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      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 static void
     88 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 }
    103 
    104 
    105 const struct st_tracked_state st_update_pixel_transfer = {
    106    update_pixel_transfer				/* update */
    107 };
    108