glamor/glamor_points.c

   1 /*
   2  * Copyright © 2009 Intel Corporation
   3  * Copyright © 1998 Keith Packard
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Zhigang Gong <zhigang.gong@linux.intel.com>
  26  *
  27  */
  28
  29 #include "glamor_priv.h"
  30 #include "glamor_transform.h"
  31
  32 static const glamor_facet glamor_facet_point = {
  33     .name = "poly_point",
  34     .vs_vars = "in vec2 primitive;\n",
  35     .vs_exec = (GLAMOR_DEFAULT_POINT_SIZE
  36                 GLAMOR_POS(gl_Position, primitive)),
  37 };
  38
  39 static Bool
  40 glamor_poly_point_gl(DrawablePtr drawable, GCPtr gc, int mode, int npt, DDXPointPtr ppt)
  41 {
  42     ScreenPtr screen = drawable->pScreen;
  43     glamor_screen_private *glamor_priv = glamor_get_screen_private(screen);
  44     PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
  45     glamor_program *prog = &glamor_priv->point_prog;
  46     glamor_pixmap_private *pixmap_priv;
  47     int off_x, off_y;
  48     GLshort *vbo_ppt;
  49     char *vbo_offset;
  50     int box_index;
  51     Bool ret = FALSE;
  52
  53     pixmap_priv = glamor_get_pixmap_private(pixmap);
  54     if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv))
  55         goto bail;
  56
  57     glamor_make_current(glamor_priv);
  58
  59     if (prog->failed)
  60         goto bail;
  61
  62     if (!prog->prog) {
  63         if (!glamor_build_program(screen, prog,
  64                                   &glamor_facet_point,
  65                                   &glamor_fill_solid,
  66                                   NULL, NULL))
  67             goto bail;
  68     }
  69
  70     if (!glamor_use_program(drawable, gc, prog, NULL))
  71         goto bail;
  72
  73     vbo_ppt = glamor_get_vbo_space(screen, npt * (2 * sizeof (INT16)), &vbo_offset);
  74     glEnableVertexAttribArray(GLAMOR_VERTEX_POS);
  75     glVertexAttribPointer(GLAMOR_VERTEX_POS, 2, GL_SHORT, GL_FALSE, 0, vbo_offset);
  76     if (mode == CoordModePrevious) {
  77         int n = npt;
  78         INT16 x = 0, y = 0;
  79         while (n--) {
  80             vbo_ppt[0] = (x += ppt->x);
  81             vbo_ppt[1] = (y += ppt->y);
  82             vbo_ppt += 2;
  83             ppt++;
  84         }
  85     } else
  86         memcpy(vbo_ppt, ppt, npt * (2 * sizeof (INT16)));
  87     glamor_put_vbo_space(screen);
  88
  89     glEnable(GL_SCISSOR_TEST);
  90
  91     glamor_pixmap_loop(pixmap_priv, box_index) {
  92         int nbox = RegionNumRects(gc->pCompositeClip);
  93         BoxPtr box = RegionRects(gc->pCompositeClip);
  94
  95         if (!glamor_set_destination_drawable(drawable, box_index, TRUE, TRUE,
  96                                              prog->matrix_uniform, &off_x, &off_y))
  97             goto bail;
  98
  99         while (nbox--) {
 100             glScissor(box->x1 + off_x,
 101                       box->y1 + off_y,
 102                       box->x2 - box->x1,
 103                       box->y2 - box->y1);
 104             box++;
 105             glDrawArrays(GL_POINTS, 0, npt);
 106         }
 107     }
 108
 109     ret = TRUE;
 110
 111 bail:
 112     glDisable(GL_SCISSOR_TEST);
 113     glDisableVertexAttribArray(GLAMOR_VERTEX_POS);
 114
 115     return ret;
 116 }
 117
 118 void
 119 glamor_poly_point(DrawablePtr drawable, GCPtr gc, int mode, int npt,
 120                   DDXPointPtr ppt)
 121 {
 122     if (glamor_poly_point_gl(drawable, gc, mode, npt, ppt))
 123         return;
 124     miPolyPoint(drawable, gc, mode, npt, ppt);
 125 }