src/mesa/state_tracker/st_draw_feedback.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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 VMWARE 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 #include "util/u_draw.h"
  44
  45 #include "draw/draw_private.h"
  46 #include "draw/draw_context.h"
  47
  48
  49 /**
  50  * Set the (private) draw module's post-transformed vertex format when in
  51  * GL_SELECT or GL_FEEDBACK mode or for glRasterPos.
  52  */
  53 static void
  54 set_feedback_vertex_format(struct gl_context *ctx)
  55 {
  56 #if 0
  57    struct st_context *st = st_context(ctx);
  58    struct vertex_info vinfo;
  59    GLuint i;
  60
  61    memset(&vinfo, 0, sizeof(vinfo));
  62
  63    if (ctx->RenderMode == GL_SELECT) {
  64       assert(ctx->RenderMode == GL_SELECT);
  65       vinfo.num_attribs = 1;
  66       vinfo.format[0] = FORMAT_4F;
  67       vinfo.interp_mode[0] = INTERP_LINEAR;
  68    }
  69    else {
  70       /* GL_FEEDBACK, or glRasterPos */
  71       /* emit all attribs (pos, color, texcoord) as GLfloat[4] */
  72       vinfo.num_attribs = st->state.vs->cso->state.num_outputs;
  73       for (i = 0; i < vinfo.num_attribs; i++) {
  74          vinfo.format[i] = FORMAT_4F;
  75          vinfo.interp_mode[i] = INTERP_LINEAR;
  76       }
  77    }
  78
  79    draw_set_vertex_info(st->draw, &vinfo);
  80 #endif
  81 }
  82
  83
  84 /**
  85  * Helper for drawing current vertex arrays.
  86  */
  87 static void
  88 draw_arrays(struct draw_context *draw, unsigned mode,
  89             unsigned start, unsigned count)
  90 {
  91    struct pipe_draw_info info;
  92
  93    util_draw_init_info(&info);
  94
  95    info.mode = mode;
  96    info.start = start;
  97    info.count = count;
  98    info.min_index = start;
  99    info.max_index = start + count - 1;
 100
 101    draw_vbo(draw, &info);
 102 }
 103
 104
 105 /**
 106  * Called by VBO to draw arrays when in selection or feedback mode and
 107  * to implement glRasterPos.
 108  * This is very much like the normal draw_vbo() function above.
 109  * Look at code refactoring some day.
 110  */
 111 void
 112 st_feedback_draw_vbo(struct gl_context *ctx,
 113                      const struct _mesa_prim *prims,
 114                      GLuint nr_prims,
 115                      const struct _mesa_index_buffer *ib,
 116                      GLboolean index_bounds_valid,
 117                      GLuint min_index,
 118                      GLuint max_index,
 119                      struct gl_transform_feedback_object *tfb_vertcount,
 120                      struct gl_buffer_object *indirect)
 121 {
 122    struct st_context *st = st_context(ctx);
 123    struct pipe_context *pipe = st->pipe;
 124    struct draw_context *draw = st->draw;
 125    const struct st_vertex_program *vp;
 126    const struct pipe_shader_state *vs;
 127    struct pipe_vertex_buffer vbuffers[PIPE_MAX_SHADER_INPUTS];
 128    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 129    struct pipe_index_buffer ibuffer;
 130    struct pipe_transfer *vb_transfer[PIPE_MAX_ATTRIBS] = {NULL};
 131    struct pipe_transfer *ib_transfer = NULL;
 132    const struct gl_client_array **arrays = ctx->Array._DrawArrays;
 133    GLuint attr, i;
 134    const GLubyte *low_addr = NULL;
 135    const void *mapped_indices = NULL;
 136
 137    assert(draw);
 138
 139    st_validate_state(st);
 140
 141    if (!index_bounds_valid)
 142       vbo_get_minmax_indices(ctx, prims, ib, &min_index, &max_index, nr_prims);
 143
 144    /* must get these after state validation! */
 145    vp = st->vp;
 146    vs = &st->vp_variant->tgsi;
 147
 148    if (!st->vp_variant->draw_shader) {
 149       st->vp_variant->draw_shader = draw_create_vertex_shader(draw, vs);
 150    }
 151
 152    /*
 153     * Set up the draw module's state.
 154     *
 155     * We'd like to do this less frequently, but the normal state-update
 156     * code sends state updates to the pipe, not to our private draw module.
 157     */
 158    assert(draw);
 159    draw_set_viewport_states(draw, 0, 1, &st->state.viewport[0]);
 160    draw_set_clip_state(draw, &st->state.clip);
 161    draw_set_rasterizer_state(draw, &st->state.rasterizer, NULL);
 162    draw_bind_vertex_shader(draw, st->vp_variant->draw_shader);
 163    set_feedback_vertex_format(ctx);
 164
 165    /* Find the lowest address of the arrays we're drawing */
 166    if (vp->num_inputs) {
 167       low_addr = arrays[vp->index_to_input[0]]->Ptr;
 168
 169       for (attr = 1; attr < vp->num_inputs; attr++) {
 170          const GLubyte *start = arrays[vp->index_to_input[attr]]->Ptr;
 171          low_addr = MIN2(low_addr, start);
 172       }
 173    }
 174
 175    /* loop over TGSI shader inputs to determine vertex buffer
 176     * and attribute info
 177     */
 178    for (attr = 0; attr < vp->num_inputs; attr++) {
 179       const GLuint mesaAttr = vp->index_to_input[attr];
 180       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 181       void *map;
 182
 183       if (bufobj && bufobj->Name) {
 184          /* Attribute data is in a VBO.
 185           * Recall that for VBOs, the gl_client_array->Ptr field is
 186           * really an offset from the start of the VBO, not a pointer.
 187           */
 188          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 189          assert(stobj->buffer);
 190
 191          vbuffers[attr].buffer = NULL;
 192          vbuffers[attr].user_buffer = NULL;
 193          pipe_resource_reference(&vbuffers[attr].buffer, stobj->buffer);
 194          vbuffers[attr].buffer_offset = pointer_to_offset(low_addr);
 195          velements[attr].src_offset = arrays[mesaAttr]->Ptr - low_addr;
 196
 197          /* map the attrib buffer */
 198          map = pipe_buffer_map(pipe, vbuffers[attr].buffer,
 199                                PIPE_TRANSFER_READ,
 200                                &vb_transfer[attr]);
 201          draw_set_mapped_vertex_buffer(draw, attr, map,
 202                                        vbuffers[attr].buffer->width0);
 203       }
 204       else {
 205          vbuffers[attr].buffer = NULL;
 206          vbuffers[attr].user_buffer = arrays[mesaAttr]->Ptr;
 207          vbuffers[attr].buffer_offset = 0;
 208          velements[attr].src_offset = 0;
 209
 210          draw_set_mapped_vertex_buffer(draw, attr, vbuffers[attr].user_buffer,
 211                                        ~0);
 212       }
 213
 214       /* common-case setup */
 215       vbuffers[attr].stride = arrays[mesaAttr]->StrideB; /* in bytes */
 216       velements[attr].instance_divisor = 0;
 217       velements[attr].vertex_buffer_index = attr;
 218       velements[attr].src_format =
 219          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 220                                arrays[mesaAttr]->Size,
 221                                arrays[mesaAttr]->Format,
 222                                arrays[mesaAttr]->Normalized,
 223                                arrays[mesaAttr]->Integer);
 224       assert(velements[attr].src_format);
 225
 226       /* tell draw about this attribute */
 227 #if 0
 228       draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);
 229 #endif
 230    }
 231
 232    draw_set_vertex_buffers(draw, 0, vp->num_inputs, vbuffers);
 233    draw_set_vertex_elements(draw, vp->num_inputs, velements);
 234
 235    memset(&ibuffer, 0, sizeof(ibuffer));
 236    if (ib) {
 237       struct gl_buffer_object *bufobj = ib->obj;
 238
 239       ibuffer.index_size = vbo_sizeof_ib_type(ib->type);
 240       if (ibuffer.index_size == 0)
 241          goto out_unref_vertex;
 242
 243       if (bufobj && bufobj->Name) {
 244          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 245
 246          pipe_resource_reference(&ibuffer.buffer, stobj->buffer);
 247          ibuffer.offset = pointer_to_offset(ib->ptr);
 248
 249          mapped_indices = pipe_buffer_map(pipe, stobj->buffer,
 250                                           PIPE_TRANSFER_READ, &ib_transfer);
 251       }
 252       else {
 253          /* skip setting ibuffer.buffer as the draw module does not use it */
 254          mapped_indices = ib->ptr;
 255       }
 256
 257       draw_set_indexes(draw,
 258                        (ubyte *) mapped_indices + ibuffer.offset,
 259                        ibuffer.index_size, ~0);
 260    }
 261
 262    /* set the constant buffer */
 263    draw_set_mapped_constant_buffer(st->draw, PIPE_SHADER_VERTEX, 0,
 264                                    st->state.constants[PIPE_SHADER_VERTEX].ptr,
 265                                    st->state.constants[PIPE_SHADER_VERTEX].size);
 266
 267
 268    /* draw here */
 269    for (i = 0; i < nr_prims; i++) {
 270       draw_arrays(draw, prims[i].mode, prims[i].start, prims[i].count);
 271    }
 272
 273
 274    /*
 275     * unmap vertex/index buffers
 276     */
 277    if (ib) {
 278       draw_set_indexes(draw, NULL, 0, 0);
 279       if (ib_transfer)
 280          pipe_buffer_unmap(pipe, ib_transfer);
 281       pipe_resource_reference(&ibuffer.buffer, NULL);
 282    }
 283
 284  out_unref_vertex:
 285    for (attr = 0; attr < vp->num_inputs; attr++) {
 286       if (vb_transfer[attr])
 287          pipe_buffer_unmap(pipe, vb_transfer[attr]);
 288       draw_set_mapped_vertex_buffer(draw, attr, NULL, 0);
 289       pipe_resource_reference(&vbuffers[attr].buffer, NULL);
 290    }
 291    draw_set_vertex_buffers(draw, 0, vp->num_inputs, NULL);
 292 }