src/mesa/state_tracker/st_draw_feedback.c

   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
  32 #include "vbo/vbo.h"
  33
  34 #include "st_context.h"
  35 #include "st_atom.h"
  36 #include "st_cb_bufferobjects.h"
  37 #include "st_draw.h"
  38 #include "st_program.h"
  39
  40 #include "pipe/p_context.h"
  41 #include "pipe/p_defines.h"
  42 #include "util/u_inlines.h"
  43
  44 #include "draw/draw_private.h"
  45 #include "draw/draw_context.h"
  46
  47
  48 #if FEATURE_feedback || FEATURE_drawpix
  49
  50 /**
  51  * Set the (private) draw module's post-transformed vertex format when in
  52  * GL_SELECT or GL_FEEDBACK mode or for glRasterPos.
  53  */
  54 static void
  55 set_feedback_vertex_format(GLcontext *ctx)
  56 {
  57 #if 0
  58    struct st_context *st = ctx->st;
  59    struct vertex_info vinfo;
  60    GLuint i;
  61
  62    memset(&vinfo, 0, sizeof(vinfo));
  63
  64    if (ctx->RenderMode == GL_SELECT) {
  65       assert(ctx->RenderMode == GL_SELECT);
  66       vinfo.num_attribs = 1;
  67       vinfo.format[0] = FORMAT_4F;
  68       vinfo.interp_mode[0] = INTERP_LINEAR;
  69    }
  70    else {
  71       /* GL_FEEDBACK, or glRasterPos */
  72       /* emit all attribs (pos, color, texcoord) as GLfloat[4] */
  73       vinfo.num_attribs = st->state.vs->cso->state.num_outputs;
  74       for (i = 0; i < vinfo.num_attribs; i++) {
  75          vinfo.format[i] = FORMAT_4F;
  76          vinfo.interp_mode[i] = INTERP_LINEAR;
  77       }
  78    }
  79
  80    draw_set_vertex_info(st->draw, &vinfo);
  81 #endif
  82 }
  83
  84
  85 /**
  86  * Called by VBO to draw arrays when in selection or feedback mode and
  87  * to implement glRasterPos.
  88  * This is very much like the normal draw_vbo() function above.
  89  * Look at code refactoring some day.
  90  * Might move this into the failover module some day.
  91  */
  92 void
  93 st_feedback_draw_vbo(GLcontext *ctx,
  94                      const struct gl_client_array **arrays,
  95                      const struct _mesa_prim *prims,
  96                      GLuint nr_prims,
  97                      const struct _mesa_index_buffer *ib,
  98                      GLboolean index_bounds_valid,
  99                      GLuint min_index,
 100                      GLuint max_index)
 101 {
 102    struct st_context *st = ctx->st;
 103    struct pipe_context *pipe = st->pipe;
 104    struct draw_context *draw = st->draw;
 105    const struct st_vertex_program *vp;
 106    const struct pipe_shader_state *vs;
 107    struct pipe_buffer *index_buffer_handle = 0;
 108    struct pipe_vertex_buffer vbuffers[PIPE_MAX_SHADER_INPUTS];
 109    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 110    GLuint attr, i;
 111    ubyte *mapped_constants;
 112
 113    assert(draw);
 114
 115    st_validate_state(ctx->st);
 116
 117    if (!index_bounds_valid)
 118       vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 119
 120    /* must get these after state validation! */
 121    vp = ctx->st->vp;
 122    vs = &st->vp_varient->tgsi;
 123
 124    if (!st->vp_varient->draw_shader) {
 125       st->vp_varient->draw_shader = draw_create_vertex_shader(draw, vs);
 126    }
 127
 128    /*
 129     * Set up the draw module's state.
 130     *
 131     * We'd like to do this less frequently, but the normal state-update
 132     * code sends state updates to the pipe, not to our private draw module.
 133     */
 134    assert(draw);
 135    draw_set_viewport_state(draw, &st->state.viewport);
 136    draw_set_clip_state(draw, &st->state.clip);
 137    draw_set_rasterizer_state(draw, &st->state.rasterizer);
 138    draw_bind_vertex_shader(draw, st->vp_varient->draw_shader);
 139    set_feedback_vertex_format(ctx);
 140
 141    /* loop over TGSI shader inputs to determine vertex buffer
 142     * and attribute info
 143     */
 144    for (attr = 0; attr < vp->num_inputs; attr++) {
 145       const GLuint mesaAttr = vp->index_to_input[attr];
 146       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 147       void *map;
 148
 149       if (bufobj && bufobj->Name) {
 150          /* Attribute data is in a VBO.
 151           * Recall that for VBOs, the gl_client_array->Ptr field is
 152           * really an offset from the start of the VBO, not a pointer.
 153           */
 154          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 155          assert(stobj->buffer);
 156
 157          vbuffers[attr].buffer = NULL;
 158          pipe_buffer_reference(&vbuffers[attr].buffer, stobj->buffer);
 159          vbuffers[attr].buffer_offset = pointer_to_offset(arrays[0]->Ptr);
 160          velements[attr].src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 161       }
 162       else {
 163          /* attribute data is in user-space memory, not a VBO */
 164          uint bytes = (arrays[mesaAttr]->Size
 165                        * _mesa_sizeof_type(arrays[mesaAttr]->Type)
 166                        * (max_index + 1));
 167
 168          /* wrap user data */
 169          vbuffers[attr].buffer
 170             = pipe_user_buffer_create(pipe->screen, (void *) arrays[mesaAttr]->Ptr,
 171                                       bytes);
 172          vbuffers[attr].buffer_offset = 0;
 173          velements[attr].src_offset = 0;
 174       }
 175
 176       /* common-case setup */
 177       vbuffers[attr].stride = arrays[mesaAttr]->StrideB; /* in bytes */
 178       vbuffers[attr].max_index = max_index;
 179       velements[attr].instance_divisor = 0;
 180       velements[attr].vertex_buffer_index = attr;
 181       velements[attr].src_format =
 182          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 183                                arrays[mesaAttr]->Size,
 184                                arrays[mesaAttr]->Format,
 185                                arrays[mesaAttr]->Normalized);
 186       assert(velements[attr].src_format);
 187
 188       /* tell draw about this attribute */
 189 #if 0
 190       draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);
 191 #endif
 192
 193       /* map the attrib buffer */
 194       map = pipe_buffer_map(pipe->screen, vbuffers[attr].buffer,
 195                             PIPE_BUFFER_USAGE_CPU_READ);
 196       draw_set_mapped_vertex_buffer(draw, attr, map);
 197    }
 198
 199    draw_set_vertex_buffers(draw, vp->num_inputs, vbuffers);
 200    draw_set_vertex_elements(draw, vp->num_inputs, velements);
 201
 202    if (ib) {
 203       struct gl_buffer_object *bufobj = ib->obj;
 204       unsigned indexSize;
 205       void *map;
 206
 207       switch (ib->type) {
 208       case GL_UNSIGNED_INT:
 209          indexSize = 4;
 210          break;
 211       case GL_UNSIGNED_SHORT:
 212          indexSize = 2;
 213          break;
 214       default:
 215          assert(0);
 216          return;
 217       }
 218
 219       if (bufobj && bufobj->Name) {
 220          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 221
 222          index_buffer_handle = stobj->buffer;
 223
 224          map = pipe_buffer_map(pipe->screen, index_buffer_handle,
 225                                PIPE_BUFFER_USAGE_CPU_READ);
 226
 227          draw_set_mapped_element_buffer(draw, indexSize, map);
 228       }
 229       else {
 230          draw_set_mapped_element_buffer(draw, indexSize, (void *) ib->ptr);
 231       }
 232    }
 233    else {
 234       /* no index/element buffer */
 235       draw_set_mapped_element_buffer(draw, 0, NULL);
 236    }
 237
 238
 239    /* map constant buffers */
 240    mapped_constants = pipe_buffer_map(pipe->screen,
 241                                       st->state.constants[PIPE_SHADER_VERTEX],
 242                                       PIPE_BUFFER_USAGE_CPU_READ);
 243    draw_set_mapped_constant_buffer(st->draw, PIPE_SHADER_VERTEX, 0,
 244                                    mapped_constants,
 245                                    st->state.constants[PIPE_SHADER_VERTEX]->size);
 246
 247
 248    /* draw here */
 249    for (i = 0; i < nr_prims; i++) {
 250       draw_arrays(draw, prims[i].mode, prims[i].start, prims[i].count);
 251    }
 252
 253
 254    /* unmap constant buffers */
 255    pipe_buffer_unmap(pipe->screen, st->state.constants[PIPE_SHADER_VERTEX]);
 256
 257    /*
 258     * unmap vertex/index buffers
 259     */
 260    for (i = 0; i < PIPE_MAX_ATTRIBS; i++) {
 261       if (draw->pt.vertex_buffer[i].buffer) {
 262          pipe_buffer_unmap(pipe->screen, draw->pt.vertex_buffer[i].buffer);
 263          pipe_buffer_reference(&draw->pt.vertex_buffer[i].buffer, NULL);
 264          draw_set_mapped_vertex_buffer(draw, i, NULL);
 265       }
 266    }
 267    if (index_buffer_handle) {
 268       pipe_buffer_unmap(pipe->screen, index_buffer_handle);
 269       draw_set_mapped_element_buffer(draw, 0, NULL);
 270    }
 271 }
 272
 273 #endif /* FEATURE_feedback || FEATURE_drawpix */
 274