src/mesa/tnl/t_vb_render.c

   1 /* $Id: t_vb_render.c,v 1.27 2002/01/22 14:35:17 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  4.0.1
   6  *
   7  * Copyright (C) 1999-2001  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 <keithw@valinux.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 "macros.h"
  46 #include "mem.h"
  47 #include "mtypes.h"
  48 #include "mmath.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 #if defined(USE_IEEE)
  63 #define NEGATIVE(x) (GET_FLOAT_BITS(x) & (1<<31))
  64 #define DIFFERENT_SIGNS(x,y) ((GET_FLOAT_BITS(x) ^ GET_FLOAT_BITS(y)) & (1<<31))
  65 #else
  66 #define NEGATIVE(x) (x < 0)
  67 #define DIFFERENT_SIGNS(x,y) (x * y <= 0 && x - y != 0)
  68 /* Could just use (x*y<0) except for the flatshading requirements.
  69  * Maybe there's a better way?
  70  */
  71 #endif
  72
  73
  74 #define W(i) coord[i][3]
  75 #define Z(i) coord[i][2]
  76 #define Y(i) coord[i][1]
  77 #define X(i) coord[i][0]
  78 #define SIZE 4
  79 #define TAG(x) x##_4
  80 #include "t_vb_cliptmp.h"
  81
  82
  83
  84 /**********************************************************************/
  85 /*              Clip and render whole begin/end objects               */
  86 /**********************************************************************/
  87
  88 #define NEED_EDGEFLAG_SETUP (ctx->_TriangleCaps & DD_TRI_UNFILLED)
  89 #define EDGEFLAG_GET(idx) VB->EdgeFlag[idx]
  90 #define EDGEFLAG_SET(idx, val) VB->EdgeFlag[idx] = val
  91
  92
  93 /* Vertices, with the possibility of clipping.
  94  */
  95 #define RENDER_POINTS( start, count ) \
  96    tnl->Driver.Render.Points( ctx, start, count )
  97
  98 #define RENDER_LINE( v1, v2 )                   \
  99 do {                                            \
 100    GLubyte c1 = mask[v1], c2 = mask[v2];        \
 101    GLubyte ormask = c1|c2;                      \
 102    if (!ormask)                                 \
 103       LineFunc( ctx, v1, v2 );                  \
 104    else if (!(c1 & c2 & 0x3f))                  \
 105       clip_line_4( ctx, v1, v2, ormask );       \
 106 } while (0)
 107
 108 #define RENDER_TRI( v1, v2, v3 )                        \
 109 do {                                                    \
 110    GLubyte c1 = mask[v1], c2 = mask[v2], c3 = mask[v3]; \
 111    GLubyte ormask = c1|c2|c3;                           \
 112    if (!ormask)                                         \
 113       TriangleFunc( ctx, v1, v2, v3 );                  \
 114    else if (!(c1 & c2 & c3 & 0x3f))                     \
 115       clip_tri_4( ctx, v1, v2, v3, ormask );            \
 116 } while (0)
 117
 118 #define RENDER_QUAD( v1, v2, v3, v4 )                   \
 119 do {                                                    \
 120    GLubyte c1 = mask[v1], c2 = mask[v2];                \
 121    GLubyte c3 = mask[v3], c4 = mask[v4];                \
 122    GLubyte ormask = c1|c2|c3|c4;                        \
 123    if (!ormask)                                         \
 124       QuadFunc( ctx, v1, v2, v3, v4 );                  \
 125    else if (!(c1 & c2 & c3 & c4 & 0x3f))                \
 126       clip_quad_4( ctx, v1, v2, v3, v4, ormask );       \
 127 } while (0)
 128
 129
 130 #define LOCAL_VARS                                              \
 131    TNLcontext *tnl = TNL_CONTEXT(ctx);                          \
 132    struct vertex_buffer *VB = &tnl->vb;                         \
 133    const GLuint * const elt = VB->Elts;                         \
 134    const GLubyte *mask = VB->ClipMask;                          \
 135    const GLuint sz = VB->ClipPtr->size;                         \
 136    const line_func LineFunc = tnl->Driver.Render.Line;          \
 137    const triangle_func TriangleFunc = tnl->Driver.Render.Triangle;      \
 138    const quad_func QuadFunc = tnl->Driver.Render.Quad;          \
 139    const GLboolean stipple = ctx->Line.StippleFlag;             \
 140    (void) (LineFunc && TriangleFunc && QuadFunc);               \
 141    (void) elt; (void) mask; (void) sz; (void) stipple;
 142
 143 #define TAG(x) clip_##x##_verts
 144 #define INIT(x) tnl->Driver.Render.PrimitiveNotify( ctx, x )
 145 #define RESET_STIPPLE tnl->Driver.Render.ResetLineStipple( ctx )
 146 #define RESET_OCCLUSION ctx->OcclusionResult = GL_TRUE
 147 #define PRESERVE_VB_DEFS
 148 #include "t_vb_rendertmp.h"
 149
 150
 151
 152 /* Elts, with the possibility of clipping.
 153  */
 154 #undef ELT
 155 #undef TAG
 156 #define ELT(x) elt[x]
 157 #define TAG(x) clip_##x##_elts
 158 #include "t_vb_rendertmp.h"
 159
 160 /* TODO: do this for all primitives, verts and elts:
 161  */
 162 static void clip_elt_triangles( GLcontext *ctx,
 163                                 GLuint start,
 164                                 GLuint count,
 165                                 GLuint flags )
 166 {
 167    TNLcontext *tnl = TNL_CONTEXT(ctx);
 168    render_func render_tris = tnl->Driver.Render.PrimTabElts[GL_TRIANGLES];
 169    struct vertex_buffer *VB = &tnl->vb;
 170    const GLuint * const elt = VB->Elts;
 171    GLubyte *mask = VB->ClipMask;
 172    GLuint last = count-2;
 173    GLuint j;
 174    (void) flags;
 175
 176    tnl->Driver.Render.PrimitiveNotify( ctx, GL_TRIANGLES );
 177
 178    for (j=start; j < last; j+=3 ) {
 179       GLubyte c1 = mask[elt[j]];
 180       GLubyte c2 = mask[elt[j+1]];
 181       GLubyte c3 = mask[elt[j+2]];
 182       GLubyte ormask = c1|c2|c3;
 183       if (ormask) {
 184          if (start < j)
 185             render_tris( ctx, start, j, 0 );
 186          if (!(c1&c2&c3&0x3f))
 187             clip_tri_4( ctx, elt[j], elt[j+1], elt[j+2], ormask );
 188          start = j+3;
 189       }
 190    }
 191
 192    if (start < j)
 193       render_tris( ctx, start, j, 0 );
 194 }
 195
 196 /**********************************************************************/
 197 /*                  Render whole begin/end objects                    */
 198 /**********************************************************************/
 199
 200 #define NEED_EDGEFLAG_SETUP (ctx->_TriangleCaps & DD_TRI_UNFILLED)
 201 #define EDGEFLAG_GET(idx) VB->EdgeFlag[idx]
 202 #define EDGEFLAG_SET(idx, val) VB->EdgeFlag[idx] = val
 203
 204
 205 /* Vertices, no clipping.
 206  */
 207 #define RENDER_POINTS( start, count ) \
 208    tnl->Driver.Render.Points( ctx, start, count )
 209
 210 #define RENDER_LINE( v1, v2 ) \
 211    LineFunc( ctx, v1, v2 )
 212
 213 #define RENDER_TRI( v1, v2, v3 ) \
 214    TriangleFunc( ctx, v1, v2, v3 )
 215
 216 #define RENDER_QUAD( v1, v2, v3, v4 ) \
 217    QuadFunc( ctx, v1, v2, v3, v4 )
 218
 219 #define TAG(x) _tnl_##x##_verts
 220
 221 #define LOCAL_VARS                                              \
 222    TNLcontext *tnl = TNL_CONTEXT(ctx);                          \
 223    struct vertex_buffer *VB = &tnl->vb;                         \
 224    const GLuint * const elt = VB->Elts;                         \
 225    const line_func LineFunc = tnl->Driver.Render.Line;          \
 226    const triangle_func TriangleFunc = tnl->Driver.Render.Triangle;      \
 227    const quad_func QuadFunc = tnl->Driver.Render.Quad;          \
 228    const GLboolean stipple = ctx->Line.StippleFlag;             \
 229    (void) (LineFunc && TriangleFunc && QuadFunc);               \
 230    (void) elt; (void) stipple
 231
 232 #define RESET_STIPPLE tnl->Driver.Render.ResetLineStipple( ctx )
 233 #define RESET_OCCLUSION ctx->OcclusionResult = GL_TRUE
 234 #define INIT(x) tnl->Driver.Render.PrimitiveNotify( ctx, x )
 235 #define RENDER_TAB_QUALIFIER
 236 #define PRESERVE_VB_DEFS
 237 #include "t_vb_rendertmp.h"
 238
 239
 240 /* Elts, no clipping.
 241  */
 242 #undef ELT
 243 #define TAG(x) _tnl_##x##_elts
 244 #define ELT(x) elt[x]
 245 #include "t_vb_rendertmp.h"
 246
 247
 248 /**********************************************************************/
 249 /*              Helper functions for drivers                  */
 250 /**********************************************************************/
 251
 252 void _tnl_RenderClippedPolygon( GLcontext *ctx, const GLuint *elts, GLuint n )
 253 {
 254    TNLcontext *tnl = TNL_CONTEXT(ctx);
 255    struct vertex_buffer *VB = &tnl->vb;
 256    GLuint *tmp = VB->Elts;
 257
 258    VB->Elts = (GLuint *)elts;
 259    tnl->Driver.Render.PrimTabElts[GL_POLYGON]( ctx, 0, n, PRIM_BEGIN|PRIM_END );
 260    VB->Elts = tmp;
 261 }
 262
 263 void _tnl_RenderClippedLine( GLcontext *ctx, GLuint ii, GLuint jj )
 264 {
 265    TNLcontext *tnl = TNL_CONTEXT(ctx);
 266    tnl->Driver.Render.Line( ctx, ii, jj );
 267 }
 268
 269
 270
 271 /**********************************************************************/
 272 /*              Clip and render whole vertex buffers                  */
 273 /**********************************************************************/
 274
 275
 276 static GLboolean run_render( GLcontext *ctx,
 277                              struct gl_pipeline_stage *stage )
 278 {
 279    TNLcontext *tnl = TNL_CONTEXT(ctx);
 280    struct vertex_buffer *VB = &tnl->vb;
 281    GLuint new_inputs = stage->changed_inputs;
 282    render_func *tab;
 283    GLint pass = 0;
 284
 285    /* Allow the drivers to lock before projected verts are built so
 286     * that window coordinates are guarenteed not to change before
 287     * rendering.
 288     */
 289    ASSERT(tnl->Driver.Render.Start);
 290
 291    tnl->Driver.Render.Start( ctx );
 292
 293    ASSERT(tnl->Driver.Render.BuildVertices);
 294    ASSERT(tnl->Driver.Render.PrimitiveNotify);
 295    ASSERT(tnl->Driver.Render.Points);
 296    ASSERT(tnl->Driver.Render.Line);
 297    ASSERT(tnl->Driver.Render.Triangle);
 298    ASSERT(tnl->Driver.Render.Quad);
 299    ASSERT(tnl->Driver.Render.ResetLineStipple);
 300    ASSERT(tnl->Driver.Render.Interp);
 301    ASSERT(tnl->Driver.Render.CopyPV);
 302    ASSERT(tnl->Driver.Render.ClippedLine);
 303    ASSERT(tnl->Driver.Render.ClippedPolygon);
 304    ASSERT(tnl->Driver.Render.Finish);
 305
 306    tnl->Driver.Render.BuildVertices( ctx, 0, VB->Count, new_inputs );
 307
 308    if (VB->ClipOrMask) {
 309       tab = VB->Elts ? clip_render_tab_elts : clip_render_tab_verts;
 310       clip_render_tab_elts[GL_TRIANGLES] = clip_elt_triangles;
 311    }
 312    else {
 313       tab = (VB->Elts ?
 314              tnl->Driver.Render.PrimTabElts :
 315              tnl->Driver.Render.PrimTabVerts);
 316    }
 317
 318    do
 319    {
 320       GLuint i, length, flags = 0;
 321       for (i = VB->FirstPrimitive ; !(flags & PRIM_LAST) ; i += length)
 322       {
 323          flags = VB->Primitive[i];
 324          length= VB->PrimitiveLength[i];
 325          ASSERT(length || (flags & PRIM_LAST));
 326          ASSERT((flags & PRIM_MODE_MASK) <= GL_POLYGON+1);
 327          if (length)
 328             tab[flags & PRIM_MODE_MASK]( ctx, i, i + length, flags );
 329       }
 330    } while (tnl->Driver.Render.Multipass &&
 331             tnl->Driver.Render.Multipass( ctx, ++pass ));
 332
 333
 334    tnl->Driver.Render.Finish( ctx );
 335 /*     _swrast_flush(ctx); */
 336 /*     usleep(1000000); */
 337    return GL_FALSE;             /* finished the pipe */
 338 }
 339
 340
 341 /**********************************************************************/
 342 /*                          Render pipeline stage                     */
 343 /**********************************************************************/
 344
 345
 346
 347 /* Quite a bit of work involved in finding out the inputs for the
 348  * render stage.
 349  */
 350 static void check_render( GLcontext *ctx, struct gl_pipeline_stage *stage )
 351 {
 352    GLuint inputs = VERT_BIT_CLIP;
 353    GLuint i;
 354
 355    if (ctx->Visual.rgbMode) {
 356       inputs |= VERT_BIT_COLOR0;
 357
 358       if (ctx->_TriangleCaps & DD_SEPARATE_SPECULAR)
 359          inputs |= VERT_BIT_COLOR1;
 360
 361       if (ctx->Texture._ReallyEnabled) {
 362          for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++) {
 363             if (ctx->Texture.Unit[i]._ReallyEnabled)
 364                inputs |= VERT_BIT_TEX(i);
 365          }
 366       }
 367    }
 368    else {
 369       inputs |= VERT_BIT_INDEX;
 370    }
 371
 372    if (ctx->Point._Attenuated)
 373       inputs |= VERT_BIT_POINT_SIZE;
 374
 375    /* How do drivers turn this off?
 376     */
 377    if (ctx->Fog.Enabled)
 378       inputs |= VERT_BIT_FOG;
 379
 380    if (ctx->_TriangleCaps & DD_TRI_UNFILLED)
 381       inputs |= VERT_BIT_EDGEFLAG;
 382
 383    if (ctx->RenderMode==GL_FEEDBACK)
 384       inputs |= VERT_BITS_TEX_ANY;
 385
 386    stage->inputs = inputs;
 387 }
 388
 389
 390
 391
 392 static void dtr( struct gl_pipeline_stage *stage )
 393 {
 394 }
 395
 396
 397 const struct gl_pipeline_stage _tnl_render_stage =
 398 {
 399    "render",                    /* name */
 400    (_NEW_BUFFERS |
 401     _DD_NEW_SEPARATE_SPECULAR |
 402     _DD_NEW_FLATSHADE |
 403     _NEW_TEXTURE|
 404     _NEW_LIGHT|
 405     _NEW_POINT|
 406     _NEW_FOG|
 407     _DD_NEW_TRI_UNFILLED |
 408     _NEW_RENDERMODE),           /* re-check (new inputs, interp function) */
 409    0,                           /* re-run (always runs) */
 410    GL_TRUE,                     /* active? */
 411    0,                           /* inputs (set in check_render) */
 412    0,                           /* outputs */
 413    0,                           /* changed_inputs */
 414    NULL,                        /* private data */
 415    dtr,                         /* destructor */
 416    check_render,                /* check */
 417    run_render                   /* run */
 418 };