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 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 "colormac.h"
  35 #include "pixeltransfer.h"
  36 #include "imports.h"
  37 #include "mtypes.h"
  38
  39
  40 /*
  41  * Apply scale and bias factors to an array of RGBA pixels.
  42  */
  43 void
  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)
  49 {
  50    if (rScale != 1.0 || rBias != 0.0) {
  51       GLuint i;
  52       for (i = 0; i < n; i++) {
  53          rgba[i][RCOMP] = rgba[i][RCOMP] * rScale + rBias;
  54       }
  55    }
  56    if (gScale != 1.0 || gBias != 0.0) {
  57       GLuint i;
  58       for (i = 0; i < n; i++) {
  59          rgba[i][GCOMP] = rgba[i][GCOMP] * gScale + gBias;
  60       }
  61    }
  62    if (bScale != 1.0 || bBias != 0.0) {
  63       GLuint i;
  64       for (i = 0; i < n; i++) {
  65          rgba[i][BCOMP] = rgba[i][BCOMP] * bScale + bBias;
  66       }
  67    }
  68    if (aScale != 1.0 || aBias != 0.0) {
  69       GLuint i;
  70       for (i = 0; i < n; i++) {
  71          rgba[i][ACOMP] = rgba[i][ACOMP] * aScale + aBias;
  72       }
  73    }
  74 }
  75
  76
  77 /*
  78  * Apply pixel mapping to an array of floating point RGBA pixels.
  79  */
  80 void
  81 _mesa_map_rgba( const struct gl_context *ctx, GLuint n, GLfloat rgba[][4] )
  82 {
  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;
  91    GLuint i;
  92    for (i=0;i<n;i++) {
  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)];
 101    }
 102 }
 103
 104 /*
 105  * Map color indexes to float rgba values.
 106  */
 107 void
 108 _mesa_map_ci_to_rgba( const struct gl_context *ctx, GLuint n,
 109                       const GLuint index[], GLfloat rgba[][4] )
 110 {
 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;
 119    GLuint i;
 120    for (i=0;i<n;i++) {
 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];
 125    }
 126 }
 127
 128
 129 void
 130 _mesa_scale_and_bias_depth(const struct gl_context *ctx, GLuint n,
 131                            GLfloat depthValues[])
 132 {
 133    const GLfloat scale = ctx->Pixel.DepthScale;
 134    const GLfloat bias = ctx->Pixel.DepthBias;
 135    GLuint i;
 136    for (i = 0; i < n; i++) {
 137       GLfloat d = depthValues[i] * scale + bias;
 138       depthValues[i] = CLAMP(d, 0.0F, 1.0F);
 139    }
 140 }
 141
 142
 143 void
 144 _mesa_scale_and_bias_depth_uint(const struct gl_context *ctx, GLuint n,
 145                                 GLuint depthValues[])
 146 {
 147    const GLdouble max = (double) 0xffffffff;
 148    const GLdouble scale = ctx->Pixel.DepthScale;
 149    const GLdouble bias = ctx->Pixel.DepthBias * max;
 150    GLuint i;
 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;
 155    }
 156 }
 157
 158 /**
 159  * Apply various pixel transfer operations to an array of RGBA pixels
 160  * as indicated by the transferOps bitmask
 161  */
 162 void
 163 _mesa_apply_rgba_transfer_ops(struct gl_context *ctx, GLbitfield transferOps,
 164                               GLuint n, GLfloat rgba[][4])
 165 {
 166    /* scale & bias */
 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);
 173    }
 174    /* color map lookup */
 175    if (transferOps & IMAGE_MAP_COLOR_BIT) {
 176       _mesa_map_rgba( ctx, n, rgba );
 177    }
 178
 179    /* clamping to [0,1] */
 180    if (transferOps & IMAGE_CLAMP_BIT) {
 181       GLuint i;
 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);
 187       }
 188    }
 189 }
 190
 191
 192 /*
 193  * Apply color index shift and offset to an array of pixels.
 194  */
 195 void
 196 _mesa_shift_and_offset_ci(const struct gl_context *ctx,
 197                           GLuint n, GLuint indexes[])
 198 {
 199    GLint shift = ctx->Pixel.IndexShift;
 200    GLint offset = ctx->Pixel.IndexOffset;
 201    GLuint i;
 202    if (shift > 0) {
 203       for (i=0;i<n;i++) {
 204          indexes[i] = (indexes[i] << shift) + offset;
 205       }
 206    }
 207    else if (shift < 0) {
 208       shift = -shift;
 209       for (i=0;i<n;i++) {
 210          indexes[i] = (indexes[i] >> shift) + offset;
 211       }
 212    }
 213    else {
 214       for (i=0;i<n;i++) {
 215          indexes[i] = indexes[i] + offset;
 216       }
 217    }
 218 }
 219
 220
 221
 222 /**
 223  * Apply color index shift, offset and table lookup to an array
 224  * of color indexes;
 225  */
 226 void
 227 _mesa_apply_ci_transfer_ops(const struct gl_context *ctx,
 228                             GLbitfield transferOps,
 229                             GLuint n, GLuint indexes[])
 230 {
 231    if (transferOps & IMAGE_SHIFT_OFFSET_BIT) {
 232       _mesa_shift_and_offset_ci(ctx, n, indexes);
 233    }
 234    if (transferOps & IMAGE_MAP_COLOR_BIT) {
 235       const GLuint mask = ctx->PixelMaps.ItoI.Size - 1;
 236       GLuint i;
 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]);
 240       }
 241    }
 242 }
 243
 244
 245 /**
 246  * Apply stencil index shift, offset and table lookup to an array
 247  * of stencil values.
 248  */
 249 void
 250 _mesa_apply_stencil_transfer_ops(const struct gl_context *ctx, GLuint n,
 251                                  GLubyte stencil[])
 252 {
 253    if (ctx->Pixel.IndexShift != 0 || ctx->Pixel.IndexOffset != 0) {
 254       const GLint offset = ctx->Pixel.IndexOffset;
 255       GLint shift = ctx->Pixel.IndexShift;
 256       GLuint i;
 257       if (shift > 0) {
 258          for (i = 0; i < n; i++) {
 259             stencil[i] = (stencil[i] << shift) + offset;
 260          }
 261       }
 262       else if (shift < 0) {
 263          shift = -shift;
 264          for (i = 0; i < n; i++) {
 265             stencil[i] = (stencil[i] >> shift) + offset;
 266          }
 267       }
 268       else {
 269          for (i = 0; i < n; i++) {
 270             stencil[i] = stencil[i] + offset;
 271          }
 272       }
 273    }
 274    if (ctx->Pixel.MapStencilFlag) {
 275       GLuint mask = ctx->PixelMaps.StoS.Size - 1;
 276       GLuint i;
 277       for (i = 0; i < n; i++) {
 278          stencil[i] = (GLubyte) ctx->PixelMaps.StoS.Map[ stencil[i] & mask ];
 279       }
 280    }
 281 }