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