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 #include "main/mfeatures.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 "util/u_inlines.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  * Called by VBO to draw arrays when in selection or feedback mode and
  86  * to implement glRasterPos.
  87  * This is very much like the normal draw_vbo() function above.
  88  * Look at code refactoring some day.
  89  */
  90 void
  91 st_feedback_draw_vbo(struct gl_context *ctx,
  92                      const struct _mesa_prim *prims,
  93                      GLuint nr_prims,
  94                      const struct _mesa_index_buffer *ib,
  95                      GLboolean index_bounds_valid,
  96                      GLuint min_index,
  97                      GLuint max_index,
  98                      struct gl_transform_feedback_object *tfb_vertcount)
  99 {
 100    struct st_context *st = st_context(ctx);
 101    struct pipe_context *pipe = st->pipe;
 102    struct draw_context *draw = st->draw;
 103    const struct st_vertex_program *vp;
 104    const struct pipe_shader_state *vs;
 105    struct pipe_vertex_buffer vbuffers[PIPE_MAX_SHADER_INPUTS];
 106    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 107    struct pipe_index_buffer ibuffer;
 108    struct pipe_transfer *vb_transfer[PIPE_MAX_ATTRIBS] = {NULL};
 109    struct pipe_transfer *ib_transfer = NULL;
 110    const struct gl_client_array **arrays = ctx->Array._DrawArrays;
 111    GLuint attr, i;
 112    const GLubyte *low_addr = NULL;
 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_indices(ctx, prims, ib, &min_index, &max_index, nr_prims);
 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    /* Find the lowest address of the arrays we're drawing */
 144    if (vp->num_inputs) {
 145       low_addr = arrays[vp->index_to_input[0]]->Ptr;
 146
 147       for (attr = 1; attr < vp->num_inputs; attr++) {
 148          const GLubyte *start = arrays[vp->index_to_input[attr]]->Ptr;
 149          low_addr = MIN2(low_addr, start);
 150       }
 151    }
 152
 153    /* loop over TGSI shader inputs to determine vertex buffer
 154     * and attribute info
 155     */
 156    for (attr = 0; attr < vp->num_inputs; attr++) {
 157       const GLuint mesaAttr = vp->index_to_input[attr];
 158       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 159       void *map;
 160
 161       if (bufobj && bufobj->Name) {
 162          /* Attribute data is in a VBO.
 163           * Recall that for VBOs, the gl_client_array->Ptr field is
 164           * really an offset from the start of the VBO, not a pointer.
 165           */
 166          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 167          assert(stobj->buffer);
 168
 169          vbuffers[attr].buffer = NULL;
 170          vbuffers[attr].user_buffer = NULL;
 171          pipe_resource_reference(&vbuffers[attr].buffer, stobj->buffer);
 172          vbuffers[attr].buffer_offset = pointer_to_offset(low_addr);
 173          velements[attr].src_offset = arrays[mesaAttr]->Ptr - low_addr;
 174
 175          /* map the attrib buffer */
 176          map = pipe_buffer_map(pipe, vbuffers[attr].buffer,
 177                                PIPE_TRANSFER_READ,
 178                                &vb_transfer[attr]);
 179          draw_set_mapped_vertex_buffer(draw, attr, map);
 180       }
 181       else {
 182          vbuffers[attr].buffer = NULL;
 183          vbuffers[attr].user_buffer = arrays[mesaAttr]->Ptr;
 184          vbuffers[attr].buffer_offset = 0;
 185          velements[attr].src_offset = 0;
 186
 187          draw_set_mapped_vertex_buffer(draw, attr, vbuffers[attr].user_buffer);
 188       }
 189
 190       /* common-case setup */
 191       vbuffers[attr].stride = arrays[mesaAttr]->StrideB; /* in bytes */
 192       velements[attr].instance_divisor = 0;
 193       velements[attr].vertex_buffer_index = attr;
 194       velements[attr].src_format =
 195          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 196                                arrays[mesaAttr]->Size,
 197                                arrays[mesaAttr]->Format,
 198                                arrays[mesaAttr]->Normalized,
 199                                arrays[mesaAttr]->Integer);
 200       assert(velements[attr].src_format);
 201
 202       /* tell draw about this attribute */
 203 #if 0
 204       draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);
 205 #endif
 206    }
 207
 208    draw_set_vertex_buffers(draw, vp->num_inputs, vbuffers);
 209    draw_set_vertex_elements(draw, vp->num_inputs, velements);
 210
 211    memset(&ibuffer, 0, sizeof(ibuffer));
 212    if (ib) {
 213       struct gl_buffer_object *bufobj = ib->obj;
 214
 215       ibuffer.index_size = vbo_sizeof_ib_type(ib->type);
 216       if (ibuffer.index_size == 0)
 217          goto out_unref_vertex;
 218
 219       if (bufobj && bufobj->Name) {
 220          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 221
 222          pipe_resource_reference(&ibuffer.buffer, stobj->buffer);
 223          ibuffer.offset = pointer_to_offset(ib->ptr);
 224
 225          mapped_indices = pipe_buffer_map(pipe, stobj->buffer,
 226                                           PIPE_TRANSFER_READ, &ib_transfer);
 227       }
 228       else {
 229          /* skip setting ibuffer.buffer as the draw module does not use it */
 230          mapped_indices = ib->ptr;
 231       }
 232
 233       draw_set_indexes(draw,
 234                        (ubyte *) mapped_indices + ibuffer.offset,
 235                        ibuffer.index_size);
 236    }
 237
 238    /* set the constant buffer */
 239    draw_set_mapped_constant_buffer(st->draw, PIPE_SHADER_VERTEX, 0,
 240                                    st->state.constants[PIPE_SHADER_VERTEX].ptr,
 241                                    st->state.constants[PIPE_SHADER_VERTEX].size);
 242
 243
 244    /* draw here */
 245    for (i = 0; i < nr_prims; i++) {
 246       draw_arrays(draw, prims[i].mode, prims[i].start, prims[i].count);
 247    }
 248
 249
 250    /*
 251     * unmap vertex/index buffers
 252     */
 253    if (ib) {
 254       draw_set_indexes(draw, NULL, 0);
 255       if (ib_transfer)
 256          pipe_buffer_unmap(pipe, ib_transfer);
 257       pipe_resource_reference(&ibuffer.buffer, NULL);
 258    }
 259
 260  out_unref_vertex:
 261    for (attr = 0; attr < vp->num_inputs; attr++) {
 262       if (vb_transfer[attr])
 263          pipe_buffer_unmap(pipe, vb_transfer[attr]);
 264       draw_set_mapped_vertex_buffer(draw, attr, NULL);
 265       pipe_resource_reference(&vbuffers[attr].buffer, NULL);
 266    }
 267    draw_set_vertex_buffers(draw, 0, NULL);
 268 }