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