dll/opengl/mesa/main/pixeltransfer.c

   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  * \file pixeltransfer.c
  27  * Pixel transfer operations (scale, bias, table lookups, etc)
  28  */
  29
  30 #include <precomp.h>
  31
  32 /*
  33  * Apply scale and bias factors to an array of RGBA pixels.
  34  */
  35 void
  36 _mesa_scale_and_bias_rgba(GLuint n, GLfloat rgba[][4],
  37                           GLfloat rScale, GLfloat gScale,
  38                           GLfloat bScale, GLfloat aScale,
  39                           GLfloat rBias, GLfloat gBias,
  40                           GLfloat bBias, GLfloat aBias)
  41 {
  42    if (rScale != 1.0 || rBias != 0.0) {
  43       GLuint i;
  44       for (i = 0; i < n; i++) {
  45          rgba[i][RCOMP] = rgba[i][RCOMP] * rScale + rBias;
  46       }
  47    }
  48    if (gScale != 1.0 || gBias != 0.0) {
  49       GLuint i;
  50       for (i = 0; i < n; i++) {
  51          rgba[i][GCOMP] = rgba[i][GCOMP] * gScale + gBias;
  52       }
  53    }
  54    if (bScale != 1.0 || bBias != 0.0) {
  55       GLuint i;
  56       for (i = 0; i < n; i++) {
  57          rgba[i][BCOMP] = rgba[i][BCOMP] * bScale + bBias;
  58       }
  59    }
  60    if (aScale != 1.0 || aBias != 0.0) {
  61       GLuint i;
  62       for (i = 0; i < n; i++) {
  63          rgba[i][ACOMP] = rgba[i][ACOMP] * aScale + aBias;
  64       }
  65    }
  66 }
  67
  68
  69 /*
  70  * Apply pixel mapping to an array of floating point RGBA pixels.
  71  */
  72 void
  73 _mesa_map_rgba( const struct gl_context *ctx, GLuint n, GLfloat rgba[][4] )
  74 {
  75    const GLfloat rscale = (GLfloat) (ctx->PixelMaps.RtoR.Size - 1);
  76    const GLfloat gscale = (GLfloat) (ctx->PixelMaps.GtoG.Size - 1);
  77    const GLfloat bscale = (GLfloat) (ctx->PixelMaps.BtoB.Size - 1);
  78    const GLfloat ascale = (GLfloat) (ctx->PixelMaps.AtoA.Size - 1);
  79    const GLfloat *rMap = ctx->PixelMaps.RtoR.Map;
  80    const GLfloat *gMap = ctx->PixelMaps.GtoG.Map;
  81    const GLfloat *bMap = ctx->PixelMaps.BtoB.Map;
  82    const GLfloat *aMap = ctx->PixelMaps.AtoA.Map;
  83    GLuint i;
  84    for (i=0;i<n;i++) {
  85       GLfloat r = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
  86       GLfloat g = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
  87       GLfloat b = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
  88       GLfloat a = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
  89       rgba[i][RCOMP] = rMap[IROUND(r * rscale)];
  90       rgba[i][GCOMP] = gMap[IROUND(g * gscale)];
  91       rgba[i][BCOMP] = bMap[IROUND(b * bscale)];
  92       rgba[i][ACOMP] = aMap[IROUND(a * ascale)];
  93    }
  94 }
  95
  96 /*
  97  * Map color indexes to float rgba values.
  98  */
  99 void
 100 _mesa_map_ci_to_rgba( const struct gl_context *ctx, GLuint n,
 101                       const GLuint index[], GLfloat rgba[][4] )
 102 {
 103    GLuint rmask = ctx->PixelMaps.ItoR.Size - 1;
 104    GLuint gmask = ctx->PixelMaps.ItoG.Size - 1;
 105    GLuint bmask = ctx->PixelMaps.ItoB.Size - 1;
 106    GLuint amask = ctx->PixelMaps.ItoA.Size - 1;
 107    const GLfloat *rMap = ctx->PixelMaps.ItoR.Map;
 108    const GLfloat *gMap = ctx->PixelMaps.ItoG.Map;
 109    const GLfloat *bMap = ctx->PixelMaps.ItoB.Map;
 110    const GLfloat *aMap = ctx->PixelMaps.ItoA.Map;
 111    GLuint i;
 112    for (i=0;i<n;i++) {
 113       rgba[i][RCOMP] = rMap[index[i] & rmask];
 114       rgba[i][GCOMP] = gMap[index[i] & gmask];
 115       rgba[i][BCOMP] = bMap[index[i] & bmask];
 116       rgba[i][ACOMP] = aMap[index[i] & amask];
 117    }
 118 }
 119
 120
 121 /**
 122  * Map ubyte color indexes to ubyte/RGBA values.
 123  */
 124 void
 125 _mesa_map_ci8_to_rgba8(const struct gl_context *ctx,
 126                        GLuint n, const GLubyte index[],
 127                        GLubyte rgba[][4])
 128 {
 129    GLuint rmask = ctx->PixelMaps.ItoR.Size - 1;
 130    GLuint gmask = ctx->PixelMaps.ItoG.Size - 1;
 131    GLuint bmask = ctx->PixelMaps.ItoB.Size - 1;
 132    GLuint amask = ctx->PixelMaps.ItoA.Size - 1;
 133    const GLubyte *rMap = ctx->PixelMaps.ItoR.Map8;
 134    const GLubyte *gMap = ctx->PixelMaps.ItoG.Map8;
 135    const GLubyte *bMap = ctx->PixelMaps.ItoB.Map8;
 136    const GLubyte *aMap = ctx->PixelMaps.ItoA.Map8;
 137    GLuint i;
 138    for (i=0;i<n;i++) {
 139       rgba[i][RCOMP] = rMap[index[i] & rmask];
 140       rgba[i][GCOMP] = gMap[index[i] & gmask];
 141       rgba[i][BCOMP] = bMap[index[i] & bmask];
 142       rgba[i][ACOMP] = aMap[index[i] & amask];
 143    }
 144 }
 145
 146
 147 void
 148 _mesa_scale_and_bias_depth(const struct gl_context *ctx, GLuint n,
 149                            GLfloat depthValues[])
 150 {
 151    const GLfloat scale = ctx->Pixel.DepthScale;
 152    const GLfloat bias = ctx->Pixel.DepthBias;
 153    GLuint i;
 154    for (i = 0; i < n; i++) {
 155       GLfloat d = depthValues[i] * scale + bias;
 156       depthValues[i] = CLAMP(d, 0.0F, 1.0F);
 157    }
 158 }
 159
 160
 161 void
 162 _mesa_scale_and_bias_depth_uint(const struct gl_context *ctx, GLuint n,
 163                                 GLuint depthValues[])
 164 {
 165    const GLdouble max = (double) 0xffffffff;
 166    const GLdouble scale = ctx->Pixel.DepthScale;
 167    const GLdouble bias = ctx->Pixel.DepthBias * max;
 168    GLuint i;
 169    for (i = 0; i < n; i++) {
 170       GLdouble d = (GLdouble) depthValues[i] * scale + bias;
 171       d = CLAMP(d, 0.0, max);
 172       depthValues[i] = (GLuint) d;
 173    }
 174 }
 175
 176 /**
 177  * Apply various pixel transfer operations to an array of RGBA pixels
 178  * as indicated by the transferOps bitmask
 179  */
 180 void
 181 _mesa_apply_rgba_transfer_ops(struct gl_context *ctx, GLbitfield transferOps,
 182                               GLuint n, GLfloat rgba[][4])
 183 {
 184    /* scale & bias */
 185    if (transferOps & IMAGE_SCALE_BIAS_BIT) {
 186       _mesa_scale_and_bias_rgba(n, rgba,
 187                                 ctx->Pixel.RedScale, ctx->Pixel.GreenScale,
 188                                 ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale,
 189                                 ctx->Pixel.RedBias, ctx->Pixel.GreenBias,
 190                                 ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias);
 191    }
 192    /* color map lookup */
 193    if (transferOps & IMAGE_MAP_COLOR_BIT) {
 194       _mesa_map_rgba( ctx, n, rgba );
 195    }
 196
 197    /* clamping to [0,1] */
 198    if (transferOps & IMAGE_CLAMP_BIT) {
 199       GLuint i;
 200       for (i = 0; i < n; i++) {
 201          rgba[i][RCOMP] = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
 202          rgba[i][GCOMP] = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
 203          rgba[i][BCOMP] = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
 204          rgba[i][ACOMP] = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
 205       }
 206    }
 207 }
 208
 209
 210 /*
 211  * Apply color index shift and offset to an array of pixels.
 212  */
 213 void
 214 _mesa_shift_and_offset_ci(const struct gl_context *ctx,
 215                           GLuint n, GLuint indexes[])
 216 {
 217    GLint shift = ctx->Pixel.IndexShift;
 218    GLint offset = ctx->Pixel.IndexOffset;
 219    GLuint i;
 220    if (shift > 0) {
 221       for (i=0;i<n;i++) {
 222          indexes[i] = (indexes[i] << shift) + offset;
 223       }
 224    }
 225    else if (shift < 0) {
 226       shift = -shift;
 227       for (i=0;i<n;i++) {
 228          indexes[i] = (indexes[i] >> shift) + offset;
 229       }
 230    }
 231    else {
 232       for (i=0;i<n;i++) {
 233          indexes[i] = indexes[i] + offset;
 234       }
 235    }
 236 }
 237
 238
 239
 240 /**
 241  * Apply color index shift, offset and table lookup to an array
 242  * of color indexes;
 243  */
 244 void
 245 _mesa_apply_ci_transfer_ops(const struct gl_context *ctx,
 246                             GLbitfield transferOps,
 247                             GLuint n, GLuint indexes[])
 248 {
 249    if (transferOps & IMAGE_SHIFT_OFFSET_BIT) {
 250       _mesa_shift_and_offset_ci(ctx, n, indexes);
 251    }
 252    if (transferOps & IMAGE_MAP_COLOR_BIT) {
 253       const GLuint mask = ctx->PixelMaps.ItoI.Size - 1;
 254       GLuint i;
 255       for (i = 0; i < n; i++) {
 256          const GLuint j = indexes[i] & mask;
 257          indexes[i] = IROUND(ctx->PixelMaps.ItoI.Map[j]);
 258       }
 259    }
 260 }
 261
 262
 263 /**
 264  * Apply stencil index shift, offset and table lookup to an array
 265  * of stencil values.
 266  */
 267 void
 268 _mesa_apply_stencil_transfer_ops(const struct gl_context *ctx, GLuint n,
 269                                  GLubyte stencil[])
 270 {
 271    if (ctx->Pixel.IndexShift != 0 || ctx->Pixel.IndexOffset != 0) {
 272       const GLint offset = ctx->Pixel.IndexOffset;
 273       GLint shift = ctx->Pixel.IndexShift;
 274       GLuint i;
 275       if (shift > 0) {
 276          for (i = 0; i < n; i++) {
 277             stencil[i] = (stencil[i] << shift) + offset;
 278          }
 279       }
 280       else if (shift < 0) {
 281          shift = -shift;
 282          for (i = 0; i < n; i++) {
 283             stencil[i] = (stencil[i] >> shift) + offset;
 284          }
 285       }
 286       else {
 287          for (i = 0; i < n; i++) {
 288             stencil[i] = stencil[i] + offset;
 289          }
 290       }
 291    }
 292    if (ctx->Pixel.MapStencilFlag) {
 293       GLuint mask = ctx->PixelMaps.StoS.Size - 1;
 294       GLuint i;
 295       for (i = 0; i < n; i++) {
 296          stencil[i] = (GLubyte) ctx->PixelMaps.StoS.Map[ stencil[i] & mask ];
 297       }
 298    }
 299 }