t_vb_program.c revision 7e807510d8c3e88ee7ae6c697393201cf08f992f 
1/*
2 * Mesa 3-D graphics library
3 * Version:  6.1
4 *
5 * Copyright (C) 1999-2004  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->VertexProgram._Enabled ||
84       !program->IsNVProgram)
85      return GL_TRUE;
86
87   /* load program parameter registers (they're read-only) */
88   _mesa_init_vp_per_primitive_registers(ctx);
89
90   for (i = 0; i < VB->Count; i++) {
91      GLuint attr;
92
93      _mesa_init_vp_per_vertex_registers(ctx);
94
95#if 0
96      printf("Input  %d: %f, %f, %f, %f\n", i,
97             VB->AttribPtr[0]->data[i][0],
98             VB->AttribPtr[0]->data[i][1],
99             VB->AttribPtr[0]->data[i][2],
100             VB->AttribPtr[0]->data[i][3]);
101      printf("   color: %f, %f, %f, %f\n",
102             VB->AttribPtr[3]->data[i][0],
103             VB->AttribPtr[3]->data[i][1],
104             VB->AttribPtr[3]->data[i][2],
105             VB->AttribPtr[3]->data[i][3]);
106      printf("  normal: %f, %f, %f, %f\n",
107             VB->AttribPtr[2]->data[i][0],
108             VB->AttribPtr[2]->data[i][1],
109             VB->AttribPtr[2]->data[i][2],
110             VB->AttribPtr[2]->data[i][3]);
111#endif
112
113      /* the vertex array case */
114      for (attr = 0; attr < VERT_ATTRIB_MAX; attr++) {
115	 if (program->InputsRead & (1 << attr)) {
116	    const GLubyte *ptr = (const GLubyte*) VB->AttribPtr[attr]->data;
117	    const GLuint size = VB->AttribPtr[attr]->size;
118	    const GLuint stride = VB->AttribPtr[attr]->stride;
119	    const GLfloat *data = (GLfloat *) (ptr + stride * i);
120	    COPY_CLEAN_4V(ctx->VertexProgram.Inputs[attr], size, data);
121	 }
122      }
123
124      /* execute the program */
125      ASSERT(program);
126      _mesa_exec_vertex_program(ctx, program);
127
128      /* Fixup fog an point size results if needed */
129      if (ctx->Fog.Enabled &&
130          (program->OutputsWritten & (1 << VERT_RESULT_FOGC)) == 0) {
131         ctx->VertexProgram.Outputs[VERT_RESULT_FOGC][0] = 1.0;
132      }
133
134      if (ctx->VertexProgram.PointSizeEnabled &&
135          (program->OutputsWritten & (1 << VERT_RESULT_PSIZ)) == 0) {
136         ctx->VertexProgram.Outputs[VERT_RESULT_PSIZ][0] = ctx->Point.Size;
137      }
138
139      /* copy the output registers into the VB->attribs arrays */
140      /* XXX (optimize) could use a conditional and smaller loop limit here */
141      for (attr = 0; attr < 15; attr++) {
142         COPY_4V(store->attribs[attr].data[i],
143                 ctx->VertexProgram.Outputs[attr]);
144      }
145   }
146
147   /* Setup the VB pointers so that the next pipeline stages get
148    * their data from the right place (the program output arrays).
149    */
150   VB->ClipPtr = &store->attribs[VERT_RESULT_HPOS];
151   VB->ClipPtr->size = 4;
152   VB->ClipPtr->count = VB->Count;
153   VB->ColorPtr[0] = &store->attribs[VERT_RESULT_COL0];
154   VB->ColorPtr[1] = &store->attribs[VERT_RESULT_BFC0];
155   VB->SecondaryColorPtr[0] = &store->attribs[VERT_RESULT_COL1];
156   VB->SecondaryColorPtr[1] = &store->attribs[VERT_RESULT_BFC1];
157   VB->FogCoordPtr = &store->attribs[VERT_RESULT_FOGC];
158   VB->PointSizePtr = &store->attribs[VERT_RESULT_PSIZ];
159
160   VB->AttribPtr[VERT_ATTRIB_COLOR0] = VB->ColorPtr[0];
161   VB->AttribPtr[VERT_ATTRIB_COLOR1] = VB->SecondaryColorPtr[0];
162   VB->AttribPtr[VERT_ATTRIB_FOG] = VB->FogCoordPtr;
163   VB->AttribPtr[_TNL_ATTRIB_POINTSIZE] = &store->attribs[VERT_RESULT_PSIZ];
164
165   for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
166      VB->AttribPtr[VERT_ATTRIB_TEX0+i] = VB->TexCoordPtr[i] =
167	 &store->attribs[VERT_RESULT_TEX0 + i];
168   }
169
170
171
172   /* Cliptest and perspective divide.  Clip functions must clear
173    * the clipmask.
174    */
175   store->ormask = 0;
176   store->andmask = CLIP_ALL_BITS;
177
178   if (tnl->NeedNdcCoords) {
179      VB->NdcPtr =
180         _mesa_clip_tab[VB->ClipPtr->size]( VB->ClipPtr,
181                                            &store->ndcCoords,
182                                            store->clipmask,
183                                            &store->ormask,
184                                            &store->andmask );
185   }
186   else {
187      VB->NdcPtr = NULL;
188      _mesa_clip_np_tab[VB->ClipPtr->size]( VB->ClipPtr,
189                                            NULL,
190                                            store->clipmask,
191                                            &store->ormask,
192                                            &store->andmask );
193   }
194
195   if (store->andmask)  /* All vertices are outside the frustum */
196      return GL_FALSE;
197
198
199   /* This is where we'd do clip testing against the user-defined
200    * clipping planes, but they're not supported by vertex programs.
201    */
202
203   VB->ClipOrMask = store->ormask;
204   VB->ClipMask = store->clipmask;
205
206   return GL_TRUE;
207}
208
209
210
211
212/**
213 * Called the first time stage->run is called.  In effect, don't
214 * allocate data until the first time the stage is run.
215 */
216static GLboolean init_vp( GLcontext *ctx,
217			  struct tnl_pipeline_stage *stage )
218{
219   TNLcontext *tnl = TNL_CONTEXT(ctx);
220   struct vertex_buffer *VB = &(tnl->vb);
221   struct vp_stage_data *store;
222   const GLuint size = VB->Size;
223   GLuint i;
224
225   stage->privatePtr = MALLOC(sizeof(*store));
226   store = VP_STAGE_DATA(stage);
227   if (!store)
228      return GL_FALSE;
229
230   /* Allocate arrays of vertex output values */
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 */
250static 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 */
273const 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};
282