t_vb_program.c revision a328e469d328f8b6fd5afdfc21d576fa1a2c43fc 
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 "program.h"
43#include "simple_list.h"
44#include "mtypes.h"
45#include "program_instruction.h"
46#include "nvvertexec.h"
47#include "nvprogram.h"
48
49#include "t_context.h"
50#include "t_pipeline.h"
51
52
53
54/*!
55 * Private storage for the vertex program pipeline stage.
56 */
57struct vp_stage_data {
58   /** The results of running the vertex program go into these arrays. */
59   GLvector4f attribs[VERT_RESULT_MAX];
60
61   GLvector4f ndcCoords;              /**< normalized device coords */
62   GLubyte *clipmask;                 /**< clip flags */
63   GLubyte ormask, andmask;           /**< for clipping */
64};
65
66
67#define VP_STAGE_DATA(stage) ((struct vp_stage_data *)(stage->privatePtr))
68
69
70/**
71 * This function executes vertex programs
72 */
73static GLboolean
74run_vp( GLcontext *ctx, struct tnl_pipeline_stage *stage )
75{
76   TNLcontext *tnl = TNL_CONTEXT(ctx);
77   struct vp_stage_data *store = VP_STAGE_DATA(stage);
78   struct vertex_buffer *VB = &tnl->vb;
79   struct gl_vertex_program *program = ctx->VertexProgram._Current;
80   struct vp_machine machine;
81   GLuint i;
82
83   if (!program || !program->IsNVProgram)
84      return GL_TRUE;
85
86   _mesa_load_state_parameters(ctx, program->Base.Parameters);
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, &machine);
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(machine.Inputs[attr], size, data);
122	 }
123      }
124
125      /* execute the program */
126      ASSERT(program);
127      _mesa_exec_vertex_program(ctx, &machine, 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         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         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 < VERT_RESULT_MAX; attr++) {
143         COPY_4V(store->attribs[attr].data[i], machine.Outputs[attr]);
144      }
145#if 0
146      printf("HPOS: %f %f %f %f\n",
147             machine.Outputs[0][0],
148             machine.Outputs[0][1],
149             machine.Outputs[0][2],
150             machine.Outputs[0][3]);
151#endif
152   }
153
154   /* Setup the VB pointers so that the next pipeline stages get
155    * their data from the right place (the program output arrays).
156    */
157   VB->ClipPtr = &store->attribs[VERT_RESULT_HPOS];
158   VB->ClipPtr->size = 4;
159   VB->ClipPtr->count = VB->Count;
160   VB->ColorPtr[0] = &store->attribs[VERT_RESULT_COL0];
161   VB->ColorPtr[1] = &store->attribs[VERT_RESULT_BFC0];
162   VB->SecondaryColorPtr[0] = &store->attribs[VERT_RESULT_COL1];
163   VB->SecondaryColorPtr[1] = &store->attribs[VERT_RESULT_BFC1];
164   VB->FogCoordPtr = &store->attribs[VERT_RESULT_FOGC];
165
166   VB->AttribPtr[VERT_ATTRIB_COLOR0] = &store->attribs[VERT_RESULT_COL0];
167   VB->AttribPtr[VERT_ATTRIB_COLOR1] = &store->attribs[VERT_RESULT_COL1];
168   VB->AttribPtr[VERT_ATTRIB_FOG] = &store->attribs[VERT_RESULT_FOGC];
169   VB->AttribPtr[_TNL_ATTRIB_POINTSIZE] = &store->attribs[VERT_RESULT_PSIZ];
170
171   for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) {
172      VB->TexCoordPtr[i] =
173      VB->AttribPtr[_TNL_ATTRIB_TEX0 + i]
174         = &store->attribs[VERT_RESULT_TEX0 + i];
175   }
176
177   /* Cliptest and perspective divide.  Clip functions must clear
178    * the clipmask.
179    */
180   store->ormask = 0;
181   store->andmask = CLIP_FRUSTUM_BITS;
182
183   if (tnl->NeedNdcCoords) {
184      VB->NdcPtr =
185         _mesa_clip_tab[VB->ClipPtr->size]( VB->ClipPtr,
186                                            &store->ndcCoords,
187                                            store->clipmask,
188                                            &store->ormask,
189                                            &store->andmask );
190   }
191   else {
192      VB->NdcPtr = NULL;
193      _mesa_clip_np_tab[VB->ClipPtr->size]( VB->ClipPtr,
194                                            NULL,
195                                            store->clipmask,
196                                            &store->ormask,
197                                            &store->andmask );
198   }
199
200   if (store->andmask)  /* All vertices are outside the frustum */
201      return GL_FALSE;
202
203
204   /* This is where we'd do clip testing against the user-defined
205    * clipping planes, but they're not supported by vertex programs.
206    */
207
208   VB->ClipOrMask = store->ormask;
209   VB->ClipMask = store->clipmask;
210
211   return GL_TRUE;
212}
213
214
215
216
217/**
218 * Called the first time stage->run is called.  In effect, don't
219 * allocate data until the first time the stage is run.
220 */
221static GLboolean init_vp( GLcontext *ctx,
222			  struct tnl_pipeline_stage *stage )
223{
224   TNLcontext *tnl = TNL_CONTEXT(ctx);
225   struct vertex_buffer *VB = &(tnl->vb);
226   struct vp_stage_data *store;
227   const GLuint size = VB->Size;
228   GLuint i;
229
230   stage->privatePtr = MALLOC(sizeof(*store));
231   store = VP_STAGE_DATA(stage);
232   if (!store)
233      return GL_FALSE;
234
235   /* Allocate arrays of vertex output values */
236   for (i = 0; i < VERT_RESULT_MAX; i++) {
237      _mesa_vector4f_alloc( &store->attribs[i], 0, size, 32 );
238      store->attribs[i].size = 4;
239   }
240
241   /* a few other misc allocations */
242   _mesa_vector4f_alloc( &store->ndcCoords, 0, size, 32 );
243   store->clipmask = (GLubyte *) ALIGN_MALLOC(sizeof(GLubyte)*size, 32 );
244
245   return GL_TRUE;
246}
247
248
249
250
251
252/**
253 * Destructor for this pipeline stage.
254 */
255static void dtr( struct tnl_pipeline_stage *stage )
256{
257   struct vp_stage_data *store = VP_STAGE_DATA(stage);
258
259   if (store) {
260      GLuint i;
261
262      /* free the vertex program result arrays */
263      for (i = 0; i < VERT_RESULT_MAX; i++)
264         _mesa_vector4f_free( &store->attribs[i] );
265
266      /* free misc arrays */
267      _mesa_vector4f_free( &store->ndcCoords );
268      ALIGN_FREE( store->clipmask );
269
270      FREE( store );
271      stage->privatePtr = NULL;
272   }
273}
274
275/**
276 * Public description of this pipeline stage.
277 */
278const struct tnl_pipeline_stage _tnl_vertex_program_stage =
279{
280   "vertex-program",
281   NULL,			/* private_data */
282   init_vp,			/* create */
283   dtr,				/* destroy */
284   NULL, 			/* validate */
285   run_vp			/* run -- initially set to ctr */
286};
287