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Diffstat (limited to 'mesalib/src/mesa/main/bufferobj.c')
-rw-r--r--mesalib/src/mesa/main/bufferobj.c27
1 files changed, 20 insertions, 7 deletions
diff --git a/mesalib/src/mesa/main/bufferobj.c b/mesalib/src/mesa/main/bufferobj.c
index 75f6e9bb6..7238a2d60 100644
--- a/mesalib/src/mesa/main/bufferobj.c
+++ b/mesalib/src/mesa/main/bufferobj.c
@@ -520,17 +520,29 @@ _mesa_copy_buffer_subdata(struct gl_context *ctx,
GLintptr readOffset, GLintptr writeOffset,
GLsizeiptr size)
{
- void *srcPtr, *dstPtr;
+ GLubyte *srcPtr, *dstPtr;
/* the buffers should not be mapped */
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);
}