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    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  43    GLchan data[MAX_WIDTH][4];
  44    struct gl_buffer_object *bufferSave;
  45
  46    if (!ctx->ReadBuffer->_ColorReadBuffer) {
  47       /* no readbuffer - OK */
  48       return;
  49    }
  50
  51    if (width > MAX_WIDTH)
  52       width = MAX_WIDTH;
  53
  54    RENDER_START( swrast, ctx );
  55
  56    /* read the data from framebuffer */
  57    _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
  58                            width, x, y, CHAN_TYPE, data );
  59
  60    RENDER_FINISH(swrast,ctx);
  61
  62    /* save PBO binding */
  63    bufferSave = ctx->Unpack.BufferObj;
  64    ctx->Unpack.BufferObj = ctx->Array.NullBufferObj;
  65
  66    _mesa_ColorTable(target, internalformat, width, GL_RGBA, CHAN_TYPE, data);
  67
  68    /* restore PBO binding */
  69    ctx->Unpack.BufferObj = bufferSave;
  70 }
  71
  72
  73 void
  74 _swrast_CopyColorSubTable( GLcontext *ctx,GLenum target, GLsizei start,
  75                            GLint x, GLint y, GLsizei width)
  76 {
  77    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  78    GLchan data[MAX_WIDTH][4];
  79    struct gl_buffer_object *bufferSave;
  80
  81    if (!ctx->ReadBuffer->_ColorReadBuffer) {
  82       /* no readbuffer - OK */
  83       return;
  84    }
  85
  86    if (width > MAX_WIDTH)
  87       width = MAX_WIDTH;
  88
  89    RENDER_START( swrast, ctx );
  90
  91    /* read the data from framebuffer */
  92    _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
  93                            width, x, y, CHAN_TYPE, data );
  94
  95    RENDER_FINISH(swrast,ctx);
  96
  97    /* save PBO binding */
  98    bufferSave = ctx->Unpack.BufferObj;
  99    ctx->Unpack.BufferObj = ctx->Array.NullBufferObj;
 100
 101    _mesa_ColorSubTable(target, start, width, GL_RGBA, CHAN_TYPE, data);
 102
 103    /* restore PBO binding */
 104    ctx->Unpack.BufferObj = bufferSave;
 105 }
 106
 107
 108 void
 109 _swrast_CopyConvolutionFilter1D(GLcontext *ctx, GLenum target,
 110                                 GLenum internalFormat,
 111                                 GLint x, GLint y, GLsizei width)
 112 {
 113    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 114    GLchan rgba[MAX_CONVOLUTION_WIDTH][4];
 115    struct gl_buffer_object *bufferSave;
 116
 117    if (!ctx->ReadBuffer->_ColorReadBuffer) {
 118       /* no readbuffer - OK */
 119       return;
 120    }
 121
 122    RENDER_START( swrast, ctx );
 123
 124    /* read the data from framebuffer */
 125    _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
 126                            width, x, y, CHAN_TYPE, rgba );
 127
 128    RENDER_FINISH( swrast, ctx );
 129
 130    /* save PBO binding */
 131    bufferSave = ctx->Unpack.BufferObj;
 132    ctx->Unpack.BufferObj = ctx->Array.NullBufferObj;
 133
 134    /* store as convolution filter */
 135    _mesa_ConvolutionFilter1D(target, internalFormat, width,
 136                              GL_RGBA, CHAN_TYPE, rgba);
 137
 138    /* restore PBO binding */
 139    ctx->Unpack.BufferObj = bufferSave;
 140 }
 141
 142
 143 void
 144 _swrast_CopyConvolutionFilter2D(GLcontext *ctx, GLenum target,
 145                                 GLenum internalFormat,
 146                                 GLint x, GLint y, GLsizei width, GLsizei height)
 147 {
 148    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 149    struct gl_pixelstore_attrib packSave;
 150    GLchan rgba[MAX_CONVOLUTION_HEIGHT][MAX_CONVOLUTION_WIDTH][4];
 151    GLint i;
 152    struct gl_buffer_object *bufferSave;
 153
 154    if (!ctx->ReadBuffer->_ColorReadBuffer) {
 155       /* no readbuffer - OK */
 156       return;
 157    }
 158
 159    RENDER_START(swrast,ctx);
 160
 161    /* read pixels from framebuffer */
 162    for (i = 0; i < height; i++) {
 163       _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
 164                               width, x, y + i, CHAN_TYPE, rgba[i] );
 165    }
 166
 167    RENDER_FINISH(swrast,ctx);
 168
 169    /*
 170     * HACK: save & restore context state so we can store this as a
 171     * convolution filter via the GL api.  Doesn't call any callbacks
 172     * hanging off ctx->Unpack statechanges.
 173     */
 174
 175    packSave = ctx->Unpack;  /* save pixel packing params */
 176
 177    ctx->Unpack.Alignment = 1;
 178    ctx->Unpack.RowLength = MAX_CONVOLUTION_WIDTH;
 179    ctx->Unpack.SkipPixels = 0;
 180    ctx->Unpack.SkipRows = 0;
 181    ctx->Unpack.ImageHeight = 0;
 182    ctx->Unpack.SkipImages = 0;
 183    ctx->Unpack.SwapBytes = GL_FALSE;
 184    ctx->Unpack.LsbFirst = GL_FALSE;
 185    ctx->Unpack.BufferObj = ctx->Array.NullBufferObj;
 186    ctx->NewState |= _NEW_PACKUNPACK;
 187
 188    /* save PBO binding */
 189    bufferSave = ctx->Unpack.BufferObj;
 190    ctx->Unpack.BufferObj = ctx->Array.NullBufferObj;
 191
 192    _mesa_ConvolutionFilter2D(target, internalFormat, width, height,
 193                              GL_RGBA, CHAN_TYPE, rgba);
 194
 195    /* restore PBO binding */
 196    ctx->Unpack.BufferObj = bufferSave;
 197
 198    ctx->Unpack = packSave;  /* restore pixel packing params */
 199    ctx->NewState |= _NEW_PACKUNPACK;
 200 }