src/mesa/swrast/s_imaging.c

   1
   2 /*
   3  * Mesa 3-D graphics library
   4  * Version:  4.1
   5  *
   6  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 /* KW:  Moved these here to remove knowledge of swrast from core mesa.
  27  * Should probably pull the entire software implementation of these
  28  * extensions into either swrast or a sister module.
  29  */
  30
  31 #include "s_context.h"
  32 #include "s_span.h"
  33
  34 void
  35 _swrast_CopyColorTable( GLcontext *ctx,
  36                         GLenum target, GLenum internalformat,
  37                         GLint x, GLint y, GLsizei width)
  38 {
  39    GLchan data[MAX_WIDTH][4];
  40
  41    /* Select buffer to read from */
  42    _swrast_use_read_buffer(ctx);
  43
  44    if (width > MAX_WIDTH)
  45       width = MAX_WIDTH;
  46
  47    /* read the data from framebuffer */
  48    _swrast_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y, data );
  49
  50    /* Restore reading from draw buffer (the default) */
  51    _swrast_use_draw_buffer(ctx);
  52
  53    glColorTable(target, internalformat, width, GL_RGBA, CHAN_TYPE, data);
  54 }
  55
  56 void
  57 _swrast_CopyColorSubTable( GLcontext *ctx,GLenum target, GLsizei start,
  58                            GLint x, GLint y, GLsizei width)
  59 {
  60    GLchan data[MAX_WIDTH][4];
  61
  62    /* Select buffer to read from */
  63    _swrast_use_read_buffer(ctx);
  64
  65    if (width > MAX_WIDTH)
  66       width = MAX_WIDTH;
  67
  68    /* read the data from framebuffer */
  69    _swrast_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y, data );
  70
  71    /* Restore reading from draw buffer (the default) */
  72    _swrast_use_draw_buffer(ctx);
  73
  74    glColorSubTable(target, start, width, GL_RGBA, CHAN_TYPE, data);
  75 }
  76
  77
  78 void
  79 _swrast_CopyConvolutionFilter1D(GLcontext *ctx, GLenum target,
  80                                 GLenum internalFormat,
  81                                 GLint x, GLint y, GLsizei width)
  82 {
  83    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  84    GLchan rgba[MAX_CONVOLUTION_WIDTH][4];
  85
  86    /* Select buffer to read from */
  87    _swrast_use_read_buffer(ctx);
  88
  89    RENDER_START( swrast, ctx );
  90
  91    /* read the data from framebuffer */
  92    _swrast_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y,
  93                                 (GLchan (*)[4]) rgba );
  94
  95    RENDER_FINISH( swrast, ctx );
  96
  97    /* Restore reading from draw buffer (the default) */
  98    _swrast_use_draw_buffer(ctx);
  99
 100    /* store as convolution filter */
 101    glConvolutionFilter1D(target, internalFormat, width,
 102                          GL_RGBA, CHAN_TYPE, rgba);
 103 }
 104
 105
 106 void
 107 _swrast_CopyConvolutionFilter2D(GLcontext *ctx, GLenum target,
 108                                 GLenum internalFormat,
 109                                 GLint x, GLint y, GLsizei width, GLsizei height)
 110 {
 111    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 112    struct gl_pixelstore_attrib packSave;
 113    GLchan rgba[MAX_CONVOLUTION_HEIGHT][MAX_CONVOLUTION_WIDTH][4];
 114    GLint i;
 115
 116    /* Select buffer to read from */
 117    _swrast_use_read_buffer(ctx);
 118
 119    RENDER_START(swrast,ctx);
 120
 121    /* read pixels from framebuffer */
 122    for (i = 0; i < height; i++) {
 123       _swrast_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y + i,
 124                                 (GLchan (*)[4]) rgba[i] );
 125    }
 126
 127    RENDER_FINISH(swrast,ctx);
 128
 129    /* Restore reading from draw buffer (the default) */
 130    _swrast_use_draw_buffer(ctx);
 131
 132    /*
 133     * HACK: save & restore context state so we can store this as a
 134     * convolution filter via the GL api.  Doesn't call any callbacks
 135     * hanging off ctx->Unpack statechanges.
 136     */
 137
 138    packSave = ctx->Unpack;  /* save pixel packing params */
 139
 140    ctx->Unpack.Alignment = 1;
 141    ctx->Unpack.RowLength = MAX_CONVOLUTION_WIDTH;
 142    ctx->Unpack.SkipPixels = 0;
 143    ctx->Unpack.SkipRows = 0;
 144    ctx->Unpack.ImageHeight = 0;
 145    ctx->Unpack.SkipImages = 0;
 146    ctx->Unpack.SwapBytes = GL_FALSE;
 147    ctx->Unpack.LsbFirst = GL_FALSE;
 148    ctx->NewState |= _NEW_PACKUNPACK;
 149
 150    glConvolutionFilter2D(target, internalFormat, width, height,
 151                          GL_RGBA, CHAN_TYPE, rgba);
 152
 153    ctx->Unpack = packSave;  /* restore pixel packing params */
 154    ctx->NewState |= _NEW_PACKUNPACK;
 155 }