2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
5 * Copyright (C) 2009-2010 VMware, Inc. All Rights Reserved.
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28 * \file pixeltransfer.c
29 * Pixel transfer operations (scale, bias, table lookups, etc)
35 #include "pixeltransfer.h"
41 * Apply scale and bias factors to an array of RGBA pixels.
44 _mesa_scale_and_bias_rgba(GLuint n
, GLfloat rgba
[][4],
45 GLfloat rScale
, GLfloat gScale
,
46 GLfloat bScale
, GLfloat aScale
,
47 GLfloat rBias
, GLfloat gBias
,
48 GLfloat bBias
, GLfloat aBias
)
50 if (rScale
!= 1.0 || rBias
!= 0.0) {
52 for (i
= 0; i
< n
; i
++) {
53 rgba
[i
][RCOMP
] = rgba
[i
][RCOMP
] * rScale
+ rBias
;
56 if (gScale
!= 1.0 || gBias
!= 0.0) {
58 for (i
= 0; i
< n
; i
++) {
59 rgba
[i
][GCOMP
] = rgba
[i
][GCOMP
] * gScale
+ gBias
;
62 if (bScale
!= 1.0 || bBias
!= 0.0) {
64 for (i
= 0; i
< n
; i
++) {
65 rgba
[i
][BCOMP
] = rgba
[i
][BCOMP
] * bScale
+ bBias
;
68 if (aScale
!= 1.0 || aBias
!= 0.0) {
70 for (i
= 0; i
< n
; i
++) {
71 rgba
[i
][ACOMP
] = rgba
[i
][ACOMP
] * aScale
+ aBias
;
78 * Apply pixel mapping to an array of floating point RGBA pixels.
81 _mesa_map_rgba( const struct gl_context
*ctx
, GLuint n
, GLfloat rgba
[][4] )
83 const GLfloat rscale
= (GLfloat
) (ctx
->PixelMaps
.RtoR
.Size
- 1);
84 const GLfloat gscale
= (GLfloat
) (ctx
->PixelMaps
.GtoG
.Size
- 1);
85 const GLfloat bscale
= (GLfloat
) (ctx
->PixelMaps
.BtoB
.Size
- 1);
86 const GLfloat ascale
= (GLfloat
) (ctx
->PixelMaps
.AtoA
.Size
- 1);
87 const GLfloat
*rMap
= ctx
->PixelMaps
.RtoR
.Map
;
88 const GLfloat
*gMap
= ctx
->PixelMaps
.GtoG
.Map
;
89 const GLfloat
*bMap
= ctx
->PixelMaps
.BtoB
.Map
;
90 const GLfloat
*aMap
= ctx
->PixelMaps
.AtoA
.Map
;
93 GLfloat r
= CLAMP(rgba
[i
][RCOMP
], 0.0F
, 1.0F
);
94 GLfloat g
= CLAMP(rgba
[i
][GCOMP
], 0.0F
, 1.0F
);
95 GLfloat b
= CLAMP(rgba
[i
][BCOMP
], 0.0F
, 1.0F
);
96 GLfloat a
= CLAMP(rgba
[i
][ACOMP
], 0.0F
, 1.0F
);
97 rgba
[i
][RCOMP
] = rMap
[F_TO_I(r
* rscale
)];
98 rgba
[i
][GCOMP
] = gMap
[F_TO_I(g
* gscale
)];
99 rgba
[i
][BCOMP
] = bMap
[F_TO_I(b
* bscale
)];
100 rgba
[i
][ACOMP
] = aMap
[F_TO_I(a
* ascale
)];
105 * Map color indexes to float rgba values.
108 _mesa_map_ci_to_rgba( const struct gl_context
*ctx
, GLuint n
,
109 const GLuint index
[], GLfloat rgba
[][4] )
111 GLuint rmask
= ctx
->PixelMaps
.ItoR
.Size
- 1;
112 GLuint gmask
= ctx
->PixelMaps
.ItoG
.Size
- 1;
113 GLuint bmask
= ctx
->PixelMaps
.ItoB
.Size
- 1;
114 GLuint amask
= ctx
->PixelMaps
.ItoA
.Size
- 1;
115 const GLfloat
*rMap
= ctx
->PixelMaps
.ItoR
.Map
;
116 const GLfloat
*gMap
= ctx
->PixelMaps
.ItoG
.Map
;
117 const GLfloat
*bMap
= ctx
->PixelMaps
.ItoB
.Map
;
118 const GLfloat
*aMap
= ctx
->PixelMaps
.ItoA
.Map
;
121 rgba
[i
][RCOMP
] = rMap
[index
[i
] & rmask
];
122 rgba
[i
][GCOMP
] = gMap
[index
[i
] & gmask
];
123 rgba
[i
][BCOMP
] = bMap
[index
[i
] & bmask
];
124 rgba
[i
][ACOMP
] = aMap
[index
[i
] & amask
];
130 _mesa_scale_and_bias_depth(const struct gl_context
*ctx
, GLuint n
,
131 GLfloat depthValues
[])
133 const GLfloat scale
= ctx
->Pixel
.DepthScale
;
134 const GLfloat bias
= ctx
->Pixel
.DepthBias
;
136 for (i
= 0; i
< n
; i
++) {
137 GLfloat d
= depthValues
[i
] * scale
+ bias
;
138 depthValues
[i
] = CLAMP(d
, 0.0F
, 1.0F
);
144 _mesa_scale_and_bias_depth_uint(const struct gl_context
*ctx
, GLuint n
,
145 GLuint depthValues
[])
147 const GLdouble max
= (double) 0xffffffff;
148 const GLdouble scale
= ctx
->Pixel
.DepthScale
;
149 const GLdouble bias
= ctx
->Pixel
.DepthBias
* max
;
151 for (i
= 0; i
< n
; i
++) {
152 GLdouble d
= (GLdouble
) depthValues
[i
] * scale
+ bias
;
153 d
= CLAMP(d
, 0.0, max
);
154 depthValues
[i
] = (GLuint
) d
;
159 * Apply various pixel transfer operations to an array of RGBA pixels
160 * as indicated by the transferOps bitmask
163 _mesa_apply_rgba_transfer_ops(struct gl_context
*ctx
, GLbitfield transferOps
,
164 GLuint n
, GLfloat rgba
[][4])
167 if (transferOps
& IMAGE_SCALE_BIAS_BIT
) {
168 _mesa_scale_and_bias_rgba(n
, rgba
,
169 ctx
->Pixel
.RedScale
, ctx
->Pixel
.GreenScale
,
170 ctx
->Pixel
.BlueScale
, ctx
->Pixel
.AlphaScale
,
171 ctx
->Pixel
.RedBias
, ctx
->Pixel
.GreenBias
,
172 ctx
->Pixel
.BlueBias
, ctx
->Pixel
.AlphaBias
);
174 /* color map lookup */
175 if (transferOps
& IMAGE_MAP_COLOR_BIT
) {
176 _mesa_map_rgba( ctx
, n
, rgba
);
179 /* clamping to [0,1] */
180 if (transferOps
& IMAGE_CLAMP_BIT
) {
182 for (i
= 0; i
< n
; i
++) {
183 rgba
[i
][RCOMP
] = CLAMP(rgba
[i
][RCOMP
], 0.0F
, 1.0F
);
184 rgba
[i
][GCOMP
] = CLAMP(rgba
[i
][GCOMP
], 0.0F
, 1.0F
);
185 rgba
[i
][BCOMP
] = CLAMP(rgba
[i
][BCOMP
], 0.0F
, 1.0F
);
186 rgba
[i
][ACOMP
] = CLAMP(rgba
[i
][ACOMP
], 0.0F
, 1.0F
);
193 * Apply color index shift and offset to an array of pixels.
196 _mesa_shift_and_offset_ci(const struct gl_context
*ctx
,
197 GLuint n
, GLuint indexes
[])
199 GLint shift
= ctx
->Pixel
.IndexShift
;
200 GLint offset
= ctx
->Pixel
.IndexOffset
;
204 indexes
[i
] = (indexes
[i
] << shift
) + offset
;
207 else if (shift
< 0) {
210 indexes
[i
] = (indexes
[i
] >> shift
) + offset
;
215 indexes
[i
] = indexes
[i
] + offset
;
223 * Apply color index shift, offset and table lookup to an array
227 _mesa_apply_ci_transfer_ops(const struct gl_context
*ctx
,
228 GLbitfield transferOps
,
229 GLuint n
, GLuint indexes
[])
231 if (transferOps
& IMAGE_SHIFT_OFFSET_BIT
) {
232 _mesa_shift_and_offset_ci(ctx
, n
, indexes
);
234 if (transferOps
& IMAGE_MAP_COLOR_BIT
) {
235 const GLuint mask
= ctx
->PixelMaps
.ItoI
.Size
- 1;
237 for (i
= 0; i
< n
; i
++) {
238 const GLuint j
= indexes
[i
] & mask
;
239 indexes
[i
] = F_TO_I(ctx
->PixelMaps
.ItoI
.Map
[j
]);
246 * Apply stencil index shift, offset and table lookup to an array
250 _mesa_apply_stencil_transfer_ops(const struct gl_context
*ctx
, GLuint n
,
253 if (ctx
->Pixel
.IndexShift
!= 0 || ctx
->Pixel
.IndexOffset
!= 0) {
254 const GLint offset
= ctx
->Pixel
.IndexOffset
;
255 GLint shift
= ctx
->Pixel
.IndexShift
;
258 for (i
= 0; i
< n
; i
++) {
259 stencil
[i
] = (stencil
[i
] << shift
) + offset
;
262 else if (shift
< 0) {
264 for (i
= 0; i
< n
; i
++) {
265 stencil
[i
] = (stencil
[i
] >> shift
) + offset
;
269 for (i
= 0; i
< n
; i
++) {
270 stencil
[i
] = stencil
[i
] + offset
;
274 if (ctx
->Pixel
.MapStencilFlag
) {
275 GLuint mask
= ctx
->PixelMaps
.StoS
.Size
- 1;
277 for (i
= 0; i
< n
; i
++) {
278 stencil
[i
] = (GLubyte
) ctx
->PixelMaps
.StoS
.Map
[ stencil
[i
] & mask
];