mirror of https://github.com/mpv-player/mpv
107 lines
3.4 KiB
C
107 lines
3.4 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "user_shaders.h"
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// Returns false if no more shaders could be parsed
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bool parse_user_shader_pass(struct mp_log *log, struct bstr *body,
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struct gl_user_shader *out)
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{
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if (!body || !out || !body->start || body->len == 0)
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return false;
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*out = (struct gl_user_shader){ .transform = identity_trans };
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int hook_idx = 0;
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int bind_idx = 0;
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// First parse all the headers
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while (true) {
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struct bstr rest;
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struct bstr line = bstr_getline(*body, &rest);
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// Check for the presence of the magic line beginning
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if (!bstr_eatstart0(&line, "//!"))
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break;
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*body = rest;
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// Parse the supported commands
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if (bstr_eatstart0(&line, "HOOK")) {
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if (hook_idx == SHADER_MAX_HOOKS) {
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mp_err(log, "Passes may only hook up to %d textures!\n",
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SHADER_MAX_HOOKS);
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return false;
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}
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out->hook_tex[hook_idx++] = bstr_strip(line);
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continue;
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}
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if (bstr_eatstart0(&line, "BIND")) {
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if (bind_idx == SHADER_MAX_BINDS) {
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mp_err(log, "Passes may only bind up to %d textures!\n",
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SHADER_MAX_BINDS);
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return false;
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}
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out->bind_tex[bind_idx++] = bstr_strip(line);
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continue;
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}
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if (bstr_eatstart0(&line, "SAVE")) {
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out->save_tex = bstr_strip(line);
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continue;
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}
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if (bstr_eatstart0(&line, "TRANSFORM")) {
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float sx, sy, ox, oy;
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if (bstr_sscanf(line, "%f %f %f %f", &sx, &sy, &ox, &oy) != 4) {
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mp_err(log, "Error while parsing TRANSFORM!\n");
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return false;
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}
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out->transform = (struct gl_transform){{{sx, 0}, {0, sy}}, {ox, oy}};
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continue;
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}
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if (bstr_eatstart0(&line, "COMPONENTS")) {
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if (bstr_sscanf(line, "%d", &out->components) != 1) {
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mp_err(log, "Error while parsing COMPONENTS!\n");
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return false;
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}
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continue;
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}
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// Unknown command type
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char *str = bstrto0(NULL, line);
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mp_err(log, "Unrecognized command '%s'!\n", str);
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talloc_free(str);
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return false;
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}
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// The rest of the file up until the next magic line beginning (if any)
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// shall be the shader body
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if (bstr_split_tok(*body, "//!", &out->pass_body, body)) {
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// Make sure the magic line is part of the rest
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body->start -= 3;
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body->len += 3;
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}
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// Sanity checking
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if (hook_idx == 0)
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mp_warn(log, "Pass has no hooked textures (will be ignored)!\n");
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return true;
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}
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