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      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 }
    281