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 (!ctx->ReadBuffer->_ColorReadBuffer) {
  46       /* no readbuffer - OK */
  47       return;
  48    }
  49
  50    if (width > MAX_WIDTH)
  51       width = MAX_WIDTH;
  52
  53    swrast_render_start(ctx);
  54
  55    /* read the data from framebuffer */
  56    _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
  57                            width, x, y, CHAN_TYPE, data );
  58
  59    swrast_render_finish(ctx);
  60
  61    /* save PBO binding */
  62    bufferSave = ctx->Unpack.BufferObj;
  63    ctx->Unpack.BufferObj = ctx->Shared->NullBufferObj;
  64
  65    _mesa_ColorTable(target, internalformat, width, GL_RGBA, CHAN_TYPE, data);
  66
  67    /* restore PBO binding */
  68    ctx->Unpack.BufferObj = bufferSave;
  69 }
  70
  71
  72 void
  73 _swrast_CopyColorSubTable( GLcontext *ctx,GLenum target, GLsizei start,
  74                            GLint x, GLint y, GLsizei width)
  75 {
  76    GLchan data[MAX_WIDTH][4];
  77    struct gl_buffer_object *bufferSave;
  78
  79    if (!ctx->ReadBuffer->_ColorReadBuffer) {
  80       /* no readbuffer - OK */
  81       return;
  82    }
  83
  84    if (width > MAX_WIDTH)
  85       width = MAX_WIDTH;
  86
  87    swrast_render_start(ctx);
  88
  89    /* read the data from framebuffer */
  90    _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
  91                            width, x, y, CHAN_TYPE, data );
  92
  93    swrast_render_finish(ctx);
  94
  95    /* save PBO binding */
  96    bufferSave = ctx->Unpack.BufferObj;
  97    ctx->Unpack.BufferObj = ctx->Shared->NullBufferObj;
  98
  99    _mesa_ColorSubTable(target, start, width, GL_RGBA, CHAN_TYPE, data);
 100
 101    /* restore PBO binding */
 102    ctx->Unpack.BufferObj = bufferSave;
 103 }
 104
 105
 106 void
 107 _swrast_CopyConvolutionFilter1D(GLcontext *ctx, GLenum target,
 108                                 GLenum internalFormat,
 109                                 GLint x, GLint y, GLsizei width)
 110 {
 111    GLchan rgba[MAX_CONVOLUTION_WIDTH][4];
 112    struct gl_buffer_object *bufferSave;
 113
 114    if (!ctx->ReadBuffer->_ColorReadBuffer) {
 115       /* no readbuffer - OK */
 116       return;
 117    }
 118
 119    swrast_render_start(ctx);
 120
 121    /* read the data from framebuffer */
 122    _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
 123                            width, x, y, CHAN_TYPE, rgba );
 124
 125    swrast_render_finish(ctx);
 126
 127    /* save PBO binding */
 128    bufferSave = ctx->Unpack.BufferObj;
 129    ctx->Unpack.BufferObj = ctx->Shared->NullBufferObj;
 130
 131    /* store as convolution filter */
 132    _mesa_ConvolutionFilter1D(target, internalFormat, width,
 133                              GL_RGBA, CHAN_TYPE, rgba);
 134
 135    /* restore PBO binding */
 136    ctx->Unpack.BufferObj = bufferSave;
 137 }
 138
 139
 140 void
 141 _swrast_CopyConvolutionFilter2D(GLcontext *ctx, GLenum target,
 142                                 GLenum internalFormat,
 143                                 GLint x, GLint y, GLsizei width, GLsizei height)
 144 {
 145    struct gl_pixelstore_attrib packSave;
 146    GLchan rgba[MAX_CONVOLUTION_HEIGHT][MAX_CONVOLUTION_WIDTH][4];
 147    GLint i;
 148    struct gl_buffer_object *bufferSave;
 149
 150    if (!ctx->ReadBuffer->_ColorReadBuffer) {
 151       /* no readbuffer - OK */
 152       return;
 153    }
 154
 155    swrast_render_start(ctx);
 156
 157    /* read pixels from framebuffer */
 158    for (i = 0; i < height; i++) {
 159       _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
 160                               width, x, y + i, CHAN_TYPE, rgba[i] );
 161    }
 162
 163    swrast_render_finish(ctx);
 164
 165    /*
 166     * HACK: save & restore context state so we can store this as a
 167     * convolution filter via the GL api.  Doesn't call any callbacks
 168     * hanging off ctx->Unpack statechanges.
 169     */
 170
 171    packSave = ctx->Unpack;  /* save pixel packing params */
 172
 173    ctx->Unpack.Alignment = 1;
 174    ctx->Unpack.RowLength = MAX_CONVOLUTION_WIDTH;
 175    ctx->Unpack.SkipPixels = 0;
 176    ctx->Unpack.SkipRows = 0;
 177    ctx->Unpack.ImageHeight = 0;
 178    ctx->Unpack.SkipImages = 0;
 179    ctx->Unpack.SwapBytes = GL_FALSE;
 180    ctx->Unpack.LsbFirst = GL_FALSE;
 181    ctx->Unpack.BufferObj = ctx->Shared->NullBufferObj;
 182    ctx->NewState |= _NEW_PACKUNPACK;
 183
 184    /* save PBO binding */
 185    bufferSave = ctx->Unpack.BufferObj;
 186    ctx->Unpack.BufferObj = ctx->Shared->NullBufferObj;
 187
 188    _mesa_ConvolutionFilter2D(target, internalFormat, width, height,
 189                              GL_RGBA, CHAN_TYPE, rgba);
 190
 191    /* restore PBO binding */
 192    ctx->Unpack.BufferObj = bufferSave;
 193
 194    ctx->Unpack = packSave;  /* restore pixel packing params */
 195    ctx->NewState |= _NEW_PACKUNPACK;
 196 }