[vlc-devel] [PATCH] opengl: converter_sw: reset UNPACK_ROW_LENGTH after usage

[Alexandre Janniaux]

From: Louis Segretin <lsegretin.contrib at gmail.com>

Some drivers seem to use this value for glTexSubImage2D even with
GL_PIXEL_UNPACK_BUFFER set to 0. As the rest of the code is not
UNPACK_ROW_LENGTH aware, it is safer to reset it to a non-active value.

For example, this would cause glitches if pictures were uploaded with
this extension but SPU were not, or more generally if another client of
the OpenGL context is updating some textures by itself outside of the
OpenGL renderer.

Looks really close to an OpenGL version of #22267.
---
 modules/video_output/opengl/converter_sw.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/modules/video_output/opengl/converter_sw.c b/modules/video_output/opengl/converter_sw.c
index b5746a637b..3eb3eeb3ae 100644
--- a/modules/video_output/opengl/converter_sw.c
+++ b/modules/video_output/opengl/converter_sw.c
@@ -190,6 +190,8 @@ tc_pbo_update(const opengl_tex_converter_t *tc, GLuint *textures,
 
         tc->vt->TexSubImage2D(tc->tex_target, 0, 0, 0, tex_width[i], tex_height[i],
                               tc->texs[i].format, tc->texs[i].type, NULL);
+
+        tc->vt->PixelStorei(GL_UNPACK_ROW_LENGTH, 0);
     }
 
     /* turn off pbo */
@@ -267,6 +269,7 @@ upload_plane(const opengl_tex_converter_t *tc, unsigned tex_idx,
         tc->vt->PixelStorei(GL_UNPACK_ROW_LENGTH, pitch * width / (visible_pitch ? visible_pitch : 1));
         tc->vt->TexSubImage2D(tc->tex_target, 0, 0, 0, width, height,
                               tex_format, tex_type, pixels);
+        tc->vt->PixelStorei(GL_UNPACK_ROW_LENGTH, 0);
     }
     return VLC_SUCCESS;
 }
-- 
2.24.0