1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#include <shaderc/shaderc.h>
20
21#include "mem.h"
22
23static int shdc_shader_compile(FFVkSPIRVCompiler *ctx, void *avctx,
24                               FFVkSPIRVShader *shd, uint8_t **data,
25                               size_t *size, const char *entrypoint,
26                               void **opaque)
27{
28    int loglevel, err, warn, ret;
29    const char *status, *message;
30    shaderc_compilation_result_t res;
31    static const char *shdc_result[] = {
32        [shaderc_compilation_status_success]            = "success",
33        [shaderc_compilation_status_invalid_stage]      = "invalid stage",
34        [shaderc_compilation_status_compilation_error]  = "error",
35        [shaderc_compilation_status_internal_error]     = "internal error",
36        [shaderc_compilation_status_null_result_object] = "no result",
37        [shaderc_compilation_status_invalid_assembly]   = "invalid assembly",
38    };
39    static const shaderc_shader_kind shdc_kind[] = {
40        [VK_SHADER_STAGE_VERTEX_BIT]   = shaderc_glsl_vertex_shader,
41        [VK_SHADER_STAGE_FRAGMENT_BIT] = shaderc_glsl_fragment_shader,
42        [VK_SHADER_STAGE_COMPUTE_BIT]  = shaderc_glsl_compute_shader,
43    };
44
45    shaderc_compile_options_t opts = shaderc_compile_options_initialize();
46    if (!opts)
47        return AVERROR(ENOMEM);
48
49    shaderc_compile_options_set_target_env(opts, shaderc_target_env_vulkan,
50                                           shaderc_env_version_vulkan_1_2);
51    shaderc_compile_options_set_target_spirv(opts, shaderc_spirv_version_1_5);
52    shaderc_compile_options_set_optimization_level(opts,
53                                                   shaderc_optimization_level_performance);
54
55    res = shaderc_compile_into_spv((shaderc_compiler_t)ctx->priv,
56                                   shd->src.str, strlen(shd->src.str),
57                                   shdc_kind[shd->shader.stage],
58                                   shd->name, entrypoint, opts);
59    shaderc_compile_options_release(opts);
60
61    ret = shaderc_result_get_compilation_status(res);
62    err = shaderc_result_get_num_errors(res);
63    warn = shaderc_result_get_num_warnings(res);
64    message = shaderc_result_get_error_message(res);
65
66    loglevel = err ? AV_LOG_ERROR : warn ? AV_LOG_WARNING : AV_LOG_VERBOSE;
67
68    ff_vk_print_shader(avctx, shd, loglevel);
69    if (message && (err || warn))
70        av_log(avctx, loglevel, "%s\n", message);
71    status = ret < FF_ARRAY_ELEMS(shdc_result) ? shdc_result[ret] : "unknown";
72    av_log(avctx, loglevel, "shaderc compile status '%s' (%d errors, %d warnings)\n",
73           status, err, warn);
74
75    if (err > 0)
76        return AVERROR(EINVAL);
77
78    *data = (uint8_t *)shaderc_result_get_bytes(res);
79    *size = shaderc_result_get_length(res);
80    *opaque = res;
81
82    return 0;
83}
84
85static void shdc_shader_free(FFVkSPIRVCompiler *ctx, void **opaque)
86{
87    if (!opaque || !*opaque)
88        return;
89
90    shaderc_result_release((shaderc_compilation_result_t)*opaque);
91    *opaque = NULL;
92}
93
94static void shdc_uninit(FFVkSPIRVCompiler **ctx)
95{
96    FFVkSPIRVCompiler *s;
97
98    if (!ctx || !*ctx)
99        return;
100
101    s = *ctx;
102
103    shaderc_compiler_release((shaderc_compiler_t)s->priv);
104    av_freep(ctx);
105}
106
107static FFVkSPIRVCompiler *ff_vk_shaderc_init(void)
108{
109    FFVkSPIRVCompiler *ret = av_mallocz(sizeof(*ret));
110    if (!ret)
111        return NULL;
112
113    ret->compile_shader = shdc_shader_compile;
114    ret->free_shader    = shdc_shader_free;
115    ret->uninit         = shdc_uninit;
116
117    ret->priv           = (void *)shaderc_compiler_initialize();
118    if (!ret->priv)
119        av_freep(&ret);
120
121    return ret;
122}
123