src/mesa/main/drawpix.c

   1 /* $Id: drawpix.c,v 1.58 2001/12/14 02:55:08 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  4.1
   6  *
   7  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 #ifdef PC_HEADER
  29 #include "all.h"
  30 #else
  31 #include "glheader.h"
  32 #include "colormac.h"
  33 #include "context.h"
  34 #include "drawpix.h"
  35 #include "feedback.h"
  36 #include "macros.h"
  37 #include "mem.h"
  38 #include "mmath.h"
  39 #include "state.h"
  40 #include "mtypes.h"
  41 #endif
  42
  43
  44
  45 /*
  46  * Execute glDrawPixels
  47  */
  48 void
  49 _mesa_DrawPixels( GLsizei width, GLsizei height,
  50                   GLenum format, GLenum type, const GLvoid *pixels )
  51 {
  52    GET_CURRENT_CONTEXT(ctx);
  53    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  54
  55    if (ctx->RenderMode==GL_RENDER) {
  56       GLint x, y;
  57       if (!pixels || !ctx->Current.RasterPosValid) {
  58          return;
  59       }
  60
  61       if (ctx->NewState) {
  62          _mesa_update_state(ctx);
  63       }
  64
  65       /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
  66       x = IROUND(ctx->Current.RasterPos[0]);
  67       y = IROUND(ctx->Current.RasterPos[1]);
  68
  69       ctx->OcclusionResult = GL_TRUE;
  70       ctx->Driver.DrawPixels(ctx, x, y, width, height, format, type,
  71                              &ctx->Unpack, pixels);
  72    }
  73    else if (ctx->RenderMode==GL_FEEDBACK) {
  74       /* Feedback the current raster pos info */
  75       if (ctx->Current.RasterPosValid) {
  76          FLUSH_CURRENT( ctx, 0 );
  77          FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
  78          _mesa_feedback_vertex( ctx,
  79                                 ctx->Current.RasterPos,
  80                                 ctx->Current.RasterColor,
  81                                 ctx->Current.RasterIndex,
  82                                 ctx->Current.RasterTexCoord );
  83       }
  84    }
  85    else if (ctx->RenderMode==GL_SELECT) {
  86       if (ctx->Current.RasterPosValid) {
  87          _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
  88       }
  89    }
  90 }
  91
  92
  93
  94 void
  95 _mesa_ReadPixels( GLint x, GLint y, GLsizei width, GLsizei height,
  96                   GLenum format, GLenum type, GLvoid *pixels )
  97 {
  98    GET_CURRENT_CONTEXT(ctx);
  99    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 100
 101    if (!pixels) {
 102       _mesa_error( ctx, GL_INVALID_VALUE, "glReadPixels(pixels)" );
 103       return;
 104    }
 105
 106    if (ctx->NewState)
 107       _mesa_update_state(ctx);
 108
 109    ctx->Driver.ReadPixels(ctx, x, y, width, height,
 110                           format, type, &ctx->Pack, pixels);
 111
 112 }
 113
 114
 115
 116 void
 117 _mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
 118                   GLenum type )
 119 {
 120    GET_CURRENT_CONTEXT(ctx);
 121    GLint destx, desty;
 122    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 123
 124    if (width < 0 || height < 0) {
 125       _mesa_error( ctx, GL_INVALID_VALUE, "glCopyPixels" );
 126       return;
 127    }
 128
 129    if (ctx->NewState) {
 130       _mesa_update_state(ctx);
 131    }
 132
 133    if (ctx->RenderMode==GL_RENDER) {
 134       /* Destination of copy: */
 135       if (!ctx->Current.RasterPosValid) {
 136          return;
 137       }
 138
 139       /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
 140       destx = IROUND(ctx->Current.RasterPos[0]);
 141       desty = IROUND(ctx->Current.RasterPos[1]);
 142
 143       ctx->OcclusionResult = GL_TRUE;
 144
 145       ctx->Driver.CopyPixels( ctx, srcx, srcy, width, height, destx, desty,
 146                               type );
 147    }
 148    else if (ctx->RenderMode == GL_FEEDBACK) {
 149       if (ctx->Current.RasterPosValid) {
 150          FLUSH_CURRENT( ctx, 0 );
 151          FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_COPY_PIXEL_TOKEN );
 152          _mesa_feedback_vertex( ctx,
 153                                 ctx->Current.RasterPos,
 154                                 ctx->Current.RasterColor,
 155                                 ctx->Current.RasterIndex,
 156                                 ctx->Current.RasterTexCoord );
 157       }
 158    }
 159    else if (ctx->RenderMode == GL_SELECT) {
 160       _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
 161    }
 162 }
 163
 164
 165
 166 void
 167 _mesa_Bitmap( GLsizei width, GLsizei height,
 168               GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove,
 169               const GLubyte *bitmap )
 170 {
 171    GET_CURRENT_CONTEXT(ctx);
 172    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 173
 174    /* Error checking */
 175    if (width < 0 || height < 0) {
 176       _mesa_error( ctx, GL_INVALID_VALUE, "glBitmap" );
 177       return;
 178    }
 179
 180    if (ctx->Current.RasterPosValid == GL_FALSE) {
 181       return;    /* do nothing */
 182    }
 183
 184    if (ctx->RenderMode==GL_RENDER) {
 185       if (bitmap) {
 186          /* Truncate, to satisfy conformance tests (matches SGI's OpenGL). */
 187          GLint x = IFLOOR(ctx->Current.RasterPos[0] - xorig);
 188          GLint y = IFLOOR(ctx->Current.RasterPos[1] - yorig);
 189
 190          if (ctx->NewState) {
 191             _mesa_update_state(ctx);
 192          }
 193
 194          ctx->OcclusionResult = GL_TRUE;
 195          ctx->Driver.Bitmap( ctx, x, y, width, height, &ctx->Unpack, bitmap );
 196       }
 197    }
 198    else if (ctx->RenderMode==GL_FEEDBACK) {
 199       if (ctx->Current.RasterPosValid) {
 200          FLUSH_CURRENT(ctx, 0);
 201          FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_BITMAP_TOKEN );
 202          _mesa_feedback_vertex( ctx,
 203                                 ctx->Current.RasterPos,
 204                                 ctx->Current.RasterColor,
 205                                 ctx->Current.RasterIndex,
 206                                 ctx->Current.RasterTexCoord );
 207       }
 208    }
 209    else if (ctx->RenderMode==GL_SELECT) {
 210       /* Bitmaps don't generate selection hits.  See appendix B of 1.1 spec. */
 211    }
 212
 213    /* update raster position */
 214    ctx->Current.RasterPos[0] += xmove;
 215    ctx->Current.RasterPos[1] += ymove;
 216 }