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SwapBufferEndianness.

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This commit is contained in:
jussi
2024-12-15 18:38:07 +02:00
parent b4b81f68c4
commit 5ff5a37137
7 changed files with 112 additions and 18 deletions
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114
src/core.c
View File

@@ -24,6 +24,38 @@ void unloadBuffer( Buffer* buffer ) {
TraceLog( LOG_INFO, "BUFFER: Unloaded buffer with %u bytes of data", buffer->size );
}
/* Byte swaps. */
static uint16_t swapU16( uint16_t val ) {
return (val << 8) | (val >> 8 );
}
static int16_t swapS16( int16_t val ) {
return (val << 8) | ( (val >> 8) & 0xFF);
}
static uint32_t swapU32( uint32_t val ) {
val = ( (val << 8) & 0xFF00FF00 ) | ( (val >> 8) & 0xFF00FF );
return (val << 16) | (val >> 16);
}
static int32_t swapS32( int32_t val ) {
val = ( (val << 8) & 0xFF00FF00) | ( (val >> 8) & 0xFF00FF );
return (val << 16) | ( (val >> 16) & 0xFFFF);
}
static uint64_t swapU64( uint64_t val ) {
val = ( (val << 8) & 0xFF00FF00FF00FF00ULL ) | ( (val >> 8) & 0x00FF00FF00FF00FFULL );
val = ( (val << 16) & 0xFFFF0000FFFF0000ULL ) | ( (val >> 16) & 0x0000FFFF0000FFFFULL );
return (val << 32) | (val >> 32);
}
static int64_t swapS64( int64_t val ) {
val = ( (val << 8) & 0xFF00FF00FF00FF00ULL ) | ( (val >> 8) & 0x00FF00FF00FF00FFULL );
val = ( (val << 16) & 0xFFFF0000FFFF0000ULL ) | ( (val >> 16) & 0x0000FFFF0000FFFFULL );
return (val << 32) | ( (val >> 32) & 0xFFFFFFFFULL);
}
/*
## Core - Window-related functions
*/
@@ -3834,6 +3866,69 @@ int lcoreSetBufferData( lua_State* L ) {
return 0;
}
/*
> RL.SwapBufferEndianness( Buffer buffer )
Swap buffer endianness from big endian to little endian and vice versa
*/
int lcoreSwapBufferEndianness( lua_State* L ) {
Buffer* buffer = uluaGetBuffer( L, 1 );
size_t elementSize = getBufferElementSize( buffer );
size_t bufLen = buffer->size / elementSize;
if ( buffer->type == BUFFER_UNSIGNED_SHORT ) {
unsigned short *p = buffer->data;
for ( int i = 0; i < bufLen; i++ ) {
*p = swapU16( *p );
p++;
}
}
else if ( buffer->type == BUFFER_UNSIGNED_INT ) {
unsigned int *p = buffer->data;
for ( int i = 0; i < bufLen; i++ ) {
*p = swapU32( *p );
p++;
}
}
else if ( buffer->type == BUFFER_SHORT ) {
short *p = buffer->data;
for ( int i = 0; i < bufLen; i++ ) {
*p = swapS16( *p );
p++;
}
}
else if ( buffer->type == BUFFER_INT ) {
int *p = buffer->data;
for ( int i = 0; i < bufLen; i++ ) {
*p = swapS32( *p );
p++;
}
}
else if ( buffer->type == BUFFER_FLOAT ) {
float *p = buffer->data;
for ( int i = 0; i < bufLen; i++ ) {
*p = swapU32( *p );
p++;
}
}
else if ( buffer->type == BUFFER_DOUBLE ) {
double *p = buffer->data;
for ( int i = 0; i < bufLen; i++ ) {
*p = swapU64( *p );
p++;
}
}
return 0;
}
/*
> data = RL.GetBufferData( Buffer buffer, int position, int length )
@@ -3846,10 +3941,11 @@ int lcoreGetBufferData( lua_State* L ) {
size_t position = luaL_checkinteger( L, 2 );
size_t length = luaL_checkinteger( L, 3 );
size_t bufLen = buffer->size / getBufferElementSize( buffer );
size_t count = bufLen < ( position + length ) ? ( position + length ) - bufLen : length;
if ( buffer->type == BUFFER_UNSIGNED_CHAR ) {
unsigned char* p = buffer->data + position * sizeof( unsigned char );
size_t bufLen = buffer->size / sizeof( unsigned char );
size_t count = bufLen < ( position + length ) ? ( position + length ) - bufLen : length;
lua_createtable( L, count, 0 );
for ( int i = 0; i < count; i++ ) {
@@ -3860,8 +3956,6 @@ int lcoreGetBufferData( lua_State* L ) {
}
else if ( buffer->type == BUFFER_UNSIGNED_SHORT ) {
unsigned short *p = buffer->data + position * sizeof( unsigned short );
size_t bufLen = buffer->size / sizeof( unsigned short );
size_t count = bufLen < ( position + length ) ? ( position + length ) - bufLen : length;
lua_createtable( L, count, 0 );
for ( int i = 0; i < count; i++ ) {
@@ -3872,8 +3966,6 @@ int lcoreGetBufferData( lua_State* L ) {
}
else if ( buffer->type == BUFFER_UNSIGNED_INT ) {
unsigned int* p = buffer->data + position * sizeof( unsigned int );
size_t bufLen = buffer->size / sizeof( unsigned int );
size_t count = bufLen < ( position + length ) ? ( position + length ) - bufLen : length;
lua_createtable( L, count, 0 );
for ( int i = 0; i < count; i++ ) {
@@ -3884,8 +3976,6 @@ int lcoreGetBufferData( lua_State* L ) {
}
else if ( buffer->type == BUFFER_CHAR ) {
char* p = buffer->data + position * sizeof( char );
size_t bufLen = buffer->size / sizeof( char );
size_t count = bufLen < ( position + length ) ? ( position + length ) - bufLen : length;
lua_createtable( L, count, 0 );
for ( int i = 0; i < count; i++ ) {
@@ -3896,8 +3986,6 @@ int lcoreGetBufferData( lua_State* L ) {
}
else if ( buffer->type == BUFFER_SHORT ) {
short *p = buffer->data + position * sizeof( short );
size_t bufLen = buffer->size / sizeof( short );
size_t count = bufLen < ( position + length ) ? ( position + length ) - bufLen : length;
lua_createtable( L, count, 0 );
for ( int i = 0; i < count; i++ ) {
@@ -3908,8 +3996,6 @@ int lcoreGetBufferData( lua_State* L ) {
}
else if ( buffer->type == BUFFER_INT ) {
int* p = buffer->data + position * sizeof( int );
size_t bufLen = buffer->size / sizeof( int );
size_t count = bufLen < ( position + length ) ? ( position + length ) - bufLen : length;
lua_createtable( L, count, 0 );
for ( int i = 0; i < count; i++ ) {
@@ -3920,8 +4006,6 @@ int lcoreGetBufferData( lua_State* L ) {
}
else if ( buffer->type == BUFFER_FLOAT ) {
float* p = buffer->data + position * sizeof( float );
size_t bufLen = buffer->size / sizeof( float );
size_t count = bufLen < ( position + length ) ? ( position + length ) - bufLen : length;
lua_createtable( L, count, 0 );
for ( int i = 0; i < count; i++ ) {
@@ -3932,8 +4016,6 @@ int lcoreGetBufferData( lua_State* L ) {
}
else if ( buffer->type == BUFFER_DOUBLE ) {
double* p = buffer->data + position * sizeof( double );
size_t bufLen = buffer->size / sizeof( double );
size_t count = bufLen < ( position + length ) ? ( position + length ) - bufLen : length;
lua_createtable( L, count, 0 );
for ( int i = 0; i < count; i++ ) {

1
src/lua_core.c
View File

@@ -1775,6 +1775,7 @@ void luaRegister() {
assingGlobalFunction( "UnloadBuffer", lcoreUnloadBuffer );
assingGlobalFunction( "CopyBufferData", lcoreCopyBufferData );
assingGlobalFunction( "SetBufferData", lcoreSetBufferData );
assingGlobalFunction( "SwapBufferEndianness", lcoreSwapBufferEndianness );
assingGlobalFunction( "GetBufferData", lcoreGetBufferData );
assingGlobalFunction( "GetBufferAsString", lcoreGetBufferAsString );
assingGlobalFunction( "GetBufferType", lcoreGetBufferType );