+ obj->Length = obj->Size;
+ obj->Offset = 0;
+
+ return obj->Pointer;
+}
+
+/**
+ * Called via glMapBufferRange().
+ *
+ * The goal of this extension is to allow apps to accumulate their rendering
+ * at the same time as they accumulate their buffer object. Without it,
+ * you'd end up blocking on execution of rendering every time you mapped
+ * the buffer to put new data in.
+ *
+ * We support it in 3 ways: If unsynchronized, then don't bother
+ * flushing the batchbuffer before mapping the buffer, which can save blocking
+ * in many cases. If we would still block, and they allow the whole buffer
+ * to be invalidated, then just allocate a new buffer to replace the old one.
+ * If not, and we'd block, and they allow the subrange of the buffer to be
+ * invalidated, then we can make a new little BO, let them write into that,
+ * and blit it into the real BO at unmap time.
+ */
+static void *
+intel_bufferobj_map_range(GLcontext * ctx,
+ GLenum target, GLintptr offset, GLsizeiptr length,
+ GLbitfield access, struct gl_buffer_object *obj)
+{
+ struct intel_context *intel = intel_context(ctx);
+ struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
+
+ assert(intel_obj);
+
+ /* _mesa_MapBufferRange (GL entrypoint) sets these, but the vbo module also
+ * internally uses our functions directly.
+ */
+ obj->Offset = offset;
+ obj->Length = length;
+ obj->AccessFlags = access;
+
+ if (intel_obj->sys_buffer) {
+ obj->Pointer = intel_obj->sys_buffer + offset;
+ return obj->Pointer;
+ }
+
+ if (intel_obj->region)
+ intel_bufferobj_cow(intel, intel_obj);
+
+ /* If the mapping is synchronized with other GL operations, flush
+ * the batchbuffer so that GEM knows about the buffer access for later
+ * syncing.
+ */
+ if (!(access & GL_MAP_UNSYNCHRONIZED_BIT) &&
+ drm_intel_bo_references(intel->batch->buf, intel_obj->buffer))
+ intelFlush(ctx);
+
+ if (intel_obj->buffer == NULL) {
+ obj->Pointer = NULL;
+ return NULL;
+ }
+
+ /* If the user doesn't care about existing buffer contents and mapping
+ * would cause us to block, then throw out the old buffer.
+ */
+ if (!(access & GL_MAP_UNSYNCHRONIZED_BIT) &&
+ (access & GL_MAP_INVALIDATE_BUFFER_BIT) &&
+ drm_intel_bo_busy(intel_obj->buffer)) {
+ drm_intel_bo_unreference(intel_obj->buffer);
+ intel_obj->buffer = dri_bo_alloc(intel->bufmgr, "bufferobj",
+ intel_obj->Base.Size, 64);
+ }
+
+ /* If the user is mapping a range of an active buffer object but
+ * doesn't require the current contents of that range, make a new
+ * BO, and we'll copy what they put in there out at unmap or
+ * FlushRange time.
+ */
+ if ((access & GL_MAP_INVALIDATE_RANGE_BIT) &&
+ drm_intel_bo_busy(intel_obj->buffer)) {
+ if (access & GL_MAP_FLUSH_EXPLICIT_BIT) {
+ intel_obj->range_map_buffer = _mesa_malloc(length);
+ obj->Pointer = intel_obj->range_map_buffer;
+ } else {
+ intel_obj->range_map_bo = drm_intel_bo_alloc(intel->bufmgr,
+ "range map",
+ length, 64);
+ if (!(access & GL_MAP_READ_BIT) &&
+ intel->intelScreen->kernel_exec_fencing) {
+ drm_intel_gem_bo_map_gtt(intel_obj->range_map_bo);
+ intel_obj->mapped_gtt = GL_TRUE;
+ } else {
+ drm_intel_bo_map(intel_obj->range_map_bo,
+ (access & GL_MAP_WRITE_BIT) != 0);
+ intel_obj->mapped_gtt = GL_FALSE;
+ }
+ obj->Pointer = intel_obj->range_map_bo->virtual;
+ }
+ return obj->Pointer;
+ }
+
+ if (!(access & GL_MAP_READ_BIT) &&
+ intel->intelScreen->kernel_exec_fencing) {
+ drm_intel_gem_bo_map_gtt(intel_obj->buffer);
+ intel_obj->mapped_gtt = GL_TRUE;
+ } else {
+ drm_intel_bo_map(intel_obj->buffer, (access & GL_MAP_WRITE_BIT) != 0);
+ intel_obj->mapped_gtt = GL_FALSE;
+ }
+
+ obj->Pointer = intel_obj->buffer->virtual + offset;