reactos/dll/opengl/mesa/src/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 /**
  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  */
  42 void
  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  */
  79 void
  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[IROUND(r * rscale)];
  97       rgba[i][GCOMP] = gMap[IROUND(g * gscale)];
  98       rgba[i][BCOMP] = bMap[IROUND(b * bscale)];
  99       rgba[i][ACOMP] = aMap[IROUND(a * ascale)];
 100    }
 101 }
 102
 103 /*
 104  * Map color indexes to float rgba values.
 105  */
 106 void
 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
 128 /**
 129  * Map ubyte color indexes to ubyte/RGBA values.
 130  */
 131 void
 132 _mesa_map_ci8_to_rgba8(const struct gl_context *ctx,
 133                        GLuint n, const GLubyte index[],
 134                        GLubyte rgba[][4])
 135 {
 136    GLuint rmask = ctx->PixelMaps.ItoR.Size - 1;
 137    GLuint gmask = ctx->PixelMaps.ItoG.Size - 1;
 138    GLuint bmask = ctx->PixelMaps.ItoB.Size - 1;
 139    GLuint amask = ctx->PixelMaps.ItoA.Size - 1;
 140    const GLubyte *rMap = ctx->PixelMaps.ItoR.Map8;
 141    const GLubyte *gMap = ctx->PixelMaps.ItoG.Map8;
 142    const GLubyte *bMap = ctx->PixelMaps.ItoB.Map8;
 143    const GLubyte *aMap = ctx->PixelMaps.ItoA.Map8;
 144    GLuint i;
 145    for (i=0;i<n;i++) {
 146       rgba[i][RCOMP] = rMap[index[i] & rmask];
 147       rgba[i][GCOMP] = gMap[index[i] & gmask];
 148       rgba[i][BCOMP] = bMap[index[i] & bmask];
 149       rgba[i][ACOMP] = aMap[index[i] & amask];
 150    }
 151 }
 152
 153
 154 void
 155 _mesa_scale_and_bias_depth(const struct gl_context *ctx, GLuint n,
 156                            GLfloat depthValues[])
 157 {
 158    const GLfloat scale = ctx->Pixel.DepthScale;
 159    const GLfloat bias = ctx->Pixel.DepthBias;
 160    GLuint i;
 161    for (i = 0; i < n; i++) {
 162       GLfloat d = depthValues[i] * scale + bias;
 163       depthValues[i] = CLAMP(d, 0.0F, 1.0F);
 164    }
 165 }
 166
 167
 168 void
 169 _mesa_scale_and_bias_depth_uint(const struct gl_context *ctx, GLuint n,
 170                                 GLuint depthValues[])
 171 {
 172    const GLdouble max = (double) 0xffffffff;
 173    const GLdouble scale = ctx->Pixel.DepthScale;
 174    const GLdouble bias = ctx->Pixel.DepthBias * max;
 175    GLuint i;
 176    for (i = 0; i < n; i++) {
 177       GLdouble d = (GLdouble) depthValues[i] * scale + bias;
 178       d = CLAMP(d, 0.0, max);
 179       depthValues[i] = (GLuint) d;
 180    }
 181 }
 182
 183 /**
 184  * Apply various pixel transfer operations to an array of RGBA pixels
 185  * as indicated by the transferOps bitmask
 186  */
 187 void
 188 _mesa_apply_rgba_transfer_ops(struct gl_context *ctx, GLbitfield transferOps,
 189                               GLuint n, GLfloat rgba[][4])
 190 {
 191    /* scale & bias */
 192    if (transferOps & IMAGE_SCALE_BIAS_BIT) {
 193       _mesa_scale_and_bias_rgba(n, rgba,
 194                                 ctx->Pixel.RedScale, ctx->Pixel.GreenScale,
 195                                 ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale,
 196                                 ctx->Pixel.RedBias, ctx->Pixel.GreenBias,
 197                                 ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias);
 198    }
 199    /* color map lookup */
 200    if (transferOps & IMAGE_MAP_COLOR_BIT) {
 201       _mesa_map_rgba( ctx, n, rgba );
 202    }
 203
 204    /* clamping to [0,1] */
 205    if (transferOps & IMAGE_CLAMP_BIT) {
 206       GLuint i;
 207       for (i = 0; i < n; i++) {
 208          rgba[i][RCOMP] = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
 209          rgba[i][GCOMP] = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
 210          rgba[i][BCOMP] = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
 211          rgba[i][ACOMP] = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
 212       }
 213    }
 214 }
 215
 216
 217 /*
 218  * Apply color index shift and offset to an array of pixels.
 219  */
 220 void
 221 _mesa_shift_and_offset_ci(const struct gl_context *ctx,
 222                           GLuint n, GLuint indexes[])
 223 {
 224    GLint shift = ctx->Pixel.IndexShift;
 225    GLint offset = ctx->Pixel.IndexOffset;
 226    GLuint i;
 227    if (shift > 0) {
 228       for (i=0;i<n;i++) {
 229          indexes[i] = (indexes[i] << shift) + offset;
 230       }
 231    }
 232    else if (shift < 0) {
 233       shift = -shift;
 234       for (i=0;i<n;i++) {
 235          indexes[i] = (indexes[i] >> shift) + offset;
 236       }
 237    }
 238    else {
 239       for (i=0;i<n;i++) {
 240          indexes[i] = indexes[i] + offset;
 241       }
 242    }
 243 }
 244
 245
 246
 247 /**
 248  * Apply color index shift, offset and table lookup to an array
 249  * of color indexes;
 250  */
 251 void
 252 _mesa_apply_ci_transfer_ops(const struct gl_context *ctx,
 253                             GLbitfield transferOps,
 254                             GLuint n, GLuint indexes[])
 255 {
 256    if (transferOps & IMAGE_SHIFT_OFFSET_BIT) {
 257       _mesa_shift_and_offset_ci(ctx, n, indexes);
 258    }
 259    if (transferOps & IMAGE_MAP_COLOR_BIT) {
 260       const GLuint mask = ctx->PixelMaps.ItoI.Size - 1;
 261       GLuint i;
 262       for (i = 0; i < n; i++) {
 263          const GLuint j = indexes[i] & mask;
 264          indexes[i] = IROUND(ctx->PixelMaps.ItoI.Map[j]);
 265       }
 266    }
 267 }
 268
 269
 270 /**
 271  * Apply stencil index shift, offset and table lookup to an array
 272  * of stencil values.
 273  */
 274 void
 275 _mesa_apply_stencil_transfer_ops(const struct gl_context *ctx, GLuint n,
 276                                  GLubyte stencil[])
 277 {
 278    if (ctx->Pixel.IndexShift != 0 || ctx->Pixel.IndexOffset != 0) {
 279       const GLint offset = ctx->Pixel.IndexOffset;
 280       GLint shift = ctx->Pixel.IndexShift;
 281       GLuint i;
 282       if (shift > 0) {
 283          for (i = 0; i < n; i++) {
 284             stencil[i] = (stencil[i] << shift) + offset;
 285          }
 286       }
 287       else if (shift < 0) {
 288          shift = -shift;
 289          for (i = 0; i < n; i++) {
 290             stencil[i] = (stencil[i] >> shift) + offset;
 291          }
 292       }
 293       else {
 294          for (i = 0; i < n; i++) {
 295             stencil[i] = stencil[i] + offset;
 296          }
 297       }
 298    }
 299    if (ctx->Pixel.MapStencilFlag) {
 300       GLuint mask = ctx->PixelMaps.StoS.Size - 1;
 301       GLuint i;
 302       for (i = 0; i < n; i++) {
 303          stencil[i] = (GLubyte) ctx->PixelMaps.StoS.Map[ stencil[i] & mask ];
 304       }
 305    }
 306 }