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_rastpos
  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(struct gl_context *ctx)
  56 {
  57 #if 0
  58    struct st_context *st = st_context(ctx);
  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(struct gl_context *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 = st_context(ctx);
 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_vertex_buffer vbuffers[PIPE_MAX_SHADER_INPUTS];
 108    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 109    struct pipe_index_buffer ibuffer;
 110    struct pipe_transfer *vb_transfer[PIPE_MAX_ATTRIBS];
 111    struct pipe_transfer *ib_transfer = NULL;
 112    GLuint attr, i;
 113    const void *mapped_indices = NULL;
 114
 115    assert(draw);
 116
 117    st_validate_state(st);
 118
 119    if (!index_bounds_valid)
 120       vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 121
 122    /* must get these after state validation! */
 123    vp = st->vp;
 124    vs = &st->vp_variant->tgsi;
 125
 126    if (!st->vp_variant->draw_shader) {
 127       st->vp_variant->draw_shader = draw_create_vertex_shader(draw, vs);
 128    }
 129
 130    /*
 131     * Set up the draw module's state.
 132     *
 133     * We'd like to do this less frequently, but the normal state-update
 134     * code sends state updates to the pipe, not to our private draw module.
 135     */
 136    assert(draw);
 137    draw_set_viewport_state(draw, &st->state.viewport);
 138    draw_set_clip_state(draw, &st->state.clip);
 139    draw_set_rasterizer_state(draw, &st->state.rasterizer, NULL);
 140    draw_bind_vertex_shader(draw, st->vp_variant->draw_shader);
 141    set_feedback_vertex_format(ctx);
 142
 143    /* loop over TGSI shader inputs to determine vertex buffer
 144     * and attribute info
 145     */
 146    for (attr = 0; attr < vp->num_inputs; attr++) {
 147       const GLuint mesaAttr = vp->index_to_input[attr];
 148       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 149       void *map;
 150
 151       if (bufobj && bufobj->Name) {
 152          /* Attribute data is in a VBO.
 153           * Recall that for VBOs, the gl_client_array->Ptr field is
 154           * really an offset from the start of the VBO, not a pointer.
 155           */
 156          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 157          assert(stobj->buffer);
 158
 159          vbuffers[attr].buffer = NULL;
 160          pipe_resource_reference(&vbuffers[attr].buffer, stobj->buffer);
 161          vbuffers[attr].buffer_offset = pointer_to_offset(arrays[0]->Ptr);
 162          velements[attr].src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 163       }
 164       else {
 165          /* attribute data is in user-space memory, not a VBO */
 166          uint bytes = (arrays[mesaAttr]->Size
 167                        * _mesa_sizeof_type(arrays[mesaAttr]->Type)
 168                        * (max_index + 1));
 169
 170          /* wrap user data */
 171          vbuffers[attr].buffer
 172             = pipe_user_buffer_create(pipe->screen, (void *) arrays[mesaAttr]->Ptr,
 173                                       bytes,
 174                                       PIPE_BIND_VERTEX_BUFFER);
 175          vbuffers[attr].buffer_offset = 0;
 176          velements[attr].src_offset = 0;
 177       }
 178
 179       /* common-case setup */
 180       vbuffers[attr].stride = arrays[mesaAttr]->StrideB; /* in bytes */
 181       vbuffers[attr].max_index = max_index;
 182       velements[attr].instance_divisor = 0;
 183       velements[attr].vertex_buffer_index = attr;
 184       velements[attr].src_format =
 185          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 186                                arrays[mesaAttr]->Size,
 187                                arrays[mesaAttr]->Format,
 188                                arrays[mesaAttr]->Normalized);
 189       assert(velements[attr].src_format);
 190
 191       /* tell draw about this attribute */
 192 #if 0
 193       draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);
 194 #endif
 195
 196       /* map the attrib buffer */
 197       map = pipe_buffer_map(pipe, vbuffers[attr].buffer,
 198                             PIPE_TRANSFER_READ,
 199                             &vb_transfer[attr]);
 200       draw_set_mapped_vertex_buffer(draw, attr, map);
 201    }
 202
 203    draw_set_vertex_buffers(draw, vp->num_inputs, vbuffers);
 204    draw_set_vertex_elements(draw, vp->num_inputs, velements);
 205
 206    memset(&ibuffer, 0, sizeof(ibuffer));
 207    if (ib) {
 208       struct gl_buffer_object *bufobj = ib->obj;
 209
 210       switch (ib->type) {
 211       case GL_UNSIGNED_INT:
 212          ibuffer.index_size = 4;
 213          break;
 214       case GL_UNSIGNED_SHORT:
 215          ibuffer.index_size = 2;
 216          break;
 217       case GL_UNSIGNED_BYTE:
 218          ibuffer.index_size = 1;
 219          break;
 220       default:
 221          assert(0);
 222          return;
 223       }
 224
 225       if (bufobj && bufobj->Name) {
 226          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 227
 228          pipe_resource_reference(&ibuffer.buffer, stobj->buffer);
 229          ibuffer.offset = pointer_to_offset(ib->ptr);
 230
 231          mapped_indices = pipe_buffer_map(pipe, stobj->buffer,
 232                                           PIPE_TRANSFER_READ, &ib_transfer);
 233       }
 234       else {
 235          /* skip setting ibuffer.buffer as the draw module does not use it */
 236          mapped_indices = ib->ptr;
 237       }
 238
 239       draw_set_index_buffer(draw, &ibuffer);
 240       draw_set_mapped_index_buffer(draw, mapped_indices);
 241    }
 242
 243    /* set the constant buffer */
 244    draw_set_mapped_constant_buffer(st->draw, PIPE_SHADER_VERTEX, 0,
 245                                    st->state.constants[PIPE_SHADER_VERTEX].ptr,
 246                                    st->state.constants[PIPE_SHADER_VERTEX].size);
 247
 248
 249    /* draw here */
 250    for (i = 0; i < nr_prims; i++) {
 251       draw_arrays(draw, prims[i].mode, prims[i].start, prims[i].count);
 252    }
 253
 254
 255    /*
 256     * unmap vertex/index buffers
 257     */
 258    for (i = 0; i < PIPE_MAX_ATTRIBS; i++) {
 259       if (draw->pt.vertex_buffer[i].buffer) {
 260          pipe_buffer_unmap(pipe, vb_transfer[i]);
 261          pipe_resource_reference(&draw->pt.vertex_buffer[i].buffer, NULL);
 262          draw_set_mapped_vertex_buffer(draw, i, NULL);
 263       }
 264    }
 265
 266    if (ib) {
 267       draw_set_mapped_index_buffer(draw, NULL);
 268       draw_set_index_buffer(draw, NULL);
 269
 270       if (ib_transfer)
 271          pipe_buffer_unmap(pipe, ib_transfer);
 272       pipe_resource_reference(&ibuffer.buffer, NULL);
 273    }
 274 }
 275
 276 #endif /* FEATURE_feedback || FEATURE_rastpos */
 277