ops.c

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/**
 * Copyright (C) 2026 Lynne
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
 
#include "libavutil/mem.h"
#include "libavutil/refstruct.h"
 
#include "../ops_internal.h"
#include "../swscale_internal.h"
 
#include "ops.h"
 
#if HAVE_SPIRV_HEADERS_SPIRV_H || HAVE_SPIRV_UNIFIED1_SPIRV_H
#include "spvasm.h"
#endif
 
static void ff_sws_vk_uninit(AVRefStructOpaque opaque, void *obj)
{
    FFVulkanOpsCtx *s = obj;
 
#if CONFIG_LIBSHADERC || CONFIG_LIBGLSLANG
    if (s->spvc)
        s->spvc->uninit(&s->spvc);
#endif
    ff_vk_uninit(&s->vkctx);
}
 
int ff_sws_vk_init(SwsContext *sws, AVBufferRef *dev_ref)
{
    int err;
    SwsInternal *c = sws_internal(sws);
 
    if (!c->hw_priv) {
        c->hw_priv = av_refstruct_alloc_ext(sizeof(FFVulkanOpsCtx), 0, NULL,
                                            ff_sws_vk_uninit);
        if (!c->hw_priv)
            return AVERROR(ENOMEM);
    }
 
    FFVulkanOpsCtx *s = c->hw_priv;
    if (s->vkctx.device_ref && s->vkctx.device_ref->data != dev_ref->data) {
        /* Reinitialize with new context */
        ff_vk_uninit(&s->vkctx);
    } else if (s->vkctx.device_ref && s->vkctx.device_ref->data == dev_ref->data) {
        return 0;
    }
 
    err = ff_vk_init(&s->vkctx, sws, dev_ref, NULL);
    if (err < 0)
        return err;
 
    s->qf = ff_vk_qf_find(&s->vkctx, VK_QUEUE_COMPUTE_BIT, 0);
    if (!s->qf) {
        av_log(sws, AV_LOG_ERROR, "Device has no compute queues\n");
        return AVERROR(ENOTSUP);
    }
 
#if CONFIG_LIBSHADERC || CONFIG_LIBGLSLANG
    if (!s->spvc) {
        s->spvc = ff_vk_spirv_init();
        if (!s->spvc)
            return AVERROR(ENOMEM);
    }
#endif
 
    return 0;
}
 
#define MAX_DITHER_BUFS 4
 
typedef struct VulkanPriv {
    FFVulkanOpsCtx *s;
    FFVkExecPool e;
    FFVulkanShader shd;
    FFVkBuffer dither_buf[MAX_DITHER_BUFS];
    int nb_dither_buf;
    enum FFVkShaderRepFormat src_rep;
    enum FFVkShaderRepFormat dst_rep;
} VulkanPriv;
 
static void process(const SwsFrame *dst, const SwsFrame *src, int y, int h,
                    const SwsPass *pass)
{
    VulkanPriv *p = (VulkanPriv *) pass->priv;
    FFVkExecContext *ec = ff_vk_exec_get(&p->s->vkctx, &p->e);
    FFVulkanFunctions *vk = &p->s->vkctx.vkfn;
    ff_vk_exec_start(&p->s->vkctx, ec);
 
    AVFrame *src_f = (AVFrame *) src->avframe;
    AVFrame *dst_f = (AVFrame *) dst->avframe;
    ff_vk_exec_add_dep_frame(&p->s->vkctx, ec, src_f,
                             VK_PIPELINE_STAGE_2_ALL_COMMANDS_BIT,
                             VK_PIPELINE_STAGE_2_COMPUTE_SHADER_BIT);
    ff_vk_exec_add_dep_frame(&p->s->vkctx, ec, dst_f,
                             VK_PIPELINE_STAGE_2_ALL_COMMANDS_BIT,
                             VK_PIPELINE_STAGE_2_COMPUTE_SHADER_BIT);
 
    VkImageView src_views[AV_NUM_DATA_POINTERS];
    VkImageView dst_views[AV_NUM_DATA_POINTERS];
    ff_vk_create_imageviews(&p->s->vkctx, ec, src_views, src_f, p->src_rep);
    ff_vk_create_imageviews(&p->s->vkctx, ec, dst_views, dst_f, p->dst_rep);
 
    ff_vk_shader_update_img_array(&p->s->vkctx, ec, &p->shd, src_f, src_views,
                                  0, 0, VK_IMAGE_LAYOUT_GENERAL, VK_NULL_HANDLE);
    ff_vk_shader_update_img_array(&p->s->vkctx, ec, &p->shd, dst_f, dst_views,
                                  0, 1, VK_IMAGE_LAYOUT_GENERAL, VK_NULL_HANDLE);
 
    int nb_img_bar = 0;
    VkImageMemoryBarrier2 img_bar[8];
    ff_vk_frame_barrier(&p->s->vkctx, ec, src_f, img_bar, &nb_img_bar,
                        VK_PIPELINE_STAGE_2_ALL_COMMANDS_BIT,
                        VK_PIPELINE_STAGE_2_COMPUTE_SHADER_BIT,
                        VK_ACCESS_SHADER_READ_BIT,
                        VK_IMAGE_LAYOUT_GENERAL,
                        VK_QUEUE_FAMILY_IGNORED);
    ff_vk_frame_barrier(&p->s->vkctx, ec, dst_f, img_bar, &nb_img_bar,
                        VK_PIPELINE_STAGE_2_ALL_COMMANDS_BIT,
                        VK_PIPELINE_STAGE_2_COMPUTE_SHADER_BIT,
                        VK_ACCESS_SHADER_WRITE_BIT,
                        VK_IMAGE_LAYOUT_GENERAL,
                        VK_QUEUE_FAMILY_IGNORED);
    vk->CmdPipelineBarrier2(ec->buf, &(VkDependencyInfo) {
        .sType = VK_STRUCTURE_TYPE_DEPENDENCY_INFO,
        .pImageMemoryBarriers = img_bar,
        .imageMemoryBarrierCount = nb_img_bar,
    });
 
    ff_vk_exec_bind_shader(&p->s->vkctx, ec, &p->shd);
 
    vk->CmdDispatch(ec->buf,
                    FFALIGN(src_f->width, p->shd.lg_size[0])/p->shd.lg_size[0],
                    FFALIGN(src_f->height, p->shd.lg_size[1])/p->shd.lg_size[1],
                    1);
 
    ff_vk_exec_submit(&p->s->vkctx, ec);
    ff_vk_exec_wait(&p->s->vkctx, ec);
}
 
static void free_fn(void *priv)
{
    VulkanPriv *p = priv;
    ff_vk_exec_pool_free(&p->s->vkctx, &p->e);
    ff_vk_shader_free(&p->s->vkctx, &p->shd);
    for (int i = 0; i < p->nb_dither_buf; i++)
        ff_vk_free_buf(&p->s->vkctx, &p->dither_buf[i]);
    av_refstruct_unref(&p->s);
    av_free(priv);
}
 
static int create_dither_bufs(FFVulkanOpsCtx *s, VulkanPriv *p, SwsOpList *ops)
{
    int err;
    p->nb_dither_buf = 0;
    for (int n = 0; n < ops->num_ops; n++) {
        const SwsOp *op = &ops->ops[n];
        if (op->op != SWS_OP_DITHER)
            continue;
        av_assert0(p->nb_dither_buf + 1 <= MAX_DITHER_BUFS);
 
        int size = (1 << op->dither.size_log2);
        int idx = p->nb_dither_buf;
        err = ff_vk_create_buf(&s->vkctx, &p->dither_buf[idx],
                               size*size*sizeof(float), NULL, NULL,
                               VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
                               VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT |
                               VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT);
        if (err < 0)
            goto fail;
        p->nb_dither_buf++;
 
        float *dither_data;
        err = ff_vk_map_buffer(&s->vkctx, &p->dither_buf[idx],
                               (uint8_t **)&dither_data, 0);
        if (err < 0)
            goto fail;
 
        for (int i = 0; i < size; i++) {
            for (int j = 0; j < size; j++) {
                const AVRational r = op->dither.matrix[i*size + j];
                dither_data[i*size + j] = r.num/(float)r.den;
            }
        }
 
        ff_vk_unmap_buffer(&s->vkctx, &p->dither_buf[idx], 1);
    }
 
    return 0;
 
fail:
    for (int i = 0; i < p->nb_dither_buf; i++)
        ff_vk_free_buf(&p->s->vkctx, &p->dither_buf[i]);
    return err;
}
 
#if HAVE_SPIRV_HEADERS_SPIRV_H || HAVE_SPIRV_UNIFIED1_SPIRV_H
struct DitherData {
        int size;
        int arr_1d_id;
        int arr_2d_id;
        int struct_id;
        int struct_ptr_id;
        int id;
        int mask_id;
};
 
typedef struct SPIRVIDs {
    int in_vars[3 + MAX_DITHER_BUFS];
 
    int glfn;
    int ep;
 
    /* Types */
    int void_type;
    int b_type;
    int u32_type;
    int i32_type;
    int f32_type;
    int void_fn_type;
 
    /* Define vector types */
    int bvec2_type;
    int u32vec2_type;
    int i32vec2_type;
 
    int u32vec3_type;
 
    int u32vec4_type;
    int f32vec4_type;
 
    /* Constants */
    int u32_p;
    int f32_p;
    int f32_0;
    int u32_cid[5];
 
    int const_ids[128];
    int nb_const_ids;
 
    int linear_deco_off[16];
    int linear_deco_ops[16];
    int nb_linear_ops;
 
    struct DitherData dither[MAX_DITHER_BUFS];
    int dither_ptr_elem_id;
    int nb_dither_bufs;
 
    int out_img_type;
    int out_img_array_id;
 
    int in_img_type;
    int in_img_array_id;
 
    /* Pointer types for images */
    int u32vec3_tptr;
    int out_img_tptr;
    int out_img_sptr;
 
    int in_img_tptr;
    int in_img_sptr;
} SPIRVIDs;
 
/* Section 1: Function to define all shader header data, and decorations */
static void define_shader_header(FFVulkanShader *shd, SwsOpList *ops,
                                 SPICtx *spi, SPIRVIDs *id)
{
    spi_OpCapability(spi, SpvCapabilityShader); /* Shader type */
 
    /* Declare required capabilities */
    spi_OpCapability(spi, SpvCapabilityInt16);
    spi_OpCapability(spi, SpvCapabilityInt8);
    spi_OpCapability(spi, SpvCapabilityImageQuery);
    spi_OpCapability(spi, SpvCapabilityStorageImageReadWithoutFormat);
    spi_OpCapability(spi, SpvCapabilityStorageImageWriteWithoutFormat);
    spi_OpCapability(spi, SpvCapabilityStorageBuffer8BitAccess);
    /* Import the GLSL set of functions (used for min/max) */
    id->glfn = spi_OpExtInstImport(spi, "GLSL.std.450");
 
    /* Next section starts here */
    spi_OpMemoryModel(spi, SpvAddressingModelLogical, SpvMemoryModelGLSL450);
 
    /* Entrypoint */
    id->ep = spi_OpEntryPoint(spi, SpvExecutionModelGLCompute, "main",
                                id->in_vars, 3 + id->nb_dither_bufs);
    spi_OpExecutionMode(spi, id->ep, SpvExecutionModeLocalSize,
                        shd->lg_size, 3);
 
    /* gl_GlobalInvocationID descriptor decorations */
    spi_OpDecorate(spi, id->in_vars[0], SpvDecorationBuiltIn,
                   SpvBuiltInGlobalInvocationId);
 
    /* Input image descriptor decorations */
    spi_OpDecorate(spi, id->in_vars[1], SpvDecorationNonWritable);
    spi_OpDecorate(spi, id->in_vars[1], SpvDecorationDescriptorSet, 0);
    spi_OpDecorate(spi, id->in_vars[1], SpvDecorationBinding, 0);
 
    /* Output image descriptor decorations */
    spi_OpDecorate(spi, id->in_vars[2], SpvDecorationNonReadable);
    spi_OpDecorate(spi, id->in_vars[2], SpvDecorationDescriptorSet, 0);
    spi_OpDecorate(spi, id->in_vars[2], SpvDecorationBinding, 1);
 
    for (int i = 0; i < id->nb_dither_bufs; i++) {
        spi_OpDecorate(spi, id->dither[i].arr_1d_id, SpvDecorationArrayStride,
                       sizeof(float));
        spi_OpDecorate(spi, id->dither[i].arr_2d_id, SpvDecorationArrayStride,
                       id->dither[i].size*sizeof(float));
        spi_OpDecorate(spi, id->dither[i].struct_id, SpvDecorationBlock);
        spi_OpMemberDecorate(spi, id->dither[i].struct_id, 0, SpvDecorationOffset, 0);
        spi_OpDecorate(spi, id->dither[i].id, SpvDecorationDescriptorSet, 1);
        spi_OpDecorate(spi, id->dither[i].id, SpvDecorationBinding, i);
    }
 
    /* All linear arithmetic ops must be decorated with NoContraction */
    for (int n = 0; n < ops->num_ops; n++) {
        const SwsOp *op = &ops->ops[n];
        if (op->op != SWS_OP_LINEAR)
            continue;
        av_assert0((id->nb_linear_ops + 1) <= FF_ARRAY_ELEMS(id->linear_deco_off));
 
        int nb_ops = 0;
        for (int j = 0; j < 4; j++) {
            nb_ops += !!op->lin.m[j][0].num;
            nb_ops += op->lin.m[j][0].num && op->lin.m[j][4].num;
            for (int i = 1; i < 4; i++) {
                nb_ops += !!op->lin.m[j][i].num;
                nb_ops += op->lin.m[j][i].num &&
                          (op->lin.m[j][0].num || op->lin.m[j][4].num);
            }
        }
 
        id->linear_deco_off[id->nb_linear_ops] = spi_reserve(spi, nb_ops*4*3);
        id->linear_deco_ops[id->nb_linear_ops] = nb_ops;
        id->nb_linear_ops++;
    }
}
 
/* Section 2: Define all types and constants */
static void define_shader_consts(SwsOpList *ops, SPICtx *spi, SPIRVIDs *id)
{
    /* Define scalar types */
    id->void_type    = spi_OpTypeVoid(spi);
    id->b_type       = spi_OpTypeBool(spi);
    int u32_type =
        id->u32_type = spi_OpTypeInt(spi, 32, 0);
    id->i32_type     = spi_OpTypeInt(spi, 32, 1);
    int f32_type =
        id->f32_type = spi_OpTypeFloat(spi, 32);
    id->void_fn_type = spi_OpTypeFunction(spi, id->void_type, NULL, 0);
 
    /* Define vector types */
    id->bvec2_type   = spi_OpTypeVector(spi, id->b_type,   2);
    id->u32vec2_type = spi_OpTypeVector(spi, u32_type, 2);
    id->i32vec2_type = spi_OpTypeVector(spi, id->i32_type, 2);
 
    id->u32vec3_type = spi_OpTypeVector(spi, u32_type, 3);
 
    id->u32vec4_type = spi_OpTypeVector(spi, u32_type, 4);
    id->f32vec4_type = spi_OpTypeVector(spi, f32_type, 4);
 
    /* Constants */
    id->u32_p = spi_OpUndef(spi, u32_type);
    id->f32_p = spi_OpUndef(spi, f32_type);
    id->f32_0 = spi_OpConstantFloat(spi, f32_type, 0);
    for (int i = 0; i < 5; i++)
        id->u32_cid[i] = spi_OpConstantUInt(spi, u32_type, i);
 
    /* Operation constants */
    id->nb_const_ids = 0;
    for (int n = 0; n < ops->num_ops; n++) {
        /* Make sure there's always enough space for the maximum number of
         * constants a single operation needs (currently linear, 20 consts). */
        av_assert0((id->nb_const_ids + 20) <= FF_ARRAY_ELEMS(id->const_ids));
        const SwsOp *op = &ops->ops[n];
        switch (op->op) {
        case SWS_OP_CONVERT:
            if (ff_sws_pixel_type_is_int(op->convert.to) && op->convert.expand) {
                AVRational m = ff_sws_pixel_expand(op->type, op->convert.to);
                int tmp = spi_OpConstantUInt(spi, id->u32_type, m.num);
                tmp = spi_OpConstantComposite(spi, id->u32vec4_type,
                                              tmp, tmp, tmp, tmp);
                id->const_ids[id->nb_const_ids++] = tmp;
            }
            break;
        case SWS_OP_CLEAR:
            for (int i = 0; i < 4; i++) {
                AVRational cv = op->clear.value[i];
                if (cv.den && op->type == SWS_PIXEL_F32) {
                    float q = (float)cv.num/cv.den;
                    id->const_ids[id->nb_const_ids++] =
                        spi_OpConstantFloat(spi, f32_type, q);
                } else if (op->clear.value[i].den) {
                    av_assert0(cv.den == 1);
                    id->const_ids[id->nb_const_ids++] =
                        spi_OpConstantUInt(spi, u32_type, cv.num);
                }
            }
            break;
        case SWS_OP_LSHIFT:
        case SWS_OP_RSHIFT: {
            int tmp = spi_OpConstantUInt(spi, u32_type, op->shift.amount);
            tmp = spi_OpConstantComposite(spi, id->u32vec4_type,
                                          tmp, tmp, tmp, tmp);
            id->const_ids[id->nb_const_ids++] = tmp;
            break;
        }
        case SWS_OP_SCALE: {
            int tmp;
            if (op->type == SWS_PIXEL_F32) {
                float q = op->scale.factor.num/(float)op->scale.factor.den;
                tmp = spi_OpConstantFloat(spi, f32_type, q);
                tmp = spi_OpConstantComposite(spi, id->f32vec4_type,
                                              tmp, tmp, tmp, tmp);
            } else {
                av_assert0(op->scale.factor.den == 1);
                tmp = spi_OpConstantUInt(spi, u32_type, op->scale.factor.num);
                tmp = spi_OpConstantComposite(spi, id->u32vec4_type,
                                              tmp, tmp, tmp, tmp);
            }
            id->const_ids[id->nb_const_ids++] = tmp;
            break;
        }
        case SWS_OP_MIN:
        case SWS_OP_MAX:
            for (int i = 0; i < 4; i++) {
                int tmp;
                AVRational cl = op->clamp.limit[i];
                if (!op->clamp.limit[i].den) {
                    continue;
                } else if (op->type == SWS_PIXEL_F32) {
                    float q = (float)cl.num/((float)cl.den);
                    tmp = spi_OpConstantFloat(spi, f32_type, q);
                } else {
                    av_assert0(cl.den == 1);
                    tmp = spi_OpConstantUInt(spi, u32_type, cl.num);
                }
                id->const_ids[id->nb_const_ids++] = tmp;
            }
            break;
        case SWS_OP_DITHER:
            for (int i = 0; i < 4; i++) {
                if (op->dither.y_offset[i] < 0)
                    continue;
                int tmp = spi_OpConstantUInt(spi, u32_type, op->dither.y_offset[i]);
                id->const_ids[id->nb_const_ids++] = tmp;
            }
            break;
        case SWS_OP_LINEAR: {
            for (int i = 0; i < 4; i++) {
                float val;
                if (op->lin.m[i][0].num) {
                    val = op->lin.m[i][0].num/(float)op->lin.m[i][0].den;
                    id->const_ids[id->nb_const_ids++] =
                        spi_OpConstantFloat(spi, f32_type, val);
                }
                if (op->lin.m[i][4].num) {
                    val = op->lin.m[i][4].num/(float)op->lin.m[i][4].den;
                    id->const_ids[id->nb_const_ids++] =
                        spi_OpConstantFloat(spi, f32_type, val);
                }
                for (int j = 1; j < 4; j++) {
                    if (!op->lin.m[i][j].num)
                        continue;
                    val = op->lin.m[i][j].num/(float)op->lin.m[i][j].den;
                    id->const_ids[id->nb_const_ids++] =
                        spi_OpConstantFloat(spi, f32_type, val);
                }
            }
            break;
        }
        default:
            break;
        }
    }
}
 
/* Section 3: Define bindings */
static void define_shader_bindings(SwsOpList *ops, SPICtx *spi, SPIRVIDs *id,
                                   int in_img_count, int out_img_count)
{
    id->dither_ptr_elem_id = spi_OpTypePointer(spi, SpvStorageClassUniform,
                                                 id->f32_type);
 
    struct DitherData *dither = id->dither;
    for (int i = 0; i < id->nb_dither_bufs; i++) {
        int size_id = spi_OpConstantUInt(spi, id->u32_type, dither[i].size);
        dither[i].mask_id = spi_OpConstantUInt(spi, id->u32_type, dither[i].size - 1);
        spi_OpTypeArray(spi, id->f32_type, dither[i].arr_1d_id, size_id);
        spi_OpTypeArray(spi, dither[i].arr_1d_id, dither[i].arr_2d_id, size_id);
        spi_OpTypeStruct(spi, dither[i].struct_id, dither[i].arr_2d_id);
        dither[i].struct_ptr_id = spi_OpTypePointer(spi, SpvStorageClassUniform,
                                                    dither[i].struct_id);
        dither[i].id = spi_OpVariable(spi, dither[i].id, dither[i].struct_ptr_id,
                                      SpvStorageClassUniform, 0);
    }
 
    const SwsOp *op_w = ff_sws_op_list_output(ops);
    const SwsOp *op_r = ff_sws_op_list_input(ops);
 
    /* Define image types for descriptors */
    id->out_img_type = spi_OpTypeImage(spi,
                                       op_w->type == SWS_PIXEL_F32 ?
                                       id->f32_type : id->u32_type,
                                       2, 0, 0, 0, 2, SpvImageFormatUnknown);
    id->out_img_array_id = spi_OpTypeArray(spi, id->out_img_type, spi_get_id(spi),
                                           id->u32_cid[out_img_count]);
 
    id->in_img_type = 0;
    id->in_img_array_id = 0;
    if (op_r) {
        /* If the formats match, we have to reuse the types due to SPIR-V not
         * allowing redundant type defines */
        int match = ((op_w->type == SWS_PIXEL_F32) ==
                     (op_r->type == SWS_PIXEL_F32));
        id->in_img_type = match ? id->out_img_type :
                            spi_OpTypeImage(spi,
                                            op_r->type == SWS_PIXEL_F32 ?
                                            id->f32_type : id->u32_type,
                                            2, 0, 0, 0, 2, SpvImageFormatUnknown);
        id->in_img_array_id = spi_OpTypeArray(spi, id->in_img_type, spi_get_id(spi),
                                          id->u32_cid[in_img_count]);
    }
 
    /* Pointer types for images */
    id->u32vec3_tptr = spi_OpTypePointer(spi, SpvStorageClassInput,
                                         id->u32vec3_type);
    id->out_img_tptr = spi_OpTypePointer(spi, SpvStorageClassUniformConstant,
                                         id->out_img_array_id);
    id->out_img_sptr = spi_OpTypePointer(spi, SpvStorageClassUniformConstant,
                                         id->out_img_type);
 
    id->in_img_tptr = 0;
    id->in_img_sptr = 0;
    if (op_r) {
        id->in_img_tptr= spi_OpTypePointer(spi, SpvStorageClassUniformConstant,
                                           id->in_img_array_id);
        id->in_img_sptr= spi_OpTypePointer(spi, SpvStorageClassUniformConstant,
                                           id->in_img_type);
    }
 
    /* Define inputs */
    spi_OpVariable(spi, id->in_vars[0], id->u32vec3_tptr,
                   SpvStorageClassInput, 0);
    if (op_r) {
        spi_OpVariable(spi, id->in_vars[1], id->in_img_tptr,
                       SpvStorageClassUniformConstant, 0);
    }
    spi_OpVariable(spi, id->in_vars[2], id->out_img_tptr,
                   SpvStorageClassUniformConstant, 0);
}
 
static int add_ops_spirv(VulkanPriv *p, FFVulkanOpsCtx *s,
                         SwsOpList *ops, FFVulkanShader *shd)
{
    uint8_t spvbuf[1024*16];
    SPICtx spi_context = { 0 }, *spi = &spi_context;
    SPIRVIDs spid_data = { 0 }, *id = &spid_data;
    spi_init(spi, spvbuf, sizeof(spvbuf));
 
    /* Interlaced formats are not currently supported */
    if (ops->src.interlaced || ops->dst.interlaced)
        return AVERROR(ENOTSUP);
 
    ff_vk_shader_load(shd, VK_SHADER_STAGE_COMPUTE_BIT, NULL,
                      (uint32_t []) { 32, 32, 1 }, 0);
    shd->precompiled = 0;
 
    /* Image ops, to determine types */
    const SwsOp *op_w = ff_sws_op_list_output(ops);
    int out_img_count = op_w->rw.packed ? 1 : op_w->rw.elems;
    p->dst_rep = op_w->type == SWS_PIXEL_F32 ? FF_VK_REP_FLOAT : FF_VK_REP_UINT;
 
    const SwsOp *op_r = ff_sws_op_list_input(ops);
    int in_img_count = op_r ? op_r->rw.packed ? 1 : op_r->rw.elems : 0;
    if (op_r)
        p->src_rep = op_r->type == SWS_PIXEL_F32 ? FF_VK_REP_FLOAT : FF_VK_REP_UINT;
 
    FFVulkanDescriptorSetBinding desc_set[MAX_DITHER_BUFS] = {
        {
            .type = VK_DESCRIPTOR_TYPE_STORAGE_IMAGE,
            .stages = VK_SHADER_STAGE_COMPUTE_BIT,
            .elems = 4,
        },
        {
            .type = VK_DESCRIPTOR_TYPE_STORAGE_IMAGE,
            .stages = VK_SHADER_STAGE_COMPUTE_BIT,
            .elems = 4,
        },
    };
    ff_vk_shader_add_descriptor_set(&s->vkctx, shd, desc_set, 2, 0, 0);
 
    /* Create dither buffers */
    int err = create_dither_bufs(s, p, ops);
    if (err < 0)
        return err;
 
    /* Entrypoint inputs: gl_GlobalInvocationID, input and output images, dither */
    id->in_vars[0] = spi_get_id(spi);
    id->in_vars[1] = spi_get_id(spi);
    id->in_vars[2] = spi_get_id(spi);
 
    /* Create dither buffer descriptor set */
    id->nb_dither_bufs = 0;
    for (int n = 0; n < ops->num_ops; n++) {
        const SwsOp *op = &ops->ops[n];
        if (op->op != SWS_OP_DITHER)
            continue;
 
        id->dither[id->nb_dither_bufs].size = 1 << op->dither.size_log2;
        id->dither[id->nb_dither_bufs].arr_1d_id = spi_get_id(spi);
        id->dither[id->nb_dither_bufs].arr_2d_id = spi_get_id(spi);
        id->dither[id->nb_dither_bufs].struct_id = spi_get_id(spi);
        id->dither[id->nb_dither_bufs].id = spi_get_id(spi);
        id->in_vars[3 + id->nb_dither_bufs] = id->dither[id->nb_dither_bufs].id;
 
        desc_set[id->nb_dither_bufs++] = (FFVulkanDescriptorSetBinding) {
            .type        = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
            .stages      = VK_SHADER_STAGE_COMPUTE_BIT,
        };
    }
    if (id->nb_dither_bufs)
        ff_vk_shader_add_descriptor_set(&s->vkctx, shd, desc_set,
                                        id->nb_dither_bufs, 1, 0);
 
    /* Define shader header sections */
    define_shader_header(shd, ops, spi, id);
    define_shader_consts(ops, spi, id);
    define_shader_bindings(ops, spi, id, in_img_count, out_img_count);
 
    /* Main function starts here */
    spi_OpFunction(spi, id->ep, id->void_type, 0, id->void_fn_type);
    spi_OpLabel(spi, spi_get_id(spi));
 
    /* Load input image handles */
    int in_img[4] = { 0 };
    for (int i = 0; i < in_img_count; i++) {
        /* Deref array and then the pointer */
        int img = spi_OpAccessChain(spi, id->in_img_sptr,
                                    id->in_vars[1], id->u32_cid[i]);
        in_img[i] = spi_OpLoad(spi, id->in_img_type, img,
                               SpvMemoryAccessMaskNone, 0);
    }
 
    /* Load output image handles */
    int out_img[4];
    for (int i = 0; i < out_img_count; i++) {
        int img = spi_OpAccessChain(spi, id->out_img_sptr,
                                    id->in_vars[2], id->u32_cid[i]);
        out_img[i] = spi_OpLoad(spi, id->out_img_type, img,
                                SpvMemoryAccessMaskNone, 0);
    }
 
    /* Load gl_GlobalInvocationID */
    int gid = spi_OpLoad(spi, id->u32vec3_type, id->in_vars[0],
                         SpvMemoryAccessMaskNone, 0);
 
    /* ivec2(gl_GlobalInvocationID.xy) */
    gid = spi_OpVectorShuffle(spi, id->u32vec2_type, gid, gid, 0, 1);
    int gi2 = spi_OpBitcast(spi, id->i32vec2_type, gid);
 
    /* imageSize(out_img[0]); */
    int img1_s = spi_OpImageQuerySize(spi, id->i32vec2_type, out_img[0]);
    int scmp = spi_OpSGreaterThanEqual(spi, id->bvec2_type, gi2, img1_s);
    scmp = spi_OpAny(spi, id->b_type, scmp);
 
    /* if (out of bounds) return */
    int quit_label = spi_get_id(spi), merge_label = spi_get_id(spi);
    spi_OpSelectionMerge(spi, merge_label, SpvSelectionControlMaskNone);
    spi_OpBranchConditional(spi, scmp, quit_label, merge_label, 0);
 
    spi_OpLabel(spi, quit_label);
    spi_OpReturn(spi); /* Quit if out of bounds here */
    spi_OpLabel(spi, merge_label);
 
    /* Initialize main data state */
    int data;
    if (ops->ops[0].type == SWS_PIXEL_F32)
        data = spi_OpCompositeConstruct(spi, id->f32vec4_type,
                                        id->f32_p, id->f32_p,
                                        id->f32_p, id->f32_p);
    else
        data = spi_OpCompositeConstruct(spi, id->u32vec4_type,
                                        id->u32_p, id->u32_p,
                                        id->u32_p, id->u32_p);
 
    /* Keep track of which constant/buffer to use */
    int nb_const_ids = 0;
    int nb_dither_bufs = 0;
    int nb_linear_ops = 0;
 
    /* Operations */
    for (int n = 0; n < ops->num_ops; n++) {
        const SwsOp *op = &ops->ops[n];
        SwsPixelType cur_type = op->op == SWS_OP_CONVERT ?
                                op->convert.to : op->type;
        int type_v = cur_type == SWS_PIXEL_F32 ?
                     id->f32vec4_type : id->u32vec4_type;
        int type_s = cur_type == SWS_PIXEL_F32 ?
                     id->f32_type : id->u32_type;
        int uid = cur_type == SWS_PIXEL_F32 ?
                  id->f32_p : id->u32_p;
 
        switch (op->op) {
        case SWS_OP_READ:
            if (op->rw.frac || op->rw.filter) {
                return AVERROR(ENOTSUP);
            } else if (op->rw.packed) {
                data = spi_OpImageRead(spi, type_v, in_img[ops->plane_src[0]],
                                       gid, SpvImageOperandsMaskNone);
            } else {
                int tmp[4] = { uid, uid, uid, uid };
                for (int i = 0; i < op->rw.elems; i++) {
                    tmp[i] = spi_OpImageRead(spi, type_v,
                                             in_img[ops->plane_src[i]], gid,
                                             SpvImageOperandsMaskNone);
                    tmp[i] = spi_OpCompositeExtract(spi, type_s, tmp[i], 0);
                }
                data = spi_OpCompositeConstruct(spi, type_v,
                                                tmp[0], tmp[1], tmp[2], tmp[3]);
            }
            break;
        case SWS_OP_WRITE:
            if (op->rw.frac || op->rw.filter) {
                return AVERROR(ENOTSUP);
            } else if (op->rw.packed) {
                spi_OpImageWrite(spi, out_img[ops->plane_dst[0]], gid, data,
                                 SpvImageOperandsMaskNone);
            } else {
                for (int i = 0; i < op->rw.elems; i++) {
                    int tmp = spi_OpCompositeExtract(spi, type_s, data, i);
                    tmp = spi_OpCompositeConstruct(spi, type_v, tmp, tmp, tmp, tmp);
                    spi_OpImageWrite(spi, out_img[ops->plane_dst[i]], gid, tmp,
                                     SpvImageOperandsMaskNone);
                }
            }
            break;
        case SWS_OP_CLEAR:
            for (int i = 0; i < 4; i++) {
                if (!op->clear.value[i].den)
                    continue;
                data = spi_OpCompositeInsert(spi, type_v,
                                             id->const_ids[nb_const_ids++],
                                             data, i);
            }
            break;
        case SWS_OP_SWIZZLE:
            data = spi_OpVectorShuffle(spi, type_v, data, data,
                                       op->swizzle.in[0],
                                       op->swizzle.in[1],
                                       op->swizzle.in[2],
                                       op->swizzle.in[3]);
            break;
        case SWS_OP_CONVERT:
            if (ff_sws_pixel_type_is_int(cur_type) && op->convert.expand)
                data = spi_OpIMul(spi, type_v, data, id->const_ids[nb_const_ids++]);
            else if (op->type == SWS_PIXEL_F32 && type_s == id->u32_type)
                data = spi_OpConvertFToU(spi, type_v, data);
            else if (op->type != SWS_PIXEL_F32 && type_s == id->f32_type)
                data = spi_OpConvertUToF(spi, type_v, data);
            break;
        case SWS_OP_LSHIFT:
            data = spi_OpShiftLeftLogical(spi, type_v, data,
                                          id->const_ids[nb_const_ids++]);
            break;
        case SWS_OP_RSHIFT:
            data = spi_OpShiftRightLogical(spi, type_v, data,
                                           id->const_ids[nb_const_ids++]);
            break;
        case SWS_OP_SCALE:
            if (op->type == SWS_PIXEL_F32)
                data = spi_OpFMul(spi, type_v, data,
                                  id->const_ids[nb_const_ids++]);
            else
                data = spi_OpIMul(spi, type_v, data,
                                  id->const_ids[nb_const_ids++]);
            break;
        case SWS_OP_MIN:
        case SWS_OP_MAX: {
            int t = op->type == SWS_PIXEL_F32 ?
                    op->op == SWS_OP_MIN ? GLSLstd450FMin : GLSLstd450FMax :
                    op->op == SWS_OP_MIN ? GLSLstd450UMin : GLSLstd450UMax;
            for (int i = 0; i < 4; i++) {
                if (!op->clamp.limit[i].den)
                    continue;
                int tmp = spi_OpCompositeExtract(spi, type_s, data, i);
                tmp = spi_OpExtInst(spi, type_s, id->glfn, t,
                                    tmp, id->const_ids[nb_const_ids++]);
                data = spi_OpCompositeInsert(spi, type_v, tmp, data, i);
            }
            break;
        }
        case SWS_OP_DITHER: {
            int did = nb_dither_bufs++;
            int x_id = spi_OpCompositeExtract(spi, id->u32_type, gid, 0);
            int y_pos = spi_OpCompositeExtract(spi, id->u32_type, gid, 1);
            x_id = spi_OpBitwiseAnd(spi, id->u32_type, x_id,
                                    id->dither[did].mask_id);
            for (int i = 0; i < 4; i++) {
                if (op->dither.y_offset[i] < 0)
                    continue;
 
                int y_id = spi_OpIAdd(spi, id->u32_type, y_pos,
                                      id->const_ids[nb_const_ids++]);
                y_id = spi_OpBitwiseAnd(spi, id->u32_type, y_id,
                                        id->dither[did].mask_id);
 
                int ptr = spi_OpAccessChain(spi, id->dither_ptr_elem_id,
                                            id->dither[did].id, id->u32_cid[0],
                                            y_id, x_id);
                int val = spi_OpLoad(spi, id->f32_type, ptr,
                                     SpvMemoryAccessMaskNone, 0);
 
                int tmp = spi_OpCompositeExtract(spi, type_s, data, i);
                tmp = spi_OpFAdd(spi, type_s, tmp, val);
                data = spi_OpCompositeInsert(spi, type_v, tmp, data, i);
            }
            break;
        }
        case SWS_OP_LINEAR: {
            int tmp[4];
            tmp[0] = spi_OpCompositeExtract(spi, type_s, data, 0);
            tmp[1] = spi_OpCompositeExtract(spi, type_s, data, 1);
            tmp[2] = spi_OpCompositeExtract(spi, type_s, data, 2);
            tmp[3] = spi_OpCompositeExtract(spi, type_s, data, 3);
 
            int off = spi_reserve(spi, 0); /* Current offset */
            spi->off = id->linear_deco_off[nb_linear_ops];
            for (int i = 0; i < id->linear_deco_ops[nb_linear_ops]; i++)
                spi_OpDecorate(spi, spi->id + i, SpvDecorationNoContraction);
            spi->off = off;
 
            int res[4];
            for (int j = 0; j < 4; j++) {
                res[j] = op->type == SWS_PIXEL_F32 ? id->f32_0 : id->u32_cid[0];
                if (op->lin.m[j][0].num)
                    res[j] = spi_OpFMul(spi, type_s, tmp[0],
                                        id->const_ids[nb_const_ids++]);
 
                if (op->lin.m[j][0].num && op->lin.m[j][4].num)
                    res[j] = spi_OpFAdd(spi, type_s,
                                        id->const_ids[nb_const_ids++], res[j]);
                else if (op->lin.m[j][4].num)
                    res[j] = id->const_ids[nb_const_ids++];
 
                for (int i = 1; i < 4; i++) {
                    if (!op->lin.m[j][i].num)
                        continue;
 
                    int v = spi_OpFMul(spi, type_s, tmp[i],
                                       id->const_ids[nb_const_ids++]);
                    if (op->lin.m[j][0].num || op->lin.m[j][4].num)
                        res[j] = spi_OpFAdd(spi, type_s, res[j], v);
                    else
                        res[j] = v;
                }
            }
            data = spi_OpCompositeConstruct(spi, type_v,
                                            res[0], res[1], res[2], res[3]);
            nb_linear_ops++;
            break;
        }
        default:
            return AVERROR(ENOTSUP);
        }
    }
 
    /* Return and finalize */
    spi_OpReturn(spi);
    spi_OpFunctionEnd(spi);
 
    int len = spi_end(spi);
    if (len < 0)
        return AVERROR_INVALIDDATA;
 
    return ff_vk_shader_link(&s->vkctx, shd, spvbuf, len, "main");
}
#endif
 
#if CONFIG_LIBSHADERC || CONFIG_LIBGLSLANG
static void add_desc_read_write(FFVulkanDescriptorSetBinding *out_desc,
                                enum FFVkShaderRepFormat *out_rep,
                                const SwsOp *op)
{
    const char *img_type = op->type == SWS_PIXEL_F32 ? "rgba32f"  :
                           op->type == SWS_PIXEL_U32 ? "rgba32ui" :
                           op->type == SWS_PIXEL_U16 ? "rgba16ui" :
                                                       "rgba8ui";
 
    *out_desc = (FFVulkanDescriptorSetBinding) {
        .name = op->op == SWS_OP_WRITE ? "dst_img" : "src_img",
        .type = VK_DESCRIPTOR_TYPE_STORAGE_IMAGE,
        .mem_layout = img_type,
        .mem_quali = op->op == SWS_OP_WRITE ? "writeonly" : "readonly",
        .dimensions = 2,
        .elems = 4,
        .stages = VK_SHADER_STAGE_COMPUTE_BIT,
    };
 
    *out_rep = op->type == SWS_PIXEL_F32 ? FF_VK_REP_FLOAT : FF_VK_REP_UINT;
}
 
#define QSTR "(%i/%i%s)"
#define QTYPE(Q) (Q).num, (Q).den, cur_type == SWS_PIXEL_F32 ? ".0f" : ""
 
static int add_ops_glsl(VulkanPriv *p, FFVulkanOpsCtx *s,
                        SwsOpList *ops, FFVulkanShader *shd)
{
    int err;
    uint8_t *spv_data;
    size_t spv_len;
    void *spv_opaque = NULL;
 
    /* Interlaced formats are not currently supported */
    if (ops->src.interlaced || ops->dst.interlaced)
        return AVERROR(ENOTSUP);
 
    err = ff_vk_shader_init(&s->vkctx, shd, "sws_pass",
                            VK_SHADER_STAGE_COMPUTE_BIT,
                            NULL, 0, 32, 32, 1, 0);
    if (err < 0)
        return err;
 
    int nb_desc = 0;
    FFVulkanDescriptorSetBinding buf_desc[8];
 
    const SwsOp *read  = ff_sws_op_list_input(ops);
    const SwsOp *write = ff_sws_op_list_output(ops);
    if (read)
        add_desc_read_write(&buf_desc[nb_desc++], &p->src_rep, read);
    add_desc_read_write(&buf_desc[nb_desc++], &p->dst_rep, write);
    ff_vk_shader_add_descriptor_set(&s->vkctx, shd, buf_desc, nb_desc, 0, 0);
 
    err = create_dither_bufs(s, p, ops);
    if (err < 0)
        return err;
 
    nb_desc = 0;
    char dither_buf_name[MAX_DITHER_BUFS][64];
    char dither_mat_name[MAX_DITHER_BUFS][64];
    for (int n = 0; n < ops->num_ops; n++) {
        const SwsOp *op = &ops->ops[n];
        if (op->op != SWS_OP_DITHER)
            continue;
        int size = (1 << op->dither.size_log2);
        av_assert0(size < 8192);
        snprintf(dither_buf_name[nb_desc], 64, "dither_buf%i", n);
        snprintf(dither_mat_name[nb_desc], 64, "float dither_mat%i[%i][%i];",
                 n, size, size);
        buf_desc[nb_desc] = (FFVulkanDescriptorSetBinding) {
            .name        = dither_buf_name[nb_desc],
            .type        = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
            .stages      = VK_SHADER_STAGE_COMPUTE_BIT,
            .mem_layout  = "scalar",
            .buf_content = dither_mat_name[nb_desc],
        };
        nb_desc++;
    }
    if (nb_desc)
        ff_vk_shader_add_descriptor_set(&s->vkctx, shd, buf_desc,
                                        nb_desc, 1, 0);
 
    GLSLC(0, void main()                                                      );
    GLSLC(0, {                                                                );
    GLSLC(1,     ivec2 pos = ivec2(gl_GlobalInvocationID.xy);                 );
    GLSLC(1,     ivec2 size = imageSize(src_img[0]);                          );
    GLSLC(1,     if (any(greaterThanEqual(pos, size)))                        );
    GLSLC(2,         return;                                                  );
    GLSLC(0,                                                                  );
    GLSLC(1,     u8vec4 u8;                                                   );
    GLSLC(1,     u16vec4 u16;                                                 );
    GLSLC(1,     u32vec4 u32;                                                 );
    GLSLC(1,     precise f32vec4 f32;                                         );
    GLSLC(1,     precise f32vec4 tmp;                                         );
    GLSLC(0,                                                                  );
 
    for (int n = 0; n < ops->num_ops; n++) {
        const SwsOp *op = &ops->ops[n];
        SwsPixelType cur_type = op->op == SWS_OP_CONVERT ? op->convert.to :
                                op->type;
        const char *type_name = ff_sws_pixel_type_name(cur_type);
        const char *type_v = cur_type == SWS_PIXEL_F32 ? "f32vec4" :
                             cur_type == SWS_PIXEL_U32 ? "u32vec4" :
                             cur_type == SWS_PIXEL_U16 ? "u16vec4" : "u8vec4";
        const char *type_s = cur_type == SWS_PIXEL_F32 ? "float" :
                             cur_type == SWS_PIXEL_U32 ? "uint32_t" :
                             cur_type == SWS_PIXEL_U16 ? "uint16_t" : "uint8_t";
        av_bprintf(&shd->src, "    // %s\n", ff_sws_op_type_name(op->op));
 
        switch (op->op) {
        case SWS_OP_READ: {
            if (op->rw.frac || op->rw.filter) {
                return AVERROR(ENOTSUP);
            } else if (op->rw.packed) {
                GLSLF(1, %s = %s(imageLoad(src_img[%i], pos));                 ,
                      type_name, type_v, ops->plane_src[0]);
            } else {
                for (int i = 0; i < op->rw.elems; i++)
                    GLSLF(1, %s.%c = %s(imageLoad(src_img[%i], pos)[0]);       ,
                          type_name, "xyzw"[i], type_s, ops->plane_src[i]);
            }
            break;
        }
        case SWS_OP_WRITE: {
            if (op->rw.frac || op->rw.filter) {
                return AVERROR(ENOTSUP);
            } else if (op->rw.packed) {
                GLSLF(1, imageStore(dst_img[%i], pos, %s(%s));                  ,
                      ops->plane_dst[0], type_v, type_name);
            } else {
                for (int i = 0; i < op->rw.elems; i++)
                    GLSLF(1, imageStore(dst_img[%i], pos, %s(%s[%i]));         ,
                          ops->plane_dst[i], type_v, type_name, i);
            }
            break;
        }
        case SWS_OP_SWIZZLE: {
            av_bprintf(&shd->src, "    %s = %s.", type_name, type_name);
            for (int i = 0; i < 4; i++)
                av_bprintf(&shd->src, "%c", "xyzw"[op->swizzle.in[i]]);
            av_bprintf(&shd->src, ";\n");
            break;
        }
        case SWS_OP_CLEAR: {
            for (int i = 0; i < 4; i++) {
                if (!op->clear.value[i].den)
                    continue;
                av_bprintf(&shd->src, "    %s.%c = %s"QSTR";\n", type_name,
                           "xyzw"[i], type_s, QTYPE(op->clear.value[i]));
            }
            break;
        }
        case SWS_OP_SCALE:
            av_bprintf(&shd->src, "    %s = %s * "QSTR";\n",
                       type_name, type_name, QTYPE(op->scale.factor));
            break;
        case SWS_OP_MIN:
        case SWS_OP_MAX:
            for (int i = 0; i < 4; i++) {
                if (!op->clamp.limit[i].den)
                    continue;
                av_bprintf(&shd->src, "    %s.%c = %s(%s.%c, "QSTR");\n",
                           type_name, "xyzw"[i],
                           op->op == SWS_OP_MIN ? "min" : "max",
                           type_name, "xyzw"[i], QTYPE(op->clamp.limit[i]));
            }
            break;
        case SWS_OP_LSHIFT:
        case SWS_OP_RSHIFT:
            av_bprintf(&shd->src, "    %s %s= %i;\n", type_name,
                       op->op == SWS_OP_LSHIFT ? "<<" : ">>", op->shift.amount);
            break;
        case SWS_OP_CONVERT:
            if (ff_sws_pixel_type_is_int(cur_type) && op->convert.expand) {
                const AVRational sc = ff_sws_pixel_expand(op->type, op->convert.to);
                av_bprintf(&shd->src, "    %s = %s((%s*%i)/%i);\n",
                           type_name, type_v, ff_sws_pixel_type_name(op->type),
                           sc.num, sc.den);
            } else {
                av_bprintf(&shd->src, "    %s = %s(%s);\n",
                           type_name, type_v, ff_sws_pixel_type_name(op->type));
            }
            break;
        case SWS_OP_DITHER: {
            int size = (1 << op->dither.size_log2);
            for (int i = 0; i < 4; i++) {
                if (op->dither.y_offset[i] < 0)
                    continue;
                av_bprintf(&shd->src, "    %s.%c += dither_mat%i[(pos.y + %i) & %i]"
                                                                "[pos.x & %i];\n",
                           type_name, "xyzw"[i], n,
                           op->dither.y_offset[i], size - 1,
                           size - 1);
            }
            break;
        }
        case SWS_OP_LINEAR:
            for (int i = 0; i < 4; i++) {
                if (op->lin.m[i][4].num)
                    av_bprintf(&shd->src, "    tmp.%c = "QSTR";\n", "xyzw"[i],
                               QTYPE(op->lin.m[i][4]));
                else
                    av_bprintf(&shd->src, "    tmp.%c = 0;\n", "xyzw"[i]);
                for (int j = 0; j < 4; j++) {
                    if (!op->lin.m[i][j].num)
                        continue;
                    av_bprintf(&shd->src, "    tmp.%c += f32.%c*"QSTR";\n",
                               "xyzw"[i], "xyzw"[j], QTYPE(op->lin.m[i][j]));
                }
            }
            av_bprintf(&shd->src, "    f32 = tmp;\n");
            break;
        default:
            return AVERROR(ENOTSUP);
        }
    }
 
    GLSLC(0, }                                                                );
 
    err = s->spvc->compile_shader(&s->vkctx, s->spvc, shd,
                                  &spv_data, &spv_len, "main",
                                  &spv_opaque);
    if (err < 0)
        return err;
 
    err = ff_vk_shader_link(&s->vkctx, shd, spv_data, spv_len, "main");
 
    if (spv_opaque)
        s->spvc->free_shader(s->spvc, &spv_opaque);
 
    if (err < 0)
        return err;
 
    return 0;
}
#endif
 
static int compile(SwsContext *sws, SwsOpList *ops, SwsCompiledOp *out, int glsl)
{
    int err;
    SwsInternal *c = sws_internal(sws);
    FFVulkanOpsCtx *s = c->hw_priv;
    if (!s)
        return AVERROR(ENOTSUP);
 
    VulkanPriv *p = av_mallocz(sizeof(*p));
    if (!p)
        return AVERROR(ENOMEM);
    p->s = av_refstruct_ref(c->hw_priv);
 
    err = ff_vk_exec_pool_init(&s->vkctx, s->qf, &p->e, 1,
                               0, 0, 0, NULL);
    if (err < 0)
        goto fail;
 
    if (ops->src.format == AV_PIX_FMT_BGR0 ||
        ops->src.format == AV_PIX_FMT_BGRA ||
        ops->dst.format == AV_PIX_FMT_BGR0 ||
        ops->dst.format == AV_PIX_FMT_BGRA) {
        VkFormatProperties2 prop = {
            .sType = VK_STRUCTURE_TYPE_FORMAT_PROPERTIES_2,
        };
        FFVulkanFunctions *vk = &s->vkctx.vkfn;
        vk->GetPhysicalDeviceFormatProperties2(s->vkctx.hwctx->phys_dev,
                                               VK_FORMAT_B8G8R8A8_UNORM,
                                               &prop);
        if (!(prop.formatProperties.optimalTilingFeatures &
              VK_FORMAT_FEATURE_2_STORAGE_WRITE_WITHOUT_FORMAT_BIT)) {
            err = AVERROR(ENOTSUP);
            goto fail;
        }
    }
 
    if (glsl) {
        err = AVERROR(ENOTSUP);
#if CONFIG_LIBSHADERC || CONFIG_LIBGLSLANG
        err = add_ops_glsl(p, s, ops, &p->shd);
#endif
    } else {
        err = AVERROR(ENOTSUP);
#if HAVE_SPIRV_HEADERS_SPIRV_H || HAVE_SPIRV_UNIFIED1_SPIRV_H
        err = add_ops_spirv(p, s, ops, &p->shd);
#endif
    }
    if (err < 0)
        goto fail;
 
    err = ff_vk_shader_register_exec(&s->vkctx, &p->e, &p->shd);
    if (err < 0)
        goto fail;
 
    for (int i = 0; i < p->nb_dither_buf; i++)
        ff_vk_shader_update_desc_buffer(&s->vkctx, &p->e.contexts[0], &p->shd,
                                        1, i, 0, &p->dither_buf[i],
                                        0, VK_WHOLE_SIZE, VK_FORMAT_UNDEFINED);
 
    *out = (SwsCompiledOp) {
        .opaque      = true,
        .func_opaque = process,
        .priv        = p,
        .free        = free_fn,
    };
 
    return 0;
 
fail:
    free_fn(p);
    return err;
}
 
#if HAVE_SPIRV_HEADERS_SPIRV_H || HAVE_SPIRV_UNIFIED1_SPIRV_H
static int compile_spirv(SwsContext *sws, SwsOpList *ops, SwsCompiledOp *out)
{
    return compile(sws, ops, out, 0);
}
 
const SwsOpBackend backend_spirv = {
    .name      = "spirv",
    .compile   = compile_spirv,
    .hw_format = AV_PIX_FMT_VULKAN,
};
#endif
 
#if CONFIG_LIBSHADERC || CONFIG_LIBGLSLANG
static int compile_glsl(SwsContext *sws, SwsOpList *ops, SwsCompiledOp *out)
{
    return compile(sws, ops, out, 1);
}
 
const SwsOpBackend backend_glsl = {
    .name      = "glsl",
    .compile   = compile_glsl,
    .hw_format = AV_PIX_FMT_VULKAN,
};
#endif