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Make the "predator" effect match original more closely.
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@OmniBlade
OmniBlade committed Jun 14, 2024
1 parent 6233416 commit 1a56231
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Showing 3 changed files with 66 additions and 23 deletions.
85 changes: 64 additions & 21 deletions common/keybuff.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
// distributed with this program. You should have received a copy of the
// GNU General Public License along with permitted additional restrictions
// with this program. If not, see https://github.com/electronicarts/CnC_Remastered_Collection
#include "debugstring.h"
#include "graphicsviewport.h"
#include "keyframe.h"
#include "shape.h"
Expand All @@ -29,7 +30,10 @@ extern bool OriginalUseBigShapeBuffer;
// with the value PredTable[PredFrame] pixels away if PartialCount
// is greater than or equal to 256. After every pixel, it is increased by
// PartialPred and reset to % 256 after reaching 256 or greater.
static const short PredTable[8] = {1, 3, 2, 5, 2, 3, 4, 1};
static const short PredNegTable[8] = {-1, -3, -2, -5, -2, -3, -4, -1};
static short PredNegOffTable[8] = {0, 0, 0, 0, 0, 0, 0, 0};
static const short PredPosTable[8] = {1, 3, 2, 5, 2, 3, 4, 1};
static const short* PredTable = PredPosTable;
static unsigned PredFrame;
static unsigned PartialCount;
static unsigned PartialPred;
Expand Down Expand Up @@ -172,14 +176,17 @@ void BF_Fading(int width,
{
while (height--) {
for (int i = width; i > 0; --i) {
unsigned char sbyte = *src;
unsigned char sbyte = *src++;

for (int i = 0; i < count; ++i) {
sbyte = fade_tab[sbyte];
}

*dst++ = sbyte;
}

src += src_pitch;
dst += dst_pitch;
}
}

Expand Down Expand Up @@ -298,22 +305,19 @@ void BF_Predator(int width,
for (int i = width; i > 0; --i) {
PartialCount += PartialPred;

// if ( PartialCount & 0xFF00 ) {
// PartialCount &= 0xFFFF00FF;
if (PartialCount >= 256) {
PartialCount %= 256;

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
*dst = dst[PredTable[PredFrame]];
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

++dst;
}

src += src_pitch + width;
dst += dst_pitch;
}
}
Expand All @@ -340,9 +344,11 @@ void BF_Predator_Trans(int width,

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
sbyte = dst[PredTable[PredFrame]];
} else {
sbyte = *dst;
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

*dst = sbyte;
Expand Down Expand Up @@ -377,9 +383,11 @@ void BF_Predator_Ghost(int width,

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
sbyte = dst[PredTable[PredFrame]];
} else {
sbyte = *dst;
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

unsigned char fbyte = ghost_lookup[sbyte];
Expand Down Expand Up @@ -418,9 +426,11 @@ void BF_Predator_Ghost_Trans(int width,

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
sbyte = dst[PredTable[PredFrame]];
} else {
sbyte = *dst;
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

unsigned char fbyte = ghost_lookup[sbyte];
Expand Down Expand Up @@ -461,9 +471,11 @@ void BF_Predator_Fading(int width,

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
sbyte = dst[PredTable[PredFrame]];
} else {
sbyte = *dst;
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

for (int i = 0; i < count; ++i) {
Expand Down Expand Up @@ -497,9 +509,11 @@ void BF_Predator_Fading_Trans(int width,

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
sbyte = dst[PredTable[PredFrame]];
} else {
sbyte = *dst;
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

for (int i = 0; i < count; ++i) {
Expand Down Expand Up @@ -539,9 +553,11 @@ void BF_Predator_Ghost_Fading(int width,

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
sbyte = dst[PredTable[PredFrame]];
} else {
sbyte = *dst;
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

unsigned char fbyte = ghost_lookup[sbyte];
Expand Down Expand Up @@ -585,9 +601,11 @@ void BF_Predator_Ghost_Fading_Trans(int width,

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
sbyte = dst[PredTable[PredFrame]];
} else {
sbyte = *dst;
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

unsigned char fbyte = ghost_lookup[sbyte];
Expand Down Expand Up @@ -858,7 +876,7 @@ void Single_Line_Predator(int width,
*dst = dst[PredTable[PredFrame]];
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

++dst;
Expand All @@ -883,9 +901,11 @@ void Single_Line_Predator_Trans(int width,

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
sbyte = dst[PredTable[PredFrame]];
} else {
sbyte = *dst;
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

*dst = sbyte;
Expand All @@ -912,9 +932,11 @@ void Single_Line_Predator_Ghost(int width,

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
sbyte = dst[PredTable[PredFrame]];
} else {
sbyte = *dst;
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

unsigned char fbyte = ghost_lookup[sbyte];
Expand Down Expand Up @@ -945,9 +967,11 @@ void Single_Line_Predator_Ghost_Trans(int width,

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
sbyte = dst[PredTable[PredFrame]];
} else {
sbyte = *dst;
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

unsigned char fbyte = ghost_lookup[sbyte];
Expand Down Expand Up @@ -980,9 +1004,11 @@ void Single_Line_Predator_Fading(int width,

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
sbyte = dst[PredTable[PredFrame]];
} else {
sbyte = *dst;
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

for (int i = 0; i < count; ++i) {
Expand Down Expand Up @@ -1011,9 +1037,11 @@ void Single_Line_Predator_Fading_Trans(int width,

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
sbyte = dst[PredTable[PredFrame]];
} else {
sbyte = *dst;
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

for (int i = 0; i < count; ++i) {
Expand Down Expand Up @@ -1045,9 +1073,11 @@ void Single_Line_Predator_Ghost_Fading(int width,

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
sbyte = dst[PredTable[PredFrame]];
} else {
sbyte = *dst;
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

unsigned char fbyte = ghost_lookup[sbyte];
Expand Down Expand Up @@ -1083,9 +1113,11 @@ void Single_Line_Predator_Ghost_Fading_Trans(int width,

if (&dst[PredTable[PredFrame]] < PredatorLimit) {
sbyte = dst[PredTable[PredFrame]];
} else {
sbyte = *dst;
}

PredFrame = (PredFrame + 2) % 8;
PredFrame = (PredFrame + 1) % 8;
}

unsigned char fbyte = ghost_lookup[sbyte];
Expand Down Expand Up @@ -1302,6 +1334,17 @@ void Buffer_Frame_To_Page(int x,
int current_frame = va_arg(ap, unsigned);
blit_style |= 8;

if (current_frame < 0) {

for (int i = 0; i < 8; ++i) {
PredNegOffTable[i] =
PredNegTable[i] + viewport.Get_XAdd() + viewport.Get_Width() + viewport.Get_Pitch();
}
PredTable = PredNegOffTable;
} else {
PredTable = PredPosTable;
}

PredFrame = ((unsigned)current_frame) % 8;
PartialCount = 0;
PartialPred = 256;
Expand Down
2 changes: 1 addition & 1 deletion redalert/conquer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3139,7 +3139,7 @@ void CC_Draw_Shape(void const* shapefile,

predoffset = Frame;

if (x > WindowList[window][WINDOWWIDTH]) {
if (x > WindowList[window][WINDOWWIDTH] >> 1) {
predoffset = -predoffset;
}

Expand Down
2 changes: 1 addition & 1 deletion tiberiandawn/conquer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2687,7 +2687,7 @@ void CC_Draw_Shape(void const* shapefile,

predoffset = Frame;

if (x > WindowList[window][WINDOWWIDTH]) {
if (x > WindowList[window][WINDOWWIDTH] >> 1) {
predoffset = -predoffset;
}

Expand Down

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