src/mesa/swrast/s_imaging.c

   1 /* $Id: s_imaging.c,v 1.6 2002/07/09 01:22:52 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  4.1
   6  *
   7  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27 /* KW:  Moved these here to remove knowledge of swrast from core mesa.
  28  * Should probably pull the entire software implementation of these
  29  * extensions into either swrast or a sister module.
  30  */
  31
  32 #include "s_context.h"
  33 #include "s_span.h"
  34
  35 void
  36 _swrast_CopyColorTable( GLcontext *ctx,
  37                         GLenum target, GLenum internalformat,
  38                         GLint x, GLint y, GLsizei width)
  39 {
  40    GLchan data[MAX_WIDTH][4];
  41
  42    /* Select buffer to read from */
  43    _swrast_use_read_buffer(ctx);
  44
  45    if (width > MAX_WIDTH)
  46       width = MAX_WIDTH;
  47
  48    /* read the data from framebuffer */
  49    _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y, data );
  50
  51    /* Restore reading from draw buffer (the default) */
  52    _swrast_use_draw_buffer(ctx);
  53
  54    glColorTable(target, internalformat, width, GL_RGBA, CHAN_TYPE, data);
  55 }
  56
  57 void
  58 _swrast_CopyColorSubTable( GLcontext *ctx,GLenum target, GLsizei start,
  59                            GLint x, GLint y, GLsizei width)
  60 {
  61    GLchan data[MAX_WIDTH][4];
  62
  63    /* Select buffer to read from */
  64    _swrast_use_read_buffer(ctx);
  65
  66    if (width > MAX_WIDTH)
  67       width = MAX_WIDTH;
  68
  69    /* read the data from framebuffer */
  70    _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y, data );
  71
  72    /* Restore reading from draw buffer (the default) */
  73    _swrast_use_draw_buffer(ctx);
  74
  75    glColorSubTable(target, start, width, GL_RGBA, CHAN_TYPE, data);
  76 }
  77
  78
  79 void
  80 _swrast_CopyConvolutionFilter1D(GLcontext *ctx, GLenum target,
  81                                 GLenum internalFormat,
  82                                 GLint x, GLint y, GLsizei width)
  83 {
  84    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  85    GLchan rgba[MAX_CONVOLUTION_WIDTH][4];
  86
  87    /* Select buffer to read from */
  88    _swrast_use_read_buffer(ctx);
  89
  90    RENDER_START( swrast, ctx );
  91
  92    /* read the data from framebuffer */
  93    _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y,
  94                                 (GLchan (*)[4]) rgba );
  95
  96    RENDER_FINISH( swrast, ctx );
  97
  98    /* Restore reading from draw buffer (the default) */
  99    _swrast_use_draw_buffer(ctx);
 100
 101    /* store as convolution filter */
 102    glConvolutionFilter1D(target, internalFormat, width,
 103                          GL_RGBA, CHAN_TYPE, rgba);
 104 }
 105
 106
 107 void
 108 _swrast_CopyConvolutionFilter2D(GLcontext *ctx, GLenum target,
 109                                 GLenum internalFormat,
 110                                 GLint x, GLint y, GLsizei width, GLsizei height)
 111 {
 112    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 113    struct gl_pixelstore_attrib packSave;
 114    GLchan rgba[MAX_CONVOLUTION_HEIGHT][MAX_CONVOLUTION_WIDTH][4];
 115    GLint i;
 116
 117    /* Select buffer to read from */
 118    _swrast_use_read_buffer(ctx);
 119
 120    RENDER_START(swrast,ctx);
 121
 122    /* read pixels from framebuffer */
 123    for (i = 0; i < height; i++) {
 124       _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y + i,
 125                                 (GLchan (*)[4]) rgba[i] );
 126    }
 127
 128    RENDER_FINISH(swrast,ctx);
 129
 130    /* Restore reading from draw buffer (the default) */
 131    _swrast_use_draw_buffer(ctx);
 132
 133    /*
 134     * HACK: save & restore context state so we can store this as a
 135     * convolution filter via the GL api.  Doesn't call any callbacks
 136     * hanging off ctx->Unpack statechanges.
 137     */
 138
 139    packSave = ctx->Unpack;  /* save pixel packing params */
 140
 141    ctx->Unpack.Alignment = 1;
 142    ctx->Unpack.RowLength = MAX_CONVOLUTION_WIDTH;
 143    ctx->Unpack.SkipPixels = 0;
 144    ctx->Unpack.SkipRows = 0;
 145    ctx->Unpack.ImageHeight = 0;
 146    ctx->Unpack.SkipImages = 0;
 147    ctx->Unpack.SwapBytes = GL_FALSE;
 148    ctx->Unpack.LsbFirst = GL_FALSE;
 149    ctx->NewState |= _NEW_PACKUNPACK;
 150
 151    glConvolutionFilter2D(target, internalFormat, width, height,
 152                          GL_RGBA, CHAN_TYPE, rgba);
 153
 154    ctx->Unpack = packSave;  /* restore pixel packing params */
 155    ctx->NewState |= _NEW_PACKUNPACK;
 156 }