ref: f56d9f67013745d4c5cde1e4ce6d5f95bee8997c
dir: /src/scopes/ft2_scope_macros.h/
#pragma once
#include <stdint.h>
#include "ft2_scopes.h"
/* ----------------------------------------------------------------------- */
/* SCOPE DRAWING MACROS */
/* ----------------------------------------------------------------------- */
#define SCOPE_REGS_NO_LOOP \
const int32_t volume = s->volume; \
const int32_t sampleEnd = s->sampleEnd; \
const uint32_t delta = (uint32_t)(s->delta >> (SCOPE_FRAC_BITS-10)); \
const uint32_t color = video.palette[PAL_PATTEXT]; \
const uint32_t width = x + w; \
int32_t sample; \
int32_t position = s->position; \
uint32_t positionFrac = 0;
#define SCOPE_REGS_LOOP \
const int32_t volume = s->volume; \
const int32_t sampleEnd = s->sampleEnd; \
const int32_t loopStart = s->loopStart; \
const int32_t loopLength = s->loopLength; \
const uint32_t delta = (uint32_t)(s->delta >> (SCOPE_FRAC_BITS-10)); \
const uint32_t color = video.palette[PAL_PATTEXT]; \
const uint32_t width = x + w; \
int32_t sample; \
int32_t position = s->position; \
uint32_t positionFrac = 0;
#define SCOPE_REGS_PINGPONG \
const int32_t volume = s->volume; \
const int32_t sampleEnd = s->sampleEnd; \
const int32_t loopStart = s->loopStart; \
const int32_t loopLength = s->loopLength; \
const uint32_t delta = (uint32_t)(s->delta >> (SCOPE_FRAC_BITS-10)); \
const uint32_t color = video.palette[PAL_PATTEXT]; \
const uint32_t width = x + w; \
int32_t sample; \
int32_t position = s->position; \
uint32_t positionFrac = 0; \
int32_t direction = s->direction;
#define LINED_SCOPE_REGS_NO_LOOP \
const int32_t volume = s->volume; \
const int32_t sampleEnd = s->sampleEnd; \
const uint32_t delta = (uint32_t)(s->delta >> (SCOPE_FRAC_BITS-10)); \
const uint32_t width = (x + w) - 1; \
int32_t sample, sample2; \
int32_t y1, y2; \
int32_t position = s->position; \
uint32_t positionFrac = 0;
#define LINED_SCOPE_REGS_LOOP \
const int32_t volume = s->volume; \
const int32_t sampleEnd = s->sampleEnd; \
const int32_t loopStart = s->loopStart; \
const int32_t loopLength = s->loopLength; \
const uint32_t delta = (uint32_t)(s->delta >> (SCOPE_FRAC_BITS-10)); \
const uint32_t width = (x + w) - 1; \
int32_t sample, sample2; \
int32_t y1, y2; \
int32_t position = s->position; \
uint32_t positionFrac = 0;
#define LINED_SCOPE_REGS_PINGPONG \
const int32_t volume = s->volume; \
const int32_t sampleEnd = s->sampleEnd; \
const int32_t loopStart = s->loopStart; \
const int32_t loopLength = s->loopLength; \
const uint32_t delta = (uint32_t)(s->delta >> (SCOPE_FRAC_BITS-10)); \
const uint32_t width = (x + w) - 1; \
int32_t sample, sample2; \
int32_t y1, y2; \
int32_t position = s->position; \
uint32_t positionFrac = 0; \
int32_t direction = s->direction;
/* Note: Sample data already has a fixed tap samples at the end of the sample,
** so that an out-of-bounds read is OK and reads the correct interpolation tap.
*/
#define COLLECT_LERP_SAMPLES8 \
sample = s->base8[position+0] << 8; \
sample2 = s->base8[position+1] << 8;
#define COLLECT_LERP_SAMPLES16 \
sample = s->base16[position+0]; \
sample2 = s->base16[position+1];
#define DO_LERP \
const int32_t frac = (uint32_t)positionFrac >> 1; /* 0..32767 */ \
sample2 -= sample; \
sample2 = (sample2 * frac) >> 15; \
sample += sample2; \
#define DO_LERP_BIDI \
int32_t frac = (uint32_t)positionFrac >> 1; /* 0..32767 */ \
if (direction == -1) frac ^= 32767; /* negate frac */ \
sample2 -= sample; \
sample2 = (sample2 * frac) >> 15; \
sample += sample2;
#define GET_LERP_SMP8 \
COLLECT_LERP_SAMPLES8 \
DO_LERP
#define GET_LERP_SMP16 \
COLLECT_LERP_SAMPLES16 \
DO_LERP
#define GET_LERP_SMP8_BIDI \
COLLECT_LERP_SAMPLES8 \
DO_LERP_BIDI
#define GET_LERP_SMP16_BIDI \
COLLECT_LERP_SAMPLES16 \
DO_LERP_BIDI
#define SCOPE_GET_SMP8 \
if (s->active) \
sample = (s->base8[position] * volume) >> 8; \
else \
sample = 0;
#define SCOPE_GET_SMP16 \
if (s->active) \
sample = (s->base16[position] * volume) >> 16; \
else \
sample = 0;
#define SCOPE_GET_LERP_SMP8 \
if (s->active) \
{ \
GET_LERP_SMP8 \
sample = (sample * volume) >> 16; \
} \
else \
{ \
sample = 0; \
}
#define SCOPE_GET_LERP_SMP16 \
if (s->active) \
{ \
GET_LERP_SMP16 \
sample = (sample * volume) >> 16; \
} \
else \
{ \
sample = 0; \
}
#define SCOPE_GET_LERP_SMP8_BIDI \
if (s->active) \
{ \
GET_LERP_SMP8_BIDI \
sample = (sample * volume) >> 16; \
} \
else \
{ \
sample = 0; \
}
#define SCOPE_GET_LERP_SMP16_BIDI \
if (s->active) \
{ \
GET_LERP_SMP16_BIDI \
sample = (sample * volume) >> 16; \
} \
else \
{ \
sample = 0; \
}
#define SCOPE_UPDATE_DRAWPOS \
positionFrac += delta; \
position += positionFrac >> 16; \
positionFrac &= 0xFFFF;
#define SCOPE_UPDATE_DRAWPOS_PINGPONG \
positionFrac += delta; \
position += (int32_t)(positionFrac >> 16) * direction; \
positionFrac &= 0xFFFF;
#define SCOPE_DRAW_SMP \
video.frameBuffer[((lineY - sample) * SCREEN_W) + x] = color;
#define LINED_SCOPE_PREPARE_LERP_SMP8 \
SCOPE_GET_LERP_SMP8 \
y1 = lineY - sample; \
SCOPE_UPDATE_DRAWPOS
#define LINED_SCOPE_PREPARE_LERP_SMP16 \
SCOPE_GET_LERP_SMP16 \
y1 = lineY - sample; \
SCOPE_UPDATE_DRAWPOS
#define LINED_SCOPE_PREPARE_LERP_SMP8_BIDI \
SCOPE_GET_LERP_SMP8_BIDI \
y1 = lineY - sample; \
SCOPE_UPDATE_DRAWPOS
#define LINED_SCOPE_PREPARE_LERP_SMP16_BIDI \
SCOPE_GET_LERP_SMP16_BIDI \
y1 = lineY - sample; \
SCOPE_UPDATE_DRAWPOS
#define LINED_SCOPE_DRAW_SMP \
y2 = lineY - sample; \
scopeLine(x, y1, y2); \
y1 = y2; \
#define SCOPE_HANDLE_POS_NO_LOOP \
if (position >= sampleEnd) \
s->active = false;
#define SCOPE_HANDLE_POS_LOOP \
if (position >= sampleEnd) \
{ \
if (loopLength >= 2) \
position = loopStart + ((position - sampleEnd) % loopLength); \
else \
position = loopStart; \
}
#define SCOPE_HANDLE_POS_PINGPONG \
if (direction == -1 && position < loopStart) \
{ \
direction = 1; /* change direction to forwards */ \
\
if (loopLength >= 2) \
position = loopStart + ((loopStart - position - 1) % loopLength); \
else \
position = loopStart; \
} \
else if (position >= sampleEnd) \
{ \
direction = -1; /* change direction to backwards */ \
\
if (loopLength >= 2) \
position = (sampleEnd - 1) - ((position - sampleEnd) % loopLength); \
else \
position = sampleEnd - 1; \
}