1/*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
5 * Copyright (C) 2009-2010  VMware, Inc.  All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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.
23 */
24
25
26/**
27 * \file pixeltransfer.c
28 * Pixel transfer operations (scale, bias, table lookups, etc)
29 */
30
31
32#include "glheader.h"
33#include "colormac.h"
34#include "pixeltransfer.h"
35#include "imports.h"
36#include "mtypes.h"
37
38
39/*
40 * Apply scale and bias factors to an array of RGBA pixels.
41 */
42void
43_mesa_scale_and_bias_rgba(GLuint n, GLfloat rgba[][4],
44                          GLfloat rScale, GLfloat gScale,
45                          GLfloat bScale, GLfloat aScale,
46                          GLfloat rBias, GLfloat gBias,
47                          GLfloat bBias, GLfloat aBias)
48{
49   if (rScale != 1.0 || rBias != 0.0) {
50      GLuint i;
51      for (i = 0; i < n; i++) {
52         rgba[i][RCOMP] = rgba[i][RCOMP] * rScale + rBias;
53      }
54   }
55   if (gScale != 1.0 || gBias != 0.0) {
56      GLuint i;
57      for (i = 0; i < n; i++) {
58         rgba[i][GCOMP] = rgba[i][GCOMP] * gScale + gBias;
59      }
60   }
61   if (bScale != 1.0 || bBias != 0.0) {
62      GLuint i;
63      for (i = 0; i < n; i++) {
64         rgba[i][BCOMP] = rgba[i][BCOMP] * bScale + bBias;
65      }
66   }
67   if (aScale != 1.0 || aBias != 0.0) {
68      GLuint i;
69      for (i = 0; i < n; i++) {
70         rgba[i][ACOMP] = rgba[i][ACOMP] * aScale + aBias;
71      }
72   }
73}
74
75
76/*
77 * Apply pixel mapping to an array of floating point RGBA pixels.
78 */
79void
80_mesa_map_rgba( const struct gl_context *ctx, GLuint n, GLfloat rgba[][4] )
81{
82   const GLfloat rscale = (GLfloat) (ctx->PixelMaps.RtoR.Size - 1);
83   const GLfloat gscale = (GLfloat) (ctx->PixelMaps.GtoG.Size - 1);
84   const GLfloat bscale = (GLfloat) (ctx->PixelMaps.BtoB.Size - 1);
85   const GLfloat ascale = (GLfloat) (ctx->PixelMaps.AtoA.Size - 1);
86   const GLfloat *rMap = ctx->PixelMaps.RtoR.Map;
87   const GLfloat *gMap = ctx->PixelMaps.GtoG.Map;
88   const GLfloat *bMap = ctx->PixelMaps.BtoB.Map;
89   const GLfloat *aMap = ctx->PixelMaps.AtoA.Map;
90   GLuint i;
91   for (i=0;i<n;i++) {
92      GLfloat r = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
93      GLfloat g = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
94      GLfloat b = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
95      GLfloat a = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
96      rgba[i][RCOMP] = rMap[F_TO_I(r * rscale)];
97      rgba[i][GCOMP] = gMap[F_TO_I(g * gscale)];
98      rgba[i][BCOMP] = bMap[F_TO_I(b * bscale)];
99      rgba[i][ACOMP] = aMap[F_TO_I(a * ascale)];
100   }
101}
102
103/*
104 * Map color indexes to float rgba values.
105 */
106void
107_mesa_map_ci_to_rgba( const struct gl_context *ctx, GLuint n,
108                      const GLuint index[], GLfloat rgba[][4] )
109{
110   GLuint rmask = ctx->PixelMaps.ItoR.Size - 1;
111   GLuint gmask = ctx->PixelMaps.ItoG.Size - 1;
112   GLuint bmask = ctx->PixelMaps.ItoB.Size - 1;
113   GLuint amask = ctx->PixelMaps.ItoA.Size - 1;
114   const GLfloat *rMap = ctx->PixelMaps.ItoR.Map;
115   const GLfloat *gMap = ctx->PixelMaps.ItoG.Map;
116   const GLfloat *bMap = ctx->PixelMaps.ItoB.Map;
117   const GLfloat *aMap = ctx->PixelMaps.ItoA.Map;
118   GLuint i;
119   for (i=0;i<n;i++) {
120      rgba[i][RCOMP] = rMap[index[i] & rmask];
121      rgba[i][GCOMP] = gMap[index[i] & gmask];
122      rgba[i][BCOMP] = bMap[index[i] & bmask];
123      rgba[i][ACOMP] = aMap[index[i] & amask];
124   }
125}
126
127
128void
129_mesa_scale_and_bias_depth(const struct gl_context *ctx, GLuint n,
130                           GLfloat depthValues[])
131{
132   const GLfloat scale = ctx->Pixel.DepthScale;
133   const GLfloat bias = ctx->Pixel.DepthBias;
134   GLuint i;
135   for (i = 0; i < n; i++) {
136      GLfloat d = depthValues[i] * scale + bias;
137      depthValues[i] = CLAMP(d, 0.0F, 1.0F);
138   }
139}
140
141
142void
143_mesa_scale_and_bias_depth_uint(const struct gl_context *ctx, GLuint n,
144                                GLuint depthValues[])
145{
146   const GLdouble max = (double) 0xffffffff;
147   const GLdouble scale = ctx->Pixel.DepthScale;
148   const GLdouble bias = ctx->Pixel.DepthBias * max;
149   GLuint i;
150   for (i = 0; i < n; i++) {
151      GLdouble d = (GLdouble) depthValues[i] * scale + bias;
152      d = CLAMP(d, 0.0, max);
153      depthValues[i] = (GLuint) d;
154   }
155}
156
157/**
158 * Apply various pixel transfer operations to an array of RGBA pixels
159 * as indicated by the transferOps bitmask
160 */
161void
162_mesa_apply_rgba_transfer_ops(struct gl_context *ctx, GLbitfield transferOps,
163                              GLuint n, GLfloat rgba[][4])
164{
165   /* scale & bias */
166   if (transferOps & IMAGE_SCALE_BIAS_BIT) {
167      _mesa_scale_and_bias_rgba(n, rgba,
168                                ctx->Pixel.RedScale, ctx->Pixel.GreenScale,
169                                ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale,
170                                ctx->Pixel.RedBias, ctx->Pixel.GreenBias,
171                                ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias);
172   }
173   /* color map lookup */
174   if (transferOps & IMAGE_MAP_COLOR_BIT) {
175      _mesa_map_rgba( ctx, n, rgba );
176   }
177
178   /* clamping to [0,1] */
179   if (transferOps & IMAGE_CLAMP_BIT) {
180      GLuint i;
181      for (i = 0; i < n; i++) {
182         rgba[i][RCOMP] = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
183         rgba[i][GCOMP] = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
184         rgba[i][BCOMP] = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
185         rgba[i][ACOMP] = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
186      }
187   }
188}
189
190
191/*
192 * Apply color index shift and offset to an array of pixels.
193 */
194void
195_mesa_shift_and_offset_ci(const struct gl_context *ctx,
196                          GLuint n, GLuint indexes[])
197{
198   GLint shift = ctx->Pixel.IndexShift;
199   GLint offset = ctx->Pixel.IndexOffset;
200   GLuint i;
201   if (shift > 0) {
202      for (i=0;i<n;i++) {
203         indexes[i] = (indexes[i] << shift) + offset;
204      }
205   }
206   else if (shift < 0) {
207      shift = -shift;
208      for (i=0;i<n;i++) {
209         indexes[i] = (indexes[i] >> shift) + offset;
210      }
211   }
212   else {
213      for (i=0;i<n;i++) {
214         indexes[i] = indexes[i] + offset;
215      }
216   }
217}
218
219
220
221/**
222 * Apply color index shift, offset and table lookup to an array
223 * of color indexes;
224 */
225void
226_mesa_apply_ci_transfer_ops(const struct gl_context *ctx,
227                            GLbitfield transferOps,
228                            GLuint n, GLuint indexes[])
229{
230   if (transferOps & IMAGE_SHIFT_OFFSET_BIT) {
231      _mesa_shift_and_offset_ci(ctx, n, indexes);
232   }
233   if (transferOps & IMAGE_MAP_COLOR_BIT) {
234      const GLuint mask = ctx->PixelMaps.ItoI.Size - 1;
235      GLuint i;
236      for (i = 0; i < n; i++) {
237         const GLuint j = indexes[i] & mask;
238         indexes[i] = F_TO_I(ctx->PixelMaps.ItoI.Map[j]);
239      }
240   }
241}
242
243
244/**
245 * Apply stencil index shift, offset and table lookup to an array
246 * of stencil values.
247 */
248void
249_mesa_apply_stencil_transfer_ops(const struct gl_context *ctx, GLuint n,
250                                 GLubyte stencil[])
251{
252   if (ctx->Pixel.IndexShift != 0 || ctx->Pixel.IndexOffset != 0) {
253      const GLint offset = ctx->Pixel.IndexOffset;
254      GLint shift = ctx->Pixel.IndexShift;
255      GLuint i;
256      if (shift > 0) {
257         for (i = 0; i < n; i++) {
258            stencil[i] = (stencil[i] << shift) + offset;
259         }
260      }
261      else if (shift < 0) {
262         shift = -shift;
263         for (i = 0; i < n; i++) {
264            stencil[i] = (stencil[i] >> shift) + offset;
265         }
266      }
267      else {
268         for (i = 0; i < n; i++) {
269            stencil[i] = stencil[i] + offset;
270         }
271      }
272   }
273   if (ctx->Pixel.MapStencilFlag) {
274      GLuint mask = ctx->PixelMaps.StoS.Size - 1;
275      GLuint i;
276      for (i = 0; i < n; i++) {
277         stencil[i] = (GLubyte) ctx->PixelMaps.StoS.Map[ stencil[i] & mask ];
278      }
279   }
280}
281