reactos/dll/opengl/mesa/src/mesa/state_tracker/st_cb_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 /**
  29  * GL_SELECT and GL_FEEDBACK render modes.
  30  * Basically, we use a private instance of the 'draw' module for doing
  31  * selection/feedback.  It would be nice to use the transform_feedback
  32  * hardware feature, but it's defined as happening pre-clip and we want
  33  * post-clipped primitives.  Also, there's concerns about the efficiency
  34  * of using the hardware for this anyway.
  35  *
  36  * Authors:
  37  *   Brian Paul
  38  */
  39
  40 #include "main/imports.h"
  41 #include "main/context.h"
  42 #include "main/feedback.h"
  43 #include "main/mfeatures.h"
  44
  45 #include "vbo/vbo.h"
  46
  47 #include "st_context.h"
  48 #include "st_draw.h"
  49 #include "st_cb_feedback.h"
  50
  51 #include "pipe/p_context.h"
  52 #include "pipe/p_defines.h"
  53
  54 #include "draw/draw_context.h"
  55 #include "draw/draw_pipe.h"
  56
  57
  58 #if FEATURE_feedback
  59
  60 /**
  61  * This is actually used for both feedback and selection.
  62  */
  63 struct feedback_stage
  64 {
  65    struct draw_stage stage;   /**< Base class */
  66    struct gl_context *ctx;            /**< Rendering context */
  67    GLboolean reset_stipple_counter;
  68 };
  69
  70
  71 /**********************************************************************
  72  * GL Feedback functions
  73  **********************************************************************/
  74
  75 static INLINE struct feedback_stage *
  76 feedback_stage( struct draw_stage *stage )
  77 {
  78    return (struct feedback_stage *)stage;
  79 }
  80
  81
  82 static void
  83 feedback_vertex(struct gl_context *ctx, const struct draw_context *draw,
  84                 const struct vertex_header *v)
  85 {
  86    const struct st_context *st = st_context(ctx);
  87    GLfloat win[4];
  88    const GLfloat *color, *texcoord;
  89    GLuint slot;
  90
  91    /* Recall that Y=0=Top of window for Gallium wincoords */
  92    win[0] = v->data[0][0];
  93    win[1] = ctx->DrawBuffer->Height - v->data[0][1];
  94    win[2] = v->data[0][2];
  95    win[3] = 1.0F / v->data[0][3];
  96
  97    /* XXX
  98     * When we compute vertex layout, save info about position of the
  99     * color and texcoord attribs to use here.
 100     */
 101
 102    slot = st->vertex_result_to_slot[VERT_RESULT_COL0];
 103    if (slot != ~0U)
 104       color = v->data[slot];
 105    else
 106       color = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
 107
 108    slot = st->vertex_result_to_slot[VERT_RESULT_TEX0];
 109    if (slot != ~0U)
 110       texcoord = v->data[slot];
 111    else
 112       texcoord = ctx->Current.Attrib[VERT_ATTRIB_TEX0];
 113
 114    _mesa_feedback_vertex(ctx, win, color, texcoord);
 115 }
 116
 117
 118 static void
 119 feedback_tri( struct draw_stage *stage, struct prim_header *prim )
 120 {
 121    struct feedback_stage *fs = feedback_stage(stage);
 122    struct draw_context *draw = stage->draw;
 123    _mesa_feedback_token(fs->ctx, (GLfloat) GL_POLYGON_TOKEN);
 124    _mesa_feedback_token(fs->ctx, (GLfloat) 3); /* three vertices */
 125    feedback_vertex(fs->ctx, draw, prim->v[0]);
 126    feedback_vertex(fs->ctx, draw, prim->v[1]);
 127    feedback_vertex(fs->ctx, draw, prim->v[2]);
 128 }
 129
 130
 131 static void
 132 feedback_line( struct draw_stage *stage, struct prim_header *prim )
 133 {
 134    struct feedback_stage *fs = feedback_stage(stage);
 135    struct draw_context *draw = stage->draw;
 136    if (fs->reset_stipple_counter) {
 137       _mesa_feedback_token(fs->ctx, (GLfloat) GL_LINE_RESET_TOKEN);
 138       fs->reset_stipple_counter = GL_FALSE;
 139    }
 140    else {
 141       _mesa_feedback_token(fs->ctx, (GLfloat) GL_LINE_TOKEN);
 142    }
 143    feedback_vertex(fs->ctx, draw, prim->v[0]);
 144    feedback_vertex(fs->ctx, draw, prim->v[1]);
 145 }
 146
 147
 148 static void
 149 feedback_point( struct draw_stage *stage, struct prim_header *prim )
 150 {
 151    struct feedback_stage *fs = feedback_stage(stage);
 152    struct draw_context *draw = stage->draw;
 153    _mesa_feedback_token(fs->ctx, (GLfloat) GL_POINT_TOKEN);
 154    feedback_vertex(fs->ctx, draw, prim->v[0]);
 155 }
 156
 157
 158 static void
 159 feedback_flush( struct draw_stage *stage, unsigned flags )
 160 {
 161    /* no-op */
 162 }
 163
 164
 165 static void
 166 feedback_reset_stipple_counter( struct draw_stage *stage )
 167 {
 168    struct feedback_stage *fs = feedback_stage(stage);
 169    fs->reset_stipple_counter = GL_TRUE;
 170 }
 171
 172
 173 static void
 174 feedback_destroy( struct draw_stage *stage )
 175 {
 176    /* no-op */
 177 }
 178
 179 /**
 180  * Create GL feedback drawing stage.
 181  */
 182 static struct draw_stage *
 183 draw_glfeedback_stage(struct gl_context *ctx, struct draw_context *draw)
 184 {
 185    struct feedback_stage *fs = ST_CALLOC_STRUCT(feedback_stage);
 186
 187    fs->stage.draw = draw;
 188    fs->stage.next = NULL;
 189    fs->stage.point = feedback_point;
 190    fs->stage.line = feedback_line;
 191    fs->stage.tri = feedback_tri;
 192    fs->stage.flush = feedback_flush;
 193    fs->stage.reset_stipple_counter = feedback_reset_stipple_counter;
 194    fs->stage.destroy = feedback_destroy;
 195    fs->ctx = ctx;
 196
 197    return &fs->stage;
 198 }
 199
 200
 201
 202 /**********************************************************************
 203  * GL Selection functions
 204  **********************************************************************/
 205
 206 static void
 207 select_tri( struct draw_stage *stage, struct prim_header *prim )
 208 {
 209    struct feedback_stage *fs = feedback_stage(stage);
 210    _mesa_update_hitflag( fs->ctx, prim->v[0]->data[0][2] );
 211    _mesa_update_hitflag( fs->ctx, prim->v[1]->data[0][2] );
 212    _mesa_update_hitflag( fs->ctx, prim->v[2]->data[0][2] );
 213 }
 214
 215 static void
 216 select_line( struct draw_stage *stage, struct prim_header *prim )
 217 {
 218    struct feedback_stage *fs = feedback_stage(stage);
 219    _mesa_update_hitflag( fs->ctx, prim->v[0]->data[0][2] );
 220    _mesa_update_hitflag( fs->ctx, prim->v[1]->data[0][2] );
 221 }
 222
 223
 224 static void
 225 select_point( struct draw_stage *stage, struct prim_header *prim )
 226 {
 227    struct feedback_stage *fs = feedback_stage(stage);
 228    _mesa_update_hitflag( fs->ctx, prim->v[0]->data[0][2] );
 229 }
 230
 231
 232 static void
 233 select_flush( struct draw_stage *stage, unsigned flags )
 234 {
 235    /* no-op */
 236 }
 237
 238
 239 static void
 240 select_reset_stipple_counter( struct draw_stage *stage )
 241 {
 242    /* no-op */
 243 }
 244
 245 static void
 246 select_destroy( struct draw_stage *stage )
 247 {
 248    /* no-op */
 249 }
 250
 251
 252 /**
 253  * Create GL selection mode drawing stage.
 254  */
 255 static struct draw_stage *
 256 draw_glselect_stage(struct gl_context *ctx, struct draw_context *draw)
 257 {
 258    struct feedback_stage *fs = ST_CALLOC_STRUCT(feedback_stage);
 259
 260    fs->stage.draw = draw;
 261    fs->stage.next = NULL;
 262    fs->stage.point = select_point;
 263    fs->stage.line = select_line;
 264    fs->stage.tri = select_tri;
 265    fs->stage.flush = select_flush;
 266    fs->stage.reset_stipple_counter = select_reset_stipple_counter;
 267    fs->stage.destroy = select_destroy;
 268    fs->ctx = ctx;
 269
 270    return &fs->stage;
 271 }
 272
 273
 274 static void
 275 st_RenderMode(struct gl_context *ctx, GLenum newMode )
 276 {
 277    struct st_context *st = st_context(ctx);
 278    struct draw_context *draw = st->draw;
 279
 280    if (newMode == GL_RENDER) {
 281       /* restore normal VBO draw function */
 282       vbo_set_draw_func(ctx, st_draw_vbo);
 283    }
 284    else if (newMode == GL_SELECT) {
 285       if (!st->selection_stage)
 286          st->selection_stage = draw_glselect_stage(ctx, draw);
 287       draw_set_rasterize_stage(draw, st->selection_stage);
 288       /* Plug in new vbo draw function */
 289       vbo_set_draw_func(ctx, st_feedback_draw_vbo);
 290    }
 291    else {
 292       if (!st->feedback_stage)
 293          st->feedback_stage = draw_glfeedback_stage(ctx, draw);
 294       draw_set_rasterize_stage(draw, st->feedback_stage);
 295       /* Plug in new vbo draw function */
 296       vbo_set_draw_func(ctx, st_feedback_draw_vbo);
 297       /* need to generate/use a vertex program that emits pos/color/tex */
 298       st->dirty.st |= ST_NEW_VERTEX_PROGRAM;
 299    }
 300 }
 301
 302
 303
 304 void st_init_feedback_functions(struct dd_function_table *functions)
 305 {
 306    functions->RenderMode = st_RenderMode;
 307 }
 308
 309 #endif /* FEATURE_feedback */