src/mesa/swrast/s_imaging.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2005  Brian Paul   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  * BRIAN PAUL 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 /* KW:  Moved these here to remove knowledge of swrast from core mesa.
  26  * Should probably pull the entire software implementation of these
  27  * extensions into either swrast or a sister module.
  28  */
  29
  30 #include "main/glheader.h"
  31 #include "main/colortab.h"
  32 #include "main/convolve.h"
  33 #include "s_context.h"
  34 #include "s_span.h"
  35
  36
  37 void
  38 _swrast_CopyColorTable( GLcontext *ctx,
  39                         GLenum target, GLenum internalformat,
  40                         GLint x, GLint y, GLsizei width)
  41 {
  42    GLchan data[MAX_WIDTH][4];
  43    struct gl_buffer_object *bufferSave;
  44
  45    if (width > MAX_WIDTH)
  46       width = MAX_WIDTH;
  47
  48    swrast_render_start(ctx);
  49
  50    /* read the data from framebuffer */
  51    _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
  52                            width, x, y, CHAN_TYPE, data );
  53
  54    swrast_render_finish(ctx);
  55
  56    /* save PBO binding */
  57    bufferSave = ctx->Unpack.BufferObj;
  58    ctx->Unpack.BufferObj = ctx->Shared->NullBufferObj;
  59
  60    _mesa_ColorTable(target, internalformat, width, GL_RGBA, CHAN_TYPE, data);
  61
  62    /* restore PBO binding */
  63    ctx->Unpack.BufferObj = bufferSave;
  64 }
  65
  66
  67 void
  68 _swrast_CopyColorSubTable( GLcontext *ctx,GLenum target, GLsizei start,
  69                            GLint x, GLint y, GLsizei width)
  70 {
  71    GLchan data[MAX_WIDTH][4];
  72    struct gl_buffer_object *bufferSave;
  73
  74    if (width > MAX_WIDTH)
  75       width = MAX_WIDTH;
  76
  77    swrast_render_start(ctx);
  78
  79    /* read the data from framebuffer */
  80    _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
  81                            width, x, y, CHAN_TYPE, data );
  82
  83    swrast_render_finish(ctx);
  84
  85    /* save PBO binding */
  86    bufferSave = ctx->Unpack.BufferObj;
  87    ctx->Unpack.BufferObj = ctx->Shared->NullBufferObj;
  88
  89    _mesa_ColorSubTable(target, start, width, GL_RGBA, CHAN_TYPE, data);
  90
  91    /* restore PBO binding */
  92    ctx->Unpack.BufferObj = bufferSave;
  93 }
  94
  95
  96 void
  97 _swrast_CopyConvolutionFilter1D(GLcontext *ctx, GLenum target,
  98                                 GLenum internalFormat,
  99                                 GLint x, GLint y, GLsizei width)
 100 {
 101    GLchan rgba[MAX_CONVOLUTION_WIDTH][4];
 102    struct gl_buffer_object *bufferSave;
 103
 104    swrast_render_start(ctx);
 105
 106    /* read the data from framebuffer */
 107    _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
 108                            width, x, y, CHAN_TYPE, rgba );
 109
 110    swrast_render_finish(ctx);
 111
 112    /* save PBO binding */
 113    bufferSave = ctx->Unpack.BufferObj;
 114    ctx->Unpack.BufferObj = ctx->Shared->NullBufferObj;
 115
 116    /* store as convolution filter */
 117    _mesa_ConvolutionFilter1D(target, internalFormat, width,
 118                              GL_RGBA, CHAN_TYPE, rgba);
 119
 120    /* restore PBO binding */
 121    ctx->Unpack.BufferObj = bufferSave;
 122 }
 123
 124
 125 void
 126 _swrast_CopyConvolutionFilter2D(GLcontext *ctx, GLenum target,
 127                                 GLenum internalFormat,
 128                                 GLint x, GLint y, GLsizei width, GLsizei height)
 129 {
 130    struct gl_pixelstore_attrib packSave;
 131    GLchan rgba[MAX_CONVOLUTION_HEIGHT][MAX_CONVOLUTION_WIDTH][4];
 132    GLint i;
 133    struct gl_buffer_object *bufferSave;
 134
 135    swrast_render_start(ctx);
 136
 137    /* read pixels from framebuffer */
 138    for (i = 0; i < height; i++) {
 139       _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
 140                               width, x, y + i, CHAN_TYPE, rgba[i] );
 141    }
 142
 143    swrast_render_finish(ctx);
 144
 145    /*
 146     * HACK: save & restore context state so we can store this as a
 147     * convolution filter via the GL api.  Doesn't call any callbacks
 148     * hanging off ctx->Unpack statechanges.
 149     */
 150
 151    packSave = ctx->Unpack;  /* save pixel packing params */
 152
 153    ctx->Unpack.Alignment = 1;
 154    ctx->Unpack.RowLength = MAX_CONVOLUTION_WIDTH;
 155    ctx->Unpack.SkipPixels = 0;
 156    ctx->Unpack.SkipRows = 0;
 157    ctx->Unpack.ImageHeight = 0;
 158    ctx->Unpack.SkipImages = 0;
 159    ctx->Unpack.SwapBytes = GL_FALSE;
 160    ctx->Unpack.LsbFirst = GL_FALSE;
 161    ctx->Unpack.BufferObj = ctx->Shared->NullBufferObj;
 162    ctx->NewState |= _NEW_PACKUNPACK;
 163
 164    /* save PBO binding */
 165    bufferSave = ctx->Unpack.BufferObj;
 166    ctx->Unpack.BufferObj = ctx->Shared->NullBufferObj;
 167
 168    _mesa_ConvolutionFilter2D(target, internalFormat, width, height,
 169                              GL_RGBA, CHAN_TYPE, rgba);
 170
 171    /* restore PBO binding */
 172    ctx->Unpack.BufferObj = bufferSave;
 173
 174    ctx->Unpack = packSave;  /* restore pixel packing params */
 175    ctx->NewState |= _NEW_PACKUNPACK;
 176 }