src/mesa/main/drawpix.c

   1 /* $Id: drawpix.c,v 1.46 2000/11/22 07:32:16 joukj Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2000  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 #include "swrast/swrast.h"
  42 #endif
  43
  44
  45
  46
  47
  48 /*
  49  * Execute glDrawPixels
  50  */
  51 void
  52 _mesa_DrawPixels( GLsizei width, GLsizei height,
  53                   GLenum format, GLenum type, const GLvoid *pixels )
  54 {
  55    GET_CURRENT_CONTEXT(ctx);
  56    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx, "_mesa_DrawPixels" );
  57
  58    if (ctx->RenderMode==GL_RENDER) {
  59       GLint x, y;
  60       if (!pixels || !ctx->Current.RasterPosValid) {
  61          return;
  62       }
  63
  64       if (ctx->NewState) {
  65          gl_update_state(ctx);
  66       }
  67
  68       x = (GLint) (ctx->Current.RasterPos[0] + 0.5F);
  69       y = (GLint) (ctx->Current.RasterPos[1] + 0.5F);
  70
  71       ctx->OcclusionResult = GL_TRUE;
  72
  73       /* see if device driver can do the drawpix */
  74       RENDER_START(ctx);
  75
  76       if (ctx->Driver.DrawPixels
  77           && (*ctx->Driver.DrawPixels)(ctx, x, y, width, height, format, type,
  78                                        &ctx->Unpack, pixels)) {
  79          /* finished */
  80       } else
  81          _swrast_DrawPixels( ctx, x, y, width, height, format, type,
  82                              &ctx->Unpack, pixels );
  83
  84       RENDER_FINISH(ctx);
  85    }
  86    else if (ctx->RenderMode==GL_FEEDBACK) {
  87       if (ctx->Current.RasterPosValid) {
  88          GLfloat color[4];
  89          GLfloat texcoord[4], invq;
  90
  91          FLUSH_TNL( ctx, FLUSH_UPDATE_CURRENT );
  92
  93          color[0] = CHAN_TO_FLOAT(ctx->Current.Color[0]);
  94          color[1] = CHAN_TO_FLOAT(ctx->Current.Color[1]);
  95          color[2] = CHAN_TO_FLOAT(ctx->Current.Color[2]);
  96          color[3] = CHAN_TO_FLOAT(ctx->Current.Color[3]);
  97          invq = 1.0F / ctx->Current.Texcoord[0][3];
  98          texcoord[0] = ctx->Current.Texcoord[0][0] * invq;
  99          texcoord[1] = ctx->Current.Texcoord[0][1] * invq;
 100          texcoord[2] = ctx->Current.Texcoord[0][2] * invq;
 101          texcoord[3] = ctx->Current.Texcoord[0][3];
 102          FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
 103          gl_feedback_vertex( ctx,
 104                              ctx->Current.RasterPos,
 105                              color, ctx->Current.Index, texcoord );
 106       }
 107    }
 108    else if (ctx->RenderMode==GL_SELECT) {
 109       if (ctx->Current.RasterPosValid) {
 110          gl_update_hitflag( ctx, ctx->Current.RasterPos[2] );
 111       }
 112    }
 113 }
 114