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