render/gles2: reword wlr_gles2_texture comments

These comments were a bit misleading:

- "GL_TEXTURE_2D == mutable": not really, imported non-external-only
  DMA-BUFs would also use this target, but are not mutable.
- "Only affects target == GL_TEXTURE_2D": same here.
- "If imported from a wlr_buffer": not really, would be NULL if
  imported from a shm wlr_buffer.

Adjust these comments to better reflect reality and adjust the check
in gles2_texture_update_from_buffer().

1 files changed, 2 insertions, 7 deletions

diff --git a/include/render/gles2.h b/include/render/gles2.h
index 58972675..60bf4d17 100644
--- a/include/render/gles2.h
+++ b/include/render/gles2.h
@@ -118,19 +118,14 @@ struct wlr_gles2_texture {
 	struct wlr_gles2_renderer *renderer;
 	struct wl_list link; // wlr_gles2_renderer.textures
 
-	// Basically:
-	//   GL_TEXTURE_2D == mutable
-	//   GL_TEXTURE_EXTERNAL_OES == immutable
 	GLenum target;
 	bool owns_tex;
 	GLuint tex;
 
 	bool has_alpha;
 
-	// Only affects target == GL_TEXTURE_2D
-	uint32_t drm_format; // used to interpret upload data
-	// If imported from a wlr_buffer
-	struct wlr_gles2_buffer *buffer;
+	uint32_t drm_format; // for mutable textures only, used to interpret upload data
+	struct wlr_gles2_buffer *buffer; // for DMA-BUF imports only
 };
 
 struct wlr_gles2_render_pass {