2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
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21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 * Implement the effect of glColorMask and glIndexMask in software.
31 #include "main/glheader.h"
32 #include "main/macros.h"
34 #include "s_context.h"
35 #include "s_masking.h"
40 * Apply the color mask to a span of rgba values.
43 _swrast_mask_rgba_span(GLcontext
*ctx
, struct gl_renderbuffer
*rb
,
46 const GLuint n
= span
->end
;
49 ASSERT(n
< MAX_WIDTH
);
50 ASSERT(span
->arrayMask
& SPAN_RGBA
);
51 ASSERT(rb
->DataType
== span
->array
->ChanType
);
53 rbPixels
= _swrast_get_dest_rgba(ctx
, rb
, span
);
56 * Do component masking.
57 * Note that we're not using span->array->mask[] here. We could...
59 if (span
->array
->ChanType
== GL_UNSIGNED_BYTE
) {
60 /* treat 4xGLubyte as 1xGLuint */
61 const GLuint srcMask
= *((GLuint
*) ctx
->Color
.ColorMask
);
62 const GLuint dstMask
= ~srcMask
;
63 const GLuint
*dst
= (const GLuint
*) rbPixels
;
64 GLuint
*src
= (GLuint
*) span
->array
->rgba8
;
66 for (i
= 0; i
< n
; i
++) {
67 src
[i
] = (src
[i
] & srcMask
) | (dst
[i
] & dstMask
);
70 else if (span
->array
->ChanType
== GL_UNSIGNED_SHORT
) {
71 /* 2-byte components */
72 /* XXX try to use 64-bit arithmetic someday */
73 const GLushort rMask
= ctx
->Color
.ColorMask
[RCOMP
] ? 0xffff : 0x0;
74 const GLushort gMask
= ctx
->Color
.ColorMask
[GCOMP
] ? 0xffff : 0x0;
75 const GLushort bMask
= ctx
->Color
.ColorMask
[BCOMP
] ? 0xffff : 0x0;
76 const GLushort aMask
= ctx
->Color
.ColorMask
[ACOMP
] ? 0xffff : 0x0;
77 const GLushort (*dst
)[4] = (const GLushort (*)[4]) rbPixels
;
78 GLushort (*src
)[4] = span
->array
->rgba16
;
80 for (i
= 0; i
< n
; i
++) {
81 src
[i
][RCOMP
] = (src
[i
][RCOMP
] & rMask
) | (dst
[i
][RCOMP
] & ~rMask
);
82 src
[i
][GCOMP
] = (src
[i
][GCOMP
] & gMask
) | (dst
[i
][GCOMP
] & ~gMask
);
83 src
[i
][BCOMP
] = (src
[i
][BCOMP
] & bMask
) | (dst
[i
][BCOMP
] & ~bMask
);
84 src
[i
][ACOMP
] = (src
[i
][ACOMP
] & aMask
) | (dst
[i
][ACOMP
] & ~aMask
);
88 /* 4-byte components */
89 const GLuint rMask
= ctx
->Color
.ColorMask
[RCOMP
] ? ~0x0 : 0x0;
90 const GLuint gMask
= ctx
->Color
.ColorMask
[GCOMP
] ? ~0x0 : 0x0;
91 const GLuint bMask
= ctx
->Color
.ColorMask
[BCOMP
] ? ~0x0 : 0x0;
92 const GLuint aMask
= ctx
->Color
.ColorMask
[ACOMP
] ? ~0x0 : 0x0;
93 const GLuint (*dst
)[4] = (const GLuint (*)[4]) rbPixels
;
94 GLuint (*src
)[4] = (GLuint (*)[4]) span
->array
->attribs
[FRAG_ATTRIB_COL0
];
96 for (i
= 0; i
< n
; i
++) {
97 src
[i
][RCOMP
] = (src
[i
][RCOMP
] & rMask
) | (dst
[i
][RCOMP
] & ~rMask
);
98 src
[i
][GCOMP
] = (src
[i
][GCOMP
] & gMask
) | (dst
[i
][GCOMP
] & ~gMask
);
99 src
[i
][BCOMP
] = (src
[i
][BCOMP
] & bMask
) | (dst
[i
][BCOMP
] & ~bMask
);
100 src
[i
][ACOMP
] = (src
[i
][ACOMP
] & aMask
) | (dst
[i
][ACOMP
] & ~aMask
);
107 * Apply the index mask to a span of color index values.
110 _swrast_mask_ci_span(GLcontext
*ctx
, struct gl_renderbuffer
*rb
,
113 const GLuint srcMask
= ctx
->Color
.IndexMask
;
114 const GLuint dstMask
= ~srcMask
;
115 GLuint
*index
= span
->array
->index
;
116 GLuint dest
[MAX_WIDTH
];
119 ASSERT(span
->arrayMask
& SPAN_INDEX
);
120 ASSERT(span
->end
<= MAX_WIDTH
);
121 ASSERT(rb
->DataType
== GL_UNSIGNED_INT
);
123 if (span
->arrayMask
& SPAN_XY
) {
124 _swrast_get_values(ctx
, rb
, span
->end
, span
->array
->x
, span
->array
->y
,
125 dest
, sizeof(GLuint
));
128 _swrast_read_index_span(ctx
, rb
, span
->end
, span
->x
, span
->y
, dest
);
131 for (i
= 0; i
< span
->end
; i
++) {
132 index
[i
] = (index
[i
] & srcMask
) | (dest
[i
] & dstMask
);