src/mesa/drivers/dri/i830/i830_render.c

   1 /*
   2  * Intel i810 DRI driver for Mesa 3.5
   3  *
   4  * Copyright (C) 1999-2000  Keith Whitwell   All Rights Reserved.
   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,
  17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19  * NONINFRINGEMENT.  IN NO EVENT SHALL KEITH WHITWELL BE LIABLE FOR
  20  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
  21  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  22  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Author:
  25  *    Keith Whitwell <keith@tungstengraphics.com>
  26  * Adapted for use on the I830:
  27  *    Jeff Hartmann <jhartmann@2d3d.com>
  28  */
  29 /* $XFree86: xc/lib/GL/mesa/src/drv/i830/i830_render.c,v 1.2 2002/12/10 01:26:53 dawes Exp $ */
  30
  31 /*
  32  * Render unclipped vertex buffers by emitting vertices directly to
  33  * dma buffers.  Use strip/fan hardware acceleration where possible.
  34  *
  35  */
  36 #include "glheader.h"
  37 #include "context.h"
  38 #include "macros.h"
  39 #include "imports.h"
  40 #include "mtypes.h"
  41 #include "enums.h"
  42
  43 #include "tnl/t_context.h"
  44
  45 #include "i830_screen.h"
  46 #include "i830_dri.h"
  47
  48 #include "i830_context.h"
  49 #include "i830_tris.h"
  50 #include "i830_state.h"
  51 #include "i830_ioctl.h"
  52
  53 /*
  54  * Render unclipped vertex buffers by emitting vertices directly to
  55  * dma buffers.  Use strip/fan hardware primitives where possible.
  56  * Try to simulate missing primitives with indexed vertices.
  57  */
  58 #define HAVE_POINTS      0  /* Has it, but can't use because subpixel has to
  59                              * be adjusted for points on the I830/I845G
  60                              */
  61 #define HAVE_LINES       1
  62 #define HAVE_LINE_STRIPS 1
  63 #define HAVE_TRIANGLES   1
  64 #define HAVE_TRI_STRIPS  1
  65 #define HAVE_TRI_STRIP_1 0  /* has it, template can't use it yet */
  66 #define HAVE_TRI_FANS    1
  67 #define HAVE_POLYGONS    1
  68 #define HAVE_QUADS       0
  69 #define HAVE_QUAD_STRIPS 0
  70
  71 #define HAVE_ELTS        0
  72
  73 static GLuint hw_prim[GL_POLYGON+1] = {
  74    0,
  75    PRIM3D_LINELIST,
  76    PRIM3D_LINESTRIP,
  77    PRIM3D_LINESTRIP,
  78    PRIM3D_TRILIST,
  79    PRIM3D_TRISTRIP,
  80    PRIM3D_TRIFAN,
  81    0,
  82    0,
  83    PRIM3D_POLY
  84 };
  85
  86 static const GLenum reduced_prim[GL_POLYGON+1] = {
  87    GL_POINTS,
  88    GL_LINES,
  89    GL_LINES,
  90    GL_LINES,
  91    GL_TRIANGLES,
  92    GL_TRIANGLES,
  93    GL_TRIANGLES,
  94    GL_TRIANGLES,
  95    GL_TRIANGLES,
  96    GL_TRIANGLES
  97 };
  98
  99 static const int scale_prim[GL_POLYGON+1] = {
 100    0,                           /* fallback case */
 101    1,
 102    2,
 103    2,
 104    1,
 105    3,
 106    3,
 107    0,                           /* fallback case */
 108    0,                           /* fallback case */
 109    3
 110 };
 111
 112
 113 #define LOCAL_VARS i830ContextPtr imesa = I830_CONTEXT(ctx)
 114 #define INIT( prim ) do {                                               \
 115    I830_STATECHANGE(imesa, 0);                                          \
 116    i830RasterPrimitive( ctx, reduced_prim[prim], hw_prim[prim] );       \
 117 } while (0)
 118
 119 #define FLUSH()  I830_FIREVERTICES( imesa )
 120 #define GET_CURRENT_VB_MAX_VERTS() \
 121   (((int)imesa->vertex_high - (int)imesa->vertex_low) / (imesa->vertex_size*4))
 122 #define GET_SUBSEQUENT_VB_MAX_VERTS() \
 123   (I830_DMA_BUF_SZ-8) / (imesa->vertex_size * 4)
 124
 125
 126 #define ALLOC_VERTS( nr ) \
 127   i830AllocDmaLow( imesa, (nr) * imesa->vertex_size * 4)
 128 #define EMIT_VERTS( ctx, j, nr, buf ) \
 129   _tnl_emit_vertices_to_buffer(ctx, j, (j)+(nr), buf)
 130
 131 #define TAG(x) i830_##x
 132 #include "tnl_dd/t_dd_dmatmp.h"
 133
 134
 135 /**********************************************************************/
 136 /*                          Render pipeline stage                     */
 137 /**********************************************************************/
 138
 139 /* Heuristic for i830, which can only emit a single primitive per dma
 140  * buffer, and has only a small number of dma buffers.
 141  */
 142 static GLboolean choose_render( struct vertex_buffer *VB, int bufsz )
 143 {
 144    int nr_prims = 0;
 145    int nr_rprims = 0;
 146    int nr_rverts = 0;
 147    int rprim = 0;
 148    int i;
 149
 150
 151    for (i = 0 ; i < VB->PrimitiveCount ; i++)
 152    {
 153       GLuint prim = VB->Primitive[i].mode;
 154       GLuint length = VB->Primitive[i].count;
 155
 156       if (!length)
 157          continue;
 158
 159       if (!hw_prim[prim & PRIM_MODE_MASK])
 160          return GL_FALSE;
 161
 162       nr_prims++;
 163       nr_rverts += length * scale_prim[prim & PRIM_MODE_MASK];
 164
 165       if (reduced_prim[prim&PRIM_MODE_MASK] != rprim) {
 166          nr_rprims++;
 167          rprim = reduced_prim[prim&PRIM_MODE_MASK];
 168       }
 169    }
 170
 171    nr_prims += i / bufsz;
 172    nr_rprims += nr_rverts / bufsz;
 173
 174    if ((nr_prims > nr_rprims * 2) ||
 175        (nr_prims > nr_rprims + 3))
 176       return GL_FALSE;
 177
 178    return GL_TRUE;
 179 }
 180
 181
 182 static GLboolean i830_run_render( GLcontext *ctx,
 183                                  struct tnl_pipeline_stage *stage )
 184 {
 185    i830ContextPtr imesa = I830_CONTEXT(ctx);
 186    TNLcontext *tnl = TNL_CONTEXT(ctx);
 187    struct vertex_buffer *VB = &tnl->vb;
 188    GLuint i;
 189    /* Don't handle clipping or indexed vertices.
 190     */
 191    if (imesa->RenderIndex != 0 ||
 192        !i830_validate_render( ctx, VB ) ||
 193        !choose_render( VB, 200 )) { /* 200 is estimate of nr verts/buf */
 194       return GL_TRUE;
 195    }
 196
 197    tnl->Driver.Render.Start( ctx );
 198
 199    for (i = 0 ; i < VB->PrimitiveCount ; i++)
 200    {
 201       GLuint prim = VB->Primitive[i].mode;
 202       GLuint start = VB->Primitive[i].start;
 203       GLuint length = VB->Primitive[i].count;
 204
 205       if (!length)
 206          continue;
 207
 208       i830_render_tab_verts[prim & PRIM_MODE_MASK]( ctx, start, start + length,
 209                                                     prim );
 210    }
 211
 212    tnl->Driver.Render.Finish( ctx );
 213
 214    return GL_FALSE;     /* finished the pipe */
 215 }
 216
 217
 218 static void i830_check_render( GLcontext *ctx,
 219                                struct tnl_pipeline_stage *stage )
 220 {
 221    stage->inputs = TNL_CONTEXT(ctx)->render_inputs;
 222 }
 223
 224 static void dtr( struct tnl_pipeline_stage *stage )
 225 {
 226    (void)stage;
 227 }
 228
 229
 230 const struct tnl_pipeline_stage _i830_render_stage =
 231 {
 232    "i830 render",
 233    (_DD_NEW_SEPARATE_SPECULAR |
 234     _NEW_TEXTURE|
 235     _NEW_FOG|
 236     _NEW_RENDERMODE),   /* re-check (new inputs) */
 237    0,                   /* re-run (always runs) */
 238    GL_TRUE,             /* active */
 239    0, 0,                /* inputs (set in check_render), outputs */
 240    0, 0,                /* changed_inputs, private */
 241    dtr,                 /* destructor */
 242    i830_check_render,   /* check - initially set to alloc data */
 243    i830_run_render      /* run */
 244 };