diff options
Diffstat (limited to 'src/mesa/main/transformfeedback.c')
| -rw-r--r-- | src/mesa/main/transformfeedback.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/mesa/main/transformfeedback.c b/src/mesa/main/transformfeedback.c index 22060c34c97..d9c6e514e8f 100644 --- a/src/mesa/main/transformfeedback.c +++ b/src/mesa/main/transformfeedback.c @@ -34,6 +34,7 @@ #include "bufferobj.h" #include "context.h" #include "hash.h" +#include "macros.h" #include "mfeatures.h" #include "mtypes.h" #include "transformfeedback.h" @@ -246,6 +247,34 @@ _mesa_init_transform_feedback_functions(struct dd_function_table *driver) /** + * Compute the maximum number of vertices that can be written to the currently + * enabled transform feedback buffers without overflowing any of them. + */ +unsigned +_mesa_compute_max_transform_feedback_vertices( + const struct gl_transform_feedback_object *obj, + const struct gl_transform_feedback_info *info) +{ + unsigned max_index = 0xffffffff; + unsigned i; + + for (i = 0; i < info->NumBuffers; ++i) { + unsigned stride = info->BufferStride[i]; + unsigned max_for_this_buffer; + + /* Skip any inactive buffers, which have a stride of 0. */ + if (stride == 0) + continue; + + max_for_this_buffer = obj->Size[i] / (4 * stride); + max_index = MIN2(max_index, max_for_this_buffer); + } + + return max_index; +} + + +/** ** Begin API functions **/ |