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intel: Don't try to do work for BufferSubData with a size of 0.

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If we hit the linear blit path, we'd come up with a pitch of 0, then
divide by zero.

Fixes vbo-subdata-zero, made for bug #28931 (warsow).
This commit is contained in:
Eric Anholt 2010-08-20 12:36:34 -07:00
parent 5482eaba6e
commit 27e6552a8f
1 changed files with 6 additions and 0 deletions
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6
src/mesa/drivers/dri/intel/intel_buffer_objects.c
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@ -202,6 +202,9 @@ intel_bufferobj_subdata(GLcontext * ctx,
struct intel_context *intel = intel_context(ctx);
struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
if (size == 0)
return;
assert(intel_obj);
if (intel_obj->region)
@ -426,6 +429,9 @@ intel_bufferobj_flush_mapped_range(GLcontext *ctx, GLenum target,
if (intel_obj->range_map_buffer == NULL)
return;
if (length == 0)
return;
temp_bo = drm_intel_bo_alloc(intel->bufmgr, "range map flush", length, 64);
drm_intel_bo_subdata(temp_bo, 0, length, intel_obj->range_map_buffer);