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mpv/video/out/gpu/user_shaders.c

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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/>.
*/
#include <assert.h>
#include <math.h>
#include "common/msg.h"
#include "misc/ctype.h"
#include "user_shaders.h"
static bool parse_rpn_szexpr(struct bstr line, struct szexp out[MAX_SZEXP_SIZE])
{
int pos = 0;
while (line.len > 0) {
struct bstr word = bstr_strip(bstr_splitchar(line, &line, ' '));
if (word.len == 0)
continue;
if (pos >= MAX_SZEXP_SIZE)
return false;
struct szexp *exp = &out[pos++];
if (bstr_eatend0(&word, ".w") || bstr_eatend0(&word, ".width")) {
exp->tag = SZEXP_VAR_W;
exp->val.varname = word;
continue;
}
if (bstr_eatend0(&word, ".h") || bstr_eatend0(&word, ".height")) {
exp->tag = SZEXP_VAR_H;
exp->val.varname = word;
continue;
}
switch (word.start[0]) {
case '+': exp->tag = SZEXP_OP2; exp->val.op = SZEXP_OP_ADD; continue;
case '-': exp->tag = SZEXP_OP2; exp->val.op = SZEXP_OP_SUB; continue;
case '*': exp->tag = SZEXP_OP2; exp->val.op = SZEXP_OP_MUL; continue;
case '/': exp->tag = SZEXP_OP2; exp->val.op = SZEXP_OP_DIV; continue;
case '%': exp->tag = SZEXP_OP2; exp->val.op = SZEXP_OP_MOD; continue;
case '!': exp->tag = SZEXP_OP1; exp->val.op = SZEXP_OP_NOT; continue;
case '>': exp->tag = SZEXP_OP2; exp->val.op = SZEXP_OP_GT; continue;
case '<': exp->tag = SZEXP_OP2; exp->val.op = SZEXP_OP_LT; continue;
case '=': exp->tag = SZEXP_OP2; exp->val.op = SZEXP_OP_EQ; continue;
}
if (mp_isdigit(word.start[0])) {
exp->tag = SZEXP_CONST;
if (bstr_sscanf(word, "%f", &exp->val.cval) != 1)
return false;
continue;
}
// Some sort of illegal expression
return false;
}
return true;
}
// Returns whether successful. 'result' is left untouched on failure
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)
{
float stack[MAX_SZEXP_SIZE] = {0};
int idx = 0; // points to next element to push
for (int i = 0; i < MAX_SZEXP_SIZE; i++) {
switch (expr[i].tag) {
case SZEXP_END:
goto done;
case SZEXP_CONST:
// Since our SZEXPs are bound by MAX_SZEXP_SIZE, it should be
// impossible to overflow the stack
assert(idx < MAX_SZEXP_SIZE);
stack[idx++] = expr[i].val.cval;
continue;
case SZEXP_OP1:
if (idx < 1) {
mp_warn(log, "Stack underflow in RPN expression!\n");
return false;
}
switch (expr[i].val.op) {
case SZEXP_OP_NOT: stack[idx-1] = !stack[idx-1]; break;
default: MP_ASSERT_UNREACHABLE();
}
continue;
case SZEXP_OP2:
if (idx < 2) {
mp_warn(log, "Stack underflow in RPN expression!\n");
return false;
}
// Pop the operands in reverse order
float op2 = stack[--idx];
float op1 = stack[--idx];
float res = 0.0;
switch (expr[i].val.op) {
case SZEXP_OP_ADD: res = op1 + op2; break;
case SZEXP_OP_SUB: res = op1 - op2; break;
case SZEXP_OP_MUL: res = op1 * op2; break;
case SZEXP_OP_DIV: res = op1 / op2; break;
case SZEXP_OP_MOD: res = fmodf(op1, op2); break;
case SZEXP_OP_GT: res = op1 > op2; break;
case SZEXP_OP_LT: res = op1 < op2; break;
case SZEXP_OP_EQ: res = op1 == op2; break;
default: MP_ASSERT_UNREACHABLE();
}
if (!isfinite(res)) {
mp_warn(log, "Illegal operation in RPN expression!\n");
return false;
}
stack[idx++] = res;
continue;
case SZEXP_VAR_W:
case SZEXP_VAR_H: {
struct bstr name = expr[i].val.varname;
float size[2];
if (!lookup(priv, name, size)) {
mp_warn(log, "Variable %.*s not found in RPN expression!\n",
BSTR_P(name));
return false;
}
stack[idx++] = (expr[i].tag == SZEXP_VAR_W) ? size[0] : size[1];
continue;
}
}
}
done:
// Return the single stack element
if (idx != 1) {
mp_warn(log, "Malformed stack after RPN expression!\n");
return false;
}
*result = stack[0];
return true;
}
static bool parse_hook(struct mp_log *log, struct bstr *body,
struct gl_user_shader_hook *out)
{
*out = (struct gl_user_shader_hook){
.pass_desc = bstr0("(unknown)"),
.offset = identity_trans,
.align_offset = false,
.width = {{ SZEXP_VAR_W, { .varname = bstr0("HOOKED") }}},
.height = {{ SZEXP_VAR_H, { .varname = bstr0("HOOKED") }}},
.cond = {{ SZEXP_CONST, { .cval = 1.0 }}},
};
int hook_idx = 0;
int bind_idx = 0;
// Parse all headers
while (true) {
struct bstr rest;
struct bstr line = bstr_strip(bstr_getline(*body, &rest));
// Check for the presence of the magic line beginning
if (!bstr_eatstart0(&line, "//!"))
break;
*body = rest;
// Parse the supported commands
if (bstr_eatstart0(&line, "HOOK")) {
if (hook_idx == SHADER_MAX_HOOKS) {
mp_err(log, "Passes may only hook up to %d textures!\n",
SHADER_MAX_HOOKS);
return false;
}
out->hook_tex[hook_idx++] = bstr_strip(line);
continue;
}
if (bstr_eatstart0(&line, "BIND")) {
if (bind_idx == SHADER_MAX_BINDS) {
mp_err(log, "Passes may only bind up to %d textures!\n",
SHADER_MAX_BINDS);
return false;
}
out->bind_tex[bind_idx++] = bstr_strip(line);
continue;
}
if (bstr_eatstart0(&line, "SAVE")) {
out->save_tex = bstr_strip(line);
continue;
}
if (bstr_eatstart0(&line, "DESC")) {
out->pass_desc = bstr_strip(line);
continue;
}
if (bstr_eatstart0(&line, "OFFSET")) {
line = bstr_strip(line);
if (bstr_equals0(line, "ALIGN")) {
out->align_offset = true;
} else {
float ox, oy;
if (bstr_sscanf(line, "%f %f", &ox, &oy) != 2) {
mp_err(log, "Error while parsing OFFSET!\n");
return false;
}
out->offset.t[0] = ox;
out->offset.t[1] = oy;
}
continue;
}
if (bstr_eatstart0(&line, "WIDTH")) {
if (!parse_rpn_szexpr(line, out->width)) {
mp_err(log, "Error while parsing WIDTH!\n");
return false;
}
continue;
}
if (bstr_eatstart0(&line, "HEIGHT")) {
if (!parse_rpn_szexpr(line, out->height)) {
mp_err(log, "Error while parsing HEIGHT!\n");
return false;
}
continue;
}
if (bstr_eatstart0(&line, "WHEN")) {
if (!parse_rpn_szexpr(line, out->cond)) {
mp_err(log, "Error while parsing WHEN!\n");
return false;
}
continue;
}
if (bstr_eatstart0(&line, "COMPONENTS")) {
if (bstr_sscanf(line, "%d", &out->components) != 1) {
mp_err(log, "Error while parsing COMPONENTS!\n");
return false;
}
continue;
}
if (bstr_eatstart0(&line, "COMPUTE")) {
struct compute_info *ci = &out->compute;
int num = bstr_sscanf(line, "%d %d %d %d", &ci->block_w, &ci->block_h,
&ci->threads_w, &ci->threads_h);
if (num == 2 || num == 4) {
ci->active = true;
ci->directly_writes = true;
} else {
mp_err(log, "Error while parsing COMPUTE!\n");
return false;
}
continue;
}
// Unknown command type
mp_err(log, "Unrecognized command '%.*s'!\n", BSTR_P(line));
return false;
}
// The rest of the file up until the next magic line beginning (if any)
// shall be the shader body
if (bstr_split_tok(*body, "//!", &out->pass_body, body)) {
// Make sure the magic line is part of the rest
body->start -= 3;
body->len += 3;
}
// Sanity checking
if (hook_idx == 0)
mp_warn(log, "Pass has no hooked textures (will be ignored)!\n");
return true;
}
static bool parse_tex(struct mp_log *log, struct ra *ra, struct bstr *body,
struct gl_user_shader_tex *out)
{
*out = (struct gl_user_shader_tex){
.name = bstr0("USER_TEX"),
.params = {
.dimensions = 2,
.w = 1, .h = 1, .d = 1,
.render_src = true,
.src_linear = true,
},
};
struct ra_tex_params *p = &out->params;
while (true) {
struct bstr rest;
struct bstr line = bstr_strip(bstr_getline(*body, &rest));
if (!bstr_eatstart0(&line, "//!"))
break;
*body = rest;
if (bstr_eatstart0(&line, "TEXTURE")) {
out->name = bstr_strip(line);
continue;
}
if (bstr_eatstart0(&line, "SIZE")) {
p->dimensions = bstr_sscanf(line, "%d %d %d", &p->w, &p->h, &p->d);
if (p->dimensions < 1 || p->dimensions > 3 ||
p->w < 1 || p->h < 1 || p->d < 1)
{
mp_err(log, "Error while parsing SIZE!\n");
return false;
}
continue;
}
if (bstr_eatstart0(&line, "FORMAT ")) {
p->format = NULL;
for (int n = 0; n < ra->num_formats; n++) {
const struct ra_format *fmt = ra->formats[n];
if (bstr_equals0(line, fmt->name)) {
p->format = fmt;
break;
}
}
// (pixel_size==0 is for opaque formats)
if (!p->format || !p->format->pixel_size) {
mp_err(log, "Unrecognized/unavailable FORMAT name: '%.*s'!\n",
BSTR_P(line));
return false;
}
continue;
}
if (bstr_eatstart0(&line, "FILTER")) {
line = bstr_strip(line);
if (bstr_equals0(line, "LINEAR")) {
p->src_linear = true;
} else if (bstr_equals0(line, "NEAREST")) {
p->src_linear = false;
} else {
mp_err(log, "Unrecognized FILTER: '%.*s'!\n", BSTR_P(line));
return false;
}
continue;
}
if (bstr_eatstart0(&line, "BORDER")) {
line = bstr_strip(line);
if (bstr_equals0(line, "CLAMP")) {
p->src_repeat = false;
} else if (bstr_equals0(line, "REPEAT")) {
p->src_repeat = true;
} else {
mp_err(log, "Unrecognized BORDER: '%.*s'!\n", BSTR_P(line));
return false;
}
continue;
}
mp_err(log, "Unrecognized command '%.*s'!\n", BSTR_P(line));
return false;
}
if (!p->format) {
mp_err(log, "No FORMAT specified.\n");
return false;
}
if (p->src_linear && !p->format->linear_filter) {
mp_err(log, "The specified texture format cannot be filtered!\n");
return false;
}
// Decode the rest of the section (up to the next //! marker) as raw hex
// data for the texture
struct bstr hexdata;
if (bstr_split_tok(*body, "//!", &hexdata, body)) {
// Make sure the magic line is part of the rest
body->start -= 3;
body->len += 3;
}
struct bstr tex;
if (!bstr_decode_hex(NULL, bstr_strip(hexdata), &tex)) {
mp_err(log, "Error while parsing TEXTURE body: must be a valid "
"hexadecimal sequence, on a single line!\n");
return false;
}
int expected_len = p->w * p->h * p->d * p->format->pixel_size;
if (tex.len != expected_len) {
mp_err(log, "Shader TEXTURE size mismatch: got %zd bytes, expected %d!\n",
tex.len, expected_len);
talloc_free(tex.start);
return false;
}
p->initial_data = tex.start;
return true;
}
void parse_user_shader(struct mp_log *log, struct ra *ra, struct bstr shader,
void *priv,
bool (*dohook)(void *p, struct gl_user_shader_hook hook),
bool (*dotex)(void *p, struct gl_user_shader_tex tex))
{
if (!dohook || !dotex || !shader.len)
return;
// Skip all garbage (e.g. comments) before the first header
int pos = bstr_find(shader, bstr0("//!"));
if (pos < 0) {
mp_warn(log, "Shader appears to contain no headers!\n");
return;
}
shader = bstr_cut(shader, pos);
// Loop over the file
while (shader.len > 0)
{
// Peek at the first header to dispatch the right type
if (bstr_startswith0(shader, "//!TEXTURE")) {
struct gl_user_shader_tex t;
if (!parse_tex(log, ra, &shader, &t) || !dotex(priv, t))
return;
continue;
}
struct gl_user_shader_hook h;
if (!parse_hook(log, &shader, &h) || !dohook(priv, h))
return;
}
}
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