reshade_api_resource.hpp

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/*
 * Copyright (C) 2021 Patrick Mours
 * SPDX-License-Identifier: BSD-3-Clause OR MIT
 */
 
#pragma once
 
#define RESHADE_DEFINE_HANDLE(name) \
    typedef struct { uint64_t handle; } name; \
    constexpr bool operator< (name lhs, name rhs) { return lhs.handle < rhs.handle; } \
    constexpr bool operator!=(name lhs, name rhs) { return lhs.handle != rhs.handle; } \
    constexpr bool operator!=(name lhs, uint64_t rhs) { return lhs.handle != rhs; } \
    constexpr bool operator==(name lhs, name rhs) { return lhs.handle == rhs.handle; } \
    constexpr bool operator==(name lhs, uint64_t rhs) { return lhs.handle == rhs; }
 
#define RESHADE_DEFINE_ENUM_FLAG_OPERATORS(type) \
    constexpr type operator~(type a) { return static_cast<type>(~static_cast<uint32_t>(a)); } \
    inline type &operator&=(type &a, type b) { return reinterpret_cast<type &>(reinterpret_cast<uint32_t &>(a) &= static_cast<uint32_t>(b)); } \
    constexpr type operator&(type a, type b) { return static_cast<type>(static_cast<uint32_t>(a) & static_cast<uint32_t>(b)); } \
    inline type &operator|=(type &a, type b) { return reinterpret_cast<type &>(reinterpret_cast<uint32_t &>(a) |= static_cast<uint32_t>(b)); } \
    constexpr type operator|(type a, type b) { return static_cast<type>(static_cast<uint32_t>(a) | static_cast<uint32_t>(b)); } \
    inline type &operator^=(type &a, type b) { return reinterpret_cast<type &>(reinterpret_cast<uint32_t &>(a) ^= static_cast<uint32_t>(b)); } \
    constexpr type operator^(type a, type b) { return static_cast<type>(static_cast<uint32_t>(a) ^ static_cast<uint32_t>(b)); } \
    constexpr bool operator==(type lhs, uint32_t rhs) { return static_cast<uint32_t>(lhs) == rhs; } \
    constexpr bool operator!=(type lhs, uint32_t rhs) { return static_cast<uint32_t>(lhs) != rhs; }
 
#include "reshade_api_format.hpp"
 
namespace reshade { namespace api
{
    enum class compare_op : uint32_t
    {
        never = 0,
        less = 1,
        equal = 2,
        less_equal = 3,
        greater = 4,
        not_equal = 5,
        greater_equal = 6,
        always = 7
    };
 
    enum class filter_mode : uint32_t
    {
        min_mag_mip_point = 0,
        min_mag_point_mip_linear = 0x1,
        min_point_mag_linear_mip_point = 0x4,
        min_point_mag_mip_linear = 0x5,
        min_linear_mag_mip_point = 0x10,
        min_linear_mag_point_mip_linear = 0x11,
        min_mag_linear_mip_point = 0x14,
        min_mag_mip_linear = 0x15,
        min_mag_anisotropic_mip_point = 0x54,
        anisotropic = 0x55,
        compare_min_mag_mip_point = 0x80,
        compare_min_mag_point_mip_linear = 0x81,
        compare_min_point_mag_linear_mip_point = 0x84,
        compare_min_point_mag_mip_linear = 0x85,
        compare_min_linear_mag_mip_point = 0x90,
        compare_min_linear_mag_point_mip_linear = 0x91,
        compare_min_mag_linear_mip_point = 0x94,
        compare_min_mag_mip_linear = 0x95,
        compare_min_mag_anisotropic_mip_point = 0xd4,
        compare_anisotropic = 0xd5
    };
 
    enum class texture_address_mode : uint32_t
    {
        wrap = 1,
        mirror = 2,
        clamp = 3,
        border = 4,
        mirror_once = 5
    };
 
    struct sampler_desc
    {
        filter_mode filter = filter_mode::min_mag_mip_linear;
        texture_address_mode address_u = texture_address_mode::clamp;
        texture_address_mode address_v = texture_address_mode::clamp;
        texture_address_mode address_w = texture_address_mode::clamp;
        float mip_lod_bias = 0.0f;
        float max_anisotropy = 1.0f;
        compare_op compare_op = compare_op::never;
        float border_color[4] = { 1.0f, 1.0f, 1.0f, 1.0f };
        float min_lod = -FLT_MAX;
        float max_lod = +FLT_MAX;
    };
 
    RESHADE_DEFINE_HANDLE(sampler);
 
    enum class map_access
    {
        read_only = 1,
        write_only,
        read_write,
        write_discard
    };
 
    enum class memory_heap : uint32_t
    {
        unknown, // Usually indicates a resource that is reserved, but not yet bound to any memory.
        gpu_only,
        // Upload heap
        cpu_to_gpu,
        // Readback heap
        gpu_to_cpu,
        cpu_only,
        custom
    };
 
    enum class resource_type : uint32_t
    {
        unknown,
        buffer,
        texture_1d,
        texture_2d,
        texture_3d,
        surface // Special type for resources that are implicitly both resource and render target view.
    };
 
    enum class resource_flags : uint32_t
    {
        none = 0,
        dynamic = (1 << 3),
        cube_compatible = (1 << 2),
        generate_mipmaps = (1 << 0),
        shared = (1 << 1),
        shared_nt_handle = (1 << 11),
        structured = (1 << 6),
        sparse_binding = (1 << 18)
    };
    RESHADE_DEFINE_ENUM_FLAG_OPERATORS(resource_flags);
 
    enum class resource_usage : uint32_t
    {
        undefined = 0,
 
        index_buffer = 0x2,
        vertex_buffer = 0x1,
        constant_buffer = 0x8000,
        stream_output = 0x100,
        indirect_argument = 0x200,
 
        depth_stencil = 0x30,
        depth_stencil_read = 0x20,
        depth_stencil_write = 0x10,
        render_target = 0x4,
        shader_resource = 0xC0,
        shader_resource_pixel = 0x80,
        shader_resource_non_pixel = 0x40,
        unordered_access = 0x8,
 
        copy_dest = 0x400,
        copy_source = 0x800,
        resolve_dest = 0x1000,
        resolve_source = 0x2000,
 
        acceleration_structure = 0x400000,
 
        // The following are special resource states and may only be used in barriers:
 
        general = 0x80000000,
        present = 0x80000000 | render_target | copy_source,
        cpu_access = vertex_buffer | index_buffer | shader_resource | indirect_argument | copy_source
    };
    RESHADE_DEFINE_ENUM_FLAG_OPERATORS(resource_usage);
 
    struct [[nodiscard]] resource_desc
    {
        constexpr resource_desc() : texture() {}
        constexpr resource_desc(uint64_t size, memory_heap heap, resource_usage usage) :
            type(resource_type::buffer), buffer({ size }), heap(heap), usage(usage) {}
        constexpr resource_desc(uint32_t width, uint32_t height, uint16_t layers, uint16_t levels, format format, uint16_t samples, memory_heap heap, resource_usage usage, resource_flags flags = resource_flags::none) :
            type(resource_type::texture_2d), texture({ width, height, layers, levels, format, samples }), heap(heap), usage(usage), flags(flags) {}
        constexpr resource_desc(resource_type type, uint32_t width, uint32_t height, uint16_t depth_or_layers, uint16_t levels, format format, uint16_t samples, memory_heap heap, resource_usage usage, resource_flags flags = resource_flags::none) :
            type(type), texture({ width, height, depth_or_layers, levels, format, samples }), heap(heap), usage(usage), flags(flags) {}
 
        resource_type type = resource_type::unknown;
 
        union
        {
            struct
            {
                uint64_t size = 0;
                uint32_t stride = 0;
            } buffer;
 
            struct
            {
                uint32_t width = 1;
                uint32_t height = 1;
                uint16_t depth_or_layers = 1;
                uint16_t levels = 1;
                format   format = format::unknown;
                uint16_t samples = 1;
            } texture;
        };
 
        memory_heap heap = memory_heap::unknown;
        resource_usage usage = resource_usage::undefined;
        resource_flags flags = resource_flags::none;
    };
 
    RESHADE_DEFINE_HANDLE(resource);
 
    enum class resource_view_type : uint32_t
    {
        unknown,
        buffer,
        texture_1d,
        texture_1d_array,
        texture_2d,
        texture_2d_array,
        texture_2d_multisample,
        texture_2d_multisample_array,
        texture_3d,
        texture_cube,
        texture_cube_array,
        acceleration_structure
    };
 
    struct [[nodiscard]] resource_view_desc
    {
        constexpr resource_view_desc() : texture() {}
        constexpr resource_view_desc(format format, uint64_t offset, uint64_t size) :
            type(resource_view_type::buffer), format(format), buffer({ offset, size }) {}
        constexpr resource_view_desc(format format, uint32_t first_level, uint32_t levels, uint32_t first_layer, uint32_t layers) :
            type(resource_view_type::texture_2d), format(format), texture({ first_level, levels, first_layer, layers }) {}
        constexpr resource_view_desc(resource_view_type type, format format, uint64_t offset, uint64_t size) :
            type(type), format(format), buffer({ offset, size }) {}
        constexpr resource_view_desc(resource_view_type type, format format, uint32_t first_level, uint32_t levels, uint32_t first_layer, uint32_t layers) :
            type(type), format(format), texture({ first_level, levels, first_layer, layers }) {}
        constexpr explicit resource_view_desc(format format) : type(resource_view_type::texture_2d), format(format), texture({ 0, 1, 0, 1 }) {}
 
        resource_view_type type = resource_view_type::unknown;
        format format = format::unknown;
 
        union
        {
            struct
            {
                uint64_t offset = 0;
                uint64_t size = UINT64_MAX;
            } buffer;
 
            struct
            {
                uint32_t first_level = 0;
                uint32_t level_count = UINT32_MAX;
                uint32_t first_layer = 0;
                uint32_t layer_count = UINT32_MAX;
            } texture;
        };
    };
 
    RESHADE_DEFINE_HANDLE(resource_view);
 
    struct subresource_box
    {
        int32_t left = 0;
        int32_t top = 0;
        int32_t front = 0;
        int32_t right = 0;
        int32_t bottom = 0;
        int32_t back = 0;
 
        constexpr uint32_t width() const { return right - left; }
        constexpr uint32_t height() const { return bottom - top; }
        constexpr uint32_t depth() const { return back - front; }
    };
 
    struct subresource_data
    {
        void *data = nullptr;
        uint32_t row_pitch = 0;
        uint32_t slice_pitch = 0;
    };
 
    enum class render_pass_load_op : uint32_t
    {
        load,
        clear,
        discard,
        no_access
    };
 
    enum class render_pass_store_op : uint32_t
    {
        store,
        discard,
        no_access
    };
 
    struct render_pass_depth_stencil_desc
    {
        resource_view view = { 0 };
        render_pass_load_op depth_load_op = render_pass_load_op::load;
        render_pass_store_op depth_store_op = render_pass_store_op::store;
        render_pass_load_op stencil_load_op = render_pass_load_op::load;
        render_pass_store_op stencil_store_op = render_pass_store_op::store;
        float clear_depth = 0.0f;
        uint8_t clear_stencil = 0;
    };
 
    struct render_pass_render_target_desc
    {
        resource_view view = { 0 };
        render_pass_load_op load_op = render_pass_load_op::load;
        render_pass_store_op store_op = render_pass_store_op::store;
        float clear_color[4] = { 0.0f, 0.0f, 0.0f, 0.0f };
    };
 
    enum class acceleration_structure_type
    {
        top_level = 0,
        bottom_level = 1,
        generic = 2
    };
 
    enum class acceleration_structure_copy_mode
    {
        clone = 0,
        compact = 1,
        serialize = 2,
        deserialize = 3
    };
 
    enum class acceleration_structure_build_mode
    {
        build = 0,
        update = 1
    };
 
    enum class acceleration_structure_build_flags : uint32_t
    {
        none = 0,
        allow_update = (1 << 0),
        allow_compaction = (1 << 1),
        prefer_fast_trace = (1 << 2),
        prefer_fast_build = (1 << 3),
        minimize_memory_usage = (1 << 4)
    };
    RESHADE_DEFINE_ENUM_FLAG_OPERATORS(acceleration_structure_build_flags);
 
    enum class acceleration_structure_build_input_type : uint32_t
    {
        triangles = 0,
        aabbs = 1,
        instances = 2
    };
 
    enum class acceleration_structure_build_input_flags : uint32_t
    {
        none = 0,
        opaque = (1 << 0),
        no_duplicate_any_hit_invocation = (1 << 1)
    };
    RESHADE_DEFINE_ENUM_FLAG_OPERATORS(acceleration_structure_build_input_flags);
 
    struct acceleration_structure_instance
    {
        float transform[3][4];
        uint32_t custom_index : 24;
        uint32_t mask : 8;
        uint32_t shader_binding_table_offset : 24;
        uint32_t flags : 8;
        uint64_t acceleration_structure_gpu_address;
    };
 
    struct acceleration_structure_build_input
    {
        constexpr acceleration_structure_build_input() : triangles() {}
        constexpr acceleration_structure_build_input(api::resource vertex_buffer, uint64_t vertex_offset, uint32_t vertex_count, uint64_t vertex_stride, api::format vertex_format, api::resource index_buffer, uint64_t index_offset, uint32_t index_count, api::format index_format, uint64_t transform_address = 0) : type(acceleration_structure_build_input_type::triangles), triangles({ vertex_buffer, vertex_offset, vertex_count, vertex_stride, vertex_format, index_buffer, index_offset, index_count, index_format, transform_address }) {}
        constexpr acceleration_structure_build_input(api::resource aabb_buffer, uint64_t aabb_offset, uint32_t aabb_count, uint64_t aabb_stride) : type(acceleration_structure_build_input_type::aabbs), aabbs({ aabb_buffer, aabb_offset, aabb_count, aabb_stride }) {}
        constexpr acceleration_structure_build_input(api::resource instance_buffer, uint64_t instance_offset, uint32_t instance_count, bool array_of_pointers = false) : type(acceleration_structure_build_input_type::instances), instances({ instance_buffer, instance_offset, instance_count, array_of_pointers }) {}
 
        acceleration_structure_build_input_type type = acceleration_structure_build_input_type::triangles;
 
        union
        {
            struct
            {
                api::resource vertex_buffer = {};
                uint64_t vertex_offset = 0;
                uint32_t vertex_count = 0;
                uint64_t vertex_stride = 0;
                api::format vertex_format = api::format::unknown;
                api::resource index_buffer = {};
                uint64_t index_offset = 0;
                uint32_t index_count = 0;
                api::format index_format = api::format::unknown;
                api::resource transform_buffer = {};
                uint64_t transform_offset = 0;
            } triangles;
 
            struct
            {
                api::resource buffer = {};
                uint64_t offset = 0;
                uint32_t count = 0;
                uint64_t stride = 0;
            } aabbs;
 
            struct
            {
                api::resource buffer = {};
                uint64_t offset = 0;
                uint32_t count = 0;
                bool array_of_pointers = false;
            } instances;
        };
 
        acceleration_structure_build_input_flags flags = acceleration_structure_build_input_flags::none;
    };
} }