mpv/video/out/opengl/osd.c

361 lines
11 KiB
C

/*
* 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 <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <libavutil/common.h>
#include "formats.h"
#include "utils.h"
#include "osd.h"
// glBlendFuncSeparate() arguments
static const int blend_factors[SUBBITMAP_COUNT][4] = {
[SUBBITMAP_LIBASS] = {GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
GL_ONE, GL_ONE_MINUS_SRC_ALPHA},
[SUBBITMAP_RGBA] = {GL_ONE, GL_ONE_MINUS_SRC_ALPHA,
GL_ONE, GL_ONE_MINUS_SRC_ALPHA},
};
struct vertex {
float position[2];
float texcoord[2];
uint8_t ass_color[4];
};
static const struct gl_vao_entry vertex_vao[] = {
{"position", 2, GL_FLOAT, false, offsetof(struct vertex, position)},
{"texcoord" , 2, GL_FLOAT, false, offsetof(struct vertex, texcoord)},
{"ass_color", 4, GL_UNSIGNED_BYTE, true, offsetof(struct vertex, ass_color)},
{0}
};
struct mpgl_osd_part {
enum sub_bitmap_format format;
int change_id;
GLuint texture;
int w, h;
struct gl_pbo_upload pbo;
int num_subparts;
int prev_num_subparts;
struct sub_bitmap *subparts;
struct vertex *vertices;
};
struct mpgl_osd {
struct mp_log *log;
struct osd_state *osd;
GL *gl;
bool use_pbo;
struct mpgl_osd_part *parts[MAX_OSD_PARTS];
const struct gl_format *fmt_table[SUBBITMAP_COUNT];
bool formats[SUBBITMAP_COUNT];
struct gl_vao vao;
int64_t change_counter;
// temporary
int stereo_mode;
struct mp_osd_res osd_res;
void *scratch;
};
struct mpgl_osd *mpgl_osd_init(GL *gl, struct mp_log *log, struct osd_state *osd)
{
struct mpgl_osd *ctx = talloc_ptrtype(NULL, ctx);
*ctx = (struct mpgl_osd) {
.log = log,
.osd = osd,
.gl = gl,
.scratch = talloc_zero_size(ctx, 1),
};
ctx->fmt_table[SUBBITMAP_LIBASS] = gl_find_unorm_format(gl, 1, 1);
ctx->fmt_table[SUBBITMAP_RGBA] = gl_find_unorm_format(gl, 1, 4);
for (int n = 0; n < MAX_OSD_PARTS; n++)
ctx->parts[n] = talloc_zero(ctx, struct mpgl_osd_part);
for (int n = 0; n < SUBBITMAP_COUNT; n++)
ctx->formats[n] = !!ctx->fmt_table[n];
gl_vao_init(&ctx->vao, gl, sizeof(struct vertex), vertex_vao);
return ctx;
}
void mpgl_osd_destroy(struct mpgl_osd *ctx)
{
if (!ctx)
return;
GL *gl = ctx->gl;
gl_vao_uninit(&ctx->vao);
for (int n = 0; n < MAX_OSD_PARTS; n++) {
struct mpgl_osd_part *p = ctx->parts[n];
gl->DeleteTextures(1, &p->texture);
gl_pbo_upload_uninit(&p->pbo);
}
talloc_free(ctx);
}
void mpgl_osd_set_options(struct mpgl_osd *ctx, bool pbo)
{
ctx->use_pbo = pbo;
}
static int next_pow2(int v)
{
for (int x = 0; x < 30; x++) {
if ((1 << x) >= v)
return 1 << x;
}
return INT_MAX;
}
static bool upload_osd(struct mpgl_osd *ctx, struct mpgl_osd_part *osd,
struct sub_bitmaps *imgs)
{
GL *gl = ctx->gl;
bool ok = false;
assert(imgs->packed);
int req_w = next_pow2(imgs->packed_w);
int req_h = next_pow2(imgs->packed_h);
const struct gl_format *fmt = ctx->fmt_table[imgs->format];
assert(fmt);
if (!osd->texture)
gl->GenTextures(1, &osd->texture);
gl->BindTexture(GL_TEXTURE_2D, osd->texture);
if (req_w > osd->w || req_h > osd->h || osd->format != imgs->format) {
osd->format = imgs->format;
osd->w = FFMAX(32, req_w);
osd->h = FFMAX(32, req_h);
MP_VERBOSE(ctx, "Reallocating OSD texture to %dx%d.\n", osd->w, osd->h);
GLint max_wh;
gl->GetIntegerv(GL_MAX_TEXTURE_SIZE, &max_wh);
if (osd->w > max_wh || osd->h > max_wh) {
MP_ERR(ctx, "OSD bitmaps do not fit on a surface with the maximum "
"supported size %dx%d.\n", max_wh, max_wh);
goto done;
}
gl->TexImage2D(GL_TEXTURE_2D, 0, fmt->internal_format, osd->w, osd->h,
0, fmt->format, fmt->type, NULL);
gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
gl_pbo_upload_tex(&osd->pbo, gl, ctx->use_pbo, GL_TEXTURE_2D, fmt->format,
fmt->type, osd->w, osd->h, imgs->packed->planes[0],
imgs->packed->stride[0], 0, 0,
imgs->packed_w, imgs->packed_h);
ok = true;
done:
gl->BindTexture(GL_TEXTURE_2D, 0);
return ok;
}
static void gen_osd_cb(void *pctx, struct sub_bitmaps *imgs)
{
struct mpgl_osd *ctx = pctx;
if (imgs->num_parts == 0 || !ctx->formats[imgs->format])
return;
struct mpgl_osd_part *osd = ctx->parts[imgs->render_index];
bool ok = true;
if (imgs->change_id != osd->change_id) {
if (!upload_osd(ctx, osd, imgs))
ok = false;
osd->change_id = imgs->change_id;
ctx->change_counter += 1;
}
osd->num_subparts = ok ? imgs->num_parts : 0;
MP_TARRAY_GROW(osd, osd->subparts, osd->num_subparts);
memcpy(osd->subparts, imgs->parts,
osd->num_subparts * sizeof(osd->subparts[0]));
}
static void write_quad(struct vertex *va, struct gl_transform t,
float x0, float y0, float x1, float y1,
float tx0, float ty0, float tx1, float ty1,
float tex_w, float tex_h, const uint8_t color[4])
{
gl_transform_vec(t, &x0, &y0);
gl_transform_vec(t, &x1, &y1);
#define COLOR_INIT {color[0], color[1], color[2], color[3]}
va[0] = (struct vertex){ {x0, y0}, {tx0 / tex_w, ty0 / tex_h}, COLOR_INIT };
va[1] = (struct vertex){ {x0, y1}, {tx0 / tex_w, ty1 / tex_h}, COLOR_INIT };
va[2] = (struct vertex){ {x1, y0}, {tx1 / tex_w, ty0 / tex_h}, COLOR_INIT };
va[3] = (struct vertex){ {x1, y1}, {tx1 / tex_w, ty1 / tex_h}, COLOR_INIT };
va[4] = va[2];
va[5] = va[1];
#undef COLOR_INIT
}
static int generate_verts(struct mpgl_osd_part *part, struct gl_transform t)
{
int num_vertices = part->num_subparts * 6;
MP_TARRAY_GROW(part, part->vertices, num_vertices);
for (int n = 0; n < part->num_subparts; n++) {
struct sub_bitmap *b = &part->subparts[n];
struct vertex *va = part->vertices;
// NOTE: the blend color is used with SUBBITMAP_LIBASS only, so it
// doesn't matter that we upload garbage for the other formats
uint32_t c = b->libass.color;
uint8_t color[4] = { c >> 24, (c >> 16) & 0xff,
(c >> 8) & 0xff, 255 - (c & 0xff) };
write_quad(&va[n * 6], t,
b->x, b->y, b->x + b->dw, b->y + b->dh,
b->src_x, b->src_y, b->src_x + b->w, b->src_y + b->h,
part->w, part->h, color);
}
return num_vertices;
}
static void draw_part(struct mpgl_osd *ctx, int index, struct gl_transform t)
{
GL *gl = ctx->gl;
struct mpgl_osd_part *part = ctx->parts[index];
int num_vertices = generate_verts(part, t);
if (!num_vertices)
return;
gl->Enable(GL_BLEND);
gl->BindTexture(GL_TEXTURE_2D, part->texture);
const int *factors = &blend_factors[part->format][0];
gl->BlendFuncSeparate(factors[0], factors[1], factors[2], factors[3]);
gl_vao_draw_data(&ctx->vao, GL_TRIANGLES, part->vertices, num_vertices);
gl->BindTexture(GL_TEXTURE_2D, 0);
gl->Disable(GL_BLEND);
}
// number of screen divisions per axis (x=0, y=1) for the current 3D mode
static void get_3d_side_by_side(int stereo_mode, int div[2])
{
div[0] = div[1] = 1;
switch (stereo_mode) {
case MP_STEREO3D_SBS2L:
case MP_STEREO3D_SBS2R: div[0] = 2; break;
case MP_STEREO3D_AB2R:
case MP_STEREO3D_AB2L: div[1] = 2; break;
}
}
void mpgl_osd_draw_part(struct mpgl_osd *ctx, int vp_w, int vp_h, int index)
{
int div[2];
get_3d_side_by_side(ctx->stereo_mode, div);
ctx->gl->Viewport(0, 0, vp_w, abs(vp_h));
for (int x = 0; x < div[0]; x++) {
for (int y = 0; y < div[1]; y++) {
struct gl_transform t;
gl_transform_ortho(&t, 0, vp_w, 0, vp_h);
float a_x = ctx->osd_res.w * x;
float a_y = ctx->osd_res.h * y;
t.t[0] += a_x * t.m[0][0] + a_y * t.m[1][0];
t.t[1] += a_x * t.m[0][1] + a_y * t.m[1][1];
draw_part(ctx, index, t);
}
}
}
enum sub_bitmap_format mpgl_osd_get_part_format(struct mpgl_osd *ctx, int index)
{
assert(index >= 0 && index < MAX_OSD_PARTS);
return ctx->parts[index]->format;
}
struct gl_vao *mpgl_osd_get_vao(struct mpgl_osd *ctx)
{
return &ctx->vao;
}
static void set_res(struct mpgl_osd *ctx, struct mp_osd_res res, int stereo_mode)
{
int div[2];
get_3d_side_by_side(stereo_mode, div);
res.w /= div[0];
res.h /= div[1];
ctx->osd_res = res;
}
void mpgl_osd_generate(struct mpgl_osd *ctx, struct mp_osd_res res, double pts,
int stereo_mode, int draw_flags)
{
for (int n = 0; n < MAX_OSD_PARTS; n++)
ctx->parts[n]->num_subparts = 0;
set_res(ctx, res, stereo_mode);
osd_draw(ctx->osd, ctx->osd_res, pts, draw_flags, ctx->formats, gen_osd_cb, ctx);
ctx->stereo_mode = stereo_mode;
// Parts going away does not necessarily result in gen_osd_cb() being called
// (not even with num_parts==0), so check this separately.
for (int n = 0; n < MAX_OSD_PARTS; n++) {
struct mpgl_osd_part *part = ctx->parts[n];
if (part->num_subparts != part->prev_num_subparts)
ctx->change_counter += 1;
part->prev_num_subparts = part->num_subparts;
}
}
// See osd_resize() for remarks. This function is an optional optimization too.
void mpgl_osd_resize(struct mpgl_osd *ctx, struct mp_osd_res res, int stereo_mode)
{
set_res(ctx, res, stereo_mode);
osd_resize(ctx->osd, ctx->osd_res);
}
int64_t mpgl_get_change_counter(struct mpgl_osd *ctx)
{
return ctx->change_counter;
}