mesa: allow buffers mapped with the persistent flag to be used by the GPU

v2: also fixed InvalidateBufferData, added citations from the 4.4 spec

Reviewed-by: Fredrik Höglund <fredrik@kde.org>

7 files changed, 35 insertions, 21 deletions

diff --git a/src/mesa/main/api_validate.c b/src/mesa/main/api_validate.c
index af469e046fc..ce007e26598 100644
--- a/src/mesa/main/api_validate.c
+++ b/src/mesa/main/api_validate.c
@@ -865,7 +865,7 @@ valid_draw_indirect(struct gl_context *ctx,
       return GL_FALSE;
    }
 
-   if (_mesa_bufferobj_mapped(ctx->DrawIndirectBuffer)) {
+   if (_mesa_check_disallowed_mapping(ctx->DrawIndirectBuffer)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
                   "%s(DRAW_INDIRECT_BUFFER is mapped)", name);
       return GL_FALSE;
diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index b971014e6e5..3079127ce6c 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.c
@@ -269,6 +269,9 @@ buffer_object_subdata_range_good(struct gl_context * ctx, GLenum target,
       return NULL;
    }
 
+   if (bufObj->AccessFlags & GL_MAP_PERSISTENT_BIT)
+      return bufObj;
+
    if (mappedRange) {
       if (bufferobj_range_mapped(bufObj, offset, size)) {
          _mesa_error(ctx, GL_INVALID_OPERATION, "%s", caller);
@@ -1449,7 +1452,7 @@ _mesa_ClearBufferData(GLenum target, GLenum internalformat, GLenum format,
       return;
    }
 
-   if (_mesa_bufferobj_mapped(bufObj)) {
+   if (_mesa_check_disallowed_mapping(bufObj)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
                   "glClearBufferData(buffer currently mapped)");
       return;
@@ -1872,13 +1875,13 @@ _mesa_CopyBufferSubData(GLenum readTarget, GLenum writeTarget,
    if (!dst)
       return;
 
-   if (_mesa_bufferobj_mapped(src)) {
+   if (_mesa_check_disallowed_mapping(src)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
                   "glCopyBufferSubData(readBuffer is mapped)");
       return;
    }
 
-   if (_mesa_bufferobj_mapped(dst)) {
+   if (_mesa_check_disallowed_mapping(dst)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
                   "glCopyBufferSubData(writeBuffer is mapped)");
       return;
@@ -2802,13 +2805,15 @@ _mesa_InvalidateBufferSubData(GLuint buffer, GLintptr offset,
       return;
    }
 
-   /* The GL_ARB_invalidate_subdata spec says:
+   /* The OpenGL 4.4 (Core Profile) spec says:
     *
-    *     "An INVALID_OPERATION error is generated if the buffer is currently
-    *     mapped by MapBuffer, or if the invalidate range intersects the range
-    *     currently mapped by MapBufferRange."
+    *     "An INVALID_OPERATION error is generated if buffer is currently
+    *     mapped by MapBuffer or if the invalidate range intersects the range
+    *     currently mapped by MapBufferRange, unless it was mapped
+    *     with MAP_PERSISTENT_BIT set in the MapBufferRange access flags."
     */
-   if (bufferobj_range_mapped(bufObj, offset, length)) {
+   if (!(bufObj->AccessFlags & GL_MAP_PERSISTENT_BIT) &&
+       bufferobj_range_mapped(bufObj, offset, length)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
                   "glInvalidateBufferSubData(intersection with mapped "
                   "range)");
@@ -2835,13 +2840,14 @@ _mesa_InvalidateBufferData(GLuint buffer)
       return;
    }
 
-   /* The GL_ARB_invalidate_subdata spec says:
+   /* The OpenGL 4.4 (Core Profile) spec says:
     *
-    *     "An INVALID_OPERATION error is generated if the buffer is currently
-    *     mapped by MapBuffer, or if the invalidate range intersects the range
-    *     currently mapped by MapBufferRange."
+    *     "An INVALID_OPERATION error is generated if buffer is currently
+    *     mapped by MapBuffer or if the invalidate range intersects the range
+    *     currently mapped by MapBufferRange, unless it was mapped
+    *     with MAP_PERSISTENT_BIT set in the MapBufferRange access flags."
     */
-   if (_mesa_bufferobj_mapped(bufObj)) {
+   if (_mesa_check_disallowed_mapping(bufObj)) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
                   "glInvalidateBufferData(intersection with mapped "
                   "range)");
diff --git a/src/mesa/main/bufferobj.h b/src/mesa/main/bufferobj.h
index 174fd608ced..253a386c271 100644
--- a/src/mesa/main/bufferobj.h
+++ b/src/mesa/main/bufferobj.h
@@ -44,6 +44,14 @@ _mesa_bufferobj_mapped(const struct gl_buffer_object *obj)
    return obj->Pointer != NULL;
 }
 
+/** Can we not use this buffer while mapped? */
+static inline GLboolean
+_mesa_check_disallowed_mapping(const struct gl_buffer_object *obj)
+{
+   return _mesa_bufferobj_mapped(obj) &&
+          !(obj->AccessFlags & GL_MAP_PERSISTENT_BIT);
+}
+
 /**
  * Is the given buffer object a user-created buffer object?
  * Mesa uses default buffer objects in several places.  Default buffers
diff --git a/src/mesa/main/drawpix.c b/src/mesa/main/drawpix.c
index 096615c05ac..63e5870e687 100644
--- a/src/mesa/main/drawpix.c
+++ b/src/mesa/main/drawpix.c
@@ -151,7 +151,7 @@ _mesa_DrawPixels( GLsizei width, GLsizei height,
                            "glDrawPixels(invalid PBO access)");
                goto end;
             }
-            if (_mesa_bufferobj_mapped(ctx->Unpack.BufferObj)) {
+            if (_mesa_check_disallowed_mapping(ctx->Unpack.BufferObj)) {
                /* buffer is mapped - that's an error */
                _mesa_error(ctx, GL_INVALID_OPERATION,
                            "glDrawPixels(PBO is mapped)");
@@ -335,7 +335,7 @@ _mesa_Bitmap( GLsizei width, GLsizei height,
                            "glBitmap(invalid PBO access)");
                return;
             }
-            if (_mesa_bufferobj_mapped(ctx->Unpack.BufferObj)) {
+            if (_mesa_check_disallowed_mapping(ctx->Unpack.BufferObj)) {
                /* buffer is mapped - that's an error */
                _mesa_error(ctx, GL_INVALID_OPERATION,
                            "glBitmap(PBO is mapped)");
diff --git a/src/mesa/main/pbo.c b/src/mesa/main/pbo.c
index 400cec3f0e2..4a394041778 100644
--- a/src/mesa/main/pbo.c
+++ b/src/mesa/main/pbo.c
@@ -201,7 +201,7 @@ _mesa_map_validate_pbo_source(struct gl_context *ctx,
       return ptr;
    }
 
-   if (_mesa_bufferobj_mapped(unpack->BufferObj)) {
+   if (_mesa_check_disallowed_mapping(unpack->BufferObj)) {
       /* buffer is already mapped - that's an error */
       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(PBO is mapped)", where);
       return NULL;
@@ -297,7 +297,7 @@ _mesa_map_validate_pbo_dest(struct gl_context *ctx,
       return ptr;
    }
 
-   if (_mesa_bufferobj_mapped(unpack->BufferObj)) {
+   if (_mesa_check_disallowed_mapping(unpack->BufferObj)) {
       /* buffer is already mapped - that's an error */
       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(PBO is mapped)", where);
       return NULL;
diff --git a/src/mesa/main/readpix.c b/src/mesa/main/readpix.c
index 522b3464c5d..b09cf54994a 100644
--- a/src/mesa/main/readpix.c
+++ b/src/mesa/main/readpix.c
@@ -1033,7 +1033,7 @@ _mesa_ReadnPixelsARB( GLint x, GLint y, GLsizei width, GLsizei height,
    }
 
    if (_mesa_is_bufferobj(ctx->Pack.BufferObj) &&
-       _mesa_bufferobj_mapped(ctx->Pack.BufferObj)) {
+       _mesa_check_disallowed_mapping(ctx->Pack.BufferObj)) {
       /* buffer is mapped - that's an error */
       _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(PBO is mapped)");
       return;
diff --git a/src/mesa/main/texgetimage.c b/src/mesa/main/texgetimage.c
index 133fa537672..b21aa2cf25f 100644
--- a/src/mesa/main/texgetimage.c
+++ b/src/mesa/main/texgetimage.c
@@ -861,7 +861,7 @@ getteximage_error_check(struct gl_context *ctx, GLenum target, GLint level,
 
    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
       /* PBO should not be mapped */
-      if (_mesa_bufferobj_mapped(ctx->Pack.BufferObj)) {
+      if (_mesa_check_disallowed_mapping(ctx->Pack.BufferObj)) {
          _mesa_error(ctx, GL_INVALID_OPERATION,
                      "glGetTexImage(PBO is mapped)");
          return GL_TRUE;
@@ -1004,7 +1004,7 @@ getcompressedteximage_error_check(struct gl_context *ctx, GLenum target,
       }
 
       /* make sure PBO is not mapped */
-      if (_mesa_bufferobj_mapped(ctx->Pack.BufferObj)) {
+      if (_mesa_check_disallowed_mapping(ctx->Pack.BufferObj)) {
          _mesa_error(ctx, GL_INVALID_OPERATION,
                      "glGetCompressedTexImage(PBO is mapped)");
          return GL_TRUE;