mpv/video/out/gl_osd.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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <assert.h>
#include <libavutil/common.h>
#include "bitmap_packer.h"
#include "gl_utils.h"
#include "gl_osd.h"
struct osd_fmt_entry {
GLint internal_format;
GLint format;
GLenum type;
};
// 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},
};
static const struct osd_fmt_entry osd_to_gl3_formats[SUBBITMAP_COUNT] = {
[SUBBITMAP_LIBASS] = {GL_RED, GL_RED, GL_UNSIGNED_BYTE},
[SUBBITMAP_RGBA] = {GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE},
};
static const struct osd_fmt_entry osd_to_gles3_formats[SUBBITMAP_COUNT] = {
[SUBBITMAP_LIBASS] = {GL_R8, GL_RED, GL_UNSIGNED_BYTE},
[SUBBITMAP_RGBA] = {GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE},
};
static const struct osd_fmt_entry osd_to_gl2_formats[SUBBITMAP_COUNT] = {
[SUBBITMAP_LIBASS] = {GL_LUMINANCE, GL_LUMINANCE, GL_UNSIGNED_BYTE},
[SUBBITMAP_RGBA] = {GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE},
};
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;
GLuint buffer;
int num_subparts;
struct sub_bitmap *subparts;
struct vertex *vertices;
struct bitmap_packer *packer;
};
struct mpgl_osd {
struct mp_log *log;
struct osd_state *osd;
GL *gl;
bool use_pbo;
bool scaled;
struct mpgl_osd_part *parts[MAX_OSD_PARTS];
const struct osd_fmt_entry *fmt_table;
bool formats[SUBBITMAP_COUNT];
struct gl_vao vao;
// temporary
int stereo_mode;
int display_size[2];
void *scratch;
};
struct mpgl_osd *mpgl_osd_init(GL *gl, struct mp_log *log, struct osd_state *osd)
{
GLint max_texture_size;
gl->GetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size);
struct mpgl_osd *ctx = talloc_ptrtype(NULL, ctx);
*ctx = (struct mpgl_osd) {
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.log = log,
.osd = osd,
.gl = gl,
.fmt_table = osd_to_gl3_formats,
.scratch = talloc_zero_size(ctx, 1),
};
if (gl->es >= 300) {
ctx->fmt_table = osd_to_gles3_formats;
} else if (!(gl->mpgl_caps & MPGL_CAP_TEX_RG)) {
ctx->fmt_table = osd_to_gl2_formats;
}
for (int n = 0; n < MAX_OSD_PARTS; n++) {
struct mpgl_osd_part *p = talloc_ptrtype(ctx, p);
*p = (struct mpgl_osd_part) {
.packer = talloc_struct(p, struct bitmap_packer, {
.w_max = max_texture_size,
.h_max = max_texture_size,
}),
};
ctx->parts[n] = p;
}
for (int n = 0; n < SUBBITMAP_COUNT; n++)
ctx->formats[n] = ctx->fmt_table[n].type != 0;
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);
if (gl->DeleteBuffers)
gl->DeleteBuffers(1, &p->buffer);
}
talloc_free(ctx);
}
void mpgl_osd_set_options(struct mpgl_osd *ctx, bool pbo)
{
ctx->use_pbo = pbo;
}
static bool upload_pbo(struct mpgl_osd *ctx, struct mpgl_osd_part *osd,
struct sub_bitmaps *imgs)
{
GL *gl = ctx->gl;
bool success = true;
struct osd_fmt_entry fmt = ctx->fmt_table[imgs->format];
int pix_stride = glFmt2bpp(fmt.format, fmt.type);
if (!osd->buffer) {
gl->GenBuffers(1, &osd->buffer);
gl->BindBuffer(GL_PIXEL_UNPACK_BUFFER, osd->buffer);
gl->BufferData(GL_PIXEL_UNPACK_BUFFER, osd->w * osd->h * pix_stride,
NULL, GL_DYNAMIC_COPY);
gl->BindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
}
gl->BindBuffer(GL_PIXEL_UNPACK_BUFFER, osd->buffer);
char *data = gl->MapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY);
if (!data) {
success = false;
} else {
struct pos bb[2];
packer_get_bb(osd->packer, bb);
size_t stride = osd->w * pix_stride;
packer_copy_subbitmaps(osd->packer, imgs, data, pix_stride, stride);
if (!gl->UnmapBuffer(GL_PIXEL_UNPACK_BUFFER))
success = false;
glUploadTex(gl, GL_TEXTURE_2D, fmt.format, fmt.type, NULL, stride,
bb[0].x, bb[0].y, bb[1].x - bb[0].x, bb[1].y - bb[0].y, 0);
}
gl->BindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
if (!success) {
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MP_FATAL(ctx, "Error: can't upload subtitles! "
"Remove the 'pbo' suboption.\n");
}
return success;
}
static void upload_tex(struct mpgl_osd *ctx, struct mpgl_osd_part *osd,
struct sub_bitmaps *imgs)
{
struct osd_fmt_entry fmt = ctx->fmt_table[imgs->format];
if (osd->packer->padding) {
struct pos bb[2];
packer_get_bb(osd->packer, bb);
glClearTex(ctx->gl, GL_TEXTURE_2D, fmt.format, fmt.type,
bb[0].x, bb[0].y, bb[1].x - bb[0].y, bb[1].y - bb[0].y,
0, &ctx->scratch);
}
for (int n = 0; n < osd->packer->count; n++) {
struct sub_bitmap *s = &imgs->parts[n];
struct pos p = osd->packer->result[n];
glUploadTex(ctx->gl, GL_TEXTURE_2D, fmt.format, fmt.type,
s->bitmap, s->stride, p.x, p.y, s->w, s->h, 0);
}
}
static bool upload_osd(struct mpgl_osd *ctx, struct mpgl_osd_part *osd,
struct sub_bitmaps *imgs)
{
GL *gl = ctx->gl;
// assume 2x2 filter on scaling
osd->packer->padding = ctx->scaled || imgs->scaled;
int r = packer_pack_from_subbitmaps(osd->packer, imgs);
if (r < 0) {
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MP_ERR(ctx, "OSD bitmaps do not fit on a surface with the maximum "
"supported size %dx%d.\n", osd->packer->w_max, osd->packer->h_max);
return false;
}
struct osd_fmt_entry fmt = ctx->fmt_table[imgs->format];
assert(fmt.type != 0);
if (!osd->texture)
gl->GenTextures(1, &osd->texture);
gl->BindTexture(GL_TEXTURE_2D, osd->texture);
if (osd->packer->w > osd->w || osd->packer->h > osd->h
|| osd->format != imgs->format)
{
osd->format = imgs->format;
osd->w = FFMAX(32, osd->packer->w);
osd->h = FFMAX(32, osd->packer->h);
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);
if (gl->DeleteBuffers)
gl->DeleteBuffers(1, &osd->buffer);
osd->buffer = 0;
}
bool uploaded = false;
if (ctx->use_pbo)
uploaded = upload_pbo(ctx, osd, imgs);
if (!uploaded)
upload_tex(ctx, osd, imgs);
gl->BindTexture(GL_TEXTURE_2D, 0);
return true;
}
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];
if (imgs->change_id != osd->change_id) {
if (!upload_osd(ctx, osd, imgs))
osd->packer->count = 0;
osd->change_id = imgs->change_id;
}
osd->num_subparts = osd->packer->count;
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 pos pos = part->packer->result[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,
pos.x, pos.y, pos.x + b->w, pos.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->display_size[0] * x;
float a_y = ctx->display_size[1] * 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;
}
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;
int div[2];
get_3d_side_by_side(stereo_mode, div);
struct mp_osd_res s_res = res;
ctx->display_size[0] = s_res.w = s_res.w / div[0];
ctx->display_size[1] = s_res.h = s_res.h / div[1];
osd_draw(ctx->osd, s_res, pts, draw_flags, ctx->formats, gen_osd_cb, ctx);
ctx->stereo_mode = stereo_mode;
}