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-rw-r--r--src/mesa/main/macros.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/mesa/main/macros.h b/src/mesa/main/macros.h
index 4ca7957ffa..3d9a1aba98 100644
--- a/src/mesa/main/macros.h
+++ b/src/mesa/main/macros.h
@@ -99,6 +99,9 @@ extern GLfloat _mesa_ubyte_to_float_color_tab[256];
/* a close approximation: */
#define FLOAT_TO_INT(X) ( (GLint) (2147483647.0 * (X)) )
+/** Convert GLfloat in [-1.0,1.0] to GLint64 in [-(1<<63),(1 << 63) -1] */
+#define FLOAT_TO_INT64(X) ( (GLint64) (9223372036854775807.0 * (double)(X)) )
+
/** Convert GLint in [-2147483648,2147483647] to GLfloat in [-1.0,1.0], texture/fb data */
#define INT_TO_FLOAT_TEX(I) ((I) == -2147483648 ? -1.0F : (I) * (1.0F/2147483647.0))