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 OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26
27 /**
28 * \file pixeltransfer.c
29 * Pixel transfer operations (scale, bias, table lookups, etc)
30 */
31
32
33 #include "glheader.h"
34 #include "macros.h"
35 #include "pixeltransfer.h"
36
37 #include "mtypes.h"
38 #include "util/rounding.h"
39
40
41 /*
42 * Apply scale and bias factors to an array of RGBA pixels.
43 */
44 void
_mesa_scale_and_bias_rgba(GLuint n,GLfloat rgba[][4],GLfloat rScale,GLfloat gScale,GLfloat bScale,GLfloat aScale,GLfloat rBias,GLfloat gBias,GLfloat bBias,GLfloat aBias)45 _mesa_scale_and_bias_rgba(GLuint n, GLfloat rgba[][4],
46 GLfloat rScale, GLfloat gScale,
47 GLfloat bScale, GLfloat aScale,
48 GLfloat rBias, GLfloat gBias,
49 GLfloat bBias, GLfloat aBias)
50 {
51 if (rScale != 1.0F || rBias != 0.0F) {
52 GLuint i;
53 for (i = 0; i < n; i++) {
54 rgba[i][RCOMP] = rgba[i][RCOMP] * rScale + rBias;
55 }
56 }
57 if (gScale != 1.0F || gBias != 0.0F) {
58 GLuint i;
59 for (i = 0; i < n; i++) {
60 rgba[i][GCOMP] = rgba[i][GCOMP] * gScale + gBias;
61 }
62 }
63 if (bScale != 1.0F || bBias != 0.0F) {
64 GLuint i;
65 for (i = 0; i < n; i++) {
66 rgba[i][BCOMP] = rgba[i][BCOMP] * bScale + bBias;
67 }
68 }
69 if (aScale != 1.0F || aBias != 0.0F) {
70 GLuint i;
71 for (i = 0; i < n; i++) {
72 rgba[i][ACOMP] = rgba[i][ACOMP] * aScale + aBias;
73 }
74 }
75 }
76
77
78 /*
79 * Apply pixel mapping to an array of floating point RGBA pixels.
80 */
81 void
_mesa_map_rgba(const struct gl_context * ctx,GLuint n,GLfloat rgba[][4])82 _mesa_map_rgba( const struct gl_context *ctx, GLuint n, GLfloat rgba[][4] )
83 {
84 const GLfloat rscale = (GLfloat) (ctx->PixelMaps.RtoR.Size - 1);
85 const GLfloat gscale = (GLfloat) (ctx->PixelMaps.GtoG.Size - 1);
86 const GLfloat bscale = (GLfloat) (ctx->PixelMaps.BtoB.Size - 1);
87 const GLfloat ascale = (GLfloat) (ctx->PixelMaps.AtoA.Size - 1);
88 const GLfloat *rMap = ctx->PixelMaps.RtoR.Map;
89 const GLfloat *gMap = ctx->PixelMaps.GtoG.Map;
90 const GLfloat *bMap = ctx->PixelMaps.BtoB.Map;
91 const GLfloat *aMap = ctx->PixelMaps.AtoA.Map;
92 GLuint i;
93 for (i=0;i<n;i++) {
94 GLfloat r = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
95 GLfloat g = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
96 GLfloat b = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
97 GLfloat a = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
98 rgba[i][RCOMP] = rMap[(int)_mesa_lroundevenf(r * rscale)];
99 rgba[i][GCOMP] = gMap[(int)_mesa_lroundevenf(g * gscale)];
100 rgba[i][BCOMP] = bMap[(int)_mesa_lroundevenf(b * bscale)];
101 rgba[i][ACOMP] = aMap[(int)_mesa_lroundevenf(a * ascale)];
102 }
103 }
104
105 /*
106 * Map color indexes to float rgba values.
107 */
108 void
_mesa_map_ci_to_rgba(const struct gl_context * ctx,GLuint n,const GLuint index[],GLfloat rgba[][4])109 _mesa_map_ci_to_rgba( const struct gl_context *ctx, GLuint n,
110 const GLuint index[], GLfloat rgba[][4] )
111 {
112 GLuint rmask = ctx->PixelMaps.ItoR.Size - 1;
113 GLuint gmask = ctx->PixelMaps.ItoG.Size - 1;
114 GLuint bmask = ctx->PixelMaps.ItoB.Size - 1;
115 GLuint amask = ctx->PixelMaps.ItoA.Size - 1;
116 const GLfloat *rMap = ctx->PixelMaps.ItoR.Map;
117 const GLfloat *gMap = ctx->PixelMaps.ItoG.Map;
118 const GLfloat *bMap = ctx->PixelMaps.ItoB.Map;
119 const GLfloat *aMap = ctx->PixelMaps.ItoA.Map;
120 GLuint i;
121 for (i=0;i<n;i++) {
122 rgba[i][RCOMP] = rMap[index[i] & rmask];
123 rgba[i][GCOMP] = gMap[index[i] & gmask];
124 rgba[i][BCOMP] = bMap[index[i] & bmask];
125 rgba[i][ACOMP] = aMap[index[i] & amask];
126 }
127 }
128
129
130 void
_mesa_scale_and_bias_depth(const struct gl_context * ctx,GLuint n,GLfloat depthValues[])131 _mesa_scale_and_bias_depth(const struct gl_context *ctx, GLuint n,
132 GLfloat depthValues[])
133 {
134 const GLfloat scale = ctx->Pixel.DepthScale;
135 const GLfloat bias = ctx->Pixel.DepthBias;
136 GLuint i;
137 for (i = 0; i < n; i++) {
138 GLfloat d = depthValues[i] * scale + bias;
139 depthValues[i] = CLAMP(d, 0.0F, 1.0F);
140 }
141 }
142
143
144 void
_mesa_scale_and_bias_depth_uint(const struct gl_context * ctx,GLuint n,GLuint depthValues[])145 _mesa_scale_and_bias_depth_uint(const struct gl_context *ctx, GLuint n,
146 GLuint depthValues[])
147 {
148 const GLdouble max = (double) 0xffffffff;
149 const GLdouble scale = ctx->Pixel.DepthScale;
150 const GLdouble bias = ctx->Pixel.DepthBias * max;
151 GLuint i;
152 for (i = 0; i < n; i++) {
153 GLdouble d = (GLdouble) depthValues[i] * scale + bias;
154 d = CLAMP(d, 0.0, max);
155 depthValues[i] = (GLuint) d;
156 }
157 }
158
159 /**
160 * Apply various pixel transfer operations to an array of RGBA pixels
161 * as indicated by the transferOps bitmask
162 */
163 void
_mesa_apply_rgba_transfer_ops(struct gl_context * ctx,GLbitfield transferOps,GLuint n,GLfloat rgba[][4])164 _mesa_apply_rgba_transfer_ops(struct gl_context *ctx, GLbitfield transferOps,
165 GLuint n, GLfloat rgba[][4])
166 {
167 /* scale & bias */
168 if (transferOps & IMAGE_SCALE_BIAS_BIT) {
169 _mesa_scale_and_bias_rgba(n, rgba,
170 ctx->Pixel.RedScale, ctx->Pixel.GreenScale,
171 ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale,
172 ctx->Pixel.RedBias, ctx->Pixel.GreenBias,
173 ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias);
174 }
175 /* color map lookup */
176 if (transferOps & IMAGE_MAP_COLOR_BIT) {
177 _mesa_map_rgba( ctx, n, rgba );
178 }
179
180 /* clamping to [0,1] */
181 if (transferOps & IMAGE_CLAMP_BIT) {
182 GLuint i;
183 for (i = 0; i < n; i++) {
184 rgba[i][RCOMP] = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
185 rgba[i][GCOMP] = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
186 rgba[i][BCOMP] = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
187 rgba[i][ACOMP] = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
188 }
189 }
190 }
191
192
193 /*
194 * Apply color index shift and offset to an array of pixels.
195 */
196 void
_mesa_shift_and_offset_ci(const struct gl_context * ctx,GLuint n,GLuint indexes[])197 _mesa_shift_and_offset_ci(const struct gl_context *ctx,
198 GLuint n, GLuint indexes[])
199 {
200 GLint shift = ctx->Pixel.IndexShift;
201 GLint offset = ctx->Pixel.IndexOffset;
202 GLuint i;
203 if (shift > 0) {
204 for (i=0;i<n;i++) {
205 indexes[i] = (indexes[i] << shift) + offset;
206 }
207 }
208 else if (shift < 0) {
209 shift = -shift;
210 for (i=0;i<n;i++) {
211 indexes[i] = (indexes[i] >> shift) + offset;
212 }
213 }
214 else {
215 for (i=0;i<n;i++) {
216 indexes[i] = indexes[i] + offset;
217 }
218 }
219 }
220
221
222
223 /**
224 * Apply color index shift, offset and table lookup to an array
225 * of color indexes;
226 */
227 void
_mesa_apply_ci_transfer_ops(const struct gl_context * ctx,GLbitfield transferOps,GLuint n,GLuint indexes[])228 _mesa_apply_ci_transfer_ops(const struct gl_context *ctx,
229 GLbitfield transferOps,
230 GLuint n, GLuint indexes[])
231 {
232 if (transferOps & IMAGE_SHIFT_OFFSET_BIT) {
233 _mesa_shift_and_offset_ci(ctx, n, indexes);
234 }
235 if (transferOps & IMAGE_MAP_COLOR_BIT) {
236 const GLuint mask = ctx->PixelMaps.ItoI.Size - 1;
237 GLuint i;
238 for (i = 0; i < n; i++) {
239 const GLuint j = indexes[i] & mask;
240 indexes[i] = _mesa_lroundevenf(ctx->PixelMaps.ItoI.Map[j]);
241 }
242 }
243 }
244
245
246 /**
247 * Apply stencil index shift, offset and table lookup to an array
248 * of stencil values.
249 */
250 void
_mesa_apply_stencil_transfer_ops(const struct gl_context * ctx,GLuint n,GLubyte stencil[])251 _mesa_apply_stencil_transfer_ops(const struct gl_context *ctx, GLuint n,
252 GLubyte stencil[])
253 {
254 if (ctx->Pixel.IndexShift != 0 || ctx->Pixel.IndexOffset != 0) {
255 const GLint offset = ctx->Pixel.IndexOffset;
256 GLint shift = ctx->Pixel.IndexShift;
257 GLuint i;
258 if (shift > 0) {
259 for (i = 0; i < n; i++) {
260 stencil[i] = (stencil[i] << shift) + offset;
261 }
262 }
263 else if (shift < 0) {
264 shift = -shift;
265 for (i = 0; i < n; i++) {
266 stencil[i] = (stencil[i] >> shift) + offset;
267 }
268 }
269 else {
270 for (i = 0; i < n; i++) {
271 stencil[i] = stencil[i] + offset;
272 }
273 }
274 }
275 if (ctx->Pixel.MapStencilFlag) {
276 GLuint mask = ctx->PixelMaps.StoS.Size - 1;
277 GLuint i;
278 for (i = 0; i < n; i++) {
279 stencil[i] = (GLubyte) ctx->PixelMaps.StoS.Map[ stencil[i] & mask ];
280 }
281 }
282 }
283