vo_opengl: kill off FBOTEX_COMPUTE again

The textures not having an FBO actually caused regressions when trying
to render the subtitles on top of this texture (--blend-subtitles),
which still relied on an FBO.

So just kill off the logic entirely. Why worry about a single FBO wasted
when we're allocating like 10 anyway.

Fixes #4657.

3 files changed, 16 insertions, 26 deletions

diff --git a/video/out/opengl/utils.c b/video/out/opengl/utils.c
index 451010fffa..d6dac42195 100644
--- a/video/out/opengl/utils.c
+++ b/video/out/opengl/utils.c
@@ -265,11 +265,8 @@ bool fbotex_init(struct fbotex *fbo, GL *gl, struct mp_log *log, int w, int h,
 
 // Like fbotex_init(), except it can be called on an already initialized FBO;
 // and if the parameters are the same as the previous call, do not touch it.
-// flags can be 0, or a combination of FBOTEX_FUZZY_W, FBOTEX_FUZZY_H and
-// FBOTEX_COMPUTE.
+// flags can be 0, or a combination of FBOTEX_FUZZY_W and FBOTEX_FUZZY_H.
 // Enabling FUZZY for W or H means the w or h does not need to be exact.
-// FBOTEX_COMPUTE means that the texture will be written to by a compute shader
-// instead of actually being attached to an FBO.
 bool fbotex_change(struct fbotex *fbo, GL *gl, struct mp_log *log, int w, int h,
                    GLenum iformat, int flags)
 {
@@ -318,6 +315,7 @@ bool fbotex_change(struct fbotex *fbo, GL *gl, struct mp_log *log, int w, int h,
         .iformat = iformat,
     };
 
+    gl->GenFramebuffers(1, &fbo->fbo);
     gl->GenTextures(1, &fbo->texture);
     gl->BindTexture(GL_TEXTURE_2D, fbo->texture);
     gl->TexImage2D(GL_TEXTURE_2D, 0, format->internal_format, fbo->rw, fbo->rh, 0,
@@ -330,24 +328,21 @@ bool fbotex_change(struct fbotex *fbo, GL *gl, struct mp_log *log, int w, int h,
 
     gl_check_error(gl, log, "after creating framebuffer texture");
 
-    bool skip_fbo = flags & FBOTEX_COMPUTE;
-    if (!skip_fbo) {
-        gl->GenFramebuffers(1, &fbo->fbo);
-        gl->BindFramebuffer(GL_FRAMEBUFFER, fbo->fbo);
-        gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
-                                 GL_TEXTURE_2D, fbo->texture, 0);
-
-        GLenum err = gl->CheckFramebufferStatus(GL_FRAMEBUFFER);
-        if (err != GL_FRAMEBUFFER_COMPLETE) {
-            mp_err(log, "Error: framebuffer completeness check failed (error=%d).\n",
-                   (int)err);
-            res = false;
-        }
-
-        gl->BindFramebuffer(GL_FRAMEBUFFER, 0);
-        gl_check_error(gl, log, "after creating framebuffer");
+    gl->BindFramebuffer(GL_FRAMEBUFFER, fbo->fbo);
+    gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                             GL_TEXTURE_2D, fbo->texture, 0);
+
+    GLenum err = gl->CheckFramebufferStatus(GL_FRAMEBUFFER);
+    if (err != GL_FRAMEBUFFER_COMPLETE) {
+        mp_err(log, "Error: framebuffer completeness check failed (error=%d).\n",
+               (int)err);
+        res = false;
     }
 
+    gl->BindFramebuffer(GL_FRAMEBUFFER, 0);
+
+    gl_check_error(gl, log, "after creating framebuffer");
+
     return res;
 }
 
diff --git a/video/out/opengl/utils.h b/video/out/opengl/utils.h
index f2c405fa9a..d91907fe9f 100644
--- a/video/out/opengl/utils.h
+++ b/video/out/opengl/utils.h
@@ -66,7 +66,6 @@ bool fbotex_change(struct fbotex *fbo, GL *gl, struct mp_log *log, int w, int h,
 #define FBOTEX_FUZZY_W 1
 #define FBOTEX_FUZZY_H 2
 #define FBOTEX_FUZZY (FBOTEX_FUZZY_W | FBOTEX_FUZZY_H)
-#define FBOTEX_COMPUTE 4
 void fbotex_set_filter(struct fbotex *fbo, GLenum gl_filter);
 void fbotex_invalidate(struct fbotex *fbo);
 
diff --git a/video/out/opengl/video.c b/video/out/opengl/video.c
index d1edfa02fb..949c74b0fe 100644
--- a/video/out/opengl/video.c
+++ b/video/out/opengl/video.c
@@ -1263,13 +1263,9 @@ static void finish_pass_direct(struct gl_video *p, GLint fbo, int vp_w, int vp_h
 static void finish_pass_fbo(struct gl_video *p, struct fbotex *dst_fbo,
                             int w, int h, int flags)
 {
-    bool use_compute = p->compute_w > 0 && p->compute_h > 0;
-    if (use_compute)
-        flags |= FBOTEX_COMPUTE;
-
     fbotex_change(dst_fbo, p->gl, p->log, w, h, p->opts.fbo_format, flags);
 
-    if (use_compute) {
+    if (p->compute_w > 0 && p->compute_h > 0) {
         gl_sc_uniform_image2D(p->sc, "out_image", dst_fbo->texture,
                               dst_fbo->iformat, GL_WRITE_ONLY);
         GLSL(imageStore(out_image, ivec2(gl_GlobalInvocationID), color);)