diff options
| -rw-r--r-- | src/mesa/main/bufferobj.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c index 5b6db78d821..e4f964f1826 100644 --- a/src/mesa/main/bufferobj.c +++ b/src/mesa/main/bufferobj.c @@ -526,11 +526,23 @@ _mesa_copy_buffer_subdata(struct gl_context *ctx, assert(!_mesa_bufferobj_mapped(src)); assert(!_mesa_bufferobj_mapped(dst)); - srcPtr = ctx->Driver.MapBufferRange(ctx, readOffset, size, - GL_MAP_READ_BIT, src); - dstPtr = ctx->Driver.MapBufferRange(ctx, writeOffset, size, - (GL_MAP_WRITE_BIT | - GL_MAP_INVALIDATE_RANGE_BIT), dst); + if (src == dst) { + srcPtr = dstPtr = ctx->Driver.MapBufferRange(ctx, 0, src->Size, + GL_MAP_READ_BIT | + GL_MAP_WRITE_BIT, src); + + if (!srcPtr) + return; + + srcPtr += readOffset; + dstPtr += writeOffset; + } else { + srcPtr = ctx->Driver.MapBufferRange(ctx, readOffset, size, + GL_MAP_READ_BIT, src); + dstPtr = ctx->Driver.MapBufferRange(ctx, writeOffset, size, + (GL_MAP_WRITE_BIT | + GL_MAP_INVALIDATE_RANGE_BIT), dst); + } /* Note: the src and dst regions will never overlap. Trying to do so * would generate GL_INVALID_VALUE earlier. @@ -539,7 +551,8 @@ _mesa_copy_buffer_subdata(struct gl_context *ctx, memcpy(dstPtr, srcPtr, size); ctx->Driver.UnmapBuffer(ctx, src); - ctx->Driver.UnmapBuffer(ctx, dst); + if (dst != src) + ctx->Driver.UnmapBuffer(ctx, dst); } |