aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/mesa/main/pbo.c
diff options
context:
space:
mode:
Diffstat (limited to 'mesalib/src/mesa/main/pbo.c')
-rw-r--r--mesalib/src/mesa/main/pbo.c106
1 files changed, 63 insertions, 43 deletions
diff --git a/mesalib/src/mesa/main/pbo.c b/mesalib/src/mesa/main/pbo.c
index dc00d423b..15e0480e9 100644
--- a/mesalib/src/mesa/main/pbo.c
+++ b/mesalib/src/mesa/main/pbo.c
@@ -43,7 +43,7 @@
* When we're about to read pixel data out of a PBO (via glDrawPixels,
* glTexImage, etc) or write data into a PBO (via glReadPixels,
* glGetTexImage, etc) we call this function to check that we're not
- * going to read out of bounds.
+ * going to read/write out of bounds.
*
* XXX This would also be a convenient time to check that the PBO isn't
* currently mapped. Whoever calls this function should check for that.
@@ -56,43 +56,52 @@
* \param depth depth of image to read/write
* \param format format of image to read/write
* \param type datatype of image to read/write
+ * \param clientMemSize the maximum number of bytes to read/write
* \param ptr the user-provided pointer/offset
- * \return GL_TRUE if the PBO access is OK, GL_FALSE if the access would
+ * \return GL_TRUE if the buffer access is OK, GL_FALSE if the access would
* go out of bounds.
*/
GLboolean
_mesa_validate_pbo_access(GLuint dimensions,
const struct gl_pixelstore_attrib *pack,
GLsizei width, GLsizei height, GLsizei depth,
- GLenum format, GLenum type, const GLvoid *ptr)
+ GLenum format, GLenum type, GLsizei clientMemSize,
+ const GLvoid *ptr)
{
- GLvoid *start, *end;
+ const GLvoid *start, *end, *offset;
const GLubyte *sizeAddr; /* buffer size, cast to a pointer */
- if (!_mesa_is_bufferobj(pack->BufferObj))
- return GL_TRUE; /* no PBO, OK */
+ /* If no PBO is bound, 'ptr' is a pointer to client memory containing
+ 'clientMemSize' bytes.
+ If a PBO is bound, 'ptr' is an offset into the bound PBO.
+ In that case 'clientMemSize' is ignored: we just use the PBO's size.
+ */
+ if (!_mesa_is_bufferobj(pack->BufferObj)) {
+ offset = 0;
+ sizeAddr = ((const GLubyte *) 0) + clientMemSize;
+ } else {
+ offset = ptr;
+ sizeAddr = ((const GLubyte *) 0) + pack->BufferObj->Size;
+ }
- if (pack->BufferObj->Size == 0)
+ if (sizeAddr == 0)
/* no buffer! */
return GL_FALSE;
- /* get address of first pixel we'll read */
- start = _mesa_image_address(dimensions, pack, ptr, width, height,
+ /* get the offset to the first pixel we'll read/write */
+ start = _mesa_image_address(dimensions, pack, offset, width, height,
format, type, 0, 0, 0);
- /* get address just past the last pixel we'll read */
- end = _mesa_image_address(dimensions, pack, ptr, width, height,
+ /* get the offset to just past the last pixel we'll read/write */
+ end = _mesa_image_address(dimensions, pack, offset, width, height,
format, type, depth-1, height-1, width);
-
- sizeAddr = ((const GLubyte *) 0) + pack->BufferObj->Size;
-
if ((const GLubyte *) start > sizeAddr) {
/* This will catch negative values / wrap-around */
return GL_FALSE;
}
if ((const GLubyte *) end > sizeAddr) {
- /* Image read goes beyond end of buffer */
+ /* Image read/write goes beyond end of buffer */
return GL_FALSE;
}
@@ -146,24 +155,30 @@ _mesa_map_pbo_source(struct gl_context *ctx,
*/
const GLvoid *
_mesa_map_validate_pbo_source(struct gl_context *ctx,
- GLuint dimensions,
- const struct gl_pixelstore_attrib *unpack,
- GLsizei width, GLsizei height, GLsizei depth,
- GLenum format, GLenum type, const GLvoid *ptr,
- const char *where)
+ GLuint dimensions,
+ const struct gl_pixelstore_attrib *unpack,
+ GLsizei width, GLsizei height, GLsizei depth,
+ GLenum format, GLenum type, GLsizei clientMemSize,
+ const GLvoid *ptr, const char *where)
{
ASSERT(dimensions == 1 || dimensions == 2 || dimensions == 3);
- if (!_mesa_is_bufferobj(unpack->BufferObj)) {
- /* non-PBO access: no validation to be done */
- return ptr;
+ if (!_mesa_validate_pbo_access(dimensions, unpack, width, height, depth,
+ format, type, clientMemSize, ptr)) {
+ if (_mesa_is_bufferobj(unpack->BufferObj)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "%s(out of bounds PBO access)", where);
+ } else {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "%s(out of bounds access: bufSize (%d) is too small)",
+ where, clientMemSize);
+ }
+ return NULL;
}
- if (!_mesa_validate_pbo_access(dimensions, unpack,
- width, height, depth, format, type, ptr)) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "%s(out of bounds PBO access)", where);
- return NULL;
+ if (!_mesa_is_bufferobj(unpack->BufferObj)) {
+ /* non-PBO access: no further validation to be done */
+ return ptr;
}
if (_mesa_bufferobj_mapped(unpack->BufferObj)) {
@@ -236,24 +251,30 @@ _mesa_map_pbo_dest(struct gl_context *ctx,
*/
GLvoid *
_mesa_map_validate_pbo_dest(struct gl_context *ctx,
- GLuint dimensions,
- const struct gl_pixelstore_attrib *unpack,
- GLsizei width, GLsizei height, GLsizei depth,
- GLenum format, GLenum type, GLvoid *ptr,
- const char *where)
+ GLuint dimensions,
+ const struct gl_pixelstore_attrib *unpack,
+ GLsizei width, GLsizei height, GLsizei depth,
+ GLenum format, GLenum type, GLsizei clientMemSize,
+ GLvoid *ptr, const char *where)
{
ASSERT(dimensions == 1 || dimensions == 2 || dimensions == 3);
- if (!_mesa_is_bufferobj(unpack->BufferObj)) {
- /* non-PBO access: no validation to be done */
- return ptr;
+ if (!_mesa_validate_pbo_access(dimensions, unpack, width, height, depth,
+ format, type, clientMemSize, ptr)) {
+ if (_mesa_is_bufferobj(unpack->BufferObj)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "%s(out of bounds PBO access)", where);
+ } else {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "%s(out of bounds access: bufSize (%d) is too small)",
+ where, clientMemSize);
+ }
+ return NULL;
}
- if (!_mesa_validate_pbo_access(dimensions, unpack,
- width, height, depth, format, type, ptr)) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "%s(out of bounds PBO access)", where);
- return NULL;
+ if (!_mesa_is_bufferobj(unpack->BufferObj)) {
+ /* non-PBO access: no further validation to be done */
+ return ptr;
}
if (_mesa_bufferobj_mapped(unpack->BufferObj)) {
@@ -281,7 +302,6 @@ _mesa_unmap_pbo_dest(struct gl_context *ctx,
}
-
/**
* Check if an unpack PBO is active prior to fetching a texture image.
* If so, do bounds checking and map the buffer into main memory.
@@ -302,7 +322,7 @@ _mesa_validate_pbo_teximage(struct gl_context *ctx, GLuint dimensions,
return pixels;
}
if (!_mesa_validate_pbo_access(dimensions, unpack, width, height, depth,
- format, type, pixels)) {
+ format, type, INT_MAX, pixels)) {
_mesa_error(ctx, GL_INVALID_OPERATION, funcName, "(invalid PBO access)");
return NULL;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 10:00:20 +0000