diff options
Diffstat (limited to 'src/mesa/state_tracker/st_cb_bufferobjects.c')
| -rw-r--r-- | src/mesa/state_tracker/st_cb_bufferobjects.c | 36 |
1 files changed, 24 insertions, 12 deletions
diff --git a/src/mesa/state_tracker/st_cb_bufferobjects.c b/src/mesa/state_tracker/st_cb_bufferobjects.c index 27540c36ce..8b60f9040d 100644 --- a/src/mesa/state_tracker/st_cb_bufferobjects.c +++ b/src/mesa/state_tracker/st_cb_bufferobjects.c @@ -211,6 +211,13 @@ st_bufferobj_data(struct gl_context *ctx, /** + * Dummy data whose's pointer is used for zero size buffers or ranges. + */ +static long st_bufferobj_zero_length = 0; + + + +/** * Called via glMapBufferARB(). */ static void * @@ -233,10 +240,16 @@ st_bufferobj_map(struct gl_context *ctx, GLenum target, GLenum access, break; } - obj->Pointer = pipe_buffer_map(st_context(ctx)->pipe, - st_obj->buffer, - flags, - &st_obj->transfer); + /* Handle zero-size buffers here rather than in drivers */ + if (obj->Size == 0) { + obj->Pointer = &st_bufferobj_zero_length; + } + else { + obj->Pointer = pipe_buffer_map(st_context(ctx)->pipe, + st_obj->buffer, + flags, + &st_obj->transfer); + } if (obj->Pointer) { obj->Offset = 0; @@ -247,13 +260,6 @@ st_bufferobj_map(struct gl_context *ctx, GLenum target, GLenum access, /** - * Dummy data whose's pointer is used for zero length ranges. - */ -static long -st_bufferobj_zero_length_range = 0; - - -/** * Called via glMapBufferRange(). */ static void * @@ -273,6 +279,12 @@ st_bufferobj_map_range(struct gl_context *ctx, GLenum target, if (access & GL_MAP_FLUSH_EXPLICIT_BIT) flags |= PIPE_TRANSFER_FLUSH_EXPLICIT; + + if (access & GL_MAP_INVALIDATE_RANGE_BIT) + flags |= PIPE_TRANSFER_DISCARD; + + if (access & GL_MAP_INVALIDATE_BUFFER_BIT) + flags |= PIPE_TRANSFER_DISCARD; if (access & GL_MAP_UNSYNCHRONIZED_BIT) flags |= PIPE_TRANSFER_UNSYNCHRONIZED; @@ -293,7 +305,7 @@ st_bufferobj_map_range(struct gl_context *ctx, GLenum target, * length range from the pipe driver. */ if (!length) { - obj->Pointer = &st_bufferobj_zero_length_range; + obj->Pointer = &st_bufferobj_zero_length; } else { obj->Pointer = pipe_buffer_map_range(pipe, |