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authorBrian Paul <brianp@vmware.com>2009-02-27 22:26:18 -0700
committerBrian Paul <brianp@vmware.com>2009-02-28 09:35:16 -0700
commit389d50baff8234fdf4d7bcddeb09658d7d17012d (patch)
tree5c42e1fa06522db8c5d4dcd8af6f6f916a685d6c /src/mesa/swrast
parent8bf25a17d2f8f888e8e8a4f7a2c6d68c6c06f6e8 (diff)
mesa: move GLfixed type and related macros to swrast module
Fixed point is only used in swrast and sw-based drivers.
Diffstat (limited to 'src/mesa/swrast')
-rw-r--r--src/mesa/swrast/s_context.h28
-rw-r--r--src/mesa/swrast/swrast.h6
2 files changed, 34 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_context.h b/src/mesa/swrast/s_context.h
index cdd6fa5048..6e8d080704 100644
--- a/src/mesa/swrast/s_context.h
+++ b/src/mesa/swrast/s_context.h
@@ -289,6 +289,34 @@ swrast_render_finish(GLcontext *ctx)
/*
+ * Fixed point arithmetic macros
+ */
+#ifndef FIXED_FRAC_BITS
+#define FIXED_FRAC_BITS 11
+#endif
+
+#define FIXED_SHIFT FIXED_FRAC_BITS
+#define FIXED_ONE (1 << FIXED_SHIFT)
+#define FIXED_HALF (1 << (FIXED_SHIFT-1))
+#define FIXED_FRAC_MASK (FIXED_ONE - 1)
+#define FIXED_INT_MASK (~FIXED_FRAC_MASK)
+#define FIXED_EPSILON 1
+#define FIXED_SCALE ((float) FIXED_ONE)
+#define FIXED_DBL_SCALE ((double) FIXED_ONE)
+#define FloatToFixed(X) (IROUND((X) * FIXED_SCALE))
+#define FixedToDouble(X) ((X) * (1.0 / FIXED_DBL_SCALE))
+#define IntToFixed(I) ((I) << FIXED_SHIFT)
+#define FixedToInt(X) ((X) >> FIXED_SHIFT)
+#define FixedToUns(X) (((unsigned int)(X)) >> FIXED_SHIFT)
+#define FixedCeil(X) (((X) + FIXED_ONE - FIXED_EPSILON) & FIXED_INT_MASK)
+#define FixedFloor(X) ((X) & FIXED_INT_MASK)
+#define FixedToFloat(X) ((X) * (1.0F / FIXED_SCALE))
+#define PosFloatToFixed(X) FloatToFixed(X)
+#define SignedFloatToFixed(X) FloatToFixed(X)
+
+
+
+/*
* XXX these macros are just bandages for now in order to make
* CHAN_BITS==32 compile cleanly.
* These should probably go elsewhere at some point.
diff --git a/src/mesa/swrast/swrast.h b/src/mesa/swrast/swrast.h
index 047f7991e6..015f8a05c3 100644
--- a/src/mesa/swrast/swrast.h
+++ b/src/mesa/swrast/swrast.h
@@ -75,6 +75,12 @@ typedef struct {
} SWvertex;
+/**
+ * Fixed point data type.
+ */
+typedef int GLfixed;
+
+
#define FRAG_ATTRIB_CI FRAG_ATTRIB_COL0