vo_opengl: refactor into vo_gpu

This is done in several steps:

1. refactor MPGLContext -> struct ra_ctx
2. move GL-specific stuff in vo_opengl into opengl/context.c
3. generalize context creation to support other APIs, and add --gpu-api
4. rename all of the --opengl- options that are no longer opengl-specific
5. move all of the stuff from opengl/* that isn't GL-specific into gpu/
   (note: opengl/gl_utils.h became opengl/utils.h)
6. rename vo_opengl to vo_gpu
7. to handle window screenshots, the short-term approach was to just add
   it to ra_swchain_fns. Long term (and for vulkan) this has to be moved to
   ra itself (and vo_gpu altered to compensate), but this was a stop-gap
   measure to prevent this commit from getting too big
8. move ra->fns->flush to ra_gl_ctx instead
9. some other minor changes that I've probably already forgotten

Note: This is one half of a major refactor, the other half of which is
provided by rossy's following commit. This commit enables support for
all linux platforms, while his version enables support for all non-linux
platforms.

Note 2: vo_opengl_cb.c also re-uses ra_gl_ctx so it benefits from the
--opengl- options like --opengl-early-flush, --opengl-finish etc. Should
be a strict superset of the old functionality.

Disclaimer: Since I have no way of compiling mpv on all platforms, some
of these ports were done blindly. Specifically, the blind ports included
context_mali_fbdev.c and context_rpi.c. Since they're both based on
egl_helpers, the port should have gone smoothly without any major
changes required. But if somebody complains about a compile error on
those platforms (assuming anybody actually uses them), you know where to
complain.

1 files changed, 0 insertions, 98 deletions

diff --git a/video/out/opengl/user_shaders.h b/video/out/opengl/user_shaders.h
deleted file mode 100644
index 94a070c8e2..0000000000
--- a/video/out/opengl/user_shaders.h
+++ /dev/null
@@ -1,98 +0,0 @@
-/*
- * 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 "utils.h"
-#include "ra.h"
-
-#define SHADER_MAX_PASSES 32
-#define SHADER_MAX_HOOKS 16
-#define SHADER_MAX_BINDS 6
-#define SHADER_MAX_SAVED 64
-#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 compute_info {
-    bool active;
-    int block_w, block_h;     // Block size (each block corresponds to one WG)
-    int threads_w, threads_h; // How many threads form a working group
-    bool directly_writes;     // If true, shader is assumed to imageStore(out_image)
-};
-
-struct gl_user_shader_hook {
-    struct bstr pass_desc;
-    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;
-    struct compute_info compute;
-};
-
-struct gl_user_shader_tex {
-    struct bstr name;
-    struct ra_tex_params params;
-    // for video.c
-    struct ra_tex *tex;
-};
-
-// Parse the next shader block from `body`. The callbacks are invoked on every
-// valid shader block parsed.
-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));
-
-// 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