src/mesa/swrast_setup/ss_context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.3
   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          if (ctx->FragmentProgram._Current
 127              || ctx->ATIFragmentShader._Enabled
 128              || CHAN_TYPE == GL_FLOAT)
 129             EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4F, attrib[FRAG_ATTRIB_COL0]);
 130          else
 131             EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4CHAN_4F_RGBA, color );
 132       }
 133
 134       if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR1 )) {
 135          EMIT_ATTR( _TNL_ATTRIB_COLOR1, EMIT_4F, attrib[FRAG_ATTRIB_COL1]);
 136       }
 137
 138       if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR_INDEX )) {
 139          EMIT_ATTR( _TNL_ATTRIB_COLOR_INDEX, EMIT_1F,
 140                     attrib[FRAG_ATTRIB_CI][0] );
 141       }
 142
 143       if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_FOG )) {
 144          const GLint emit = ctx->FragmentProgram._Current ? EMIT_4F : EMIT_1F;
 145          EMIT_ATTR( _TNL_ATTRIB_FOG, emit, attrib[FRAG_ATTRIB_FOGC]);
 146       }
 147
 148       if (RENDERINPUTS_TEST_RANGE(index_bitset, _TNL_FIRST_TEX, _TNL_LAST_TEX))
 149       {
 150          for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
 151             if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_TEX(i) )) {
 152                EMIT_ATTR( _TNL_ATTRIB_TEX(i), EMIT_4F,
 153                           attrib[FRAG_ATTRIB_TEX0 + i] );
 154             }
 155          }
 156       }
 157
 158       /* shader varying vars */
 159       if (RENDERINPUTS_TEST_RANGE( index_bitset,
 160                                    _TNL_FIRST_GENERIC, _TNL_LAST_GENERIC )) {
 161          for (i = 0; i < ctx->Const.MaxVarying; i++) {
 162             if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_GENERIC(i) )) {
 163                EMIT_ATTR( _TNL_ATTRIB_GENERIC(i), VARYING_EMIT_STYLE,
 164                           attrib[FRAG_ATTRIB_VAR0 + i] );
 165             }
 166          }
 167       }
 168
 169       if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_POINTSIZE ))
 170          EMIT_ATTR( _TNL_ATTRIB_POINTSIZE, EMIT_1F, pointSize );
 171
 172       _tnl_install_attrs( ctx, map, e,
 173                           ctx->Viewport._WindowMap.m,
 174                           sizeof(SWvertex) );
 175
 176       RENDERINPUTS_COPY( swsetup->last_index_bitset, index_bitset );
 177    }
 178 }
 179
 180
 181 /**
 182  * Prepare to render a vertex buffer.
 183  * Called via tnl->Driver.Render.Start.
 184  */
 185 static void
 186 _swsetup_RenderStart( GLcontext *ctx )
 187 {
 188    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 189    TNLcontext *tnl = TNL_CONTEXT(ctx);
 190    struct vertex_buffer *VB = &tnl->vb;
 191
 192    if (swsetup->NewState & _SWSETUP_NEW_RENDERINDEX) {
 193       _swsetup_choose_trifuncs(ctx);
 194    }
 195
 196    if (swsetup->NewState & _NEW_PROGRAM) {
 197       RENDERINPUTS_ZERO( swsetup->last_index_bitset );
 198    }
 199
 200    swsetup->NewState = 0;
 201
 202    _swrast_render_start(ctx);
 203
 204    /* Important */
 205    VB->AttribPtr[VERT_ATTRIB_POS] = VB->NdcPtr;
 206
 207    setup_vertex_format(ctx);
 208 }
 209
 210
 211 /*
 212  * We patch this function into tnl->Driver.Render.Finish.
 213  * It's called when we finish rendering a vertex buffer.
 214  */
 215 static void
 216 _swsetup_RenderFinish( GLcontext *ctx )
 217 {
 218    _swrast_render_finish( ctx );
 219 }
 220
 221 void
 222 _swsetup_InvalidateState( GLcontext *ctx, GLuint new_state )
 223 {
 224    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 225    swsetup->NewState |= new_state;
 226    _tnl_invalidate_vertex_state( ctx, new_state );
 227 }
 228
 229
 230 void
 231 _swsetup_Wakeup( GLcontext *ctx )
 232 {
 233    TNLcontext *tnl = TNL_CONTEXT(ctx);
 234    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 235
 236    tnl->Driver.Render.Start = _swsetup_RenderStart;
 237    tnl->Driver.Render.Finish = _swsetup_RenderFinish;
 238    tnl->Driver.Render.PrimitiveNotify = _swsetup_RenderPrimitive;
 239    tnl->Driver.Render.Interp = _tnl_interp;
 240    tnl->Driver.Render.CopyPV = _tnl_copy_pv;
 241    tnl->Driver.Render.ClippedPolygon = _tnl_RenderClippedPolygon; /* new */
 242    tnl->Driver.Render.ClippedLine = _tnl_RenderClippedLine; /* new */
 243    /* points */
 244    /* line */
 245    /* triangle */
 246    /* quad */
 247    tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
 248    tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
 249    tnl->Driver.Render.ResetLineStipple = _swrast_ResetLineStipple;
 250    tnl->Driver.Render.BuildVertices = _tnl_build_vertices;
 251    tnl->Driver.Render.Multipass = 0;
 252
 253    _tnl_invalidate_vertices( ctx, ~0 );
 254    _tnl_need_projected_coords( ctx, GL_TRUE );
 255    _swsetup_InvalidateState( ctx, ~0 );
 256
 257    swsetup->verts = (SWvertex *)tnl->clipspace.vertex_buf;
 258    RENDERINPUTS_ZERO( swsetup->last_index_bitset );
 259 }
 260
 261
 262 /**
 263  * Populate a swrast SWvertex from an attrib-style vertex.
 264  */
 265 void
 266 _swsetup_Translate( GLcontext *ctx, const void *vertex, SWvertex *dest )
 267 {
 268    const GLfloat *m = ctx->Viewport._WindowMap.m;
 269    GLfloat tmp[4];
 270    GLuint i;
 271
 272    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_POS, tmp );
 273
 274    dest->attrib[FRAG_ATTRIB_WPOS][0] = m[0]  * tmp[0] + m[12];
 275    dest->attrib[FRAG_ATTRIB_WPOS][1] = m[5]  * tmp[1] + m[13];
 276    dest->attrib[FRAG_ATTRIB_WPOS][2] = m[10] * tmp[2] + m[14];
 277    dest->attrib[FRAG_ATTRIB_WPOS][3] =         tmp[3];
 278
 279    /** XXX try to limit these loops someday */
 280    for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 281       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_TEX0+i,
 282                      dest->attrib[FRAG_ATTRIB_TEX0 + i] );
 283
 284    for (i = 0 ; i < ctx->Const.MaxVarying ; i++)
 285       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_GENERIC0+i,
 286                      dest->attrib[FRAG_ATTRIB_VAR0 + i] );
 287
 288    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR0, tmp );
 289    UNCLAMPED_FLOAT_TO_RGBA_CHAN( dest->color, tmp );
 290
 291    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR1, tmp );
 292    COPY_4V(dest->attrib[FRAG_ATTRIB_COL1], tmp);
 293    /*
 294    UNCLAMPED_FLOAT_TO_RGBA_CHAN( dest->specular, tmp );
 295    */
 296
 297    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_FOG, tmp );
 298    dest->attrib[FRAG_ATTRIB_FOGC][0] = tmp[0];
 299
 300    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR_INDEX, tmp );
 301    dest->attrib[FRAG_ATTRIB_CI][0] = tmp[0];
 302
 303    /* XXX See _tnl_get_attr about pointsize ... */
 304    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_POINTSIZE, tmp );
 305    dest->pointSize = tmp[0];
 306 }
 307