swrast: use _swrast_pixel_address() helper function

Reviewed-by: Eric Anholt <[email protected]>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/mesa/swrast/s_context.h b/src/mesa/swrast/s_context.h
index 446b990d990..af9e49ecbb6 100644
--- a/src/mesa/swrast/s_context.h
+++ b/src/mesa/swrast/s_context.h
@@ -422,5 +422,17 @@ _swrast_unmap_renderbuffers(struct gl_context *ctx);
 #define ATTRIB_LOOP_END } }
 
 
+/**
+ * Return the address of a pixel value in a mapped renderbuffer.
+ */
+static inline GLubyte *
+_swrast_pixel_address(struct gl_renderbuffer *rb, GLint x, GLint y)
+{
+   const GLint bpp = _mesa_get_format_bytes(rb->Format);
+   const GLint rowStride = rb->RowStride * bpp;
+   return (GLubyte *) rb->Data + y * rowStride + x * bpp;
+}
+
+
 
 #endif