src/mesa/state_tracker/st_cb_clear.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  * Copyright 2009 VMware, Inc.  All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29  /*
  30   * Authors:
  31   *   Keith Whitwell <keith@tungstengraphics.com>
  32   *   Brian Paul
  33   *   Michel Dänzer
  34   */
  35
  36 #include "main/glheader.h"
  37 #include "main/formats.h"
  38 #include "main/macros.h"
  39 #include "shader/prog_instruction.h"
  40 #include "st_context.h"
  41 #include "st_atom.h"
  42 #include "st_cb_accum.h"
  43 #include "st_cb_clear.h"
  44 #include "st_cb_fbo.h"
  45 #include "st_program.h"
  46 #include "st_public.h"
  47 #include "st_inlines.h"
  48
  49 #include "pipe/p_context.h"
  50 #include "util/u_inlines.h"
  51 #include "pipe/p_state.h"
  52 #include "pipe/p_defines.h"
  53 #include "util/u_format.h"
  54 #include "util/u_simple_shaders.h"
  55 #include "util/u_draw_quad.h"
  56
  57 #include "cso_cache/cso_context.h"
  58
  59
  60 void
  61 st_init_clear(struct st_context *st)
  62 {
  63    struct pipe_context *pipe = st->pipe;
  64
  65    memset(&st->clear.raster, 0, sizeof(st->clear.raster));
  66    st->clear.raster.gl_rasterization_rules = 1;
  67
  68    /* rasterizer state: bypass vertex shader, clipping and viewport */
  69    st->clear.raster.bypass_vs_clip_and_viewport = 1;
  70
  71    /* fragment shader state: color pass-through program */
  72    st->clear.fs =
  73       util_make_fragment_passthrough_shader(pipe);
  74
  75    /* vertex shader state: color/position pass-through */
  76    {
  77       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
  78                                       TGSI_SEMANTIC_COLOR };
  79       const uint semantic_indexes[] = { 0, 0 };
  80       st->clear.vs = util_make_vertex_passthrough_shader(pipe, 2,
  81                                                          semantic_names,
  82                                                          semantic_indexes);
  83    }
  84 }
  85
  86
  87 void
  88 st_destroy_clear(struct st_context *st)
  89 {
  90    if (st->clear.fs) {
  91       cso_delete_fragment_shader(st->cso_context, st->clear.fs);
  92       st->clear.fs = NULL;
  93    }
  94    if (st->clear.vs) {
  95       cso_delete_vertex_shader(st->cso_context, st->clear.vs);
  96       st->clear.vs = NULL;
  97    }
  98    if (st->clear.vbuf) {
  99       pipe_buffer_reference(&st->clear.vbuf, NULL);
 100       st->clear.vbuf = NULL;
 101    }
 102 }
 103
 104
 105 /**
 106  * Draw a screen-aligned quadrilateral.
 107  * Coords are window coords with y=0=bottom.  These will be passed
 108  * through unmodified to the rasterizer as we have set
 109  * rasterizer->bypass_vs_clip_and_viewport.
 110  */
 111 static void
 112 draw_quad(GLcontext *ctx,
 113           float x0, float y0, float x1, float y1, GLfloat z,
 114           const GLfloat color[4])
 115 {
 116    struct st_context *st = ctx->st;
 117    struct pipe_context *pipe = st->pipe;
 118
 119    /* XXX: Need to improve buffer_write to allow NO_WAIT (as well as
 120     * no_flush) updates to buffers where we know there is no conflict
 121     * with previous data.  Currently using max_slots > 1 will cause
 122     * synchronous rendering if the driver flushes its command buffers
 123     * between one bitmap and the next.  Our flush hook below isn't
 124     * sufficient to catch this as the driver doesn't tell us when it
 125     * flushes its own command buffers.  Until this gets fixed, pay the
 126     * price of allocating a new buffer for each bitmap cache-flush to
 127     * avoid synchronous rendering.
 128     */
 129    const GLuint max_slots = 1; /* 1024 / sizeof(st->clear.vertices); */
 130    GLuint i;
 131
 132    if (st->clear.vbuf_slot >= max_slots) {
 133       pipe_buffer_reference(&st->clear.vbuf, NULL);
 134       st->clear.vbuf_slot = 0;
 135    }
 136
 137    if (!st->clear.vbuf) {
 138       st->clear.vbuf = pipe_buffer_create(pipe->screen, 32, PIPE_BUFFER_USAGE_VERTEX,
 139                                           max_slots * sizeof(st->clear.vertices));
 140    }
 141
 142    /* positions */
 143    st->clear.vertices[0][0][0] = x0;
 144    st->clear.vertices[0][0][1] = y0;
 145
 146    st->clear.vertices[1][0][0] = x1;
 147    st->clear.vertices[1][0][1] = y0;
 148
 149    st->clear.vertices[2][0][0] = x1;
 150    st->clear.vertices[2][0][1] = y1;
 151
 152    st->clear.vertices[3][0][0] = x0;
 153    st->clear.vertices[3][0][1] = y1;
 154
 155    /* same for all verts: */
 156    for (i = 0; i < 4; i++) {
 157       st->clear.vertices[i][0][2] = z;
 158       st->clear.vertices[i][0][3] = 1.0;
 159       st->clear.vertices[i][1][0] = color[0];
 160       st->clear.vertices[i][1][1] = color[1];
 161       st->clear.vertices[i][1][2] = color[2];
 162       st->clear.vertices[i][1][3] = color[3];
 163    }
 164
 165    /* put vertex data into vbuf */
 166    st_no_flush_pipe_buffer_write_nooverlap(st, st->clear.vbuf,
 167                                            st->clear.vbuf_slot * sizeof(st->clear.vertices),
 168                                            sizeof(st->clear.vertices),
 169                                            st->clear.vertices);
 170
 171    /* draw */
 172    util_draw_vertex_buffer(pipe,
 173                            st->clear.vbuf,
 174                            st->clear.vbuf_slot * sizeof(st->clear.vertices),
 175                            PIPE_PRIM_TRIANGLE_FAN,
 176                            4,  /* verts */
 177                            2); /* attribs/vert */
 178
 179    /* Increment slot */
 180    st->clear.vbuf_slot++;
 181 }
 182
 183
 184
 185 /**
 186  * Do glClear by drawing a quadrilateral.
 187  * The vertices of the quad will be computed from the
 188  * ctx->DrawBuffer->_X/Ymin/max fields.
 189  */
 190 static void
 191 clear_with_quad(GLcontext *ctx,
 192                 GLboolean color, GLboolean depth, GLboolean stencil)
 193 {
 194    struct st_context *st = ctx->st;
 195    const GLfloat x0 = (GLfloat) ctx->DrawBuffer->_Xmin;
 196    const GLfloat x1 = (GLfloat) ctx->DrawBuffer->_Xmax;
 197    GLfloat y0, y1;
 198
 199    if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
 200       y0 = (GLfloat) (ctx->DrawBuffer->Height - ctx->DrawBuffer->_Ymax);
 201       y1 = (GLfloat) (ctx->DrawBuffer->Height - ctx->DrawBuffer->_Ymin);
 202    }
 203    else {
 204       y0 = (GLfloat) ctx->DrawBuffer->_Ymin;
 205       y1 = (GLfloat) ctx->DrawBuffer->_Ymax;
 206    }
 207
 208    /*
 209    printf("%s %s%s%s %f,%f %f,%f\n", __FUNCTION__,
 210           color ? "color, " : "",
 211           depth ? "depth, " : "",
 212           stencil ? "stencil" : "",
 213           x0, y0,
 214           x1, y1);
 215    */
 216
 217    cso_save_blend(st->cso_context);
 218    cso_save_depth_stencil_alpha(st->cso_context);
 219    cso_save_rasterizer(st->cso_context);
 220    cso_save_fragment_shader(st->cso_context);
 221    cso_save_vertex_shader(st->cso_context);
 222
 223    /* blend state: RGBA masking */
 224    {
 225       struct pipe_blend_state blend;
 226       memset(&blend, 0, sizeof(blend));
 227       blend.rt[0].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
 228       blend.rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 229       blend.rt[0].rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
 230       blend.rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
 231       if (color) {
 232          if (ctx->Color.ColorMask[0][0])
 233             blend.rt[0].colormask |= PIPE_MASK_R;
 234          if (ctx->Color.ColorMask[0][1])
 235             blend.rt[0].colormask |= PIPE_MASK_G;
 236          if (ctx->Color.ColorMask[0][2])
 237             blend.rt[0].colormask |= PIPE_MASK_B;
 238          if (ctx->Color.ColorMask[0][3])
 239             blend.rt[0].colormask |= PIPE_MASK_A;
 240          if (st->ctx->Color.DitherFlag)
 241             blend.dither = 1;
 242       }
 243       cso_set_blend(st->cso_context, &blend);
 244    }
 245
 246    /* depth_stencil state: always pass/set to ref value */
 247    {
 248       struct pipe_depth_stencil_alpha_state depth_stencil;
 249       memset(&depth_stencil, 0, sizeof(depth_stencil));
 250       if (depth) {
 251          depth_stencil.depth.enabled = 1;
 252          depth_stencil.depth.writemask = 1;
 253          depth_stencil.depth.func = PIPE_FUNC_ALWAYS;
 254       }
 255
 256       if (stencil) {
 257          struct pipe_stencil_ref stencil_ref;
 258          memset(&stencil_ref, 0, sizeof(stencil_ref));
 259          depth_stencil.stencil[0].enabled = 1;
 260          depth_stencil.stencil[0].func = PIPE_FUNC_ALWAYS;
 261          depth_stencil.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
 262          depth_stencil.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
 263          depth_stencil.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
 264          depth_stencil.stencil[0].valuemask = 0xff;
 265          depth_stencil.stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
 266          stencil_ref.ref_value[0] = ctx->Stencil.Clear;
 267          cso_set_stencil_ref(st->cso_context, &stencil_ref);
 268       }
 269
 270       cso_set_depth_stencil_alpha(st->cso_context, &depth_stencil);
 271    }
 272
 273    cso_set_rasterizer(st->cso_context, &st->clear.raster);
 274
 275    cso_set_fragment_shader_handle(st->cso_context, st->clear.fs);
 276    cso_set_vertex_shader_handle(st->cso_context, st->clear.vs);
 277
 278    /* draw quad matching scissor rect (XXX verify coord round-off) */
 279    draw_quad(ctx, x0, y0, x1, y1, (GLfloat) ctx->Depth.Clear, ctx->Color.ClearColor);
 280
 281    /* Restore pipe state */
 282    cso_restore_blend(st->cso_context);
 283    cso_restore_depth_stencil_alpha(st->cso_context);
 284    cso_restore_rasterizer(st->cso_context);
 285    cso_restore_fragment_shader(st->cso_context);
 286    cso_restore_vertex_shader(st->cso_context);
 287
 288 }
 289
 290
 291 /**
 292  * Determine if we need to clear the depth buffer by drawing a quad.
 293  */
 294 static INLINE GLboolean
 295 check_clear_color_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
 296 {
 297    if (ctx->Scissor.Enabled &&
 298        (ctx->Scissor.X != 0 ||
 299         ctx->Scissor.Y != 0 ||
 300         ctx->Scissor.Width < rb->Width ||
 301         ctx->Scissor.Height < rb->Height))
 302       return TRUE;
 303
 304    if (!ctx->Color.ColorMask[0][0] ||
 305        !ctx->Color.ColorMask[0][1] ||
 306        !ctx->Color.ColorMask[0][2] ||
 307        !ctx->Color.ColorMask[0][3])
 308       return TRUE;
 309
 310    return FALSE;
 311 }
 312
 313
 314 static INLINE GLboolean
 315 check_clear_depth_stencil_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
 316 {
 317    const GLuint stencilMax = 0xff;
 318    GLboolean maskStencil
 319       = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
 320
 321    assert(rb->Format == MESA_FORMAT_S8 ||
 322           rb->Format == MESA_FORMAT_Z24_S8 ||
 323           rb->Format == MESA_FORMAT_S8_Z24);
 324
 325    if (ctx->Scissor.Enabled &&
 326        (ctx->Scissor.X != 0 ||
 327         ctx->Scissor.Y != 0 ||
 328         ctx->Scissor.Width < rb->Width ||
 329         ctx->Scissor.Height < rb->Height))
 330       return TRUE;
 331
 332    if (maskStencil)
 333       return TRUE;
 334
 335    return FALSE;
 336 }
 337
 338
 339 /**
 340  * Determine if we need to clear the depth buffer by drawing a quad.
 341  */
 342 static INLINE GLboolean
 343 check_clear_depth_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
 344 {
 345    const struct st_renderbuffer *strb = st_renderbuffer(rb);
 346    const GLboolean isDS = util_format_is_depth_and_stencil(strb->surface->format);
 347
 348    if (ctx->Scissor.Enabled &&
 349        (ctx->Scissor.X != 0 ||
 350         ctx->Scissor.Y != 0 ||
 351         ctx->Scissor.Width < rb->Width ||
 352         ctx->Scissor.Height < rb->Height))
 353       return TRUE;
 354
 355    if (isDS &&
 356        ctx->DrawBuffer->Visual.stencilBits > 0)
 357       return TRUE;
 358
 359    return FALSE;
 360 }
 361
 362
 363 /**
 364  * Determine if we need to clear the stencil buffer by drawing a quad.
 365  */
 366 static INLINE GLboolean
 367 check_clear_stencil_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
 368 {
 369    const struct st_renderbuffer *strb = st_renderbuffer(rb);
 370    const GLboolean isDS = util_format_is_depth_and_stencil(strb->surface->format);
 371    const GLuint stencilMax = 0xff;
 372    const GLboolean maskStencil
 373       = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
 374
 375    assert(rb->Format == MESA_FORMAT_S8 ||
 376           rb->Format == MESA_FORMAT_Z24_S8 ||
 377           rb->Format == MESA_FORMAT_S8_Z24);
 378
 379    if (maskStencil)
 380       return TRUE;
 381
 382    if (ctx->Scissor.Enabled &&
 383        (ctx->Scissor.X != 0 ||
 384         ctx->Scissor.Y != 0 ||
 385         ctx->Scissor.Width < rb->Width ||
 386         ctx->Scissor.Height < rb->Height))
 387       return TRUE;
 388
 389    /* This is correct, but it is necessary to look at the depth clear
 390     * value held in the surface when it comes time to issue the clear,
 391     * rather than taking depth and stencil clear values from the
 392     * current state.
 393     */
 394    if (isDS &&
 395        ctx->DrawBuffer->Visual.depthBits > 0)
 396       return TRUE;
 397
 398    return FALSE;
 399 }
 400
 401
 402
 403 void st_flush_clear( struct st_context *st )
 404 {
 405    /* Release vertex buffer to avoid synchronous rendering if we were
 406     * to map it in the next frame.
 407     */
 408    pipe_buffer_reference(&st->clear.vbuf, NULL);
 409    st->clear.vbuf_slot = 0;
 410 }
 411
 412
 413
 414 /**
 415  * Called via ctx->Driver.Clear()
 416  * XXX: doesn't pick up the differences between front/back/left/right
 417  * clears.  Need to sort that out...
 418  */
 419 static void st_clear(GLcontext *ctx, GLbitfield mask)
 420 {
 421    static const GLbitfield BUFFER_BITS_DS
 422       = (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL);
 423    struct st_context *st = ctx->st;
 424    struct gl_renderbuffer *depthRb
 425       = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
 426    struct gl_renderbuffer *stencilRb
 427       = ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
 428    GLbitfield quad_buffers = 0;
 429    GLbitfield clear_buffers = 0;
 430    GLuint i;
 431
 432    /* This makes sure the pipe has the latest scissor, etc values */
 433    st_validate_state( st );
 434
 435    if (mask & BUFFER_BITS_COLOR) {
 436       for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
 437          GLuint b = ctx->DrawBuffer->_ColorDrawBufferIndexes[i];
 438
 439          if (mask & (1 << b)) {
 440             struct gl_renderbuffer *rb
 441                = ctx->DrawBuffer->Attachment[b].Renderbuffer;
 442             struct st_renderbuffer *strb;
 443
 444             assert(rb);
 445
 446             strb = st_renderbuffer(rb);
 447
 448             if (!strb->surface)
 449                continue;
 450
 451             if (check_clear_color_with_quad( ctx, rb ))
 452                quad_buffers |= PIPE_CLEAR_COLOR;
 453             else
 454                clear_buffers |= PIPE_CLEAR_COLOR;
 455          }
 456       }
 457    }
 458
 459    if ((mask & BUFFER_BITS_DS) == BUFFER_BITS_DS && depthRb == stencilRb) {
 460       /* clearing combined depth + stencil */
 461       struct st_renderbuffer *strb = st_renderbuffer(depthRb);
 462
 463       if (strb->surface) {
 464          if (check_clear_depth_stencil_with_quad(ctx, depthRb))
 465             quad_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
 466          else
 467             clear_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
 468       }
 469    }
 470    else {
 471       /* separate depth/stencil clears */
 472       if (mask & BUFFER_BIT_DEPTH) {
 473          struct st_renderbuffer *strb = st_renderbuffer(depthRb);
 474
 475          if (strb->surface) {
 476             if (check_clear_depth_with_quad(ctx, depthRb))
 477                quad_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
 478             else
 479                clear_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
 480          }
 481       }
 482       if (mask & BUFFER_BIT_STENCIL) {
 483          struct st_renderbuffer *strb = st_renderbuffer(stencilRb);
 484
 485          if (strb->surface) {
 486             if (check_clear_stencil_with_quad(ctx, stencilRb))
 487                quad_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
 488             else
 489                clear_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
 490          }
 491       }
 492    }
 493
 494    /*
 495     * If we're going to use clear_with_quad() for any reason, use it for
 496     * everything possible.
 497     */
 498    if (quad_buffers) {
 499       quad_buffers |= clear_buffers;
 500       clear_with_quad(ctx,
 501                       quad_buffers & PIPE_CLEAR_COLOR,
 502                       mask & BUFFER_BIT_DEPTH,
 503                       mask & BUFFER_BIT_STENCIL);
 504    } else if (clear_buffers)
 505       ctx->st->pipe->clear(ctx->st->pipe, clear_buffers, ctx->Color.ClearColor,
 506                            ctx->Depth.Clear, ctx->Stencil.Clear);
 507
 508    if (mask & BUFFER_BIT_ACCUM)
 509       st_clear_accum_buffer(ctx,
 510                             ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 511 }
 512
 513
 514 void st_init_clear_functions(struct dd_function_table *functions)
 515 {
 516    functions->Clear = st_clear;
 517 }