static inline int
util_ifloor(float f)
{
+#if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
+ /*
+ * IEEE floor for computers that round to nearest or even.
+ * 'f' must be between -4194304 and 4194303.
+ * This floor operation is done by "(iround(f + .5) + iround(f - .5)) >> 1",
+ * but uses some IEEE specific tricks for better speed.
+ * Contributed by Josh Vanderhoof
+ */
+ int ai, bi;
+ double af, bf;
+ af = (3 << 22) + 0.5 + (double)f;
+ bf = (3 << 22) + 0.5 - (double)f;
+ /* GCC generates an extra fstp/fld without this. */
+ __asm__ ("fstps %0" : "=m" (ai) : "t" (af) : "st");
+ __asm__ ("fstps %0" : "=m" (bi) : "t" (bf) : "st");
+ return (ai - bi) >> 1;
+#else
int ai, bi;
double af, bf;
union fi u;
u.f = (float) af; ai = u.i;
u.f = (float) bf; bi = u.i;
return (ai - bi) >> 1;
+#endif
}
*/
#define CLAMP( X, MIN, MAX ) ( (X)>(MIN) ? ((X)>(MAX) ? (MAX) : (X)) : (MIN) )
+/* Syntax sugar occuring frequently in graphics code */
+#define SATURATE( X ) CLAMP(X, 0.0f, 1.0f)
+
#define MIN2( A, B ) ( (A)<(B) ? (A) : (B) )
#define MAX2( A, B ) ( (A)>(B) ? (A) : (B) )
#define MAX4( A, B, C, D ) ((A) > (B) ? MAX3(A, C, D) : MAX3(B, C, D))
+/**
+ * Align a value up to an alignment value
+ *
+ * If \c value is not already aligned to the requested alignment value, it
+ * will be rounded up.
+ *
+ * \param value Value to be rounded
+ * \param alignment Alignment value to be used. This must be a power of two.
+ *
+ * \sa ROUND_DOWN_TO()
+ */
+static inline uintptr_t
+ALIGN(uintptr_t value, int32_t alignment)
+{
+ assert(util_is_power_of_two_nonzero(alignment));
+ return (((value) + (alignment) - 1) & ~((alignment) - 1));
+}
+
+/**
+ * Like ALIGN(), but works with a non-power-of-two alignment.
+ */
+static inline uintptr_t
+ALIGN_NPOT(uintptr_t value, int32_t alignment)
+{
+ assert(alignment > 0);
+ return (value + alignment - 1) / alignment * alignment;
+}
+
+/**
+ * Align a value down to an alignment value
+ *
+ * If \c value is not already aligned to the requested alignment value, it
+ * will be rounded down.
+ *
+ * \param value Value to be rounded
+ * \param alignment Alignment value to be used. This must be a power of two.
+ *
+ * \sa ALIGN()
+ */
+static inline uintptr_t
+ROUND_DOWN_TO(uintptr_t value, int32_t alignment)
+{
+ assert(util_is_power_of_two_nonzero(alignment));
+ return ((value) & ~(alignment - 1));
+}
+
/**
* Align a value, only works pot alignemnts.
*/
void
util_fpstate_set(unsigned fpstate);
-
+/**
+ * For indexed draw calls, return true if the vertex count to be drawn is
+ * much lower than the vertex count that has to be uploaded, meaning
+ * that the driver should flatten indices instead of trying to upload
+ * a too big range.
+ *
+ * This is used by vertex upload code in u_vbuf and glthread.
+ */
+static inline bool
+util_is_vbo_upload_ratio_too_large(unsigned draw_vertex_count,
+ unsigned upload_vertex_count)
+{
+ if (draw_vertex_count > 1024)
+ return upload_vertex_count > draw_vertex_count * 4;
+ else if (draw_vertex_count > 32)
+ return upload_vertex_count > draw_vertex_count * 8;
+ else
+ return upload_vertex_count > draw_vertex_count * 16;
+}
#ifdef __cplusplus
}