src/mesa/drivers/dri/ffb/ffb_lines.c

   1 /*
   2  *
   3  * GLX Hardware Device Driver for Sun Creator/Creator3D
   4  * Copyright (C) 2000, 2001 David S. Miller
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * DAVID MILLER, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
  22  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  *
  25  *    David S. Miller <davem@redhat.com>
  26  */
  27
  28 #include "main/mtypes.h"
  29 #include "main/mm.h"
  30 #include "main/extensions.h"
  31 #include "ffb_dd.h"
  32 #include "ffb_span.h"
  33 #include "ffb_depth.h"
  34 #include "ffb_context.h"
  35 #include "ffb_vb.h"
  36 #include "ffb_lines.h"
  37 #include "ffb_tris.h"
  38 #include "ffb_lock.h"
  39
  40 #undef FFB_LINE_TRACE
  41
  42 #define FFB_LINE_FLAT_BIT       0x01
  43 #define FFB_LINE_ALPHA_BIT      0x02
  44 #define MAX_FFB_LINE_FUNCS      0x04
  45
  46 static ffb_line_func ffb_line_tab[MAX_FFB_LINE_FUNCS];
  47
  48 /* If the line is not wide, we can support all of the line
  49  * patterning and smooth shading features of OpenGL fully.
  50  */
  51
  52 #define IND (0)
  53 #define TAG(x) x
  54 #include "ffb_linetmp.h"
  55
  56 #define IND (FFB_LINE_FLAT_BIT)
  57 #define TAG(x) x##_flat
  58 #include "ffb_linetmp.h"
  59
  60 #define IND (FFB_LINE_ALPHA_BIT)
  61 #define TAG(x) x##_alpha
  62 #include "ffb_linetmp.h"
  63
  64 #define IND (FFB_LINE_ALPHA_BIT|FFB_LINE_FLAT_BIT)
  65 #define TAG(x) x##_alpha_flat
  66 #include "ffb_linetmp.h"
  67
  68 void ffbDDLinefuncInit(void)
  69 {
  70         init();
  71         init_flat();
  72         init_alpha();
  73         init_alpha_flat();
  74 }
  75
  76 static void ffb_dd_line( GLcontext *ctx, GLuint e0, GLuint e1 )
  77 {
  78         ffbContextPtr fmesa = FFB_CONTEXT(ctx);
  79         ffb_vertex *v0 = &fmesa->verts[e0];
  80         ffb_vertex *v1 = &fmesa->verts[e1];
  81         fmesa->draw_line( ctx, v0, v1 );
  82 }
  83
  84 void ffbChooseLineState(GLcontext *ctx)
  85 {
  86         ffbContextPtr fmesa = FFB_CONTEXT(ctx);
  87         TNLcontext *tnl = TNL_CONTEXT(ctx);
  88         GLuint flags = ctx->_TriangleCaps;
  89         GLuint ind = 0;
  90
  91         tnl->Driver.Render.Line = ffb_dd_line;
  92
  93         if (flags & DD_FLATSHADE)
  94                 ind |= FFB_LINE_FLAT_BIT;
  95
  96         if ((flags & DD_LINE_STIPPLE) != 0 &&
  97             fmesa->lpat == FFB_LPAT_BAD) {
  98                 fmesa->draw_line = ffb_fallback_line;
  99                 return;
 100         }
 101
 102         /* If blending or the alpha test is enabled we need to
 103          * provide alpha components to the chip, else we can
 104          * do without it and thus feed vertex data to the chip
 105          * more efficiently.
 106          */
 107         if (ctx->Color.BlendEnabled || ctx->Color.AlphaEnabled)
 108                 ind |= FFB_LINE_ALPHA_BIT;
 109
 110         fmesa->draw_line = ffb_line_tab[ind];
 111 }