src/mesa/main/drawpix.c

   1 /* $Id: drawpix.c,v 1.48 2001/01/29 20:47:39 keithw 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 #endif
  42
  43
  44
  45
  46
  47 /*
  48  * Execute glDrawPixels
  49  */
  50 void
  51 _mesa_DrawPixels( GLsizei width, GLsizei height,
  52                   GLenum format, GLenum type, const GLvoid *pixels )
  53 {
  54    GET_CURRENT_CONTEXT(ctx);
  55    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  56
  57    if (ctx->RenderMode==GL_RENDER) {
  58       GLint x, y;
  59       if (!pixels || !ctx->Current.RasterPosValid) {
  60          return;
  61       }
  62
  63       if (ctx->NewState) {
  64          gl_update_state(ctx);
  65       }
  66
  67       x = (GLint) (ctx->Current.RasterPos[0] + 0.5F);
  68       y = (GLint) (ctx->Current.RasterPos[1] + 0.5F);
  69
  70       ctx->OcclusionResult = GL_TRUE;
  71
  72       /* see if device driver can do the drawpix */
  73       RENDER_START(ctx);
  74       ctx->Driver.DrawPixels(ctx, x, y, width, height, format, type,
  75                              &ctx->Unpack, pixels);
  76       RENDER_FINISH(ctx);
  77    }
  78    else if (ctx->RenderMode==GL_FEEDBACK) {
  79       if (ctx->Current.RasterPosValid) {
  80          GLfloat color[4];
  81          GLfloat texcoord[4], invq;
  82
  83          FLUSH_CURRENT(ctx, 0);
  84          color[0] = CHAN_TO_FLOAT(ctx->Current.Color[0]);
  85          color[1] = CHAN_TO_FLOAT(ctx->Current.Color[1]);
  86          color[2] = CHAN_TO_FLOAT(ctx->Current.Color[2]);
  87          color[3] = CHAN_TO_FLOAT(ctx->Current.Color[3]);
  88          invq = 1.0F / ctx->Current.Texcoord[0][3];
  89          texcoord[0] = ctx->Current.Texcoord[0][0] * invq;
  90          texcoord[1] = ctx->Current.Texcoord[0][1] * invq;
  91          texcoord[2] = ctx->Current.Texcoord[0][2] * invq;
  92          texcoord[3] = ctx->Current.Texcoord[0][3];
  93          FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
  94          gl_feedback_vertex( ctx,
  95                              ctx->Current.RasterPos,
  96                              color, ctx->Current.Index, texcoord );
  97       }
  98    }
  99    else if (ctx->RenderMode==GL_SELECT) {
 100       if (ctx->Current.RasterPosValid) {
 101          gl_update_hitflag( ctx, ctx->Current.RasterPos[2] );
 102       }
 103    }
 104 }
 105