Merge pull request #1847 from libretro/arcadez2003-patch-11

Namco rollback 10

src/sound/filter.h

@@ -53,64 +53,4 @@ static INLINE void filter_insert(filter* f, filter_state* s, filter_real x) {
 /* Compute the filter output */
 filter_real filter_compute(filter* f, filter_state* s);
 
-
-/* Filter types */
-#define FILTER_LOWPASS		0
-#define FILTER_HIGHPASS		1
-#define FILTER_BANDPASS		2
-
-#define Q_TO_DAMP(q)	(1.0/q)
-
-
-struct filter2_context
-{
-	double x0, x1, x2;	/* x[k], x[k-1], x[k-2], current and previous 2 input values */
-	double y0, y1, y2;	/* y[k], y[k-1], y[k-2], current and previous 2 output values */
-	double a1, a2;		/* digital filter coefficients, denominator */
-	double b0, b1, b2;	/* digital filter coefficients, numerator */
-};
-
-
-/* Setup the filter context based on the passed filter type info.
- * type - 1 of the 3 defined filter types
- * fc   - center frequency
- * d    - damp = 1/Q
- * gain - overall filter gain. Set to 1 if not needed.
- */
-void filter2_setup(int type, double fc, double d, double gain,
-					struct filter2_context *filter);
-
-
-/* Reset the input/output voltages to 0. */
-void filter2_reset(struct filter2_context *filter);
-
-
-/* Step the filter.
- * x0 is the new input, which needs to be set before stepping.
- * y0 is the new filter output.
- */
-void filter2_step(struct filter2_context *filter);
-
-
-/* Setup a filter2 structure based on an op-amp multipole bandpass circuit.
- * NOTE: If r2 is not used then set to 0.
- *       vRef is not needed to setup filter.
- *
- *                             .--------+---------.
- *                             |        |         |
- *                            --- c1    Z         |
- *                            ---       Z r3      |
- *                             |        Z         |
- *            r1               |  c2    |  |\     |
- *   In >----ZZZZ----+---------+--||----+  | \    |
- *                   Z                  '--|- \   |
- *                   Z r2                  |   >--+------> out
- *                   Z                  .--|+ /
- *                   |                  |  | /
- *                  gnd        vRef >---'  |/
- *
- */
-void filter_opamp_m_bandpass_setup(double r1, double r2, double r3, double c1, double c2,
-					struct filter2_context *filter);
-
 #endif