src/mesa/tnl/t_vb_render.c

   1 /* $Id: t_vb_render.c,v 1.19 2001/04/28 08:39:18 keithw Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   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.BuildProjectedVertices()
  39  *
  40  *    context->Driver.PointsFunc()
  41  *    context->Driver.LineFunc()
  42  *    context->Driver.TriangleFunc()
  43  *    context->Driver.QuadFunc()
  44  *
  45  *    context->Driver.RenderTabVerts[]
  46  *    context->Driver.RenderTabElts[]
  47  *
  48  * None of these may be null.
  49  */
  50
  51
  52 #include "glheader.h"
  53 #include "context.h"
  54 #include "macros.h"
  55 #include "mem.h"
  56 #include "mtypes.h"
  57 #include "mmath.h"
  58
  59 #include "math/m_matrix.h"
  60 #include "math/m_xform.h"
  61
  62 #include "t_pipeline.h"
  63
  64
  65
  66 /**********************************************************************/
  67 /*                        Clip single primitives                      */
  68 /**********************************************************************/
  69
  70
  71 #if defined(USE_IEEE)
  72 #define NEGATIVE(x) ((*(GLuint *)&x) & (1<<31))
  73 #define DIFFERENT_SIGNS(x,y) (((*(GLuint *)&x)^(*(GLuint *)&y)) & (1<<31))
  74 #else
  75 #define NEGATIVE(x) (x < 0)
  76 #define DIFFERENT_SIGNS(x,y) (x * y <= 0 && x - y != 0)
  77 /* Could just use (x*y<0) except for the flatshading requirements.
  78  * Maybe there's a better way?
  79  */
  80 #endif
  81
  82
  83 #define W(i) coord[i][3]
  84 #define Z(i) coord[i][2]
  85 #define Y(i) coord[i][1]
  86 #define X(i) coord[i][0]
  87 #define SIZE 4
  88 #define TAG(x) x##_4
  89 #include "t_vb_cliptmp.h"
  90
  91
  92
  93 /**********************************************************************/
  94 /*              Clip and render whole begin/end objects               */
  95 /**********************************************************************/
  96
  97 #define NEED_EDGEFLAG_SETUP (ctx->_TriangleCaps & DD_TRI_UNFILLED)
  98 #define EDGEFLAG_GET(idx) VB->EdgeFlag[idx]
  99 #define EDGEFLAG_SET(idx, val) VB->EdgeFlag[idx] = val
 100
 101
 102 /* Vertices, with the possibility of clipping.
 103  */
 104 #define RENDER_POINTS( start, count ) \
 105    tnl->Driver.PointsFunc( ctx, start, count )
 106
 107 #define RENDER_LINE( v1, v2 )                   \
 108 do {                                            \
 109    GLubyte c1 = mask[v1], c2 = mask[v2];        \
 110    GLubyte ormask = c1|c2;                      \
 111    if (!ormask)                                 \
 112       LineFunc( ctx, v1, v2 );                  \
 113    else if (!(c1 & c2 & 0x3f))                  \
 114       clip_line_4( ctx, v1, v2, ormask );       \
 115 } while (0)
 116
 117 #define RENDER_TRI( v1, v2, v3 )                        \
 118 do {                                                    \
 119    GLubyte c1 = mask[v1], c2 = mask[v2], c3 = mask[v3]; \
 120    GLubyte ormask = c1|c2|c3;                           \
 121    if (!ormask)                                         \
 122       TriangleFunc( ctx, v1, v2, v3 );                  \
 123    else if (!(c1 & c2 & c3 & 0x3f))                     \
 124       clip_tri_4( ctx, v1, v2, v3, ormask );            \
 125 } while (0)
 126
 127 #define RENDER_QUAD( v1, v2, v3, v4 )                   \
 128 do {                                                    \
 129    GLubyte c1 = mask[v1], c2 = mask[v2];                \
 130    GLubyte c3 = mask[v3], c4 = mask[v4];                \
 131    GLubyte ormask = c1|c2|c3|c4;                        \
 132    if (!ormask)                                         \
 133       QuadFunc( ctx, v1, v2, v3, v4 );                  \
 134    else if (!(c1 & c2 & c3 & c4 & 0x3f))                \
 135       clip_quad_4( ctx, v1, v2, v3, v4, ormask );       \
 136 } while (0)
 137
 138
 139 #define LOCAL_VARS                                              \
 140    TNLcontext *tnl = TNL_CONTEXT(ctx);                          \
 141    struct vertex_buffer *VB = &tnl->vb;                         \
 142    const GLuint * const elt = VB->Elts;                         \
 143    const GLubyte *mask = VB->ClipMask;                          \
 144    const GLuint sz = VB->ClipPtr->size;                         \
 145    const line_func LineFunc = tnl->Driver.LineFunc;             \
 146    const triangle_func TriangleFunc = tnl->Driver.TriangleFunc; \
 147    const quad_func QuadFunc = tnl->Driver.QuadFunc;             \
 148    const GLboolean stipple = ctx->Line.StippleFlag;             \
 149    (void) (LineFunc && TriangleFunc && QuadFunc);               \
 150    (void) elt; (void) mask; (void) sz; (void) stipple;
 151
 152 #define TAG(x) clip_##x##_verts
 153 #define INIT(x) tnl->Driver.RenderPrimitive( ctx, x )
 154 #define RESET_STIPPLE if (stipple) tnl->Driver.ResetLineStipple( ctx )
 155 #define RESET_OCCLUSION ctx->OcclusionResult = GL_TRUE
 156 #define PRESERVE_VB_DEFS
 157 #include "t_vb_rendertmp.h"
 158
 159
 160
 161 /* Elts, with the possibility of clipping.
 162  */
 163 #undef ELT
 164 #undef TAG
 165 #define ELT(x) elt[x]
 166 #define TAG(x) clip_##x##_elts
 167 #include "t_vb_rendertmp.h"
 168
 169 /* TODO: do this for all primitives, verts and elts:
 170  */
 171 static void clip_elt_triangles( GLcontext *ctx,
 172                                 GLuint start,
 173                                 GLuint count,
 174                                 GLuint flags )
 175 {
 176    TNLcontext *tnl = TNL_CONTEXT(ctx);
 177    render_func render_tris = tnl->Driver.RenderTabElts[GL_TRIANGLES];
 178    struct vertex_buffer *VB = &tnl->vb;
 179    const GLuint * const elt = VB->Elts;
 180    GLubyte *mask = VB->ClipMask;
 181    GLuint last = count-2;
 182    GLuint j;
 183    (void) flags;
 184
 185    tnl->Driver.RenderPrimitive( ctx, GL_TRIANGLES );
 186
 187    for (j=start; j < last; j+=3 ) {
 188       GLubyte c1 = mask[elt[j]];
 189       GLubyte c2 = mask[elt[j+1]];
 190       GLubyte c3 = mask[elt[j+2]];
 191       GLubyte ormask = c1|c2|c3;
 192       if (ormask) {
 193          if (start < j)
 194             render_tris( ctx, start, j, 0 );
 195          if (!(c1&c2&c3&0x3f))
 196             clip_tri_4( ctx, elt[j], elt[j+1], elt[j+2], ormask );
 197          start = j+3;
 198       }
 199    }
 200
 201    if (start < j)
 202       render_tris( ctx, start, j, 0 );
 203 }
 204
 205 /**********************************************************************/
 206 /*                  Render whole begin/end objects                    */
 207 /**********************************************************************/
 208
 209 #define NEED_EDGEFLAG_SETUP (ctx->_TriangleCaps & DD_TRI_UNFILLED)
 210 #define EDGEFLAG_GET(idx) VB->EdgeFlag[idx]
 211 #define EDGEFLAG_SET(idx, val) VB->EdgeFlag[idx] = val
 212
 213
 214 /* Vertices, no clipping.
 215  */
 216 #define RENDER_POINTS( start, count ) \
 217    tnl->Driver.PointsFunc( ctx, start, count )
 218
 219 #define RENDER_LINE( v1, v2 ) \
 220    LineFunc( ctx, v1, v2 )
 221
 222 #define RENDER_TRI( v1, v2, v3 ) \
 223    TriangleFunc( ctx, v1, v2, v3 )
 224
 225 #define RENDER_QUAD( v1, v2, v3, v4 ) \
 226    QuadFunc( ctx, v1, v2, v3, v4 )
 227
 228 #define TAG(x) _tnl_##x##_verts
 229
 230 #define LOCAL_VARS                                              \
 231    TNLcontext *tnl = TNL_CONTEXT(ctx);                          \
 232    struct vertex_buffer *VB = &tnl->vb;                         \
 233    const GLuint * const elt = VB->Elts;                         \
 234    const line_func LineFunc = tnl->Driver.LineFunc;             \
 235    const triangle_func TriangleFunc = tnl->Driver.TriangleFunc; \
 236    const quad_func QuadFunc = tnl->Driver.QuadFunc;             \
 237    (void) (LineFunc && TriangleFunc && QuadFunc);               \
 238    (void) elt;
 239
 240 #define RESET_STIPPLE tnl->Driver.ResetLineStipple( ctx )
 241 #define RESET_OCCLUSION ctx->OcclusionResult = GL_TRUE
 242 #define INIT(x) tnl->Driver.RenderPrimitive( ctx, x )
 243 #define RENDER_TAB_QUALIFIER
 244 #define PRESERVE_VB_DEFS
 245 #include "t_vb_rendertmp.h"
 246
 247
 248 /* Elts, no clipping.
 249  */
 250 #undef ELT
 251 #define TAG(x) _tnl_##x##_elts
 252 #define ELT(x) elt[x]
 253 #include "t_vb_rendertmp.h"
 254
 255
 256
 257
 258 /**********************************************************************/
 259 /*              Clip and render whole vertex buffers                  */
 260 /**********************************************************************/
 261
 262
 263 static GLboolean run_render( GLcontext *ctx,
 264                              struct gl_pipeline_stage *stage )
 265 {
 266    TNLcontext *tnl = TNL_CONTEXT(ctx);
 267    struct vertex_buffer *VB = &tnl->vb;
 268    GLuint new_inputs = stage->changed_inputs;
 269    render_func *tab;
 270    GLint pass = 0;
 271
 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.RenderStart);
 278
 279    tnl->Driver.RenderStart( ctx );
 280
 281    ASSERT(tnl->Driver.BuildProjectedVertices);
 282    ASSERT(tnl->Driver.RenderPrimitive);
 283    ASSERT(tnl->Driver.PointsFunc);
 284    ASSERT(tnl->Driver.LineFunc);
 285    ASSERT(tnl->Driver.TriangleFunc);
 286    ASSERT(tnl->Driver.QuadFunc);
 287    ASSERT(tnl->Driver.ResetLineStipple);
 288    ASSERT(tnl->Driver.RenderInterp);
 289    ASSERT(tnl->Driver.RenderCopyPV);
 290    ASSERT(tnl->Driver.RenderClippedLine);
 291    ASSERT(tnl->Driver.RenderClippedPolygon);
 292    ASSERT(tnl->Driver.RenderFinish);
 293
 294    tnl->Driver.BuildProjectedVertices( 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 ? tnl->Driver.RenderTabElts : tnl->Driver.RenderTabVerts;
 302    }
 303
 304    do
 305    {
 306       GLuint i, length, flags = 0;
 307       for (i = 0 ; !(flags & PRIM_LAST) ; i += length)
 308       {
 309          flags = VB->Primitive[i];
 310          length= VB->PrimitiveLength[i];
 311          ASSERT(length || (flags & PRIM_LAST));
 312          ASSERT((flags & PRIM_MODE_MASK) <= GL_POLYGON+1);
 313          if (length)
 314             tab[flags & PRIM_MODE_MASK]( ctx, i, i + length, flags );
 315       }
 316    } while (tnl->Driver.MultipassFunc &&
 317             tnl->Driver.MultipassFunc( ctx, ++pass ));
 318
 319
 320    tnl->Driver.RenderFinish( ctx );
 321 /*     usleep(100000); */
 322    return GL_FALSE;             /* finished the pipe */
 323 }
 324
 325
 326 /**********************************************************************/
 327 /*                          Render pipeline stage                     */
 328 /**********************************************************************/
 329
 330
 331
 332 /* Quite a bit of work involved in finding out the inputs for the
 333  * render stage.
 334  */
 335 static void check_render( GLcontext *ctx, struct gl_pipeline_stage *stage )
 336 {
 337    GLuint inputs = VERT_CLIP;
 338    GLuint i;
 339
 340    if (ctx->Visual.rgbMode) {
 341       inputs |= VERT_RGBA;
 342
 343       if (ctx->_TriangleCaps & DD_SEPARATE_SPECULAR)
 344          inputs |= VERT_SPEC_RGB;
 345
 346       if (ctx->Texture._ReallyEnabled) {
 347          for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++) {
 348             if (ctx->Texture.Unit[i]._ReallyEnabled)
 349                inputs |= VERT_TEX(i);
 350          }
 351       }
 352    }
 353    else {
 354       inputs |= VERT_INDEX;
 355    }
 356
 357    if (ctx->Point._Attenuated)
 358       inputs |= VERT_POINT_SIZE;
 359
 360    /* How do drivers turn this off?
 361     */
 362    if (ctx->Fog.Enabled)
 363       inputs |= VERT_FOG_COORD;
 364
 365    if (ctx->_TriangleCaps & DD_TRI_UNFILLED)
 366       inputs |= VERT_EDGE;
 367
 368    if (ctx->RenderMode==GL_FEEDBACK)
 369       inputs |= VERT_TEX_ANY;
 370
 371    stage->inputs = inputs;
 372 }
 373
 374
 375
 376
 377 static void dtr( struct gl_pipeline_stage *stage )
 378 {
 379 }
 380
 381
 382 const struct gl_pipeline_stage _tnl_render_stage =
 383 {
 384    "render",
 385    (_NEW_BUFFERS |
 386     _DD_NEW_SEPARATE_SPECULAR |
 387     _DD_NEW_FLATSHADE |
 388     _NEW_TEXTURE|
 389     _NEW_LIGHT|
 390     _NEW_POINT|
 391     _NEW_FOG|
 392     _DD_NEW_TRI_UNFILLED |
 393     _NEW_RENDERMODE),           /* re-check (new inputs, interp function) */
 394    0,                           /* re-run (always runs) */
 395    GL_TRUE,                     /* active */
 396    0, 0,                        /* inputs (set in check_render), outputs */
 397    0, 0,                        /* changed_inputs, private */
 398    dtr,                         /* destructor */
 399    check_render,                /* check */
 400    run_render                   /* run */
 401 };