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, 42 insertions, 109 deletions

diff --git a/video/out/opengl/utils.h b/video/out/opengl/utils.h
index 7d00d26cf5..18cab476ed 100644
--- a/video/out/opengl/utils.h
+++ b/video/out/opengl/utils.h
@@ -1,121 +1,54 @@
-#pragma once
+/*
+ * This file is part of mpv.
+ * Parts based on MPlayer code by Reimar Döffinger.
+ *
+ * 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_UTILS_
+#define MP_GL_UTILS_
 
-#include <stdbool.h>
 #include <math.h>
 
-#include "video/out/vo.h"
-#include "ra.h"
+#include "video/out/gpu/utils.h"
+#include "common.h"
 
-// A 3x2 matrix, with the translation part separate.
-struct gl_transform {
-    // row-major, e.g. in mathematical notation:
-    //  | m[0][0] m[0][1] |
-    //  | m[1][0] m[1][1] |
-    float m[2][2];
-    float t[2];
-};
-
-static const struct gl_transform identity_trans = {
-    .m = {{1.0, 0.0}, {0.0, 1.0}},
-    .t = {0.0, 0.0},
-};
-
-void gl_transform_ortho(struct gl_transform *t, float x0, float x1,
-                        float y0, float y1);
-
-// This treats m as an affine transformation, in other words m[2][n] gets
-// added to the output.
-static inline void gl_transform_vec(struct gl_transform t, float *x, float *y)
-{
-    float vx = *x, vy = *y;
-    *x = vx * t.m[0][0] + vy * t.m[0][1] + t.t[0];
-    *y = vx * t.m[1][0] + vy * t.m[1][1] + t.t[1];
-}
+struct mp_log;
 
-struct mp_rect_f {
-    float x0, y0, x1, y1;
-};
-
-// Semantic equality (fuzzy comparison)
-static inline bool mp_rect_f_seq(struct mp_rect_f a, struct mp_rect_f b)
-{
-    return fabs(a.x0 - b.x0) < 1e-6 && fabs(a.x1 - b.x1) < 1e-6 &&
-           fabs(a.y0 - b.y0) < 1e-6 && fabs(a.y1 - b.y1) < 1e-6;
-}
-
-static inline void gl_transform_rect(struct gl_transform t, struct mp_rect_f *r)
-{
-    gl_transform_vec(t, &r->x0, &r->y0);
-    gl_transform_vec(t, &r->x1, &r->y1);
-}
+void gl_check_error(GL *gl, struct mp_log *log, const char *info);
 
-static inline bool gl_transform_eq(struct gl_transform a, struct gl_transform b)
-{
-    for (int x = 0; x < 2; x++) {
-        for (int y = 0; y < 2; y++) {
-            if (a.m[x][y] != b.m[x][y])
-                return false;
-        }
-    }
+void gl_upload_tex(GL *gl, GLenum target, GLenum format, GLenum type,
+                   const void *dataptr, int stride,
+                   int x, int y, int w, int h);
 
-    return a.t[0] == b.t[0] && a.t[1] == b.t[1];
-}
+mp_image_t *gl_read_fbo_contents(GL *gl, int fbo, int w, int h);
 
-void gl_transform_trans(struct gl_transform t, struct gl_transform *x);
-
-struct fbodst {
-    struct ra_tex *tex;
-    bool flip; // mirror vertically
+struct gl_vao {
+    GL *gl;
+    GLuint vao;     // the VAO object, or 0 if unsupported by driver
+    GLuint buffer;  // GL_ARRAY_BUFFER used for the data
+    int stride;     // size of each element (interleaved elements are assumed)
+    const struct ra_renderpass_input *entries;
+    int num_entries;
 };
 
-void gl_transform_ortho_fbodst(struct gl_transform *t, struct fbodst fbo);
-
-// A pool of buffers, which can grow as needed
-struct ra_buf_pool {
-    struct ra_buf_params current_params;
-    struct ra_buf **buffers;
-    int num_buffers;
-    int index;
-};
-
-void ra_buf_pool_uninit(struct ra *ra, struct ra_buf_pool *pool);
-
-// Note: params->initial_data is *not* supported
-struct ra_buf *ra_buf_pool_get(struct ra *ra, struct ra_buf_pool *pool,
-                               const struct ra_buf_params *params);
-
-// Helper that wraps ra_tex_upload using texture upload buffers to ensure that
-// params->buf is always set. This is intended for RA-internal usage.
-bool ra_tex_upload_pbo(struct ra *ra, struct ra_buf_pool *pbo,
-                       const struct ra_tex_upload_params *params);
-
-// Layout rules for GLSL's packing modes
-struct ra_layout std140_layout(struct ra_renderpass_input *inp);
-struct ra_layout std430_layout(struct ra_renderpass_input *inp);
-
-struct fbotex {
-    struct ra *ra;
-    struct ra_tex *tex;
-    int lw, lh; // logical (configured) size, <= than texture size
-    struct fbodst fbo;
-};
-
-void fbotex_uninit(struct fbotex *fbo);
-bool fbotex_change(struct fbotex *fbo, struct ra *ra, struct mp_log *log,
-                   int w, int h, const struct ra_format *fmt, int flags);
-#define FBOTEX_FUZZY_W 1
-#define FBOTEX_FUZZY_H 2
-#define FBOTEX_FUZZY (FBOTEX_FUZZY_W | FBOTEX_FUZZY_H)
-
-// A wrapper around ra_timer that does result pooling, averaging etc.
-struct timer_pool;
+void gl_vao_init(struct gl_vao *vao, GL *gl, int stride,
+                 const struct ra_renderpass_input *entries,
+                 int num_entries);
+void gl_vao_uninit(struct gl_vao *vao);
+void gl_vao_draw_data(struct gl_vao *vao, GLenum prim, void *ptr, size_t num);
 
-struct timer_pool *timer_pool_create(struct ra *ra);
-void timer_pool_destroy(struct timer_pool *pool);
-void timer_pool_start(struct timer_pool *pool);
-void timer_pool_stop(struct timer_pool *pool);
-struct mp_pass_perf timer_pool_measure(struct timer_pool *pool);
+void gl_set_debug_logger(GL *gl, struct mp_log *log);
 
-// print a multi line string with line numbers (e.g. for shader sources)
-// log, lev: module and log level, as in mp_msg()
-void mp_log_source(struct mp_log *log, int lev, const char *src);
+#endif