src/mesa/swrast/s_imaging.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.3
   4  *
   5  * Copyright (C) 1999-2004  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 "s_context.h"
  31 #include "s_span.h"
  32 #include "colortab.h"
  33 #include "convolve.h"
  34
  35
  36 void
  37 _swrast_CopyColorTable( GLcontext *ctx,
  38                         GLenum target, GLenum internalformat,
  39                         GLint x, GLint y, GLsizei width)
  40 {
  41    GLchan data[MAX_WIDTH][4];
  42    struct gl_buffer_object *bufferSave;
  43
  44    if (!ctx->ReadBuffer->_ColorReadBuffer) {
  45       /* no readbuffer - OK */
  46       return;
  47    }
  48
  49    /* Select buffer to read from */
  50    _swrast_use_read_buffer(ctx);
  51
  52    if (width > MAX_WIDTH)
  53       width = MAX_WIDTH;
  54
  55    /* read the data from framebuffer */
  56    _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
  57                            width, x, y, data );
  58
  59    /* Restore reading from draw buffer (the default) */
  60    _swrast_use_draw_buffer(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    GLchan data[MAX_WIDTH][4];
  78    struct gl_buffer_object *bufferSave;
  79
  80    if (!ctx->ReadBuffer->_ColorReadBuffer) {
  81       /* no readbuffer - OK */
  82       return;
  83    }
  84
  85    /* Select buffer to read from */
  86    _swrast_use_read_buffer(ctx);
  87
  88    if (width > MAX_WIDTH)
  89       width = MAX_WIDTH;
  90
  91    /* read the data from framebuffer */
  92    _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
  93                            width, x, y, data );
  94
  95    /* Restore reading from draw buffer (the default) */
  96    _swrast_use_draw_buffer(ctx);
  97
  98    /* save PBO binding */
  99    bufferSave = ctx->Unpack.BufferObj;
 100    ctx->Unpack.BufferObj = ctx->Array.NullBufferObj;
 101
 102    _mesa_ColorSubTable(target, start, width, GL_RGBA, CHAN_TYPE, data);
 103
 104    /* restore PBO binding */
 105    ctx->Unpack.BufferObj = bufferSave;
 106 }
 107
 108
 109 void
 110 _swrast_CopyConvolutionFilter1D(GLcontext *ctx, GLenum target,
 111                                 GLenum internalFormat,
 112                                 GLint x, GLint y, GLsizei width)
 113 {
 114    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 115    GLchan rgba[MAX_CONVOLUTION_WIDTH][4];
 116    struct gl_buffer_object *bufferSave;
 117
 118    if (!ctx->ReadBuffer->_ColorReadBuffer) {
 119       /* no readbuffer - OK */
 120       return;
 121    }
 122
 123    /* Select buffer to read from */
 124    _swrast_use_read_buffer(ctx);
 125
 126    RENDER_START( swrast, ctx );
 127
 128    /* read the data from framebuffer */
 129    _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
 130                            width, x, y, (GLchan (*)[4]) rgba );
 131
 132    RENDER_FINISH( swrast, ctx );
 133
 134    /* Restore reading from draw buffer (the default) */
 135    _swrast_use_draw_buffer(ctx);
 136
 137    /* save PBO binding */
 138    bufferSave = ctx->Unpack.BufferObj;
 139    ctx->Unpack.BufferObj = ctx->Array.NullBufferObj;
 140
 141    /* store as convolution filter */
 142    _mesa_ConvolutionFilter1D(target, internalFormat, width,
 143                              GL_RGBA, CHAN_TYPE, rgba);
 144
 145    /* restore PBO binding */
 146    ctx->Unpack.BufferObj = bufferSave;
 147 }
 148
 149
 150 void
 151 _swrast_CopyConvolutionFilter2D(GLcontext *ctx, GLenum target,
 152                                 GLenum internalFormat,
 153                                 GLint x, GLint y, GLsizei width, GLsizei height)
 154 {
 155    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 156    struct gl_pixelstore_attrib packSave;
 157    GLchan rgba[MAX_CONVOLUTION_HEIGHT][MAX_CONVOLUTION_WIDTH][4];
 158    GLint i;
 159    struct gl_buffer_object *bufferSave;
 160
 161    if (!ctx->ReadBuffer->_ColorReadBuffer) {
 162       /* no readbuffer - OK */
 163       return;
 164    }
 165
 166    /* Select buffer to read from */
 167    _swrast_use_read_buffer(ctx);
 168
 169    RENDER_START(swrast,ctx);
 170
 171    /* read pixels from framebuffer */
 172    for (i = 0; i < height; i++) {
 173       _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
 174                               width, x, y + i, (GLchan (*)[4]) rgba[i] );
 175    }
 176
 177    RENDER_FINISH(swrast,ctx);
 178
 179    /* Restore reading from draw buffer (the default) */
 180    _swrast_use_draw_buffer(ctx);
 181
 182    /*
 183     * HACK: save & restore context state so we can store this as a
 184     * convolution filter via the GL api.  Doesn't call any callbacks
 185     * hanging off ctx->Unpack statechanges.
 186     */
 187
 188    packSave = ctx->Unpack;  /* save pixel packing params */
 189
 190    ctx->Unpack.Alignment = 1;
 191    ctx->Unpack.RowLength = MAX_CONVOLUTION_WIDTH;
 192    ctx->Unpack.SkipPixels = 0;
 193    ctx->Unpack.SkipRows = 0;
 194    ctx->Unpack.ImageHeight = 0;
 195    ctx->Unpack.SkipImages = 0;
 196    ctx->Unpack.SwapBytes = GL_FALSE;
 197    ctx->Unpack.LsbFirst = GL_FALSE;
 198    ctx->Unpack.BufferObj = ctx->Array.NullBufferObj;
 199    ctx->NewState |= _NEW_PACKUNPACK;
 200
 201    /* save PBO binding */
 202    bufferSave = ctx->Unpack.BufferObj;
 203    ctx->Unpack.BufferObj = ctx->Array.NullBufferObj;
 204
 205    _mesa_ConvolutionFilter2D(target, internalFormat, width, height,
 206                              GL_RGBA, CHAN_TYPE, rgba);
 207
 208    /* restore PBO binding */
 209    ctx->Unpack.BufferObj = bufferSave;
 210
 211    ctx->Unpack = packSave;  /* restore pixel packing params */
 212    ctx->NewState |= _NEW_PACKUNPACK;
 213 }