hwdec/dmabuf_interop_gl: migrate to EXT_EGL_image_storage on desktop GL

As it turns out OES_EGL_image is only defined for OpenGL ES.
OpenGL drivers implement this extension anyway because it used to be
the only way of importing EGLImages into GL.

An equivalent extension for OpenGL was defined with EXT_EGL_image_storage.
The only difference is the interaction with immutability, which requires
textures to be recreated since they can be bound only once.

Note: this commit can in theory cause certain systems to lose vaapi / drmprime
support. Since EXT_EGL_image_storage is 7 years old this hopefully doesn't happen.
If it does, the init checks can be relaxed to still permit OES_EGL_image.

video/out/hwdec/dmabuf_interop_gl.c

@@ -62,6 +62,8 @@ struct vaapi_gl_mapper_priv {
                                               const EGLint *);
     EGLBoolean (EGLAPIENTRY *DestroyImageKHR)(EGLDisplay, EGLImageKHR);
     void (EGLAPIENTRY *EGLImageTargetTexture2DOES)(GLenum, GLeglImageOES);
+    void (EGLAPIENTRY *EGLImageTargetTexStorageEXT)(GLenum, GLeglImageOES,
+                                                    const GLint *);
 };
 
 static bool gl_create_textures(struct ra_hwdec_mapper *mapper)
@@ -125,21 +127,31 @@ static bool vaapi_gl_mapper_init(struct ra_hwdec_mapper *mapper,
         // EGL_KHR_image_base
         .CreateImageKHR = (void *)eglGetProcAddress("eglCreateImageKHR"),
         .DestroyImageKHR = (void *)eglGetProcAddress("eglDestroyImageKHR"),
-        // GL_OES_EGL_image
-        .EGLImageTargetTexture2DOES =
-            (void *)eglGetProcAddress("glEGLImageTargetTexture2DOES"),
     };
+    if (ra_gl_get(mapper->ra)->es) {
+        // GL_OES_EGL_image
+        p->EGLImageTargetTexture2DOES =
+            (void *)eglGetProcAddress("glEGLImageTargetTexture2DOES");
+    } else {
+        // GL_EXT_EGL_image_storage
+        p->EGLImageTargetTexStorageEXT =
+            (void *)eglGetProcAddress("glEGLImageTargetTexStorageEXT");
+    }
 
     if (!p->CreateImageKHR || !p->DestroyImageKHR ||
-        !p->EGLImageTargetTexture2DOES)
+        (!p->EGLImageTargetTexture2DOES && !p->EGLImageTargetTexStorageEXT)) {
         return false;
+    }
 
     // remember format to allow texture recreation
     for (int n = 0; n < desc->num_planes; n++) {
         p->planes[n] = desc->planes[n];
     }
-    if (!gl_create_textures(mapper))
-        return false;
+    if (p->EGLImageTargetTexture2DOES) {
+        // created only once
+        if (!gl_create_textures(mapper))
+            return false;
+    }
 
     return true;
 }
@@ -191,6 +203,11 @@ static bool vaapi_gl_map(struct ra_hwdec_mapper *mapper,
 
     GL *gl = ra_gl_get(mapper->ra);
 
+    if (p->EGLImageTargetTexStorageEXT) {
+        if (!gl_create_textures(mapper))
+            return false;
+    }
+
     for (int i = 0, n = 0; i < p_mapper->desc.nb_layers; i++) {
         /*
          * As we must map surfaces as one texture per plane, we can only support
@@ -281,7 +298,11 @@ static bool vaapi_gl_map(struct ra_hwdec_mapper *mapper,
             }
 
             gl->BindTexture(GL_TEXTURE_2D, p->gl_textures[n]);
-            p->EGLImageTargetTexture2DOES(GL_TEXTURE_2D, p->images[n]);
+            if (p->EGLImageTargetTexStorageEXT) {
+                p->EGLImageTargetTexStorageEXT(GL_TEXTURE_2D, p->images[n], NULL);
+            } else {
+                p->EGLImageTargetTexture2DOES(GL_TEXTURE_2D, p->images[n]);
+            }
 
             mapper->tex[n] = p_mapper->tex[n];
         }
@@ -296,12 +317,18 @@ static void vaapi_gl_unmap(struct ra_hwdec_mapper *mapper)
     struct dmabuf_interop_priv *p_mapper = mapper->priv;
     struct vaapi_gl_mapper_priv *p = p_mapper->interop_mapper_priv;
 
-    if (p) {
-        for (int n = 0; n < 4; n++) {
-            if (p->images[n])
-                p->DestroyImageKHR(eglGetCurrentDisplay(), p->images[n]);
-            p->images[n] = 0;
-        }
+    if (!p)
+        return;
+
+    if (p->EGLImageTargetTexStorageEXT) {
+        // textures are immutable, can't reuse
+        gl_delete_textures(mapper);
+    }
+
+    for (int n = 0; n < 4; n++) {
+        if (p->images[n])
+            p->DestroyImageKHR(eglGetCurrentDisplay(), p->images[n]);
+        p->images[n] = 0;
     }
 }
 
@@ -321,16 +348,18 @@ bool dmabuf_interop_gl_init(const struct ra_hwdec *hw,
         return false;
 
     GL *gl = ra_gl_get(hw->ra_ctx->ra);
+    const char *imageext = gl->es ? "GL_OES_EGL_image" : "GL_EXT_EGL_image_storage";
     if (!gl_check_extension(exts, "EGL_EXT_image_dma_buf_import") ||
         !gl_check_extension(exts, "EGL_KHR_image_base") ||
-        !gl_check_extension(gl->extensions, "GL_OES_EGL_image") ||
-        !(gl->mpgl_caps & MPGL_CAP_TEX_RG))
+        !gl_check_extension(gl->extensions, imageext) ||
+        !(gl->mpgl_caps & MPGL_CAP_TEX_RG)) {
         return false;
+    }
 
     dmabuf_interop->use_modifiers =
         gl_check_extension(exts, "EGL_EXT_image_dma_buf_import_modifiers");
 
-    MP_VERBOSE(hw, "using EGL dmabuf interop\n");
+    MP_VERBOSE(hw, "Using EGL dmabuf interop via %s\n", imageext);
 
     dmabuf_interop->interop_init = vaapi_gl_mapper_init;
     dmabuf_interop->interop_uninit = vaapi_gl_mapper_uninit;