ref: c151f95b68a8500612a49768cec1648c02562779
dir: /src/scopes/ft2_scopedraw.c/
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <math.h>
#include "../ft2_config.h"
#include "../ft2_video.h"
#include "../ft2_palette.h"
#include "ft2_scopes.h"
#include "ft2_scopedraw.h"
#include "ft2_scope_macros.h"
static int16_t *scopeIntrpLUT;
static void scopeLine(int32_t x1, int32_t y1, int32_t y2, const uint32_t color);
bool calcScopeIntrpLUT(void)
{
scopeIntrpLUT = (int16_t *)malloc(SCOPE_INTRP_WIDTH * SCOPE_INTRP_PHASES * sizeof (int16_t));
if (scopeIntrpLUT == NULL)
return false;
/* Several tests have been done to figure out what interpolation method is most suitable
** for the tracker scopes. After testing linear, cubic, Gaussian and windowed-sinc
** interpolation, I have come to the conclusion that 4-point cubic B-spline is the best.
** This interpolation method also has no overshoot.
*/
// 4-point cubic B-spline (no overshoot)
int16_t *ptr16 = scopeIntrpLUT;
for (int32_t i = 0; i < SCOPE_INTRP_PHASES; i++)
{
const double x1 = i * (1.0 / SCOPE_INTRP_PHASES);
const double x2 = x1 * x1; // x^2
const double x3 = x2 * x1; // x^3
double t1 = (-(1.0/6.0) * x3) + ( (1.0/2.0) * x2) + (-(1.0/2.0) * x1) + (1.0/6.0);
double t2 = ( (1.0/2.0) * x3) + ( -1.0 * x2) + (2.0/3.0);
double t3 = (-(1.0/2.0) * x3) + ( (1.0/2.0) * x2) + ( (1.0/2.0) * x1) + (1.0/6.0);
double t4 = (1.0/6.0) * x3;
// truncate, do not round!
*ptr16++ = (int16_t)(t1 * SCOPE_INTRP_SCALE);
*ptr16++ = (int16_t)(t2 * SCOPE_INTRP_SCALE);
*ptr16++ = (int16_t)(t3 * SCOPE_INTRP_SCALE);
*ptr16++ = (int16_t)(t4 * SCOPE_INTRP_SCALE);
}
return true;
}
void freeScopeIntrpLUT(void)
{
if (scopeIntrpLUT != NULL)
{
free(scopeIntrpLUT);
scopeIntrpLUT = NULL;
}
}
/* ----------------------------------------------------------------------- */
/* NON-LINED SCOPE DRAWING ROUTINES */
/* ----------------------------------------------------------------------- */
static void scopeDrawNoLoop_8bit(scope_t *s, uint32_t x, uint32_t lineY, uint32_t w)
{
SCOPE_INIT
for (; x < width; x++)
{
SCOPE_GET_SMP8
SCOPE_DRAW_SMP
SCOPE_UPDATE_READPOS
SCOPE_HANDLE_POS_NO_LOOP
}
}
static void scopeDrawLoop_8bit(scope_t *s, uint32_t x, uint32_t lineY, uint32_t w)
{
SCOPE_INIT
for (; x < width; x++)
{
SCOPE_GET_SMP8
SCOPE_DRAW_SMP
SCOPE_UPDATE_READPOS
SCOPE_HANDLE_POS_LOOP
}
}
static void scopeDrawBidiLoop_8bit(scope_t *s, uint32_t x, uint32_t lineY, uint32_t w)
{
SCOPE_INIT_BIDI
for (; x < width; x++)
{
SCOPE_GET_SMP8_BIDI
SCOPE_DRAW_SMP
SCOPE_UPDATE_READPOS
SCOPE_HANDLE_POS_BIDI
}
}
static void scopeDrawNoLoop_16bit(scope_t *s, uint32_t x, uint32_t lineY, uint32_t w)
{
SCOPE_INIT
for (; x < width; x++)
{
SCOPE_GET_SMP16
SCOPE_DRAW_SMP
SCOPE_UPDATE_READPOS
SCOPE_HANDLE_POS_NO_LOOP
}
}
static void scopeDrawLoop_16bit(scope_t *s, uint32_t x, uint32_t lineY, uint32_t w)
{
SCOPE_INIT
for (; x < width; x++)
{
SCOPE_GET_SMP16
SCOPE_DRAW_SMP
SCOPE_UPDATE_READPOS
SCOPE_HANDLE_POS_LOOP
}
}
static void scopeDrawBidiLoop_16bit(scope_t *s, uint32_t x, uint32_t lineY, uint32_t w)
{
SCOPE_INIT_BIDI
for (; x < width; x++)
{
SCOPE_GET_SMP16_BIDI
SCOPE_DRAW_SMP
SCOPE_UPDATE_READPOS
SCOPE_HANDLE_POS_BIDI
}
}
/* ----------------------------------------------------------------------- */
/* LINED SCOPE DRAWING ROUTINES */
/* ----------------------------------------------------------------------- */
static void linedScopeDrawNoLoop_8bit(scope_t *s, uint32_t x, uint32_t lineY, uint32_t w)
{
LINED_SCOPE_INIT
LINED_SCOPE_PREPARE_SMP8
SCOPE_HANDLE_POS_NO_LOOP
for (; x < width; x++)
{
SCOPE_GET_INTERPOLATED_SMP8
LINED_SCOPE_DRAW_SMP
SCOPE_UPDATE_READPOS
SCOPE_HANDLE_POS_NO_LOOP
}
}
static void linedScopeDrawLoop_8bit(scope_t *s, uint32_t x, uint32_t lineY, uint32_t w)
{
LINED_SCOPE_INIT
LINED_SCOPE_PREPARE_SMP8_LOOP
SCOPE_HANDLE_POS_LOOP
for (; x < width; x++)
{
SCOPE_GET_INTERPOLATED_SMP8_LOOP
LINED_SCOPE_DRAW_SMP
SCOPE_UPDATE_READPOS
SCOPE_HANDLE_POS_LOOP
}
}
static void linedScopeDrawBidiLoop_8bit(scope_t *s, uint32_t x, uint32_t lineY, uint32_t w)
{
LINED_SCOPE_INIT_BIDI
LINED_SCOPE_PREPARE_SMP8_BIDI
SCOPE_HANDLE_POS_BIDI
for (; x < width; x++)
{
SCOPE_GET_INTERPOLATED_SMP8_BIDI
LINED_SCOPE_DRAW_SMP
SCOPE_UPDATE_READPOS
SCOPE_HANDLE_POS_BIDI
}
}
static void linedScopeDrawNoLoop_16bit(scope_t *s, uint32_t x, uint32_t lineY, uint32_t w)
{
LINED_SCOPE_INIT
LINED_SCOPE_PREPARE_SMP16
SCOPE_HANDLE_POS_NO_LOOP
for (; x < width; x++)
{
SCOPE_GET_INTERPOLATED_SMP16
LINED_SCOPE_DRAW_SMP
SCOPE_UPDATE_READPOS
SCOPE_HANDLE_POS_NO_LOOP
}
}
static void linedScopeDrawLoop_16bit(scope_t *s, uint32_t x, uint32_t lineY, uint32_t w)
{
LINED_SCOPE_INIT
LINED_SCOPE_PREPARE_SMP16_LOOP
SCOPE_HANDLE_POS_LOOP
for (; x < width; x++)
{
SCOPE_GET_INTERPOLATED_SMP16_LOOP
LINED_SCOPE_DRAW_SMP
SCOPE_UPDATE_READPOS
SCOPE_HANDLE_POS_LOOP
}
}
static void linedScopeDrawBidiLoop_16bit(scope_t *s, uint32_t x, uint32_t lineY, uint32_t w)
{
LINED_SCOPE_INIT_BIDI
LINED_SCOPE_PREPARE_SMP16_BIDI
SCOPE_HANDLE_POS_BIDI
for (; x < width; x++)
{
SCOPE_GET_INTERPOLATED_SMP16_BIDI
LINED_SCOPE_DRAW_SMP
SCOPE_UPDATE_READPOS
SCOPE_HANDLE_POS_BIDI
}
}
// -----------------------------------------------------------------------
static void scopeLine(int32_t x1, int32_t y1, int32_t y2, const uint32_t color)
{
#ifdef _DEBUG
if (x1 < 0 || x1 >= SCREEN_W || y1 < 0 || y1 >= SCREEN_H || y2 < 0 || y2 >= SCREEN_H)
return;
#endif
uint32_t *dst32 = &video.frameBuffer[(y1 * SCREEN_W) + x1];
*dst32 = color; // set first pixel
const int32_t dy = y2 - y1;
if (dy == 0) // y1 == y2
{
dst32[1] = color;
return;
}
uint32_t ay = ABS(dy);
int32_t d = 1 - ay;
ay <<= 1;
if (y1 > y2)
{
for (; y1 != y2; y1--)
{
if (d >= 0)
{
d -= ay;
dst32++;
}
d += 2;
dst32 -= SCREEN_W;
*dst32 = color;
}
}
else
{
for (; y1 != y2; y1++)
{
if (d >= 0)
{
d -= ay;
dst32++;
}
d += 2;
dst32 += SCREEN_W;
*dst32 = color;
}
}
}
// -----------------------------------------------------------------------
const scopeDrawRoutine scopeDrawRoutineTable[12] =
{
(scopeDrawRoutine)scopeDrawNoLoop_8bit,
(scopeDrawRoutine)scopeDrawLoop_8bit,
(scopeDrawRoutine)scopeDrawBidiLoop_8bit,
(scopeDrawRoutine)scopeDrawNoLoop_16bit,
(scopeDrawRoutine)scopeDrawLoop_16bit,
(scopeDrawRoutine)scopeDrawBidiLoop_16bit,
(scopeDrawRoutine)linedScopeDrawNoLoop_8bit,
(scopeDrawRoutine)linedScopeDrawLoop_8bit,
(scopeDrawRoutine)linedScopeDrawBidiLoop_8bit,
(scopeDrawRoutine)linedScopeDrawNoLoop_16bit,
(scopeDrawRoutine)linedScopeDrawLoop_16bit,
(scopeDrawRoutine)linedScopeDrawBidiLoop_16bit
};