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 "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  */
  55 static void
  56 set_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  */
  93 void
  94 st_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                      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    /* must get these after state validation! */
 118    vp = ctx->st->vp;
 119    vs = &st->vp->state;
 120
 121    if (!st->vp->draw_shader) {
 122       st->vp->draw_shader = draw_create_vertex_shader(draw, vs);
 123    }
 124
 125    /*
 126     * Set up the draw module's state.
 127     *
 128     * We'd like to do this less frequently, but the normal state-update
 129     * code sends state updates to the pipe, not to our private draw module.
 130     */
 131    assert(draw);
 132    draw_set_viewport_state(draw, &st->state.viewport);
 133    draw_set_clip_state(draw, &st->state.clip);
 134    draw_set_rasterizer_state(draw, &st->state.rasterizer);
 135    draw_bind_vertex_shader(draw, st->vp->draw_shader);
 136    set_feedback_vertex_format(ctx);
 137
 138    /* loop over TGSI shader inputs to determine vertex buffer
 139     * and attribute info
 140     */
 141    for (attr = 0; attr < vp->num_inputs; attr++) {
 142       const GLuint mesaAttr = vp->index_to_input[attr];
 143       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 144       void *map;
 145
 146       if (bufobj && bufobj->Name) {
 147          /* Attribute data is in a VBO.
 148           * Recall that for VBOs, the gl_client_array->Ptr field is
 149           * really an offset from the start of the VBO, not a pointer.
 150           */
 151          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 152          assert(stobj->buffer);
 153
 154          vbuffers[attr].buffer = NULL;
 155          pipe_buffer_reference(&vbuffers[attr].buffer, stobj->buffer);
 156          vbuffers[attr].buffer_offset = pointer_to_offset(arrays[0]->Ptr);
 157          velements[attr].src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 158       }
 159       else {
 160          /* attribute data is in user-space memory, not a VBO */
 161          uint bytes = (arrays[mesaAttr]->Size
 162                        * _mesa_sizeof_type(arrays[mesaAttr]->Type)
 163                        * (max_index + 1));
 164
 165          /* wrap user data */
 166          vbuffers[attr].buffer
 167             = pipe_user_buffer_create(pipe->screen, (void *) arrays[mesaAttr]->Ptr,
 168                                       bytes);
 169          vbuffers[attr].buffer_offset = 0;
 170          velements[attr].src_offset = 0;
 171       }
 172
 173       /* common-case setup */
 174       vbuffers[attr].stride = arrays[mesaAttr]->StrideB; /* in bytes */
 175       vbuffers[attr].max_index = max_index;
 176       velements[attr].vertex_buffer_index = attr;
 177       velements[attr].nr_components = arrays[mesaAttr]->Size;
 178       velements[attr].src_format =
 179          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 180                                arrays[mesaAttr]->Size,
 181                                arrays[mesaAttr]->Format,
 182                                arrays[mesaAttr]->Normalized);
 183       assert(velements[attr].src_format);
 184
 185       /* tell draw about this attribute */
 186 #if 0
 187       draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);
 188 #endif
 189
 190       /* map the attrib buffer */
 191       map = pipe_buffer_map(pipe->screen, vbuffers[attr].buffer,
 192                             PIPE_BUFFER_USAGE_CPU_READ);
 193       draw_set_mapped_vertex_buffer(draw, attr, map);
 194    }
 195
 196    draw_set_vertex_buffers(draw, vp->num_inputs, vbuffers);
 197    draw_set_vertex_elements(draw, vp->num_inputs, velements);
 198
 199    if (ib) {
 200       struct gl_buffer_object *bufobj = ib->obj;
 201       unsigned indexSize;
 202       void *map;
 203
 204       switch (ib->type) {
 205       case GL_UNSIGNED_INT:
 206          indexSize = 4;
 207          break;
 208       case GL_UNSIGNED_SHORT:
 209          indexSize = 2;
 210          break;
 211       default:
 212          assert(0);
 213          return;
 214       }
 215
 216       if (bufobj && bufobj->Name) {
 217          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 218
 219          index_buffer_handle = stobj->buffer;
 220
 221          map = pipe_buffer_map(pipe->screen, index_buffer_handle,
 222                                PIPE_BUFFER_USAGE_CPU_READ);
 223
 224          draw_set_mapped_element_buffer(draw, indexSize, map);
 225       }
 226       else {
 227          draw_set_mapped_element_buffer(draw, indexSize, (void *) ib->ptr);
 228       }
 229    }
 230    else {
 231       /* no index/element buffer */
 232       draw_set_mapped_element_buffer(draw, 0, NULL);
 233    }
 234
 235
 236    /* map constant buffers */
 237    mapped_constants = pipe_buffer_map(pipe->screen,
 238                                       st->state.constants[PIPE_SHADER_VERTEX].buffer,
 239                                       PIPE_BUFFER_USAGE_CPU_READ);
 240    draw_set_mapped_constant_buffer(st->draw, mapped_constants,
 241                                    st->state.constants[PIPE_SHADER_VERTEX].buffer->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    /* unmap constant buffers */
 251    pipe_buffer_unmap(pipe->screen, st->state.constants[PIPE_SHADER_VERTEX].buffer);
 252
 253    /*
 254     * unmap vertex/index buffers
 255     */
 256    for (i = 0; i < PIPE_MAX_ATTRIBS; i++) {
 257       if (draw->pt.vertex_buffer[i].buffer) {
 258          pipe_buffer_unmap(pipe->screen, draw->pt.vertex_buffer[i].buffer);
 259          pipe_buffer_reference(&draw->pt.vertex_buffer[i].buffer, NULL);
 260          draw_set_mapped_vertex_buffer(draw, i, NULL);
 261       }
 262    }
 263    if (index_buffer_handle) {
 264       pipe_buffer_unmap(pipe->screen, index_buffer_handle);
 265       draw_set_mapped_element_buffer(draw, 0, NULL);
 266    }
 267 }
 268
 269 #endif /* FEATURE_feedback || FEATURE_drawpix */
 270