src/mesa/state_tracker/st_atom_pixeltransfer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /* Authors:
  29  *   Brian Paul
  30  */
  31
  32 #include "st_context.h"
  33 #include "st_sampler_view.h"
  34 #include "st_texture.h"
  35
  36 #include "util/u_inlines.h"
  37 #include "util/u_pack_color.h"
  38
  39
  40 /**
  41  * Update the pixelmap texture with the contents of the R/G/B/A pixel maps.
  42  */
  43 static void
  44 load_color_map_texture(struct gl_context *ctx, struct pipe_resource *pt)
  45 {
  46    struct st_context *st = st_context(ctx);
  47    struct pipe_context *pipe = st->pipe;
  48    struct pipe_transfer *transfer;
  49    const GLuint rSize = ctx->PixelMaps.RtoR.Size;
  50    const GLuint gSize = ctx->PixelMaps.GtoG.Size;
  51    const GLuint bSize = ctx->PixelMaps.BtoB.Size;
  52    const GLuint aSize = ctx->PixelMaps.AtoA.Size;
  53    const uint texSize = pt->width0;
  54    uint *dest;
  55    uint i, j;
  56
  57    dest = (uint *) pipe_transfer_map(pipe,
  58                                      pt, 0, 0, PIPE_TRANSFER_WRITE,
  59                                      0, 0, texSize, texSize, &transfer);
  60
  61    /* Pack four 1D maps into a 2D texture:
  62     * R map is placed horizontally, indexed by S, in channel 0
  63     * G map is placed vertically, indexed by T, in channel 1
  64     * B map is placed horizontally, indexed by S, in channel 2
  65     * A map is placed vertically, indexed by T, in channel 3
  66     */
  67    for (i = 0; i < texSize; i++) {
  68       for (j = 0; j < texSize; j++) {
  69          union util_color uc;
  70          int k = (i * texSize + j);
  71          float rgba[4];
  72          rgba[0] = ctx->PixelMaps.RtoR.Map[j * rSize / texSize];
  73          rgba[1] = ctx->PixelMaps.GtoG.Map[i * gSize / texSize];
  74          rgba[2] = ctx->PixelMaps.BtoB.Map[j * bSize / texSize];
  75          rgba[3] = ctx->PixelMaps.AtoA.Map[i * aSize / texSize];
  76          util_pack_color(rgba, pt->format, &uc);
  77          *(dest + k) = uc.ui[0];
  78       }
  79    }
  80
  81    pipe_transfer_unmap(pipe, transfer);
  82 }
  83
  84 /**
  85  * Upload the pixel transfer color map texture.
  86  */
  87 void
  88 st_update_pixel_transfer(struct st_context *st)
  89 {
  90    struct gl_context *ctx = st->ctx;
  91
  92    if (ctx->Pixel.MapColorFlag) {
  93       /* create the colormap/texture now if not already done */
  94       if (!st->pixel_xfer.pixelmap_texture) {
  95          st->pixel_xfer.pixelmap_texture = st_create_color_map_texture(ctx);
  96          st->pixel_xfer.pixelmap_sampler_view =
  97             st_create_texture_sampler_view(st->pipe,
  98                                            st->pixel_xfer.pixelmap_texture);
  99       }
 100       load_color_map_texture(ctx, st->pixel_xfer.pixelmap_texture);
 101    }
 102 }