTERING,
        GPU_BINDING_TYPE_SAMPLER_COMPARISON,
    } type;
};
 
struct gpu_binding_type_texture {
    enum {
        GPU_TEXTURE_SAMPLE_TYPE_FLOAT,
        GPU_TEXTURE_SAMPLE_TYPE_DEPTH,
        GPU_TEXTURE_SAMPLE_TYPE_SINT,
        GPU_TEXTURE_SAMPLE_TYPE_UINT,
    } sample_type;
 
    enum gpu_texture_view_dimension view_dimension;
 
    b8 multisampled;
};
 
struct gpu_binding_type_storage_texture {
    enum {
        GPU_STORAGE_TEXTURE_ACCESS_RO,
        GPU_STORAGE_TEXTURE_ACCESS_WO,
        GPU_STORAGE_TEXTURE_ACCESS_RW,
    } access;
    enum gpu_texture_format format;
    enum gpu_texture_view_dimension view_dimension;
};
 
struct gpu_bind_group_layout_entry {
    usize                 binding;
    enum gpu_shader_stage visibility;
 
    union {
        struct gpu_binding_type_buffer          buffer;
        struct gpu_binding_type_sampler         sampler;
        struct gpu_binding_type_texture         texture;
        struct gpu_binding_type_storage_texture storage_texture;
    } ty;
 
    // TODO consider adding `count` to be able to bind arrays in gpu_bind_group_entry
};
 
struct gpu_bind_group_layout_descriptor {
    array_of(struct gpu_bind_group_layout_entry) entries;
};
 
typedef VkDescriptorSetLayout gpu_bind_group_layout;
 
struct gpu_bind_group_entry {
    usize binding;
 
    union {
        struct {
            void *handle;
            usize offset;
            usize size;
        } buffer;
 
        void *sampler;  // TODO proper handles
        void *texture_view;
    } resource;
};
 
struct gpu_bind_group_descriptor {
    gpu_bind_group_layout layout;
    array_of(struct gpu_bind_group_entry) entries;
};