t_vb_program.c revision 071357096e682e9af59ad45ea5abc444ab431837 
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 "math/m_translate.h"
49
50#include "t_context.h"
51#include "t_pipeline.h"
52
53
54
55/*!
56 * Private storage for the vertex program pipeline stage.
57 */
58struct vp_stage_data {
59   /** The results of running the vertex program go into these arrays. */
60   GLvector4f attribs[15];
61
62   GLvector4f ndcCoords;              /**< normalized device coords */
63   GLubyte *clipmask;                 /**< clip flags */
64   GLubyte ormask, andmask;           /**< for clipping */
65};
66
67
68#define VP_STAGE_DATA(stage) ((struct vp_stage_data *)(stage->privatePtr))
69
70
71/**
72 * This function executes vertex programs
73 */
74static GLboolean
75run_vp( GLcontext *ctx, struct tnl_pipeline_stage *stage )
76{
77   TNLcontext *tnl = TNL_CONTEXT(ctx);
78   struct vp_stage_data *store = VP_STAGE_DATA(stage);
79   struct vertex_buffer *VB = &tnl->vb;
80   struct vertex_program *program = ctx->VertexProgram.Current;
81   GLuint i;
82
83   if (ctx->ShaderObjects._VertexShaderPresent)
84      return GL_TRUE;
85
86   if (!ctx->VertexProgram._Enabled ||
87       !program->IsNVProgram)
88      return GL_TRUE;
89
90   /* load program parameter registers (they're read-only) */
91   _mesa_init_vp_per_primitive_registers(ctx);
92
93   for (i = 0; i < VB->Count; i++) {
94      GLuint attr;
95
96      _mesa_init_vp_per_vertex_registers(ctx);
97
98#if 0
99      printf("Input  %d: %f, %f, %f, %f\n", i,
100             VB->AttribPtr[0]->data[i][0],
101             VB->AttribPtr[0]->data[i][1],
102             VB->AttribPtr[0]->data[i][2],
103             VB->AttribPtr[0]->data[i][3]);
104      printf("   color: %f, %f, %f, %f\n",
105             VB->AttribPtr[3]->data[i][0],
106             VB->AttribPtr[3]->data[i][1],
107             VB->AttribPtr[3]->data[i][2],
108             VB->AttribPtr[3]->data[i][3]);
109      printf("  normal: %f, %f, %f, %f\n",
110             VB->AttribPtr[2]->data[i][0],
111             VB->AttribPtr[2]->data[i][1],
112             VB->AttribPtr[2]->data[i][2],
113             VB->AttribPtr[2]->data[i][3]);
114#endif
115
116      /* the vertex array case */
117      for (attr = 0; attr < VERT_ATTRIB_MAX; attr++) {
118	 if (program->Base.InputsRead & (1 << attr)) {
119	    const GLubyte *ptr = (const GLubyte*) VB->AttribPtr[attr]->data;
120	    const GLuint size = VB->AttribPtr[attr]->size;
121	    const GLuint stride = VB->AttribPtr[attr]->stride;
122	    const GLfloat *data = (GLfloat *) (ptr + stride * i);
123	    COPY_CLEAN_4V(ctx->VertexProgram.Inputs[attr], size, data);
124	 }
125      }
126
127      /* execute the program */
128      ASSERT(program);
129      _mesa_exec_vertex_program(ctx, program);
130
131      /* Fixup fog an point size results if needed */
132      if (ctx->Fog.Enabled &&
133          (program->Base.OutputsWritten & (1 << VERT_RESULT_FOGC)) == 0) {
134         ctx->VertexProgram.Outputs[VERT_RESULT_FOGC][0] = 1.0;
135      }
136
137      if (ctx->VertexProgram.PointSizeEnabled &&
138          (program->Base.OutputsWritten & (1 << VERT_RESULT_PSIZ)) == 0) {
139         ctx->VertexProgram.Outputs[VERT_RESULT_PSIZ][0] = ctx->Point.Size;
140      }
141
142      /* copy the output registers into the VB->attribs arrays */
143      /* XXX (optimize) could use a conditional and smaller loop limit here */
144      for (attr = 0; attr < 15; attr++) {
145         COPY_4V(store->attribs[attr].data[i],
146                 ctx->VertexProgram.Outputs[attr]);
147      }
148   }
149
150   /* Setup the VB pointers so that the next pipeline stages get
151    * their data from the right place (the program output arrays).
152    */
153   VB->ClipPtr = &store->attribs[VERT_RESULT_HPOS];
154   VB->ClipPtr->size = 4;
155   VB->ClipPtr->count = VB->Count;
156   VB->ColorPtr[0] = &store->attribs[VERT_RESULT_COL0];
157   VB->ColorPtr[1] = &store->attribs[VERT_RESULT_BFC0];
158   VB->SecondaryColorPtr[0] = &store->attribs[VERT_RESULT_COL1];
159   VB->SecondaryColorPtr[1] = &store->attribs[VERT_RESULT_BFC1];
160   VB->FogCoordPtr = &store->attribs[VERT_RESULT_FOGC];
161   VB->PointSizePtr = &store->attribs[VERT_RESULT_PSIZ];
162
163   VB->AttribPtr[VERT_ATTRIB_COLOR0] = VB->ColorPtr[0];
164   VB->AttribPtr[VERT_ATTRIB_COLOR1] = VB->SecondaryColorPtr[0];
165   VB->AttribPtr[VERT_ATTRIB_FOG] = VB->FogCoordPtr;
166   VB->AttribPtr[_TNL_ATTRIB_POINTSIZE] = &store->attribs[VERT_RESULT_PSIZ];
167
168   for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
169      VB->AttribPtr[VERT_ATTRIB_TEX0+i] = VB->TexCoordPtr[i] =
170	 &store->attribs[VERT_RESULT_TEX0 + i];
171   }
172
173
174
175   /* Cliptest and perspective divide.  Clip functions must clear
176    * the clipmask.
177    */
178   store->ormask = 0;
179   store->andmask = CLIP_ALL_BITS;
180
181   if (tnl->NeedNdcCoords) {
182      VB->NdcPtr =
183         _mesa_clip_tab[VB->ClipPtr->size]( VB->ClipPtr,
184                                            &store->ndcCoords,
185                                            store->clipmask,
186                                            &store->ormask,
187                                            &store->andmask );
188   }
189   else {
190      VB->NdcPtr = NULL;
191      _mesa_clip_np_tab[VB->ClipPtr->size]( VB->ClipPtr,
192                                            NULL,
193                                            store->clipmask,
194                                            &store->ormask,
195                                            &store->andmask );
196   }
197
198   if (store->andmask)  /* All vertices are outside the frustum */
199      return GL_FALSE;
200
201
202   /* This is where we'd do clip testing against the user-defined
203    * clipping planes, but they're not supported by vertex programs.
204    */
205
206   VB->ClipOrMask = store->ormask;
207   VB->ClipMask = store->clipmask;
208
209   return GL_TRUE;
210}
211
212
213
214
215/**
216 * Called the first time stage->run is called.  In effect, don't
217 * allocate data until the first time the stage is run.
218 */
219static GLboolean init_vp( GLcontext *ctx,
220			  struct tnl_pipeline_stage *stage )
221{
222   TNLcontext *tnl = TNL_CONTEXT(ctx);
223   struct vertex_buffer *VB = &(tnl->vb);
224   struct vp_stage_data *store;
225   const GLuint size = VB->Size;
226   GLuint i;
227
228   stage->privatePtr = MALLOC(sizeof(*store));
229   store = VP_STAGE_DATA(stage);
230   if (!store)
231      return GL_FALSE;
232
233   /* Allocate arrays of vertex output values */
234   for (i = 0; i < 15; i++) {
235      _mesa_vector4f_alloc( &store->attribs[i], 0, size, 32 );
236      store->attribs[i].size = 4;
237   }
238
239   /* a few other misc allocations */
240   _mesa_vector4f_alloc( &store->ndcCoords, 0, size, 32 );
241   store->clipmask = (GLubyte *) ALIGN_MALLOC(sizeof(GLubyte)*size, 32 );
242
243   return GL_TRUE;
244}
245
246
247
248
249
250/**
251 * Destructor for this pipeline stage.
252 */
253static void dtr( struct tnl_pipeline_stage *stage )
254{
255   struct vp_stage_data *store = VP_STAGE_DATA(stage);
256
257   if (store) {
258      GLuint i;
259
260      /* free the vertex program result arrays */
261      for (i = 0; i < VERT_RESULT_MAX; i++)
262         _mesa_vector4f_free( &store->attribs[i] );
263
264      /* free misc arrays */
265      _mesa_vector4f_free( &store->ndcCoords );
266      ALIGN_FREE( store->clipmask );
267
268      FREE( store );
269      stage->privatePtr = NULL;
270   }
271}
272
273/**
274 * Public description of this pipeline stage.
275 */
276const struct tnl_pipeline_stage _tnl_vertex_program_stage =
277{
278   "vertex-program",
279   NULL,			/* private_data */
280   init_vp,			/* create */
281   dtr,				/* destroy */
282   NULL, 			/* validate */
283   run_vp			/* run -- initially set to ctr */
284};
285