st_draw_feedback.c revision 5e5d0ad08167c178fcda005862e3dbead3e8c482 
1/**************************************************************************
2 *
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28#include "main/imports.h"
29#include "main/image.h"
30#include "main/macros.h"
31#include "shader/prog_uniform.h"
32
33#include "vbo/vbo.h"
34
35#include "st_context.h"
36#include "st_atom.h"
37#include "st_cb_bufferobjects.h"
38#include "st_draw.h"
39#include "st_program.h"
40
41#include "pipe/p_context.h"
42#include "pipe/p_defines.h"
43#include "pipe/p_inlines.h"
44
45#include "draw/draw_private.h"
46#include "draw/draw_context.h"
47
48
49#if FEATURE_feedback || FEATURE_drawpix
50
51/**
52 * Set the (private) draw module's post-transformed vertex format when in
53 * GL_SELECT or GL_FEEDBACK mode or for glRasterPos.
54 */
55static void
56set_feedback_vertex_format(GLcontext *ctx)
57{
58#if 0
59   struct st_context *st = ctx->st;
60   struct vertex_info vinfo;
61   GLuint i;
62
63   memset(&vinfo, 0, sizeof(vinfo));
64
65   if (ctx->RenderMode == GL_SELECT) {
66      assert(ctx->RenderMode == GL_SELECT);
67      vinfo.num_attribs = 1;
68      vinfo.format[0] = FORMAT_4F;
69      vinfo.interp_mode[0] = INTERP_LINEAR;
70   }
71   else {
72      /* GL_FEEDBACK, or glRasterPos */
73      /* emit all attribs (pos, color, texcoord) as GLfloat[4] */
74      vinfo.num_attribs = st->state.vs->cso->state.num_outputs;
75      for (i = 0; i < vinfo.num_attribs; i++) {
76         vinfo.format[i] = FORMAT_4F;
77         vinfo.interp_mode[i] = INTERP_LINEAR;
78      }
79   }
80
81   draw_set_vertex_info(st->draw, &vinfo);
82#endif
83}
84
85
86/**
87 * Called by VBO to draw arrays when in selection or feedback mode and
88 * to implement glRasterPos.
89 * This is very much like the normal draw_vbo() function above.
90 * Look at code refactoring some day.
91 * Might move this into the failover module some day.
92 */
93void
94st_feedback_draw_vbo(GLcontext *ctx,
95                     const struct gl_client_array **arrays,
96                     const struct _mesa_prim *prims,
97                     GLuint nr_prims,
98                     const struct _mesa_index_buffer *ib,
99		     GLboolean index_bounds_valid,
100                     GLuint min_index,
101                     GLuint max_index)
102{
103   struct st_context *st = ctx->st;
104   struct pipe_context *pipe = st->pipe;
105   struct draw_context *draw = st->draw;
106   const struct st_vertex_program *vp;
107   const struct pipe_shader_state *vs;
108   struct pipe_buffer *index_buffer_handle = 0;
109   struct pipe_vertex_buffer vbuffers[PIPE_MAX_SHADER_INPUTS];
110   struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
111   GLuint attr, i;
112   ubyte *mapped_constants;
113
114   assert(draw);
115
116   st_validate_state(ctx->st);
117
118   if (!index_bounds_valid)
119      vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
120
121   /* must get these after state validation! */
122   vp = ctx->st->vp;
123   vs = &st->vp_varient->state;
124
125   if (!st->vp_varient->draw_shader) {
126      st->vp_varient->draw_shader = draw_create_vertex_shader(draw, vs);
127   }
128
129   /*
130    * Set up the draw module's state.
131    *
132    * We'd like to do this less frequently, but the normal state-update
133    * code sends state updates to the pipe, not to our private draw module.
134    */
135   assert(draw);
136   draw_set_viewport_state(draw, &st->state.viewport);
137   draw_set_clip_state(draw, &st->state.clip);
138   draw_set_rasterizer_state(draw, &st->state.rasterizer);
139   draw_bind_vertex_shader(draw, st->vp_varient->draw_shader);
140   set_feedback_vertex_format(ctx);
141
142   /* loop over TGSI shader inputs to determine vertex buffer
143    * and attribute info
144    */
145   for (attr = 0; attr < vp->num_inputs; attr++) {
146      const GLuint mesaAttr = vp->index_to_input[attr];
147      struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
148      void *map;
149
150      if (bufobj && bufobj->Name) {
151         /* Attribute data is in a VBO.
152          * Recall that for VBOs, the gl_client_array->Ptr field is
153          * really an offset from the start of the VBO, not a pointer.
154          */
155         struct st_buffer_object *stobj = st_buffer_object(bufobj);
156         assert(stobj->buffer);
157
158         vbuffers[attr].buffer = NULL;
159         pipe_buffer_reference(&vbuffers[attr].buffer, stobj->buffer);
160         vbuffers[attr].buffer_offset = pointer_to_offset(arrays[0]->Ptr);
161         velements[attr].src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
162      }
163      else {
164         /* attribute data is in user-space memory, not a VBO */
165         uint bytes = (arrays[mesaAttr]->Size
166                       * _mesa_sizeof_type(arrays[mesaAttr]->Type)
167                       * (max_index + 1));
168
169         /* wrap user data */
170         vbuffers[attr].buffer
171            = pipe_user_buffer_create(pipe->screen, (void *) arrays[mesaAttr]->Ptr,
172                                      bytes);
173         vbuffers[attr].buffer_offset = 0;
174         velements[attr].src_offset = 0;
175      }
176
177      /* common-case setup */
178      vbuffers[attr].stride = arrays[mesaAttr]->StrideB; /* in bytes */
179      vbuffers[attr].max_index = max_index;
180      velements[attr].instance_divisor = 0;
181      velements[attr].vertex_buffer_index = attr;
182      velements[attr].nr_components = arrays[mesaAttr]->Size;
183      velements[attr].src_format =
184         st_pipe_vertex_format(arrays[mesaAttr]->Type,
185                               arrays[mesaAttr]->Size,
186                               arrays[mesaAttr]->Format,
187                               arrays[mesaAttr]->Normalized);
188      assert(velements[attr].src_format);
189
190      /* tell draw about this attribute */
191#if 0
192      draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);
193#endif
194
195      /* map the attrib buffer */
196      map = pipe_buffer_map(pipe->screen, vbuffers[attr].buffer,
197                            PIPE_BUFFER_USAGE_CPU_READ);
198      draw_set_mapped_vertex_buffer(draw, attr, map);
199   }
200
201   draw_set_vertex_buffers(draw, vp->num_inputs, vbuffers);
202   draw_set_vertex_elements(draw, vp->num_inputs, velements);
203
204   if (ib) {
205      struct gl_buffer_object *bufobj = ib->obj;
206      unsigned indexSize;
207      void *map;
208
209      switch (ib->type) {
210      case GL_UNSIGNED_INT:
211         indexSize = 4;
212         break;
213      case GL_UNSIGNED_SHORT:
214         indexSize = 2;
215         break;
216      default:
217         assert(0);
218	 return;
219      }
220
221      if (bufobj && bufobj->Name) {
222         struct st_buffer_object *stobj = st_buffer_object(bufobj);
223
224         index_buffer_handle = stobj->buffer;
225
226         map = pipe_buffer_map(pipe->screen, index_buffer_handle,
227                               PIPE_BUFFER_USAGE_CPU_READ);
228
229         draw_set_mapped_element_buffer(draw, indexSize, map);
230      }
231      else {
232         draw_set_mapped_element_buffer(draw, indexSize, (void *) ib->ptr);
233      }
234   }
235   else {
236      /* no index/element buffer */
237      draw_set_mapped_element_buffer(draw, 0, NULL);
238   }
239
240
241   /* map constant buffers */
242   mapped_constants = pipe_buffer_map(pipe->screen,
243                                      st->state.constants[PIPE_SHADER_VERTEX],
244                                      PIPE_BUFFER_USAGE_CPU_READ);
245   draw_set_mapped_constant_buffer(st->draw, PIPE_SHADER_VERTEX,
246                                   mapped_constants,
247                                   st->state.constants[PIPE_SHADER_VERTEX]->size);
248
249
250   /* draw here */
251   for (i = 0; i < nr_prims; i++) {
252      draw_arrays(draw, prims[i].mode, prims[i].start, prims[i].count);
253   }
254
255
256   /* unmap constant buffers */
257   pipe_buffer_unmap(pipe->screen, st->state.constants[PIPE_SHADER_VERTEX]);
258
259   /*
260    * unmap vertex/index buffers
261    */
262   for (i = 0; i < PIPE_MAX_ATTRIBS; i++) {
263      if (draw->pt.vertex_buffer[i].buffer) {
264         pipe_buffer_unmap(pipe->screen, draw->pt.vertex_buffer[i].buffer);
265         pipe_buffer_reference(&draw->pt.vertex_buffer[i].buffer, NULL);
266         draw_set_mapped_vertex_buffer(draw, i, NULL);
267      }
268   }
269   if (index_buffer_handle) {
270      pipe_buffer_unmap(pipe->screen, index_buffer_handle);
271      draw_set_mapped_element_buffer(draw, 0, NULL);
272   }
273}
274
275#endif /* FEATURE_feedback || FEATURE_drawpix */
276
277