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 "macros.h"
  35 #include "pixeltransfer.h"
  36 #include "imports.h"
  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
  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
  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
 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
 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
 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
 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
 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
 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
 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 }