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/* $Id: drawpix.c,v 1.1 2003-02-28 11:42:00 pj Exp $ */

/*
 * Mesa 3-D graphics library
 * Version:  4.1
 *
 * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include "glheader.h"
#include "imports.h"
#include "colormac.h"
#include "context.h"
#include "drawpix.h"
#include "feedback.h"
#include "macros.h"
#include "mmath.h"
#include "state.h"
#include "mtypes.h"


/*
 * Execute glDrawPixels
 */
void
_mesa_DrawPixels( GLsizei width, GLsizei height,
                  GLenum format, GLenum type, const GLvoid *pixels )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

   if (width < 0 || height < 0) {
      _mesa_error( ctx, GL_INVALID_VALUE, "glDrawPixels(width or height < 0" );
      return;
   }

   if (ctx->RenderMode==GL_RENDER) {
      GLint x, y;
      if (!pixels || !ctx->Current.RasterPosValid) {
         return;
      }

      if (ctx->NewState) {
         _mesa_update_state(ctx);
      }

      /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
      x = IROUND(ctx->Current.RasterPos[0]);
      y = IROUND(ctx->Current.RasterPos[1]);

      ctx->OcclusionResult = GL_TRUE;
      ctx->Driver.DrawPixels(ctx, x, y, width, height, format, type,
                             &ctx->Unpack, pixels);
   }
   else if (ctx->RenderMode==GL_FEEDBACK) {
      /* Feedback the current raster pos info */
      if (ctx->Current.RasterPosValid) {
         FLUSH_CURRENT( ctx, 0 );
         FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
         _mesa_feedback_vertex( ctx,
                                ctx->Current.RasterPos,
                                ctx->Current.RasterColor,
                                ctx->Current.RasterIndex,
                                ctx->Current.RasterTexCoords[0] );
      }
   }
   else if (ctx->RenderMode==GL_SELECT) {
      if (ctx->Current.RasterPosValid) {
         _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
      }
   }
}



void
_mesa_ReadPixels( GLint x, GLint y, GLsizei width, GLsizei height,
                  GLenum format, GLenum type, GLvoid *pixels )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

   if (width < 0 || height < 0) {
      _mesa_error( ctx, GL_INVALID_VALUE,
                   "glReadPixels(width=%d height=%d)", width, height );
      return;
   }

   if (!pixels) {
      _mesa_error( ctx, GL_INVALID_VALUE, "glReadPixels(pixels)" );
      return;
   }

   if (ctx->NewState)
      _mesa_update_state(ctx);

   ctx->Driver.ReadPixels(ctx, x, y, width, height,
                          format, type, &ctx->Pack, pixels);
}



void
_mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
                  GLenum type )
{
   GET_CURRENT_CONTEXT(ctx);
   GLint destx, desty;
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

   if (width < 0 || height < 0) {
      _mesa_error( ctx, GL_INVALID_VALUE, "glCopyPixels(width or height < 0)" );
      return;
   }

   if (ctx->NewState) {
      _mesa_update_state(ctx);
   }

   if (ctx->RenderMode==GL_RENDER) {
      /* Destination of copy: */
      if (!ctx->Current.RasterPosValid) {
         return;
      }

      /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
      destx = IROUND(ctx->Current.RasterPos[0]);
      desty = IROUND(ctx->Current.RasterPos[1]);

      ctx->OcclusionResult = GL_TRUE;

      ctx->Driver.CopyPixels( ctx, srcx, srcy, width, height, destx, desty,
                              type );
   }
   else if (ctx->RenderMode == GL_FEEDBACK) {
      if (ctx->Current.RasterPosValid) {
         FLUSH_CURRENT( ctx, 0 );
         FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_COPY_PIXEL_TOKEN );
         _mesa_feedback_vertex( ctx,
                                ctx->Current.RasterPos,
                                ctx->Current.RasterColor,
                                ctx->Current.RasterIndex,
                                ctx->Current.RasterTexCoords[0] );
      }
   }
   else if (ctx->RenderMode == GL_SELECT) {
      _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
   }
}



void
_mesa_Bitmap( GLsizei width, GLsizei height,
              GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove,
              const GLubyte *bitmap )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

   if (width < 0 || height < 0) {
      _mesa_error( ctx, GL_INVALID_VALUE, "glBitmap(width or height < 0)" );
      return;
   }

   if (ctx->Current.RasterPosValid == GL_FALSE) {
      return;    /* do nothing */
   }

   if (ctx->RenderMode==GL_RENDER) {
      if (bitmap) {
         /* Truncate, to satisfy conformance tests (matches SGI's OpenGL). */
         GLint x = IFLOOR(ctx->Current.RasterPos[0] - xorig);
         GLint y = IFLOOR(ctx->Current.RasterPos[1] - yorig);

         if (ctx->NewState) {
            _mesa_update_state(ctx);
         }

         ctx->OcclusionResult = GL_TRUE;
         ctx->Driver.Bitmap( ctx, x, y, width, height, &ctx->Unpack, bitmap );
      }
   }
   else if (ctx->RenderMode==GL_FEEDBACK) {
      if (ctx->Current.RasterPosValid) {
         FLUSH_CURRENT(ctx, 0);
         FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_BITMAP_TOKEN );
         _mesa_feedback_vertex( ctx,
                                ctx->Current.RasterPos,
                                ctx->Current.RasterColor,
                                ctx->Current.RasterIndex,
                                ctx->Current.RasterTexCoords[0] );
      }
   }
   else if (ctx->RenderMode==GL_SELECT) {
      /* Bitmaps don't generate selection hits.  See appendix B of 1.1 spec. */
   }

   /* update raster position */
   ctx->Current.RasterPos[0] += xmove;
   ctx->Current.RasterPos[1] += ymove;
}



#if 0  /* experimental */
/*
 * Execute glDrawDepthPixelsMESA().  This function accepts both a color
 * image and depth (Z) image.  Rasterization produces fragments with
 * color and Z taken from these images.  This function is intended for
 * Z-compositing.  Normally, this operation requires two glDrawPixels
 * calls with stencil testing.
 */
void
_mesa_DrawDepthPixelsMESA( GLsizei width, GLsizei height,
                           GLenum colorFormat, GLenum colorType,
                           const GLvoid *colors,
                           GLenum depthType, const GLvoid *depths )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

   if (width < 0 || height < 0) {
      _mesa_error( ctx, GL_INVALID_VALUE,
                   "glDrawDepthPixelsMESA(width or height < 0" );
      return;
   }

   if (ctx->RenderMode==GL_RENDER) {
      GLint x, y;
      if (!colors || !depths || !ctx->Current.RasterPosValid) {
         return;
      }

      if (ctx->NewState) {
         _mesa_update_state(ctx);
      }

      /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
      x = IROUND(ctx->Current.RasterPos[0]);
      y = IROUND(ctx->Current.RasterPos[1]);

      ctx->OcclusionResult = GL_TRUE;
      ctx->Driver.DrawDepthPixelsMESA(ctx, x, y, width, height,
                                      colorFormat, colorType, colors,
                                      depthType, depths, &ctx->Unpack);
   }
   else if (ctx->RenderMode==GL_FEEDBACK) {
      /* Feedback the current raster pos info */
      if (ctx->Current.RasterPosValid) {
         FLUSH_CURRENT( ctx, 0 );
         FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
         _mesa_feedback_vertex( ctx,
                                ctx->Current.RasterPos,
                                ctx->Current.RasterColor,
                                ctx->Current.RasterIndex,
                                ctx->Current.RasterTexCoords[0] );
      }
   }
   else if (ctx->RenderMode==GL_SELECT) {
      if (ctx->Current.RasterPosValid) {
         _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
      }
   }
}

#endif