/*
  * 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/random_seed.h"

 #include "libavutil/opt.h"
 #include "vulkan.h"
 #include "internal.h"
 
 #define CGROUPS (int [3]){ 32, 32, 1 }
 
 typedef struct ChromaticAberrationVulkanContext {
     VulkanFilterContext vkctx;
 
     int initialized;
     FFVkExecContext *exec;
     VulkanPipeline *pl;
 
     /* Shader updators, must be in the main filter struct */
     VkDescriptorImageInfo input_images[3];
     VkDescriptorImageInfo output_images[3];
 
     /* Push constants / options */
     struct {
         float dist[2];
     } opts;
 } ChromaticAberrationVulkanContext;
 
 static const char distort_chroma_kernel[] = {
     C(0, void distort_rgb(ivec2 size, ivec2 pos)                               )
     C(0, {                                                                     )
     C(1,     const vec2 p = ((vec2(pos)/vec2(size)) - 0.5f)*2.0f;              )
     C(1,     const vec2 o = p * (dist - 1.0f);                                 )
     C(0,                                                                       )
     C(1,     vec4 res;                                                         )
     C(1,     res.r = texture(input_img[0], ((p - o)/2.0f) + 0.5f).r;           )
     C(1,     res.g = texture(input_img[0], ((p    )/2.0f) + 0.5f).g;           )
     C(1,     res.b = texture(input_img[0], ((p + o)/2.0f) + 0.5f).b;           )
     C(1,     res.a = texture(input_img[0], ((p    )/2.0f) + 0.5f).a;           )
     C(1,     imageStore(output_img[0], pos, res);                              )
     C(0, }                                                                     )
     C(0,                                                                       )
     C(0, void distort_chroma(int idx, ivec2 size, ivec2 pos)                   )
     C(0, {                                                                     )
     C(1,     vec2 p = ((vec2(pos)/vec2(size)) - 0.5f)*2.0f;                    )
     C(1,     float d = sqrt(p.x*p.x + p.y*p.y);                                )
     C(1,     p *= d / (d*     dist);                                           )
     C(1,     vec4 res = texture(input_img[idx], (p/2.0f) + 0.5f);              )
     C(1,     imageStore(output_img[idx], pos, res);                            )
     C(0, }                                                                     )
 };
 
 static av_cold int init_filter(AVFilterContext *ctx, AVFrame *in)
 {
     int err;
     ChromaticAberrationVulkanContext *s = ctx->priv;
 
     /* Create a sampler */
     VkSampler *sampler = ff_vk_init_sampler(ctx, 0, VK_FILTER_LINEAR);
     if (!sampler)
         return AVERROR_EXTERNAL;
 

     s->vkctx.queue_family_idx = s->vkctx.hwctx->queue_family_comp_index;
     s->vkctx.queue_count = GET_QUEUE_COUNT(s->vkctx.hwctx, 0, 1, 0);

     s->vkctx.cur_queue_idx = av_get_random_seed() % s->vkctx.queue_count;

     s->pl = ff_vk_create_pipeline(ctx);
     if (!s->pl)
         return AVERROR(ENOMEM);
 
     /* Normalize options */
     s->opts.dist[0] = (s->opts.dist[0] / 100.0f) + 1.0f;
     s->opts.dist[1] = (s->opts.dist[1] / 100.0f) + 1.0f;
 
     { /* Create the shader */
         const int planes = av_pix_fmt_count_planes(s->vkctx.output_format);
         VulkanDescriptorSetBinding desc_i[2] = {
             {
                 .name       = "input_img",
                 .type       = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
                 .dimensions = 2,
                 .elems      = planes,
                 .stages     = VK_SHADER_STAGE_COMPUTE_BIT,
                 .updater    = s->input_images,
                 .samplers   = DUP_SAMPLER_ARRAY4(*sampler),
             },
             {
                 .name       = "output_img",
                 .type       = VK_DESCRIPTOR_TYPE_STORAGE_IMAGE,
                 .mem_layout = ff_vk_shader_rep_fmt(s->vkctx.output_format),
                 .mem_quali  = "writeonly",
                 .dimensions = 2,
                 .elems      = planes,
                 .stages     = VK_SHADER_STAGE_COMPUTE_BIT,
                 .updater    = s->output_images,
             },
         };
 
         SPIRVShader *shd = ff_vk_init_shader(ctx, s->pl, "chromaber_compute",
                                              VK_SHADER_STAGE_COMPUTE_BIT);
         if (!shd)
             return AVERROR(ENOMEM);
 
         ff_vk_set_compute_shader_sizes(ctx, shd, CGROUPS);
 
         GLSLC(0, layout(push_constant, std430) uniform pushConstants {        );
         GLSLC(1,    vec2 dist;                                                );
         GLSLC(0, };                                                           );
         GLSLC(0,                                                              );
 
         ff_vk_add_push_constant(ctx, s->pl, 0, sizeof(s->opts),
                                 VK_SHADER_STAGE_COMPUTE_BIT);
 
         RET(ff_vk_add_descriptor_set(ctx, s->pl, shd, desc_i, 2, 0)); /* set 0 */
 
         GLSLD(   distort_chroma_kernel                                        );
         GLSLC(0, void main()                                                  );
         GLSLC(0, {                                                            );
         GLSLC(1,     ivec2 pos = ivec2(gl_GlobalInvocationID.xy);             );
         if (planes == 1) {
             GLSLC(1, distort_rgb(imageSize(output_img[0]), pos);              );
         } else {
             GLSLC(1, ivec2 size = imageSize(output_img[0]);                   );
             GLSLC(1, vec2 npos = vec2(pos)/vec2(size);                        );
             GLSLC(1, vec4 res = texture(input_img[0], npos);                  );
             GLSLC(1, imageStore(output_img[0], pos, res);                     );
             for (int i = 1; i < planes; i++) {
                 GLSLC(0,                                                      );
                 GLSLF(1,  size = imageSize(output_img[%i]);                 ,i);
                 GLSLC(1,  if (IS_WITHIN(pos, size)) {                         );
                 GLSLF(2,      distort_chroma(%i, size, pos);                ,i);
                 GLSLC(1,  } else {                                            );
                 GLSLC(2,    npos = vec2(pos)/vec2(size);                      );
                 GLSLF(2,    res = texture(input_img[%i], npos);             ,i);
                 GLSLF(2,    imageStore(output_img[%i], pos, res);           ,i);
                 GLSLC(1, }                                                    );
             }
         }
         GLSLC(0, }                                                            );
 
         RET(ff_vk_compile_shader(ctx, shd, "main"));
     }
 
     RET(ff_vk_init_pipeline_layout(ctx, s->pl));
     RET(ff_vk_init_compute_pipeline(ctx, s->pl));
 
     /* Execution context */

     RET(ff_vk_create_exec_ctx(ctx, &s->exec));

 
     s->initialized = 1;
 
     return 0;
 
 fail:
     return err;
 }
 
 static int process_frames(AVFilterContext *avctx, AVFrame *out_f, AVFrame *in_f)
 {
     int err = 0;

     VkCommandBuffer cmd_buf;

     ChromaticAberrationVulkanContext *s = avctx->priv;
     AVVkFrame *in = (AVVkFrame *)in_f->data[0];
     AVVkFrame *out = (AVVkFrame *)out_f->data[0];
     int planes = av_pix_fmt_count_planes(s->vkctx.output_format);
 

     /* Update descriptors and init the exec context */
     ff_vk_start_exec_recording(avctx, s->exec);
     cmd_buf = ff_vk_get_exec_buf(avctx, s->exec);
 

     for (int i = 0; i < planes; i++) {

         RET(ff_vk_create_imageview(avctx, s->exec, &s->input_images[i].imageView,
                                    in->img[i],

                                    av_vkfmt_from_pixfmt(s->vkctx.input_format)[i],
                                    ff_comp_identity_map));
 

         RET(ff_vk_create_imageview(avctx, s->exec, &s->output_images[i].imageView,
                                    out->img[i],

                                    av_vkfmt_from_pixfmt(s->vkctx.output_format)[i],
                                    ff_comp_identity_map));
 
         s->input_images[i].imageLayout  = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
         s->output_images[i].imageLayout = VK_IMAGE_LAYOUT_GENERAL;
     }
 
     ff_vk_update_descriptor_set(avctx, s->pl, 0);
 
     for (int i = 0; i < planes; i++) {
         VkImageMemoryBarrier bar[2] = {
             {
                 .sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER,
                 .srcAccessMask = 0,
                 .dstAccessMask = VK_ACCESS_SHADER_READ_BIT,
                 .oldLayout = in->layout[i],
                 .newLayout = s->input_images[i].imageLayout,
                 .srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
                 .dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
                 .image = in->img[i],
                 .subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT,
                 .subresourceRange.levelCount = 1,
                 .subresourceRange.layerCount = 1,
             },
             {
                 .sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER,
                 .srcAccessMask = 0,
                 .dstAccessMask = VK_ACCESS_SHADER_WRITE_BIT,
                 .oldLayout = out->layout[i],
                 .newLayout = s->output_images[i].imageLayout,
                 .srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
                 .dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
                 .image = out->img[i],
                 .subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT,
                 .subresourceRange.levelCount = 1,
                 .subresourceRange.layerCount = 1,
             },
         };
 

         vkCmdPipelineBarrier(cmd_buf, VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,

                              VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT, 0,
                              0, NULL, 0, NULL, FF_ARRAY_ELEMS(bar), bar);
 
         in->layout[i]  = bar[0].newLayout;
         in->access[i]  = bar[0].dstAccessMask;
 
         out->layout[i] = bar[1].newLayout;
         out->access[i] = bar[1].dstAccessMask;
     }
 
     ff_vk_bind_pipeline_exec(avctx, s->exec, s->pl);
 
     ff_vk_update_push_exec(avctx, s->exec, VK_SHADER_STAGE_COMPUTE_BIT,
                            0, sizeof(s->opts), &s->opts);
 

     vkCmdDispatch(cmd_buf,

                   FFALIGN(s->vkctx.output_width,  CGROUPS[0])/CGROUPS[0],
                   FFALIGN(s->vkctx.output_height, CGROUPS[1])/CGROUPS[1], 1);
 
     ff_vk_add_exec_dep(avctx, s->exec, in_f, VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT);
     ff_vk_add_exec_dep(avctx, s->exec, out_f, VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT);
 
     err = ff_vk_submit_exec_queue(avctx, s->exec);
     if (err)
         return err;
 

     return err;

 
 fail:

     ff_vk_discard_exec_deps(avctx, s->exec);

     return err;
 }
 
 static int chromaber_vulkan_filter_frame(AVFilterLink *link, AVFrame *in)
 {
     int err;
     AVFilterContext *ctx = link->dst;
     ChromaticAberrationVulkanContext *s = ctx->priv;
     AVFilterLink *outlink = ctx->outputs[0];
 
     AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
     if (!out) {
         err = AVERROR(ENOMEM);
         goto fail;
     }
 
     if (!s->initialized)
         RET(init_filter(ctx, in));
 
     RET(process_frames(ctx, out, in));
 
     err = av_frame_copy_props(out, in);
     if (err < 0)
         goto fail;
 
     av_frame_free(&in);
 
     return ff_filter_frame(outlink, out);
 
 fail:
     av_frame_free(&in);
     av_frame_free(&out);
     return err;
 }
 
 static void chromaber_vulkan_uninit(AVFilterContext *avctx)
 {
     ChromaticAberrationVulkanContext *s = avctx->priv;
 
     ff_vk_filter_uninit(avctx);
 
     s->initialized = 0;
 }
 
 #define OFFSET(x) offsetof(ChromaticAberrationVulkanContext, x)
 #define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
 static const AVOption chromaber_vulkan_options[] = {
     { "dist_x", "Set horizontal distortion amount", OFFSET(opts.dist[0]), AV_OPT_TYPE_FLOAT, {.dbl = 0.0f}, -10.0f, 10.0f, .flags = FLAGS },
     { "dist_y", "Set vertical distortion amount",   OFFSET(opts.dist[1]), AV_OPT_TYPE_FLOAT, {.dbl = 0.0f}, -10.0f, 10.0f, .flags = FLAGS },
     { NULL },
 };
 
 AVFILTER_DEFINE_CLASS(chromaber_vulkan);
 
 static const AVFilterPad chromaber_vulkan_inputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_VIDEO,
         .filter_frame = &chromaber_vulkan_filter_frame,
         .config_props = &ff_vk_filter_config_input,
     },
     { NULL }
 };
 
 static const AVFilterPad chromaber_vulkan_outputs[] = {
     {
         .name = "default",
         .type = AVMEDIA_TYPE_VIDEO,
         .config_props = &ff_vk_filter_config_output,
     },
     { NULL }
 };
 
 AVFilter ff_vf_chromaber_vulkan = {
     .name           = "chromaber_vulkan",
     .description    = NULL_IF_CONFIG_SMALL("Offset chroma of input video (chromatic aberration)"),
     .priv_size      = sizeof(ChromaticAberrationVulkanContext),
     .init           = &ff_vk_filter_init,
     .uninit         = &chromaber_vulkan_uninit,
     .query_formats  = &ff_vk_filter_query_formats,
     .inputs         = chromaber_vulkan_inputs,
     .outputs        = chromaber_vulkan_outputs,
     .priv_class     = &chromaber_vulkan_class,
     .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
 };