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-rw-r--r--src/mesa/main/macros.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/src/mesa/main/macros.h b/src/mesa/main/macros.h
index 2630855a0e..bfd740870e 100644
--- a/src/mesa/main/macros.h
+++ b/src/mesa/main/macros.h
@@ -54,13 +54,16 @@ extern GLfloat _mesa_ubyte_to_float_color_tab[256];
#define FLOAT_TO_BYTE(X) ( (((GLint) (255.0F * (X))) - 1) / 2 )
-/** Convert GLushort in [0,65536] to GLfloat in [0.0,1.0] */
+/** Convert GLushort in [0,65535] to GLfloat in [0.0,1.0] */
#define USHORT_TO_FLOAT(S) ((GLfloat) (S) * (1.0F / 65535.0F))
+/** Convert GLfloat in [0.0,1.0] to GLushort in [0, 65535] */
+#define FLOAT_TO_USHORT(X) ((GLuint) ((X) * 65535.0))
+
/** Convert GLshort in [-32768,32767] to GLfloat in [-1.0,1.0] */
#define SHORT_TO_FLOAT(S) ((2.0F * (S) + 1.0F) * (1.0F/65535.0F))
-/** Convert GLfloat in [0.0,1.0] to GLshort in [-32768,32767] */
+/** Convert GLfloat in [-1.0,1.0] to GLshort in [-32768,32767] */
#define FLOAT_TO_SHORT(X) ( (((GLint) (65535.0F * (X))) - 1) / 2 )