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gallium: additional comments, fix typos, etc

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This commit is contained in:
Brian Paul 2008-03-21 10:38:56 -06:00
parent 23c98f618b
commit 403c7ba91a
1 changed files with 23 additions and 8 deletions
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31
src/gallium/include/pipe/p_format.h
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@ -38,13 +38,14 @@ extern "C" {
#endif
/**
* The PIPE_FORMAT is a 32-bit wide bitfield that encodes all the information
* needed to uniquely describe a pixel format.
* The pipe_format enum is a 32-bit wide bitfield that encodes all the
* information needed to uniquely describe a pixel format.
*/
/**
* Possible format layouts -- occupy first 2 bits. The interpretation of
* the remaining 30 bits depends on a particual format layout.
* Possible format layouts are encoded in the first 2 bits.
* The interpretation of the remaining 30 bits depends on a particular
* format layout.
*/
#define PIPE_FORMAT_LAYOUT_RGBAZS 0
#define PIPE_FORMAT_LAYOUT_YCBCR 1
@ -286,6 +287,7 @@ enum pipe_format {
/**
* Unsigned 8-bit stencil format.
* XXX should remove this, but S8_UNORM is a poor name
*/
#define PIPE_FORMAT_U_S8 PIPE_FORMAT_S8_UNORM
@ -294,11 +296,12 @@ enum pipe_format {
/**
* Builds pipe format name from format token.
*/
static INLINE char *pf_sprint_name( char *str, uint format )
static INLINE char *pf_sprint_name( char *str, enum pipe_format format )
{
strcpy( str, "PIPE_FORMAT_" );
switch (pf_layout( format )) {
case PIPE_FORMAT_LAYOUT_RGBAZS: {
case PIPE_FORMAT_LAYOUT_RGBAZS:
{
pipe_format_rgbazs_t rgbazs = (pipe_format_rgbazs_t) format;
uint i;
uint scale = 1 << (pf_exp8( rgbazs ) * 3);
@ -362,7 +365,8 @@ static INLINE char *pf_sprint_name( char *str, uint format )
}
}
break;
case PIPE_FORMAT_LAYOUT_YCBCR: {
case PIPE_FORMAT_LAYOUT_YCBCR:
{
pipe_format_ycbcr_t ycbcr = (pipe_format_ycbcr_t) format;
strcat( str, "YCBCR" );
@ -375,6 +379,10 @@ static INLINE char *pf_sprint_name( char *str, uint format )
return str;
}
/**
* Return bits for a particular component.
* \param comp component index, starting at 0
*/
static INLINE uint pf_get_component_bits( enum pipe_format format, uint comp )
{
uint size;
@ -397,6 +405,9 @@ static INLINE uint pf_get_component_bits( enum pipe_format format, uint comp )
return size << (pf_exp8(format) * 3);
}
/**
* Return total bits needed for the pixel format.
*/
static INLINE uint pf_get_bits( enum pipe_format format )
{
if (pf_layout(format) == PIPE_FORMAT_LAYOUT_RGBAZS) {
@ -417,7 +428,11 @@ static INLINE uint pf_get_bits( enum pipe_format format )
}
}
static INLINE uint pf_get_size( enum pipe_format format ) {
/**
* Return bytes per pixel for the given format.
*/
static INLINE uint pf_get_size( enum pipe_format format )
{
assert(pf_get_bits(format) % 8 == 0);
return pf_get_bits(format) / 8;
}