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/*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MP_GL_USER_SHADERS_H
#define MP_GL_USER_SHADERS_H
#include "common.h"
#include "utils.h"
#define SHADER_API 1
#define SHADER_MAX_HOOKS 64
#define SHADER_MAX_BINDS 6
#define MAX_SZEXP_SIZE 32
enum szexp_op {
SZEXP_OP_ADD,
SZEXP_OP_SUB,
SZEXP_OP_MUL,
SZEXP_OP_DIV,
SZEXP_OP_NOT,
SZEXP_OP_GT,
SZEXP_OP_LT,
};
enum szexp_tag {
SZEXP_END = 0, // End of an RPN expression
SZEXP_CONST, // Push a constant value onto the stack
SZEXP_VAR_W, // Get the width/height of a named texture (variable)
SZEXP_VAR_H,
SZEXP_OP2, // Pop two elements and push the result of a dyadic operation
SZEXP_OP1, // Pop one element and push the result of a monadic operation
};
struct szexp {
enum szexp_tag tag;
union {
float cval;
struct bstr varname;
enum szexp_op op;
} val;
};
struct gl_user_shader {
struct bstr hook_tex[SHADER_MAX_HOOKS];
struct bstr bind_tex[SHADER_MAX_BINDS];
struct bstr save_tex;
struct bstr pass_body;
struct gl_transform offset;
struct szexp width[MAX_SZEXP_SIZE];
struct szexp height[MAX_SZEXP_SIZE];
struct szexp cond[MAX_SZEXP_SIZE];
int components;
};
// Parse the next shader pass from 'body'. Returns false if the end of the
// string was reached
bool parse_user_shader_pass(struct mp_log *log, struct bstr *body,
struct gl_user_shader *out);
// Evaluate a szexp, given a lookup function for named textures
bool eval_szexpr(struct mp_log *log, void *priv,
bool (*lookup)(void *priv, struct bstr var, float size[2]),
struct szexp expr[MAX_SZEXP_SIZE], float *result);
#endif
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