From 580fc06c612873a6bd87b12b471529b4a7412747 Mon Sep 17 00:00:00 2001 From: Iago Toral Quiroga Date: Tue, 5 Sep 2017 13:54:31 +0200 Subject: [PATCH] mesa/main: Fix GetTransformFeedbacki64 for glTransformFeedbackBufferBase MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The spec has special rules for querying buffer offsets and sizes when BindBufferBase is used, described in the OpenGL 4.6 spec, section 6.8 Buffer Object State: "To query the starting offset or size of the range of a buffer object binding in an indexed array, call GetInteger64i_v with target set to respectively the starting offset or binding size name from table 6.5 for that array. Index must be in the range zero to the number of bind points supported minus one. If the starting offset or size was not specified when the buffer object was bound (e.g. if it was bound with BindBufferBase), or if no buffer object is bound to the target array at index, zero is returned." Transform feedback buffer queries should follow the same rules, since it is the same case for them. There is a CTS test for this. Fixes: KHR-GL45.direct_state_access.xfb_buffers Reviewed-by: Samuel Iglesias Gonsálvez --- src/mesa/main/transformfeedback.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/src/mesa/main/transformfeedback.c b/src/mesa/main/transformfeedback.c index befc744..a5ea2a5 100644 --- a/src/mesa/main/transformfeedback.c +++ b/src/mesa/main/transformfeedback.c @@ -1402,12 +1402,34 @@ _mesa_GetTransformFeedbacki64_v(GLuint xfb, GLenum pname, GLuint index, return; } + /** + * This follows the same general rules used for BindBufferBase: + * + * "To query the starting offset or size of the range of a buffer + * object binding in an indexed array, call GetInteger64i_v with + * target set to respectively the starting offset or binding size + * name from table 6.5 for that array. Index must be in the range + * zero to the number of bind points supported minus one. If the + * starting offset or size was not specified when the buffer object + * was bound (e.g. if it was bound with BindBufferBase), or if no + * buffer object is bound to the target array at index, zero is + * returned." + */ + if (obj->RequestedSize[index] == 0 && + (pname == GL_TRANSFORM_FEEDBACK_BUFFER_START || + pname == GL_TRANSFORM_FEEDBACK_BUFFER_SIZE)) { + *param = 0; + return; + } + compute_transform_feedback_buffer_sizes(obj); switch(pname) { case GL_TRANSFORM_FEEDBACK_BUFFER_START: + assert(obj->RequestedSize[index] > 0); *param = obj->Offset[index]; break; case GL_TRANSFORM_FEEDBACK_BUFFER_SIZE: + assert(obj->RequestedSize[index] > 0); *param = obj->Size[index]; break; default: -- 2.7.4