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/*
* gldgBitfield.c
*
* OpenGL Graph Display bitfield utility module implementation
*
* Written by: Shawn Taras
*/
#include <stdlib.h>
#include <math.h>
#include <GL/gl.h>
#include "glgd.h"
/*
* External public functions
*/
GLboolean
glgdBitfieldInit(glgdBitfield *bits)
{
if (bits != NULL)
{
return glgdBitfieldClear(bits);
}
return GL_FALSE;
}
GLboolean
glgdBitfieldFini(glgdBitfield *bits)
{
return glgdBitfieldInit(bits);
}
GLboolean
glgdBitfieldClear(glgdBitfield *bits)
{
int i;
if (bits != NULL)
{
for (i=0; i<GLGDBITFIELD_BYTE_COUNT; i++)
{
bits->bits[i] = 0x00;
}
return GL_TRUE;
}
return GL_FALSE;
}
GLboolean
glgdBitfieldSet(glgdBitfield *bits, int bitNdx)
{
int byteNdx;
GLubyte mask;
if (bits != NULL && bitNdx >= 0 && bitNdx < GLGDBITFIELD_BIT_COUNT)
{
byteNdx = bitNdx / GLGDBITFIELD_BITS_PER_BYTE;
mask = 0x1 << (bitNdx % GLGDBITFIELD_BITS_PER_BYTE);
if ((bits->bits[byteNdx] & mask) == 0x00)
{
bits->bits[byteNdx] |= mask;
/* Only return GL_TRUE if it was actually set! */
return GL_TRUE;
}
}
return GL_FALSE;
}
GLboolean
glgdBitfieldToggle(glgdBitfield *bits, int bitNdx)
{
int byteNdx;
GLubyte mask;
if (bits != NULL && bitNdx >= 0 && bitNdx < GLGDBITFIELD_BIT_COUNT)
{
byteNdx = bitNdx / GLGDBITFIELD_BITS_PER_BYTE;
mask = 0x1 << (bitNdx % GLGDBITFIELD_BITS_PER_BYTE);
bits->bits[byteNdx] ^= mask;
return GL_TRUE;
}
return GL_FALSE;
}
GLboolean
glgdBitfieldReset(glgdBitfield *bits, int bitNdx)
{
int byteNdx;
GLubyte mask;
if (bits != NULL && bitNdx >= 0 && bitNdx < GLGDBITFIELD_BIT_COUNT)
{
byteNdx = bitNdx / GLGDBITFIELD_BITS_PER_BYTE;
mask = 0x1 << (bitNdx % GLGDBITFIELD_BITS_PER_BYTE);
if (bits->bits[byteNdx] & mask)
{
bits->bits[byteNdx] &= ~mask;
/* Only return GL_TRUE if it was actually reset! */
return GL_TRUE;
}
}
return GL_FALSE;
}
GLboolean
glgdBitfieldIsSet(glgdBitfield *bits, int bitNdx)
{
int byteNdx;
GLubyte mask;
if (bits != NULL && bitNdx >= 0 && bitNdx < GLGDBITFIELD_BIT_COUNT)
{
byteNdx = bitNdx / GLGDBITFIELD_BITS_PER_BYTE;
mask = 0x1 << (bitNdx % GLGDBITFIELD_BITS_PER_BYTE);
if (bits->bits[byteNdx] & mask)
{
return GL_TRUE;
}
}
return GL_FALSE;
}
GLboolean
glgdBitfieldCompare(glgdBitfield *a, glgdBitfield *b)
{
int i;
if (a && b)
{
for (i=0; i<GLGDBITFIELD_BYTE_COUNT; i++)
{
if (a->bits[i] & b->bits[i])
{
/* Something matches! */
return GL_TRUE;
}
}
}
return GL_FALSE;
}
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