path: root/src/mesa/drivers/dri/i915/intel_pixel_copy.c

/**************************************************************************
 * 
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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, sub license, 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 (including the
 * next paragraph) 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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 "enums.h"
#include "image.h"
#include "mtypes.h"
#include "macros.h"
#include "swrast/swrast.h"

#include "intel_screen.h"
#include "intel_context.h"
#include "intel_ioctl.h"
#include "intel_batchbuffer.h"
#include "intel_buffers.h"
#include "intel_blit.h"
#include "intel_regions.h"
#include "intel_tris.h"
#include "intel_pixel.h"
#include "intel_bufmgr.h"


static struct intel_region *copypix_src_region( struct intel_context *intel,
						GLenum type )
{
   switch (type) {
   case GL_COLOR:
      return intel_readbuf_region( intel );
   case GL_DEPTH:
      /* Don't think this is really possible execpt at 16bpp, when we have no stencil.
       */
      if (intel->depth_region &&
	  intel->depth_region->cpp == 2)
	 return intel->depth_region;
   case GL_STENCIL:
      /* Don't think this is really possible. 
       */
      break;
   case GL_DEPTH_STENCIL_EXT:
      /* Does it matter whether it is stencil/depth or depth/stencil?
       */
      return intel->depth_region;
   default:
      break;
   }

   return NULL;
}


/* Doesn't work for overlapping regions.  Could do a double copy or
 * just fallback.
 */
static GLboolean do_texture_copypixels( GLcontext *ctx,
					GLint srcx, GLint srcy, 
					GLsizei width, GLsizei height,
					GLint dstx, GLint dsty, 
					GLenum type )
{
   struct intel_context *intel = intel_context( ctx );
   struct intel_region *dst = intel_drawbuf_region( intel );
   struct intel_region *src = copypix_src_region(intel, type);
   GLenum src_format;
   GLenum src_type;

   if (INTEL_DEBUG & DEBUG_PIXEL)
      fprintf(stderr, "%s\n", __FUNCTION__);

   if (!src || !dst || type != GL_COLOR)
      return GL_FALSE;

   /* Can't handle overlapping regions.  Don't have sufficient control
    * over rasterization to pull it off in-place.  Punt on these for
    * now.
    * 
    * XXX: do a copy to a temporary. 
    */
   {
      drm_clip_rect_t src;
      drm_clip_rect_t dst;
      drm_clip_rect_t tmp;
      
      src.x1 = srcx;
      src.y1 = srcy;
      src.x2 = srcx + width;
      src.y2 = srcy + height;

      dst.x1 = dstx;
      dst.y1 = dsty;
      dst.x1 = dstx + width * ctx->Pixel.ZoomX;
      dst.y2 = dsty + height * ctx->Pixel.ZoomY;


      if (intel_intersect_cliprects(&tmp, &src, &dst)) {
	 _mesa_printf("%s: regions overlap\n", __FUNCTION__);
	 return GL_FALSE;
      }
   }

   intelFlush( &intel->ctx );

   intel->vtbl.install_meta_state(intel);

   /* Is this true?  Also will need to turn depth testing on according
    * to state:
    */
   intel->vtbl.meta_no_stencil_write(intel);
   intel->vtbl.meta_no_depth_write(intel);

   /* Set the 3d engine to draw into the destination region:
    */
   intel->vtbl.meta_draw_region(intel, dst, intel->depth_region);

   intel->vtbl.meta_import_pixel_state(intel);

   if (src->cpp == 2) {
      src_format = GL_RGB;
      src_type = GL_UNSIGNED_SHORT_5_6_5;
   } 
   else {
      src_format = GL_BGRA;
      src_type = GL_UNSIGNED_BYTE;
   }

   /* Set the frontbuffer up as a large rectangular texture.
    */
   if (!intel->vtbl.meta_tex_rect_source( intel, src->buffer, 0,
					  src->pitch,
					  src->height,
					  src_format,
					  src_type )) {
      intel->vtbl.leave_meta_state(intel);
      return GL_FALSE;
   }

      
   intel->vtbl.meta_texture_blend_replace( intel ); 


   LOCK_HARDWARE( intel );
   
   if (intel->driDrawable->numClipRects)
   {
      __DRIdrawablePrivate *dPriv = intel->driDrawable;


      srcy = dPriv->h - srcy - height; 	/* convert from gl to hardware coords */

      srcx += dPriv->x;
      srcy += dPriv->y;

      /* Clip against the source region.  This is the only source
       * clipping we do.  XXX: Just set the texcord wrap mode to clamp
       * or similar.
       *
       */
      if (0) {
	 GLint orig_x = srcx;
	 GLint orig_y = srcy;

	 if (!_mesa_clip_to_region(0, 0, src->pitch, src->height,
                                   &srcx, &srcy, &width, &height)) 
	    goto out;

	 dstx += srcx - orig_x; 
	 dsty += (srcy - orig_y) * ctx->Pixel.ZoomY; 
      }

      /* Just use the regular cliprect mechanism...  Does this need to
       * even hold the lock???
       */
      intel_meta_draw_quad(intel, 

			   dstx, 
			   dstx + width * ctx->Pixel.ZoomX, 
			   dPriv->h - (dsty + height * ctx->Pixel.ZoomY), 
			   dPriv->h - (dsty), 
 
			   0,	/* XXX: what z value? */
			   0x00ff00ff, 
			   srcx, srcx+width, 
			   srcy, srcy+height);

   out:
      intel->vtbl.leave_meta_state(intel);
      intel_batchbuffer_flush(intel->batch);
   }
   UNLOCK_HARDWARE( intel );
   return GL_TRUE;
}





/**
 * CopyPixels with the blitter.  Don't support zooming, pixel transfer, etc.
 */
static GLboolean do_blit_copypixels( GLcontext *ctx,
				     GLint srcx, GLint srcy, 
				     GLsizei width, GLsizei height,
				     GLint dstx, GLint dsty, 
				     GLenum type )
{
   struct intel_context *intel = intel_context( ctx );
   struct intel_region *dst = intel_drawbuf_region( intel );
   struct intel_region *src = copypix_src_region( intel, type );

   /* Copypixels can be more than a straight copy.  Ensure all the
    * extra operations are disabled:
    */
   if (!intel_check_blit_fragment_ops(ctx) ||
       ctx->Pixel.ZoomX != 1.0F || 
       ctx->Pixel.ZoomY != 1.0F)
      return GL_FALSE;

   if (!src || !dst) 
      return GL_FALSE;



   intelFlush( &intel->ctx );
   intel->vtbl.render_start(intel);
   intel->vtbl.emit_state(intel);

   LOCK_HARDWARE( intel );

   if (intel->driDrawable->numClipRects)
   {
      __DRIdrawablePrivate *dPriv = intel->driDrawable;
      drm_clip_rect_t *box = dPriv->pClipRects;
      drm_clip_rect_t dest_rect;
      GLint nbox = dPriv->numClipRects;
      GLint delta_x = 0;      
      GLint delta_y = 0;      
      GLuint i;


      dsty = dPriv->h - dsty - height; 	/* convert from gl to hardware coords */
      srcy = dPriv->h - srcy - height; 	/* convert from gl to hardware coords */
      dstx += dPriv->x;
      dsty += dPriv->y;
      srcx += dPriv->x;
      srcy += dPriv->y;

      /* Clip against the source region.  This is the only source
       * clipping we do.  Dst is clipped with cliprects below.
       *
       * TODO: Scissor?
       */
      {
	 delta_x = srcx - dstx;
	 delta_y = srcy - dsty;

	 if (!_mesa_clip_to_region(0, 0, src->pitch, src->height,
                                   &srcx, &srcy, &width, &height)) 
	    goto out;

	 dstx = srcx - delta_x;
	 dsty = srcy - delta_y;
      }

      dest_rect.x1 = dstx;
      dest_rect.y1 = dsty;
      dest_rect.x2 = dstx + width;
      dest_rect.y2 = dsty + height;

      /* Could do slightly more clipping: Eg, take the intersection of
       * the existing set of cliprects and those cliprects translated
       * by delta_x, delta_y:
       * 
       * This code will not overwrite other windows, but will
       * introduce garbage when copying from obscured window regions.
       */
      for (i = 0 ; i < nbox ; i++ )
      {
	 drm_clip_rect_t rect;

	 if (!intel_intersect_cliprects(&rect, &dest_rect, &box[i]))
	    continue;

	 
	 intelEmitCopyBlit( intel,
			    dst->cpp,
			    src->pitch, src->buffer, 0,
			    dst->pitch, dst->buffer, 0,
			    rect.x1 + delta_x, 
			    rect.y1 + delta_y, /* srcx, srcy */
			    rect.x1, 
			    rect.y1, /* dstx, dsty */
			    rect.x2 - rect.x1, 
			    rect.y2 - rect.y1 );
      }

   out:
      intel_batchbuffer_flush( intel->batch );
   }
   UNLOCK_HARDWARE( intel );
   return GL_TRUE;
}


void intelCopyPixels( GLcontext *ctx,
		      GLint srcx, GLint srcy, 
		      GLsizei width, GLsizei height,
		      GLint destx, GLint desty, 
		      GLenum type )
{
   if (INTEL_DEBUG & DEBUG_PIXEL)
      fprintf(stderr, "%s\n", __FUNCTION__);

   if (do_blit_copypixels( ctx, srcx, srcy, width, height, destx, desty, type))
      return;

   if (do_texture_copypixels( ctx, srcx, srcy, width, height, destx, desty, type))
      return;

   _mesa_printf("fallback to _swrast_CopyPixels\n");
   _swrast_CopyPixels( ctx, srcx, srcy, width, height, destx, desty, type);
}