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-rw-r--r--indra/llrender/llimagegl.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/indra/llrender/llimagegl.h b/indra/llrender/llimagegl.h
index bbd024abd9..a03233323b 100644
--- a/indra/llrender/llimagegl.h
+++ b/indra/llrender/llimagegl.h
@@ -118,6 +118,9 @@ public:
BOOL createGLTexture(S32 discard_level, const U8* data, BOOL data_hasmips = FALSE, S32 usename = 0, bool defer_copy = false, LLGLuint* tex_name = nullptr);
void setImage(const LLImageRaw* imageraw);
BOOL setImage(const U8* data_in, BOOL data_hasmips = FALSE, S32 usename = 0);
+ // *NOTE: force_fast_update should only be used if the texture is not
+ // compressed (i.e. RenderCompressTextures is 0). Partial image updates
+ // (glTexSubImage2D) do not work on compressed textures.
BOOL setSubImage(const LLImageRaw* imageraw, S32 x_pos, S32 y_pos, S32 width, S32 height, BOOL force_fast_update = FALSE, LLGLuint use_name = 0);
BOOL setSubImage(const U8* datap, S32 data_width, S32 data_height, S32 x_pos, S32 y_pos, S32 width, S32 height, BOOL force_fast_update = FALSE, LLGLuint use_name = 0);
BOOL setSubImageFromFrameBuffer(S32 fb_x, S32 fb_y, S32 x_pos, S32 y_pos, S32 width, S32 height);