diff options
author | Michel Dänzer <michel@tungstengraphics.com> | 2007-11-06 10:17:59 +0100 |
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committer | Michel Dänzer <michel@tungstengraphics.com> | 2007-11-06 10:17:59 +0100 |
commit | 4f79dbd5aa6b8a955ac9dcc43cf0852acd89a320 (patch) | |
tree | efdfe816ff252e2151971a8474f4b8563fa2ea8f /src/mesa | |
parent | 0ab2c84ce95cea5c72aa4e9680862bf82d31259d (diff) |
Convert format bitfields to shifts and masks.
The memory layout of bitfields depends on the ABI.
Diffstat (limited to 'src/mesa')
-rw-r--r-- | src/mesa/pipe/p_format.h | 63 | ||||
-rw-r--r-- | src/mesa/state_tracker/st_format.c | 51 |
2 files changed, 52 insertions, 62 deletions
diff --git a/src/mesa/pipe/p_format.h b/src/mesa/pipe/p_format.h index 89d83a44f5..d478a6c58d 100644 --- a/src/mesa/pipe/p_format.h +++ b/src/mesa/pipe/p_format.h @@ -42,11 +42,10 @@ #define PIPE_FORMAT_LAYOUT_RGBAZS 0 #define PIPE_FORMAT_LAYOUT_YCBCR 1 -struct pipe_format_header +static INLINE uint pf_layout(uint f) /**< PIPE_FORMAT_LAYOUT_ */ { - uint layout : 2; /**< PIPE_FORMAT_LAYOUT_ */ - uint padding : 30; -}; + return f & 0x3; +} /** * RGBAZS Format Layout. @@ -75,16 +74,14 @@ struct pipe_format_header #define PIPE_FORMAT_TYPE_SSCALED 5 /** - * In a nutshell, this bitfield contains instructions how to unpack - * a given format to a full-blown 4-component vector suitable for FS. * Because the destination vector is assumed to be RGBA FLOAT, we * need to know how to swizzle and expand components from the source * vector. - * Let's take U_A1_R5_G5_B5 as an example. SwizzleX is A, sizeX + * Let's take U_A1_R5_G5_B5 as an example. X swizzle is A, X size * is 1 bit and type is UNORM. So we take the most significant bit * from source vector, convert 0 to 0.0 and 1 to 1.0 and save it * in the last component of the destination RGBA component. - * Next, swizzleY is R, sizeY is 5 and type is UNORM. We normalize + * Next, Y swizzle is R, Y size is 5 and type is UNORM. We normalize * those 5 bits into [0.0; 1.0] range and put it into second * component of the destination vector. Rinse and repeat for * components Z and W. @@ -93,21 +90,23 @@ struct pipe_format_header * If any swizzle is 0 or 1, the corresponding destination component * should be filled with 0.0 and 1.0, respectively. */ -struct pipe_format_rgbazs +typedef uint pipe_format_rgbazs_t; + +static INLINE uint pf_get(pipe_format_rgbazs_t f, uint shift, uint mask) { - uint layout : 2; /**< PIPE_FORMAT_LAYOUT_RGBAZS */ - uint swizzleX : 3; /**< PIPE_FORMAT_COMP_ */ - uint swizzleY : 3; /**< PIPE_FORMAT_COMP_ */ - uint swizzleZ : 3; /**< PIPE_FORMAT_COMP_ */ - uint swizzleW : 3; /**< PIPE_FORMAT_COMP_ */ - uint sizeX : 3; /**< Size of X - 1 */ - uint sizeY : 3; /**< Size of Y - 1 */ - uint sizeZ : 3; /**< Size of Z - 1 */ - uint sizeW : 3; /**< Size of W - 1 */ - uint exp8 : 2; /**< Scale size by 8 ^ exp8 */ - uint type : 3; /**< PIPE_FORMAT_TYPE_ */ - uint padding : 1; -}; + return (f >> shift) & mask; +} + +#define pf_swizzle_x(f) pf_get(f, 2, 0x7) /**< PIPE_FORMAT_COMP_ */ +#define pf_swizzle_y(f) pf_get(f, 5, 0x7) /**< PIPE_FORMAT_COMP_ */ +#define pf_swizzle_z(f) pf_get(f, 8, 0x7) /**< PIPE_FORMAT_COMP_ */ +#define pf_swizzle_w(f) pf_get(f, 11, 0x7) /**< PIPE_FORMAT_COMP_ */ +#define pf_size_x(f) pf_get(f, 14, 0x7) /**< Size of X - 1 */ +#define pf_size_y(f) pf_get(f, 17, 0x7) /**< Size of Y - 1 */ +#define pf_size_z(f) pf_get(f, 20, 0x7) /**< Size of Z - 1 */ +#define pf_size_w(f) pf_get(f, 23, 0x7) /**< Size of W - 1 */ +#define pf_exp8(f) pf_get(f, 26, 0x3) /**< Scale size by 8 ^ exp8 */ +#define pf_type(f) pf_get(f, 28, 0xf) /**< PIPE_FORMAT_TYPE_ */ /** * Helper macro to encode the above structure into a 32-bit value. @@ -179,15 +178,10 @@ struct pipe_format_rgbazs */ /** - * This bitfields is simple. It only contains a flag that indicates whether the - * format is reversed or not. + * This only contains a flag that indicates whether the format is reversed or + * not. */ -struct pipe_format_ycbcr -{ - uint layout : 2; /**< PIPE_FORMAT_LAYOUT_YCBCR */ - uint reversed : 1; - uint padding : 29; -}; +typedef uint pipe_format_ycbcr_t; /** * Helper macro to encode the above structure into a 32-bit value. @@ -196,13 +190,10 @@ struct pipe_format_ycbcr (PIPE_FORMAT_LAYOUT_YCBCR << 0) |\ ((REV) << 2) ) -union pipe_format +static INLINE uint pf_rev(pipe_format_ycbcr_t f) { - uint value32; - struct pipe_format_header header; - struct pipe_format_rgbazs rgbazs; - struct pipe_format_ycbcr ycbcr; -}; + return (f >> 2) & 0x1; +} /** * Texture/surface image formats (preliminary) diff --git a/src/mesa/state_tracker/st_format.c b/src/mesa/state_tracker/st_format.c index d5e8581b21..e9839e2936 100644 --- a/src/mesa/state_tracker/st_format.c +++ b/src/mesa/state_tracker/st_format.c @@ -45,32 +45,32 @@ static GLuint format_bits( - struct pipe_format_rgbazs info, + pipe_format_rgbazs_t info, GLuint comp ) { GLuint size; - if (info.swizzleX == comp) { - size = info.sizeX; + if (pf_swizzle_x(info) == comp) { + size = pf_size_x(info); } - else if (info.swizzleY == comp) { - size = info.sizeY; + else if (pf_swizzle_y(info) == comp) { + size = pf_size_y(info); } - else if (info.swizzleZ == comp) { - size = info.sizeZ; + else if (pf_swizzle_z(info) == comp) { + size = pf_size_z(info); } - else if (info.swizzleW == comp) { - size = info.sizeW; + else if (pf_swizzle_w(info) == comp) { + size = pf_size_w(info); } else { size = 0; } - return size << (info.exp8 * 3); + return size << (pf_exp8(info) * 3); } static GLuint format_max_bits( - struct pipe_format_rgbazs info ) + pipe_format_rgbazs_t info ) { GLuint size = format_bits( info, PIPE_FORMAT_COMP_R ); @@ -84,7 +84,7 @@ format_max_bits( static GLuint format_size( - struct pipe_format_rgbazs info ) + pipe_format_rgbazs_t info ) { return format_bits( info, PIPE_FORMAT_COMP_R ) + @@ -103,13 +103,10 @@ st_get_format_info( GLuint format, struct pipe_format_info *pinfo ) { - union pipe_format fmt; + if (pf_layout(format) == PIPE_FORMAT_LAYOUT_RGBAZS) { + pipe_format_rgbazs_t info; - fmt.value32 = format; - if (fmt.header.layout == PIPE_FORMAT_LAYOUT_RGBAZS) { - struct pipe_format_rgbazs info; - - info = fmt.rgbazs; + info = format; #if 0 printf( @@ -129,20 +126,20 @@ st_get_format_info( size = format_max_bits( info ); if (size == 8) { - if (info.type == PIPE_FORMAT_TYPE_UNORM) + if (pf_type(info) == PIPE_FORMAT_TYPE_UNORM) pinfo->datatype = GL_UNSIGNED_BYTE; else pinfo->datatype = GL_BYTE; } else if (size == 16) { - if (info.type == PIPE_FORMAT_TYPE_UNORM) + if (pf_type(info) == PIPE_FORMAT_TYPE_UNORM) pinfo->datatype = GL_UNSIGNED_SHORT; else pinfo->datatype = GL_SHORT; } else { assert( size <= 32 ); - if (info.type == PIPE_FORMAT_TYPE_UNORM) + if (pf_type(info) == PIPE_FORMAT_TYPE_UNORM) pinfo->datatype = GL_UNSIGNED_INT; else pinfo->datatype = GL_INT; @@ -161,8 +158,10 @@ st_get_format_info( pinfo->size = format_size( info ) / 8; /* Luminance & Intensity bits */ - if( info.swizzleX == PIPE_FORMAT_COMP_R && info.swizzleY == PIPE_FORMAT_COMP_R && info.swizzleZ == PIPE_FORMAT_COMP_R ) { - if( info.swizzleW == PIPE_FORMAT_COMP_R ) { + if( pf_swizzle_x(info) == PIPE_FORMAT_COMP_R && + pf_swizzle_y(info) == PIPE_FORMAT_COMP_R && + pf_swizzle_z(info) == PIPE_FORMAT_COMP_R ) { + if( pf_swizzle_w(info) == PIPE_FORMAT_COMP_R ) { pinfo->luminance_bits = 0; pinfo->intensity_bits = pinfo->red_bits; } @@ -190,11 +189,11 @@ st_get_format_info( } } else { - struct pipe_format_ycbcr info; + pipe_format_ycbcr_t info; - assert( fmt.header.layout == PIPE_FORMAT_LAYOUT_YCBCR ); + assert( pf_layout(format) == PIPE_FORMAT_LAYOUT_YCBCR ); - info = fmt.ycbcr; + info = format; /* TODO */ assert( 0 ); |