src/mesa/tnl/t_vb_render.c

   1 /* $Id: t_vb_render.c,v 1.35 2003/04/08 02:27:20 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  5.1
   6  *
   7  * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * Authors:
  27  *    Keith Whitwell <keith@tungstengraphics.com>
  28  */
  29
  30
  31 /*
  32  * Render whole vertex buffers, including projection of vertices from
  33  * clip space and clipping of primitives.
  34  *
  35  * This file makes calls to project vertices and to the point, line
  36  * and triangle rasterizers via the function pointers:
  37  *
  38  *    context->Driver.Render.*
  39  *
  40  */
  41
  42
  43 #include "glheader.h"
  44 #include "context.h"
  45 #include "enums.h"
  46 #include "macros.h"
  47 #include "imports.h"
  48 #include "mtypes.h"
  49
  50 #include "math/m_matrix.h"
  51 #include "math/m_xform.h"
  52
  53 #include "t_pipeline.h"
  54
  55
  56
  57 /**********************************************************************/
  58 /*                        Clip single primitives                      */
  59 /**********************************************************************/
  60
  61
  62 #define W(i) coord[i][3]
  63 #define Z(i) coord[i][2]
  64 #define Y(i) coord[i][1]
  65 #define X(i) coord[i][0]
  66 #define SIZE 4
  67 #define TAG(x) x##_4
  68 #include "t_vb_cliptmp.h"
  69
  70
  71
  72 /**********************************************************************/
  73 /*              Clip and render whole begin/end objects               */
  74 /**********************************************************************/
  75
  76 #define NEED_EDGEFLAG_SETUP (ctx->_TriangleCaps & DD_TRI_UNFILLED)
  77 #define EDGEFLAG_GET(idx) VB->EdgeFlag[idx]
  78 #define EDGEFLAG_SET(idx, val) VB->EdgeFlag[idx] = val
  79
  80
  81 /* Vertices, with the possibility of clipping.
  82  */
  83 #define RENDER_POINTS( start, count ) \
  84    tnl->Driver.Render.Points( ctx, start, count )
  85
  86 #define RENDER_LINE( v1, v2 )                   \
  87 do {                                            \
  88    GLubyte c1 = mask[v1], c2 = mask[v2];        \
  89    GLubyte ormask = c1|c2;                      \
  90    if (!ormask)                                 \
  91       LineFunc( ctx, v1, v2 );                  \
  92    else if (!(c1 & c2 & 0x3f))                  \
  93       clip_line_4( ctx, v1, v2, ormask );       \
  94 } while (0)
  95
  96 #define RENDER_TRI( v1, v2, v3 )                        \
  97 do {                                                    \
  98    GLubyte c1 = mask[v1], c2 = mask[v2], c3 = mask[v3]; \
  99    GLubyte ormask = c1|c2|c3;                           \
 100    if (!ormask)                                         \
 101       TriangleFunc( ctx, v1, v2, v3 );                  \
 102    else if (!(c1 & c2 & c3 & 0x3f))                     \
 103       clip_tri_4( ctx, v1, v2, v3, ormask );            \
 104 } while (0)
 105
 106 #define RENDER_QUAD( v1, v2, v3, v4 )                   \
 107 do {                                                    \
 108    GLubyte c1 = mask[v1], c2 = mask[v2];                \
 109    GLubyte c3 = mask[v3], c4 = mask[v4];                \
 110    GLubyte ormask = c1|c2|c3|c4;                        \
 111    if (!ormask)                                         \
 112       QuadFunc( ctx, v1, v2, v3, v4 );                  \
 113    else if (!(c1 & c2 & c3 & c4 & 0x3f))                \
 114       clip_quad_4( ctx, v1, v2, v3, v4, ormask );       \
 115 } while (0)
 116
 117
 118 #define LOCAL_VARS                                              \
 119    TNLcontext *tnl = TNL_CONTEXT(ctx);                          \
 120    struct vertex_buffer *VB = &tnl->vb;                         \
 121    const GLuint * const elt = VB->Elts;                         \
 122    const GLubyte *mask = VB->ClipMask;                          \
 123    const GLuint sz = VB->ClipPtr->size;                         \
 124    const line_func LineFunc = tnl->Driver.Render.Line;          \
 125    const triangle_func TriangleFunc = tnl->Driver.Render.Triangle;      \
 126    const quad_func QuadFunc = tnl->Driver.Render.Quad;          \
 127    const GLboolean stipple = ctx->Line.StippleFlag;             \
 128    (void) (LineFunc && TriangleFunc && QuadFunc);               \
 129    (void) elt; (void) mask; (void) sz; (void) stipple;
 130
 131 #define TAG(x) clip_##x##_verts
 132 #define INIT(x) tnl->Driver.Render.PrimitiveNotify( ctx, x )
 133 #define RESET_STIPPLE if (stipple) tnl->Driver.Render.ResetLineStipple( ctx )
 134 #define RESET_OCCLUSION ctx->OcclusionResult = GL_TRUE
 135 #define PRESERVE_VB_DEFS
 136 #include "t_vb_rendertmp.h"
 137
 138
 139
 140 /* Elts, with the possibility of clipping.
 141  */
 142 #undef ELT
 143 #undef TAG
 144 #define ELT(x) elt[x]
 145 #define TAG(x) clip_##x##_elts
 146 #include "t_vb_rendertmp.h"
 147
 148 /* TODO: do this for all primitives, verts and elts:
 149  */
 150 static void clip_elt_triangles( GLcontext *ctx,
 151                                 GLuint start,
 152                                 GLuint count,
 153                                 GLuint flags )
 154 {
 155    TNLcontext *tnl = TNL_CONTEXT(ctx);
 156    render_func render_tris = tnl->Driver.Render.PrimTabElts[GL_TRIANGLES];
 157    struct vertex_buffer *VB = &tnl->vb;
 158    const GLuint * const elt = VB->Elts;
 159    GLubyte *mask = VB->ClipMask;
 160    GLuint last = count-2;
 161    GLuint j;
 162    (void) flags;
 163
 164    tnl->Driver.Render.PrimitiveNotify( ctx, GL_TRIANGLES );
 165
 166    for (j=start; j < last; j+=3 ) {
 167       GLubyte c1 = mask[elt[j]];
 168       GLubyte c2 = mask[elt[j+1]];
 169       GLubyte c3 = mask[elt[j+2]];
 170       GLubyte ormask = c1|c2|c3;
 171       if (ormask) {
 172          if (start < j)
 173             render_tris( ctx, start, j, 0 );
 174          if (!(c1&c2&c3&0x3f))
 175             clip_tri_4( ctx, elt[j], elt[j+1], elt[j+2], ormask );
 176          start = j+3;
 177       }
 178    }
 179
 180    if (start < j)
 181       render_tris( ctx, start, j, 0 );
 182 }
 183
 184 /**********************************************************************/
 185 /*                  Render whole begin/end objects                    */
 186 /**********************************************************************/
 187
 188 #define NEED_EDGEFLAG_SETUP (ctx->_TriangleCaps & DD_TRI_UNFILLED)
 189 #define EDGEFLAG_GET(idx) VB->EdgeFlag[idx]
 190 #define EDGEFLAG_SET(idx, val) VB->EdgeFlag[idx] = val
 191
 192
 193 /* Vertices, no clipping.
 194  */
 195 #define RENDER_POINTS( start, count ) \
 196    tnl->Driver.Render.Points( ctx, start, count )
 197
 198 #define RENDER_LINE( v1, v2 ) \
 199    LineFunc( ctx, v1, v2 )
 200
 201 #define RENDER_TRI( v1, v2, v3 ) \
 202    TriangleFunc( ctx, v1, v2, v3 )
 203
 204 #define RENDER_QUAD( v1, v2, v3, v4 ) \
 205    QuadFunc( ctx, v1, v2, v3, v4 )
 206
 207 #define TAG(x) _tnl_##x##_verts
 208
 209 #define LOCAL_VARS                                              \
 210    TNLcontext *tnl = TNL_CONTEXT(ctx);                          \
 211    struct vertex_buffer *VB = &tnl->vb;                         \
 212    const GLuint * const elt = VB->Elts;                         \
 213    const line_func LineFunc = tnl->Driver.Render.Line;          \
 214    const triangle_func TriangleFunc = tnl->Driver.Render.Triangle;      \
 215    const quad_func QuadFunc = tnl->Driver.Render.Quad;          \
 216    const GLboolean stipple = ctx->Line.StippleFlag;             \
 217    (void) (LineFunc && TriangleFunc && QuadFunc);               \
 218    (void) elt; (void) stipple
 219
 220 #define RESET_STIPPLE if (stipple) tnl->Driver.Render.ResetLineStipple( ctx )
 221 #define RESET_OCCLUSION ctx->OcclusionResult = GL_TRUE
 222 #define INIT(x) tnl->Driver.Render.PrimitiveNotify( ctx, x )
 223 #define RENDER_TAB_QUALIFIER
 224 #define PRESERVE_VB_DEFS
 225 #include "t_vb_rendertmp.h"
 226
 227
 228 /* Elts, no clipping.
 229  */
 230 #undef ELT
 231 #define TAG(x) _tnl_##x##_elts
 232 #define ELT(x) elt[x]
 233 #include "t_vb_rendertmp.h"
 234
 235
 236 /**********************************************************************/
 237 /*              Helper functions for drivers                  */
 238 /**********************************************************************/
 239
 240 void _tnl_RenderClippedPolygon( GLcontext *ctx, const GLuint *elts, GLuint n )
 241 {
 242    TNLcontext *tnl = TNL_CONTEXT(ctx);
 243    struct vertex_buffer *VB = &tnl->vb;
 244    GLuint *tmp = VB->Elts;
 245
 246    VB->Elts = (GLuint *)elts;
 247    tnl->Driver.Render.PrimTabElts[GL_POLYGON]( ctx, 0, n, PRIM_BEGIN|PRIM_END );
 248    VB->Elts = tmp;
 249 }
 250
 251 void _tnl_RenderClippedLine( GLcontext *ctx, GLuint ii, GLuint jj )
 252 {
 253    TNLcontext *tnl = TNL_CONTEXT(ctx);
 254    tnl->Driver.Render.Line( ctx, ii, jj );
 255 }
 256
 257
 258
 259 /**********************************************************************/
 260 /*              Clip and render whole vertex buffers                  */
 261 /**********************************************************************/
 262
 263
 264 static GLboolean run_render( GLcontext *ctx,
 265                              struct gl_pipeline_stage *stage )
 266 {
 267    TNLcontext *tnl = TNL_CONTEXT(ctx);
 268    struct vertex_buffer *VB = &tnl->vb;
 269    GLuint new_inputs = stage->changed_inputs;
 270    render_func *tab;
 271    GLint pass = 0;
 272
 273    /* Allow the drivers to lock before projected verts are built so
 274     * that window coordinates are guarenteed not to change before
 275     * rendering.
 276     */
 277    ASSERT(tnl->Driver.Render.Start);
 278
 279    tnl->Driver.Render.Start( ctx );
 280
 281    ASSERT(tnl->Driver.Render.BuildVertices);
 282    ASSERT(tnl->Driver.Render.PrimitiveNotify);
 283    ASSERT(tnl->Driver.Render.Points);
 284    ASSERT(tnl->Driver.Render.Line);
 285    ASSERT(tnl->Driver.Render.Triangle);
 286    ASSERT(tnl->Driver.Render.Quad);
 287    ASSERT(tnl->Driver.Render.ResetLineStipple);
 288    ASSERT(tnl->Driver.Render.Interp);
 289    ASSERT(tnl->Driver.Render.CopyPV);
 290    ASSERT(tnl->Driver.Render.ClippedLine);
 291    ASSERT(tnl->Driver.Render.ClippedPolygon);
 292    ASSERT(tnl->Driver.Render.Finish);
 293
 294    tnl->Driver.Render.BuildVertices( ctx, 0, VB->Count, new_inputs );
 295
 296    if (VB->ClipOrMask) {
 297       tab = VB->Elts ? clip_render_tab_elts : clip_render_tab_verts;
 298       clip_render_tab_elts[GL_TRIANGLES] = clip_elt_triangles;
 299    }
 300    else {
 301       tab = (VB->Elts ?
 302              tnl->Driver.Render.PrimTabElts :
 303              tnl->Driver.Render.PrimTabVerts);
 304    }
 305
 306    do
 307    {
 308       GLuint i, length, flags = 0;
 309       for (i = VB->FirstPrimitive ; !(flags & PRIM_LAST) ; i += length)
 310       {
 311          flags = VB->Primitive[i];
 312          length= VB->PrimitiveLength[i];
 313          ASSERT(length || (flags & PRIM_LAST));
 314          ASSERT((flags & PRIM_MODE_MASK) <= GL_POLYGON+1);
 315
 316          if (MESA_VERBOSE & VERBOSE_PRIMS)
 317             _mesa_debug(NULL, "MESA prim %s %d..%d\n",
 318                     _mesa_lookup_enum_by_nr(flags & PRIM_MODE_MASK),
 319                     i, i+length);
 320
 321          if (length)
 322             tab[flags & PRIM_MODE_MASK]( ctx, i, i + length, flags );
 323       }
 324    } while (tnl->Driver.Render.Multipass &&
 325             tnl->Driver.Render.Multipass( ctx, ++pass ));
 326
 327
 328    tnl->Driver.Render.Finish( ctx );
 329 /*     _swrast_flush(ctx); */
 330 /*     usleep(1000000); */
 331    return GL_FALSE;             /* finished the pipe */
 332 }
 333
 334
 335 /**********************************************************************/
 336 /*                          Render pipeline stage                     */
 337 /**********************************************************************/
 338
 339
 340
 341 /* Quite a bit of work involved in finding out the inputs for the
 342  * render stage.
 343  */
 344 static void check_render( GLcontext *ctx, struct gl_pipeline_stage *stage )
 345 {
 346    GLuint inputs = VERT_BIT_CLIP;
 347    GLuint i;
 348
 349    if (ctx->Visual.rgbMode) {
 350       inputs |= VERT_BIT_COLOR0;
 351
 352       if (ctx->_TriangleCaps & DD_SEPARATE_SPECULAR)
 353          inputs |= VERT_BIT_COLOR1;
 354
 355       if (ctx->Texture._EnabledCoordUnits) {
 356          for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++) {
 357             if (ctx->Texture._EnabledCoordUnits & (1 << i))
 358                inputs |= VERT_BIT_TEX(i);
 359          }
 360       }
 361    }
 362    else {
 363       inputs |= VERT_BIT_INDEX;
 364    }
 365
 366    if (ctx->Point._Attenuated)
 367       inputs |= VERT_BIT_POINT_SIZE;
 368
 369    /* How do drivers turn this off?
 370     */
 371    if (ctx->Fog.Enabled)
 372       inputs |= VERT_BIT_FOG;
 373
 374    if (ctx->_TriangleCaps & DD_TRI_UNFILLED)
 375       inputs |= VERT_BIT_EDGEFLAG;
 376
 377    if (ctx->RenderMode==GL_FEEDBACK)
 378       inputs |= VERT_BITS_TEX_ANY;
 379
 380    stage->inputs = inputs;
 381 }
 382
 383
 384
 385
 386 static void dtr( struct gl_pipeline_stage *stage )
 387 {
 388 }
 389
 390
 391 const struct gl_pipeline_stage _tnl_render_stage =
 392 {
 393    "render",                    /* name */
 394    (_NEW_BUFFERS |
 395     _DD_NEW_SEPARATE_SPECULAR |
 396     _DD_NEW_FLATSHADE |
 397     _NEW_TEXTURE|
 398     _NEW_LIGHT|
 399     _NEW_POINT|
 400     _NEW_FOG|
 401     _DD_NEW_TRI_UNFILLED |
 402     _NEW_RENDERMODE),           /* re-check (new inputs, interp function) */
 403    0,                           /* re-run (always runs) */
 404    GL_TRUE,                     /* active? */
 405    0,                           /* inputs (set in check_render) */
 406    0,                           /* outputs */
 407    0,                           /* changed_inputs */
 408    NULL,                        /* private data */
 409    dtr,                         /* destructor */
 410    check_render,                /* check */
 411    run_render                   /* run */
 412 };