Mesa (master): i965/upload: Refactor open-coded ALIGN-like computations.

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: 91f4528da620de6518db8f85e6a08c88687d0269
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=91f4528da620de6518db8f85e6a08c88687d0269

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Sun Mar  2 23:09:20 2014 -0800

i965/upload: Refactor open-coded ALIGN-like computations.

Sadly, we can't use actual ALIGN(), since that only supports
power-of-two values for the alignment parameter.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>

---

 src/mesa/drivers/dri/i965/intel_upload.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/intel_upload.c b/src/mesa/drivers/dri/i965/intel_upload.c
index ac16dcc..ec3109b 100644
--- a/src/mesa/drivers/dri/i965/intel_upload.c
+++ b/src/mesa/drivers/dri/i965/intel_upload.c
@@ -45,6 +45,12 @@
 
 #define INTEL_UPLOAD_SIZE (64*1024)
 
+/**
+ * Like ALIGN(), but works with a non-power-of-two alignment.
+ */
+#define ALIGN_NPOT(value, alignment) \
+   (((value) + (alignment) - 1) / (alignment) * (alignment))
+
 void
 intel_upload_finish(struct brw_context *brw)
 {
@@ -83,7 +89,7 @@ intel_upload_data(struct brw_context *brw,
 {
    GLuint base, delta;
 
-   base = (brw->upload.offset + align - 1) / align * align;
+   base = ALIGN_NPOT(brw->upload.offset, align);
    if (brw->upload.bo == NULL || base + size > brw->upload.bo->size) {
       wrap_buffers(brw, size);
       base = 0;
@@ -124,7 +130,7 @@ intel_upload_map(struct brw_context *brw, GLuint size, GLuint align)
    GLuint base, delta;
    char *ptr;
 
-   base = (brw->upload.offset + align - 1) / align * align;
+   base = ALIGN_NPOT(brw->upload.offset, align);
    if (brw->upload.bo == NULL || base + size > brw->upload.bo->size) {
       wrap_buffers(brw, size);
       base = 0;
@@ -163,7 +169,7 @@ intel_upload_unmap(struct brw_context *brw,
 {
    GLuint base;
 
-   base = (brw->upload.offset + align - 1) / align * align;
+   base = ALIGN_NPOT(brw->upload.offset, align);
    if (size > sizeof(brw->upload.buffer)) {
       drm_intel_bo_subdata(brw->upload.bo, base, size, ptr);
       free((void*)ptr);