From de3e26bc846eee938248c9be3a688091f0eab49c Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Fri, 19 Dec 2014 00:15:29 +0100
Subject: vo_opengl: disable some unavailable features under ES

There are probably many more which I overlooked.
---
 video/out/gl_common.c | 5 ++++-
 video/out/gl_video.c  | 7 +++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/video/out/gl_common.c b/video/out/gl_common.c
index 8d511bd13b..7389d90370 100644
--- a/video/out/gl_common.c
+++ b/video/out/gl_common.c
@@ -802,6 +802,8 @@ void glClearTex(GL *gl, GLenum target, GLenum format, GLenum type,
 void glDownloadTex(GL *gl, GLenum target, GLenum format, GLenum type,
                    void *dataptr, int stride)
 {
+    if (!gl->GetTexImage)
+        abort();
     // this is not always correct, but should work for MPlayer
     glAdjustAlignment(gl, stride);
     gl->PixelStorei(GL_PACK_ROW_LENGTH, stride / glFmt2bpp(format, type));
@@ -810,12 +812,13 @@ void glDownloadTex(GL *gl, GLenum target, GLenum format, GLenum type,
 
 mp_image_t *glGetWindowScreenshot(GL *gl)
 {
+    if (gl->es)
+        return NULL; // ES can't read from front buffer
     GLint vp[4]; //x, y, w, h
     gl->GetIntegerv(GL_VIEWPORT, vp);
     mp_image_t *image = mp_image_alloc(IMGFMT_RGB24, vp[2], vp[3]);
     if (!image)
         return NULL;
-    gl->BindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
     gl->PixelStorei(GL_PACK_ALIGNMENT, 1);
     gl->PixelStorei(GL_PACK_ROW_LENGTH, 0);
     gl->ReadBuffer(GL_FRONT);
diff --git a/video/out/gl_video.c b/video/out/gl_video.c
index 8541559b90..5fafcd04f1 100644
--- a/video/out/gl_video.c
+++ b/video/out/gl_video.c
@@ -1933,7 +1933,7 @@ struct mp_image *gl_video_download_image(struct gl_video *p)
 
     struct video_image *vimg = &p->image;
 
-    if (!p->have_image)
+    if (!p->have_image || !gl->GetTexImage)
         return NULL;
 
     if (p->hwdec_active && p->hwdec->driver->download_image) {
@@ -2060,7 +2060,6 @@ static bool test_fbo(struct gl_video *p, GLenum format)
     GL *gl = p->gl;
     bool success = false;
     struct fbotex fbo = {0};
-    gl->BindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
     gl->PixelStorei(GL_PACK_ALIGNMENT, 1);
     gl->PixelStorei(GL_PACK_ROW_LENGTH, 0);
     if (fbotex_init(p, &fbo, 16, 16, format)) {
@@ -2145,6 +2144,10 @@ static void check_gl_features(struct gl_video *p)
         p->opts.scale_sep = false;
         p->opts.indirect = false;
     }
+    if (gl->es && p->opts.pbo) {
+        p->opts.pbo = 0;
+        disabled[n_disabled++] = "PBOs (GLES unsupported)";
+    }
 
     if (n_disabled) {
         MP_ERR(p, "Some OpenGL extensions not detected, disabling: ");
-- 
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