src/mesa/pipe/softpipe/sp_quad_output.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /* Vertices are just an array of floats, with all the attributes
  26  * packed.  We currently assume a layout like:
  27  *
  28  * attr[0][0..3] - window position
  29  * attr[1..n][0..3] - remaining attributes.
  30  *
  31  * Attributes are assumed to be 4 floats wide but are packed so that
  32  * all the enabled attributes run contiguously.
  33  */
  34
  35 #include "glheader.h"
  36 #include "imports.h"
  37 #include "sp_context.h"
  38 #include "sp_headers.h"
  39 #include "sp_surface.h"
  40 #include "sp_quad.h"
  41
  42
  43 static void mask_copy( GLfloat (*dest)[4],
  44                        GLfloat (*src)[4],
  45                        GLuint mask )
  46 {
  47    GLuint i, j;
  48
  49    for (i = 0; i < 4; i++) {
  50       if (mask & (1<<i)) {
  51          for (j = 0; j < 4; j++) {
  52             dest[j][i] = src[j][i];
  53          }
  54       }
  55    }
  56 }
  57
  58
  59 /**
  60  * Write quad to framebuffer, taking mask into account.
  61  *
  62  * Note that surfaces support only full quad reads and writes.
  63  */
  64 static void
  65 output_quad(struct quad_stage *qs, struct quad_header *quad)
  66 {
  67    struct softpipe_context *softpipe = qs->softpipe;
  68    GLuint i;
  69
  70    for (i = 0; i < softpipe->framebuffer.num_cbufs; i++) {
  71       struct softpipe_surface *sps
  72          = softpipe_surface(softpipe->framebuffer.cbufs[i]);
  73
  74       if (quad->mask != MASK_ALL) {
  75          GLfloat tmp[4][QUAD_SIZE];
  76
  77          /* Yes, we'll probably have a masked write as well, but this is
  78           * how blend will be done at least.
  79           */
  80
  81          sps->read_quad_f_swz(sps, quad->x0, quad->y0, tmp);
  82
  83          mask_copy( tmp, quad->outputs.color, quad->mask );
  84
  85          sps->write_quad_f_swz(sps, quad->x0, quad->y0, tmp);
  86       }
  87       else {
  88          sps->write_quad_f_swz(sps, quad->x0, quad->y0, quad->outputs.color);
  89       }
  90    }
  91 }
  92
  93
  94 struct quad_stage *sp_quad_output_stage( struct softpipe_context *softpipe )
  95 {
  96    struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
  97
  98    stage->softpipe = softpipe;
  99    stage->run = output_quad;
 100
 101    return stage;
 102 }
 103