src/mesa/swrast_setup/ss_context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keith@tungstengraphics.com>
  26  */
  27
  28 #include "glheader.h"
  29 #include "imports.h"
  30 #include "colormac.h"
  31 #include "ss_context.h"
  32 #include "ss_triangle.h"
  33 #include "swrast_setup.h"
  34 #include "tnl/tnl.h"
  35 #include "tnl/t_context.h"
  36 #include "tnl/t_pipeline.h"
  37 #include "tnl/t_vertex.h"
  38
  39 /* Need to check lighting state and vertex program state to know
  40  * if two-sided lighting is in effect.
  41  */
  42 #define _SWSETUP_NEW_RENDERINDEX (_NEW_POLYGON|_NEW_LIGHT|_NEW_PROGRAM)
  43
  44
  45 #define VARYING_EMIT_STYLE  EMIT_4F
  46
  47
  48 GLboolean
  49 _swsetup_CreateContext( GLcontext *ctx )
  50 {
  51    SScontext *swsetup = (SScontext *)CALLOC(sizeof(SScontext));
  52
  53    if (!swsetup)
  54       return GL_FALSE;
  55
  56    ctx->swsetup_context = swsetup;
  57
  58    swsetup->NewState = ~0;
  59    _swsetup_trifuncs_init( ctx );
  60
  61    _tnl_init_vertices( ctx, ctx->Const.MaxArrayLockSize + 12,
  62                        sizeof(SWvertex) );
  63
  64
  65    return GL_TRUE;
  66 }
  67
  68 void
  69 _swsetup_DestroyContext( GLcontext *ctx )
  70 {
  71    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
  72
  73    if (swsetup) {
  74       FREE(swsetup);
  75       ctx->swsetup_context = 0;
  76    }
  77
  78    _tnl_free_vertices( ctx );
  79 }
  80
  81 static void
  82 _swsetup_RenderPrimitive( GLcontext *ctx, GLenum mode )
  83 {
  84    SWSETUP_CONTEXT(ctx)->render_prim = mode;
  85    _swrast_render_primitive( ctx, mode );
  86 }
  87
  88
  89 /**
  90  * Helper macros for setup_vertex_format()
  91  */
  92 #define SWZ ((SWvertex *)0)
  93 #define SWOffset(MEMBER) (((char *)&(SWZ->MEMBER)) - ((char *)SWZ))
  94
  95 #define EMIT_ATTR( ATTR, STYLE, MEMBER )        \
  96 do {                                            \
  97    map[e].attrib = (ATTR);                      \
  98    map[e].format = (STYLE);                     \
  99    map[e].offset = SWOffset(MEMBER);            \
 100    e++;                                         \
 101 } while (0)
 102
 103
 104 /**
 105  * Tell the tnl module how to build SWvertex objects for swrast.
 106  * We'll build the map[] array with that info and pass it to
 107  * _tnl_install_attrs().
 108  */
 109 static void
 110 setup_vertex_format(GLcontext *ctx)
 111 {
 112    TNLcontext *tnl = TNL_CONTEXT(ctx);
 113    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 114
 115    if (!RENDERINPUTS_EQUAL(tnl->render_inputs_bitset,
 116                            swsetup->last_index_bitset)) {
 117       DECLARE_RENDERINPUTS(index_bitset);
 118       struct tnl_attr_map map[_TNL_ATTRIB_MAX];
 119       int i, e = 0;
 120
 121       RENDERINPUTS_COPY( index_bitset, tnl->render_inputs_bitset );
 122
 123       EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_4F_VIEWPORT, attrib[FRAG_ATTRIB_WPOS] );
 124
 125       if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR0 )) {
 126          swsetup->intColors = !ctx->FragmentProgram._Current
 127                            && !ctx->ATIFragmentShader._Enabled
 128                            && ctx->RenderMode == GL_RENDER
 129                            && CHAN_TYPE == GL_UNSIGNED_BYTE;
 130          if (swsetup->intColors)
 131             EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4CHAN_4F_RGBA, color );
 132          else
 133             EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4F, attrib[FRAG_ATTRIB_COL0]);
 134       }
 135
 136       if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR1 )) {
 137          EMIT_ATTR( _TNL_ATTRIB_COLOR1, EMIT_4F, attrib[FRAG_ATTRIB_COL1]);
 138       }
 139
 140       if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR_INDEX )) {
 141          EMIT_ATTR( _TNL_ATTRIB_COLOR_INDEX, EMIT_1F,
 142                     attrib[FRAG_ATTRIB_CI][0] );
 143       }
 144
 145       if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_FOG )) {
 146          const GLint emit = ctx->FragmentProgram._Current ? EMIT_4F : EMIT_1F;
 147          EMIT_ATTR( _TNL_ATTRIB_FOG, emit, attrib[FRAG_ATTRIB_FOGC]);
 148       }
 149
 150       if (RENDERINPUTS_TEST_RANGE(index_bitset, _TNL_FIRST_TEX, _TNL_LAST_TEX))
 151       {
 152          for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
 153             if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_TEX(i) )) {
 154                EMIT_ATTR( _TNL_ATTRIB_TEX(i), EMIT_4F,
 155                           attrib[FRAG_ATTRIB_TEX0 + i] );
 156             }
 157          }
 158       }
 159
 160       /* shader varying vars */
 161       if (RENDERINPUTS_TEST_RANGE( index_bitset,
 162                                    _TNL_FIRST_GENERIC, _TNL_LAST_GENERIC )) {
 163          for (i = 0; i < ctx->Const.MaxVarying; i++) {
 164             if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_GENERIC(i) )) {
 165                EMIT_ATTR( _TNL_ATTRIB_GENERIC(i), VARYING_EMIT_STYLE,
 166                           attrib[FRAG_ATTRIB_VAR0 + i] );
 167             }
 168          }
 169       }
 170
 171       if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_POINTSIZE ))
 172          EMIT_ATTR( _TNL_ATTRIB_POINTSIZE, EMIT_1F, pointSize );
 173
 174       _tnl_install_attrs( ctx, map, e,
 175                           ctx->Viewport._WindowMap.m,
 176                           sizeof(SWvertex) );
 177
 178       RENDERINPUTS_COPY( swsetup->last_index_bitset, index_bitset );
 179    }
 180 }
 181
 182
 183 /**
 184  * Prepare to render a vertex buffer.
 185  * Called via tnl->Driver.Render.Start.
 186  */
 187 static void
 188 _swsetup_RenderStart( GLcontext *ctx )
 189 {
 190    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 191    TNLcontext *tnl = TNL_CONTEXT(ctx);
 192    struct vertex_buffer *VB = &tnl->vb;
 193
 194    if (swsetup->NewState & _SWSETUP_NEW_RENDERINDEX) {
 195       _swsetup_choose_trifuncs(ctx);
 196    }
 197
 198    if (swsetup->NewState & _NEW_PROGRAM) {
 199       RENDERINPUTS_ZERO( swsetup->last_index_bitset );
 200    }
 201
 202    swsetup->NewState = 0;
 203
 204    _swrast_render_start(ctx);
 205
 206    /* Important */
 207    VB->AttribPtr[VERT_ATTRIB_POS] = VB->NdcPtr;
 208
 209    setup_vertex_format(ctx);
 210 }
 211
 212
 213 /*
 214  * We patch this function into tnl->Driver.Render.Finish.
 215  * It's called when we finish rendering a vertex buffer.
 216  */
 217 static void
 218 _swsetup_RenderFinish( GLcontext *ctx )
 219 {
 220    _swrast_render_finish( ctx );
 221 }
 222
 223 void
 224 _swsetup_InvalidateState( GLcontext *ctx, GLuint new_state )
 225 {
 226    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 227    swsetup->NewState |= new_state;
 228    _tnl_invalidate_vertex_state( ctx, new_state );
 229 }
 230
 231
 232 void
 233 _swsetup_Wakeup( GLcontext *ctx )
 234 {
 235    TNLcontext *tnl = TNL_CONTEXT(ctx);
 236    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 237
 238    tnl->Driver.Render.Start = _swsetup_RenderStart;
 239    tnl->Driver.Render.Finish = _swsetup_RenderFinish;
 240    tnl->Driver.Render.PrimitiveNotify = _swsetup_RenderPrimitive;
 241    tnl->Driver.Render.Interp = _tnl_interp;
 242    tnl->Driver.Render.CopyPV = _tnl_copy_pv;
 243    tnl->Driver.Render.ClippedPolygon = _tnl_RenderClippedPolygon; /* new */
 244    tnl->Driver.Render.ClippedLine = _tnl_RenderClippedLine; /* new */
 245    /* points */
 246    /* line */
 247    /* triangle */
 248    /* quad */
 249    tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
 250    tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
 251    tnl->Driver.Render.ResetLineStipple = _swrast_ResetLineStipple;
 252    tnl->Driver.Render.BuildVertices = _tnl_build_vertices;
 253    tnl->Driver.Render.Multipass = 0;
 254
 255    _tnl_invalidate_vertices( ctx, ~0 );
 256    _tnl_need_projected_coords( ctx, GL_TRUE );
 257    _swsetup_InvalidateState( ctx, ~0 );
 258
 259    swsetup->verts = (SWvertex *)tnl->clipspace.vertex_buf;
 260    RENDERINPUTS_ZERO( swsetup->last_index_bitset );
 261 }
 262
 263
 264 /**
 265  * Populate a swrast SWvertex from an attrib-style vertex.
 266  */
 267 void
 268 _swsetup_Translate( GLcontext *ctx, const void *vertex, SWvertex *dest )
 269 {
 270    const GLfloat *m = ctx->Viewport._WindowMap.m;
 271    GLfloat tmp[4];
 272    GLuint i;
 273
 274    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_POS, tmp );
 275
 276    dest->attrib[FRAG_ATTRIB_WPOS][0] = m[0]  * tmp[0] + m[12];
 277    dest->attrib[FRAG_ATTRIB_WPOS][1] = m[5]  * tmp[1] + m[13];
 278    dest->attrib[FRAG_ATTRIB_WPOS][2] = m[10] * tmp[2] + m[14];
 279    dest->attrib[FRAG_ATTRIB_WPOS][3] =         tmp[3];
 280
 281    /** XXX try to limit these loops someday */
 282    for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 283       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_TEX0 + i,
 284                      dest->attrib[FRAG_ATTRIB_TEX0 + i] );
 285
 286    for (i = 0 ; i < ctx->Const.MaxVarying ; i++)
 287       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_GENERIC0 + i,
 288                      dest->attrib[FRAG_ATTRIB_VAR0 + i] );
 289
 290    if (ctx->Visual.rgbMode) {
 291       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR0,
 292                      dest->attrib[FRAG_ATTRIB_COL0] );
 293       UNCLAMPED_FLOAT_TO_RGBA_CHAN( dest->color, tmp );
 294
 295       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR1,
 296                      dest->attrib[FRAG_ATTRIB_COL1]);
 297    }
 298    else {
 299       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR_INDEX, tmp );
 300       dest->attrib[FRAG_ATTRIB_CI][0] = tmp[0];
 301    }
 302
 303    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_FOG, tmp );
 304    dest->attrib[FRAG_ATTRIB_FOGC][0] = tmp[0];
 305
 306    /* XXX See _tnl_get_attr about pointsize ... */
 307    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_POINTSIZE, tmp );
 308    dest->pointSize = tmp[0];
 309 }
 310