vo_opengl: use standard functions to retrieve display depth

Until now, we've used system-specific API (GLX, EGL, etc.) to retrieve
the depth of the default framebuffer. (We equal this to display depth
and use the determined depth for dithering.)

We can actually retrieve this value through standard GL API, and it
works everywhere (except GLES 2 of course). This simplifies everything a
great deal.

egl_helpers.c is empty now. But I expect that some EGL boilerplate will
be moved to it, so don't remove it yet.

1 files changed, 2 insertions, 1 deletions

diff --git a/video/out/opengl/common.h b/video/out/opengl/common.h
index ea5442b4ff..7427befe99 100644
--- a/video/out/opengl/common.h
+++ b/video/out/opengl/common.h
@@ -91,7 +91,6 @@ struct GL {
     char *extensions;           // Equivalent to GL_EXTENSIONS
     int mpgl_caps;              // Bitfield of MPGL_CAP_* constants
     bool debug_context;         // use of e.g. GLX_CONTEXT_DEBUG_BIT_ARB
-    int fb_r, fb_g, fb_b;       // frame buffer bit depth (0 if unknown)
 
     void (GLAPIENTRY *Viewport)(GLint, GLint, GLsizei, GLsizei);
     void (GLAPIENTRY *Clear)(GLbitfield);
@@ -169,6 +168,8 @@ struct GL {
                                             GLint);
     void (GLAPIENTRY *BlitFramebuffer)(GLint, GLint, GLint, GLint, GLint, GLint,
                                        GLint, GLint, GLbitfield, GLenum);
+    void (GLAPIENTRY *GetFramebufferAttachmentParameteriv)(GLenum, GLenum,
+                                                           GLenum, GLint *);
 
     void (GLAPIENTRY *Uniform1f)(GLint, GLfloat);
     void (GLAPIENTRY *Uniform2f)(GLint, GLfloat, GLfloat);