src/mesa/tnl/t_vb_program.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2006  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
  25
  26 /**
  27  * \file tnl/t_vb_program.c
  28  * \brief Pipeline stage for executing NVIDIA vertex programs.
  29  * \author Brian Paul,  Keith Whitwell
  30  */
  31
  32
  33 #include "glheader.h"
  34 #include "api_noop.h"
  35 #include "colormac.h"
  36 #include "context.h"
  37 #include "dlist.h"
  38 #include "hash.h"
  39 #include "light.h"
  40 #include "macros.h"
  41 #include "imports.h"
  42 #include "simple_list.h"
  43 #include "mtypes.h"
  44 #include "program_instruction.h"
  45 #include "nvvertexec.h"
  46 #include "nvprogram.h"
  47
  48 #include "t_context.h"
  49 #include "t_pipeline.h"
  50
  51
  52
  53 /*!
  54  * Private storage for the vertex program pipeline stage.
  55  */
  56 struct vp_stage_data {
  57    /** The results of running the vertex program go into these arrays. */
  58    GLvector4f attribs[15];
  59
  60    GLvector4f ndcCoords;              /**< normalized device coords */
  61    GLubyte *clipmask;                 /**< clip flags */
  62    GLubyte ormask, andmask;           /**< for clipping */
  63 };
  64
  65
  66 #define VP_STAGE_DATA(stage) ((struct vp_stage_data *)(stage->privatePtr))
  67
  68
  69 /**
  70  * This function executes vertex programs
  71  */
  72 static GLboolean
  73 run_vp( GLcontext *ctx, struct tnl_pipeline_stage *stage )
  74 {
  75    TNLcontext *tnl = TNL_CONTEXT(ctx);
  76    struct vp_stage_data *store = VP_STAGE_DATA(stage);
  77    struct vertex_buffer *VB = &tnl->vb;
  78    struct gl_vertex_program *program = ctx->VertexProgram.Current;
  79    GLuint i;
  80
  81    if (ctx->ShaderObjects._VertexShaderPresent)
  82       return GL_TRUE;
  83
  84    if (!ctx->VertexProgram._Enabled ||
  85        !program->IsNVProgram)
  86       return GL_TRUE;
  87
  88    /* load program parameter registers (they're read-only) */
  89    _mesa_init_vp_per_primitive_registers(ctx);
  90
  91    for (i = 0; i < VB->Count; i++) {
  92       GLuint attr;
  93
  94       _mesa_init_vp_per_vertex_registers(ctx);
  95
  96 #if 0
  97       printf("Input  %d: %f, %f, %f, %f\n", i,
  98              VB->AttribPtr[0]->data[i][0],
  99              VB->AttribPtr[0]->data[i][1],
 100              VB->AttribPtr[0]->data[i][2],
 101              VB->AttribPtr[0]->data[i][3]);
 102       printf("   color: %f, %f, %f, %f\n",
 103              VB->AttribPtr[3]->data[i][0],
 104              VB->AttribPtr[3]->data[i][1],
 105              VB->AttribPtr[3]->data[i][2],
 106              VB->AttribPtr[3]->data[i][3]);
 107       printf("  normal: %f, %f, %f, %f\n",
 108              VB->AttribPtr[2]->data[i][0],
 109              VB->AttribPtr[2]->data[i][1],
 110              VB->AttribPtr[2]->data[i][2],
 111              VB->AttribPtr[2]->data[i][3]);
 112 #endif
 113
 114       /* the vertex array case */
 115       for (attr = 0; attr < VERT_ATTRIB_MAX; attr++) {
 116          if (program->Base.InputsRead & (1 << attr)) {
 117             const GLubyte *ptr = (const GLubyte*) VB->AttribPtr[attr]->data;
 118             const GLuint size = VB->AttribPtr[attr]->size;
 119             const GLuint stride = VB->AttribPtr[attr]->stride;
 120             const GLfloat *data = (GLfloat *) (ptr + stride * i);
 121             COPY_CLEAN_4V(ctx->VertexProgram.Machine.Inputs[attr], size, data);
 122          }
 123       }
 124
 125       /* execute the program */
 126       ASSERT(program);
 127       _mesa_exec_vertex_program(ctx, program);
 128
 129       /* Fixup fog an point size results if needed */
 130       if (ctx->Fog.Enabled &&
 131           (program->Base.OutputsWritten & (1 << VERT_RESULT_FOGC)) == 0) {
 132          ctx->VertexProgram.Machine.Outputs[VERT_RESULT_FOGC][0] = 1.0;
 133       }
 134
 135       if (ctx->VertexProgram.PointSizeEnabled &&
 136           (program->Base.OutputsWritten & (1 << VERT_RESULT_PSIZ)) == 0) {
 137          ctx->VertexProgram.Machine.Outputs[VERT_RESULT_PSIZ][0] = ctx->Point.Size;
 138       }
 139
 140       /* copy the output registers into the VB->attribs arrays */
 141       /* XXX (optimize) could use a conditional and smaller loop limit here */
 142       for (attr = 0; attr < 15; attr++) {
 143          COPY_4V(store->attribs[attr].data[i],
 144                  ctx->VertexProgram.Machine.Outputs[attr]);
 145       }
 146    }
 147
 148    /* Setup the VB pointers so that the next pipeline stages get
 149     * their data from the right place (the program output arrays).
 150     */
 151    VB->ClipPtr = &store->attribs[VERT_RESULT_HPOS];
 152    VB->ClipPtr->size = 4;
 153    VB->ClipPtr->count = VB->Count;
 154    VB->ColorPtr[0] = &store->attribs[VERT_RESULT_COL0];
 155    VB->ColorPtr[1] = &store->attribs[VERT_RESULT_BFC0];
 156    VB->SecondaryColorPtr[0] = &store->attribs[VERT_RESULT_COL1];
 157    VB->SecondaryColorPtr[1] = &store->attribs[VERT_RESULT_BFC1];
 158    VB->FogCoordPtr = &store->attribs[VERT_RESULT_FOGC];
 159
 160    VB->AttribPtr[VERT_ATTRIB_COLOR0] = &store->attribs[VERT_RESULT_COL0];
 161    VB->AttribPtr[VERT_ATTRIB_COLOR1] = &store->attribs[VERT_RESULT_COL1];
 162    VB->AttribPtr[VERT_ATTRIB_FOG] = &store->attribs[VERT_RESULT_FOGC];
 163    VB->AttribPtr[_TNL_ATTRIB_POINTSIZE] = &store->attribs[VERT_RESULT_PSIZ];
 164
 165    for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) {
 166       VB->TexCoordPtr[i] =
 167       VB->AttribPtr[_TNL_ATTRIB_TEX0 + i]
 168          = &store->attribs[VERT_RESULT_TEX0 + i];
 169    }
 170
 171    /* Cliptest and perspective divide.  Clip functions must clear
 172     * the clipmask.
 173     */
 174    store->ormask = 0;
 175    store->andmask = CLIP_FRUSTUM_BITS;
 176
 177    if (tnl->NeedNdcCoords) {
 178       VB->NdcPtr =
 179          _mesa_clip_tab[VB->ClipPtr->size]( VB->ClipPtr,
 180                                             &store->ndcCoords,
 181                                             store->clipmask,
 182                                             &store->ormask,
 183                                             &store->andmask );
 184    }
 185    else {
 186       VB->NdcPtr = NULL;
 187       _mesa_clip_np_tab[VB->ClipPtr->size]( VB->ClipPtr,
 188                                             NULL,
 189                                             store->clipmask,
 190                                             &store->ormask,
 191                                             &store->andmask );
 192    }
 193
 194    if (store->andmask)  /* All vertices are outside the frustum */
 195       return GL_FALSE;
 196
 197
 198    /* This is where we'd do clip testing against the user-defined
 199     * clipping planes, but they're not supported by vertex programs.
 200     */
 201
 202    VB->ClipOrMask = store->ormask;
 203    VB->ClipMask = store->clipmask;
 204
 205    return GL_TRUE;
 206 }
 207
 208
 209
 210
 211 /**
 212  * Called the first time stage->run is called.  In effect, don't
 213  * allocate data until the first time the stage is run.
 214  */
 215 static GLboolean init_vp( GLcontext *ctx,
 216                           struct tnl_pipeline_stage *stage )
 217 {
 218    TNLcontext *tnl = TNL_CONTEXT(ctx);
 219    struct vertex_buffer *VB = &(tnl->vb);
 220    struct vp_stage_data *store;
 221    const GLuint size = VB->Size;
 222    GLuint i;
 223
 224    stage->privatePtr = MALLOC(sizeof(*store));
 225    store = VP_STAGE_DATA(stage);
 226    if (!store)
 227       return GL_FALSE;
 228
 229    /* Allocate arrays of vertex output values */
 230    /* XXX change '15' to a named constant */
 231    for (i = 0; i < 15; i++) {
 232       _mesa_vector4f_alloc( &store->attribs[i], 0, size, 32 );
 233       store->attribs[i].size = 4;
 234    }
 235
 236    /* a few other misc allocations */
 237    _mesa_vector4f_alloc( &store->ndcCoords, 0, size, 32 );
 238    store->clipmask = (GLubyte *) ALIGN_MALLOC(sizeof(GLubyte)*size, 32 );
 239
 240    return GL_TRUE;
 241 }
 242
 243
 244
 245
 246
 247 /**
 248  * Destructor for this pipeline stage.
 249  */
 250 static void dtr( struct tnl_pipeline_stage *stage )
 251 {
 252    struct vp_stage_data *store = VP_STAGE_DATA(stage);
 253
 254    if (store) {
 255       GLuint i;
 256
 257       /* free the vertex program result arrays */
 258       for (i = 0; i < VERT_RESULT_MAX; i++)
 259          _mesa_vector4f_free( &store->attribs[i] );
 260
 261       /* free misc arrays */
 262       _mesa_vector4f_free( &store->ndcCoords );
 263       ALIGN_FREE( store->clipmask );
 264
 265       FREE( store );
 266       stage->privatePtr = NULL;
 267    }
 268 }
 269
 270 /**
 271  * Public description of this pipeline stage.
 272  */
 273 const struct tnl_pipeline_stage _tnl_vertex_program_stage =
 274 {
 275    "vertex-program",
 276    NULL,                        /* private_data */
 277    init_vp,                     /* create */
 278    dtr,                         /* destroy */
 279    NULL,                        /* validate */
 280    run_vp                       /* run -- initially set to ctr */
 281 };