diff options
| author | Paul Berry <[email protected]> | 2012-12-12 14:14:12 -0800 |
|---|---|---|
| committer | Paul Berry <[email protected]> | 2012-12-18 08:31:26 -0800 |
| commit | 3870f2903f030969491fa287b7f8d7eaf1d2f4f9 (patch) | |
| tree | b8e7ef37f0079d80a497cfd17f8699db6ffb10d8 /src/mesa/main | |
| parent | 61c1b065fbdd224fa547f035991210859c7af310 (diff) | |
mesa: refactor _mesa_compute_max_transform_feedback_vertices from i965.
Previously, the i965 driver contained code to compute the maximum
number of vertices that could be written without overflowing any
transform feedback buffers. This code wasn't driver-specific, and for
GLES3 support we're going to need to use it in core mesa. So this
patch moves the code into a core mesa function,
_mesa_compute_max_transform_feedback_vertices().
Reviewed-by: Ian Romanick <[email protected]>
v2: Eliminate C++-style variable declarations, since these won't work
with MSVC.
Reviewed-by: Jordan Justen <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
Diffstat (limited to 'src/mesa/main')
| -rw-r--r-- | src/mesa/main/transformfeedback.c | 29 | ||||
| -rw-r--r-- | src/mesa/main/transformfeedback.h | 5 |
2 files changed, 34 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 **/ diff --git a/src/mesa/main/transformfeedback.h b/src/mesa/main/transformfeedback.h index 01c2af3599b..3c03b7a2413 100644 --- a/src/mesa/main/transformfeedback.h +++ b/src/mesa/main/transformfeedback.h @@ -46,6 +46,11 @@ _mesa_validate_transform_feedback_buffers(struct gl_context *ctx); extern void _mesa_init_transform_feedback_functions(struct dd_function_table *driver); +extern unsigned +_mesa_compute_max_transform_feedback_vertices( + const struct gl_transform_feedback_object *obj, + const struct gl_transform_feedback_info *info); + /*** GL_EXT_transform_feedback ***/ |