src/mesa/state_tracker/st_cb_clear.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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 VMWARE 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 <keithw@vmware.com>
  32   *   Brian Paul
  33   *   Michel Dänzer
  34   */
  35
  36 #include "main/errors.h"
  37 #include "main/glheader.h"
  38 #include "main/accum.h"
  39 #include "main/formats.h"
  40 #include "main/framebuffer.h"
  41 #include "main/macros.h"
  42 #include "main/glformats.h"
  43 #include "program/prog_instruction.h"
  44 #include "st_context.h"
  45 #include "st_atom.h"
  46 #include "st_cb_bitmap.h"
  47 #include "st_cb_clear.h"
  48 #include "st_cb_fbo.h"
  49 #include "st_draw.h"
  50 #include "st_format.h"
  51 #include "st_nir.h"
  52 #include "st_program.h"
  53 #include "st_util.h"
  54
  55 #include "pipe/p_context.h"
  56 #include "pipe/p_shader_tokens.h"
  57 #include "pipe/p_state.h"
  58 #include "pipe/p_defines.h"
  59 #include "util/u_format.h"
  60 #include "util/u_inlines.h"
  61 #include "util/u_simple_shaders.h"
  62
  63 #include "cso_cache/cso_context.h"
  64
  65
  66 /**
  67  * Do per-context initialization for glClear.
  68  */
  69 void
  70 st_init_clear(struct st_context *st)
  71 {
  72    memset(&st->clear, 0, sizeof(st->clear));
  73
  74    st->clear.raster.half_pixel_center = 1;
  75    st->clear.raster.bottom_edge_rule = 1;
  76    st->clear.raster.depth_clip_near = 1;
  77    st->clear.raster.depth_clip_far = 1;
  78 }
  79
  80
  81 /**
  82  * Free per-context state for glClear.
  83  */
  84 void
  85 st_destroy_clear(struct st_context *st)
  86 {
  87    if (st->clear.fs) {
  88       cso_delete_fragment_shader(st->cso_context, st->clear.fs);
  89       st->clear.fs = NULL;
  90    }
  91    if (st->clear.vs) {
  92       cso_delete_vertex_shader(st->cso_context, st->clear.vs);
  93       st->clear.vs = NULL;
  94    }
  95    if (st->clear.vs_layered) {
  96       cso_delete_vertex_shader(st->cso_context, st->clear.vs_layered);
  97       st->clear.vs_layered = NULL;
  98    }
  99    if (st->clear.gs_layered) {
 100       cso_delete_geometry_shader(st->cso_context, st->clear.gs_layered);
 101       st->clear.gs_layered = NULL;
 102    }
 103 }
 104
 105
 106 /**
 107  * Helper function to set the fragment shaders.
 108  */
 109 static inline void
 110 set_fragment_shader(struct st_context *st)
 111 {
 112    struct pipe_screen *pscreen = st->pipe->screen;
 113    bool use_nir = PIPE_SHADER_IR_NIR ==
 114       pscreen->get_shader_param(pscreen, PIPE_SHADER_VERTEX,
 115                                 PIPE_SHADER_CAP_PREFERRED_IR);
 116
 117    if (!st->clear.fs) {
 118       if (use_nir) {
 119          unsigned inputs[] = { VARYING_SLOT_VAR0 };
 120          unsigned outputs[] = { FRAG_RESULT_COLOR };
 121          unsigned interpolation[] = { INTERP_MODE_FLAT };
 122          st->clear.fs = st_nir_make_passthrough_shader(st, "clear FS",
 123                                                        MESA_SHADER_FRAGMENT,
 124                                                        1, inputs, outputs,
 125                                                        interpolation, 0);
 126       } else {
 127          st->clear.fs =
 128             util_make_fragment_passthrough_shader(st->pipe,
 129                                                   TGSI_SEMANTIC_GENERIC,
 130                                                   TGSI_INTERPOLATE_CONSTANT,
 131                                                   TRUE);
 132       }
 133    }
 134
 135    cso_set_fragment_shader_handle(st->cso_context, st->clear.fs);
 136 }
 137
 138
 139 static void *
 140 make_nir_clear_vertex_shader(struct st_context *st, bool layered)
 141 {
 142    const char *shader_name = layered ? "layered clear VS" : "clear VS";
 143    unsigned inputs[] = {
 144       VERT_ATTRIB_POS,
 145       VERT_ATTRIB_GENERIC0,
 146       SYSTEM_VALUE_INSTANCE_ID,
 147    };
 148    unsigned outputs[] = {
 149       VARYING_SLOT_POS,
 150       VARYING_SLOT_VAR0,
 151       VARYING_SLOT_LAYER
 152    };
 153
 154    return st_nir_make_passthrough_shader(st, shader_name, MESA_SHADER_VERTEX,
 155                                          layered ? 3 : 2, inputs, outputs,
 156                                          NULL, (1 << 2));
 157 }
 158
 159
 160 /**
 161  * Helper function to set the vertex shader.
 162  */
 163 static inline void
 164 set_vertex_shader(struct st_context *st)
 165 {
 166    struct pipe_screen *pscreen = st->pipe->screen;
 167    bool use_nir = PIPE_SHADER_IR_NIR ==
 168       pscreen->get_shader_param(pscreen, PIPE_SHADER_VERTEX,
 169                                 PIPE_SHADER_CAP_PREFERRED_IR);
 170
 171    /* vertex shader - still required to provide the linkage between
 172     * fragment shader input semantics and vertex_element/buffers.
 173     */
 174    if (!st->clear.vs)
 175    {
 176       if (use_nir) {
 177          st->clear.vs = make_nir_clear_vertex_shader(st, false);
 178       } else {
 179          const enum tgsi_semantic semantic_names[] = {
 180             TGSI_SEMANTIC_POSITION,
 181             TGSI_SEMANTIC_GENERIC
 182          };
 183          const uint semantic_indexes[] = { 0, 0 };
 184          st->clear.vs = util_make_vertex_passthrough_shader(st->pipe, 2,
 185                                                             semantic_names,
 186                                                             semantic_indexes,
 187                                                             FALSE);
 188       }
 189    }
 190
 191    cso_set_vertex_shader_handle(st->cso_context, st->clear.vs);
 192    cso_set_geometry_shader_handle(st->cso_context, NULL);
 193 }
 194
 195
 196 static void
 197 set_vertex_shader_layered(struct st_context *st)
 198 {
 199    struct pipe_context *pipe = st->pipe;
 200    struct pipe_screen *pscreen = pipe->screen;
 201    bool use_nir = PIPE_SHADER_IR_NIR ==
 202       pscreen->get_shader_param(pscreen, PIPE_SHADER_VERTEX,
 203                                 PIPE_SHADER_CAP_PREFERRED_IR);
 204
 205    if (!pipe->screen->get_param(pipe->screen, PIPE_CAP_TGSI_INSTANCEID)) {
 206       assert(!"Got layered clear, but VS instancing is unsupported");
 207       set_vertex_shader(st);
 208       return;
 209    }
 210
 211    if (!st->clear.vs_layered) {
 212       bool vs_layer =
 213          pipe->screen->get_param(pipe->screen, PIPE_CAP_TGSI_VS_LAYER_VIEWPORT);
 214       if (vs_layer) {
 215          st->clear.vs_layered =
 216             use_nir ? make_nir_clear_vertex_shader(st, true)
 217                     : util_make_layered_clear_vertex_shader(pipe);
 218       } else {
 219          st->clear.vs_layered = util_make_layered_clear_helper_vertex_shader(pipe);
 220          st->clear.gs_layered = util_make_layered_clear_geometry_shader(pipe);
 221       }
 222    }
 223
 224    cso_set_vertex_shader_handle(st->cso_context, st->clear.vs_layered);
 225    cso_set_geometry_shader_handle(st->cso_context, st->clear.gs_layered);
 226 }
 227
 228
 229 /**
 230  * Do glClear by drawing a quadrilateral.
 231  * The vertices of the quad will be computed from the
 232  * ctx->DrawBuffer->_X/Ymin/max fields.
 233  */
 234 static void
 235 clear_with_quad(struct gl_context *ctx, unsigned clear_buffers)
 236 {
 237    struct st_context *st = st_context(ctx);
 238    struct cso_context *cso = st->cso_context;
 239    const struct gl_framebuffer *fb = ctx->DrawBuffer;
 240    const GLfloat fb_width = (GLfloat) fb->Width;
 241    const GLfloat fb_height = (GLfloat) fb->Height;
 242
 243    _mesa_update_draw_buffer_bounds(ctx, ctx->DrawBuffer);
 244
 245    const GLfloat x0 = (GLfloat) ctx->DrawBuffer->_Xmin / fb_width * 2.0f - 1.0f;
 246    const GLfloat x1 = (GLfloat) ctx->DrawBuffer->_Xmax / fb_width * 2.0f - 1.0f;
 247    const GLfloat y0 = (GLfloat) ctx->DrawBuffer->_Ymin / fb_height * 2.0f - 1.0f;
 248    const GLfloat y1 = (GLfloat) ctx->DrawBuffer->_Ymax / fb_height * 2.0f - 1.0f;
 249    unsigned num_layers = st->state.fb_num_layers;
 250
 251    /*
 252    printf("%s %s%s%s %f,%f %f,%f\n", __func__,
 253           color ? "color, " : "",
 254           depth ? "depth, " : "",
 255           stencil ? "stencil" : "",
 256           x0, y0,
 257           x1, y1);
 258    */
 259
 260    cso_save_state(cso, (CSO_BIT_BLEND |
 261                         CSO_BIT_STENCIL_REF |
 262                         CSO_BIT_DEPTH_STENCIL_ALPHA |
 263                         CSO_BIT_RASTERIZER |
 264                         CSO_BIT_SAMPLE_MASK |
 265                         CSO_BIT_MIN_SAMPLES |
 266                         CSO_BIT_VIEWPORT |
 267                         CSO_BIT_STREAM_OUTPUTS |
 268                         CSO_BIT_VERTEX_ELEMENTS |
 269                         CSO_BIT_AUX_VERTEX_BUFFER_SLOT |
 270                         (st->active_queries ? CSO_BIT_PAUSE_QUERIES : 0) |
 271                         CSO_BITS_ALL_SHADERS));
 272
 273    /* blend state: RGBA masking */
 274    {
 275       struct pipe_blend_state blend;
 276       memset(&blend, 0, sizeof(blend));
 277       if (clear_buffers & PIPE_CLEAR_COLOR) {
 278          int num_buffers = ctx->Extensions.EXT_draw_buffers2 ?
 279                            ctx->DrawBuffer->_NumColorDrawBuffers : 1;
 280          int i;
 281
 282          blend.independent_blend_enable = num_buffers > 1;
 283
 284          for (i = 0; i < num_buffers; i++) {
 285             if (!(clear_buffers & (PIPE_CLEAR_COLOR0 << i)))
 286                continue;
 287
 288             blend.rt[i].colormask = GET_COLORMASK(ctx->Color.ColorMask, i);
 289          }
 290
 291          if (ctx->Color.DitherFlag)
 292             blend.dither = 1;
 293       }
 294       cso_set_blend(cso, &blend);
 295    }
 296
 297    /* depth_stencil state: always pass/set to ref value */
 298    {
 299       struct pipe_depth_stencil_alpha_state depth_stencil;
 300       memset(&depth_stencil, 0, sizeof(depth_stencil));
 301       if (clear_buffers & PIPE_CLEAR_DEPTH) {
 302          depth_stencil.depth.enabled = 1;
 303          depth_stencil.depth.writemask = 1;
 304          depth_stencil.depth.func = PIPE_FUNC_ALWAYS;
 305       }
 306
 307       if (clear_buffers & PIPE_CLEAR_STENCIL) {
 308          struct pipe_stencil_ref stencil_ref;
 309          memset(&stencil_ref, 0, sizeof(stencil_ref));
 310          depth_stencil.stencil[0].enabled = 1;
 311          depth_stencil.stencil[0].func = PIPE_FUNC_ALWAYS;
 312          depth_stencil.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
 313          depth_stencil.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
 314          depth_stencil.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
 315          depth_stencil.stencil[0].valuemask = 0xff;
 316          depth_stencil.stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
 317          stencil_ref.ref_value[0] = ctx->Stencil.Clear;
 318          cso_set_stencil_ref(cso, &stencil_ref);
 319       }
 320
 321       cso_set_depth_stencil_alpha(cso, &depth_stencil);
 322    }
 323
 324    cso_set_vertex_elements(cso, 2, st->util_velems);
 325    cso_set_stream_outputs(cso, 0, NULL, NULL);
 326    cso_set_sample_mask(cso, ~0);
 327    cso_set_min_samples(cso, 1);
 328    cso_set_rasterizer(cso, &st->clear.raster);
 329
 330    /* viewport state: viewport matching window dims */
 331    cso_set_viewport_dims(st->cso_context, fb_width, fb_height,
 332                          st_fb_orientation(fb) == Y_0_TOP);
 333
 334    set_fragment_shader(st);
 335    cso_set_tessctrl_shader_handle(cso, NULL);
 336    cso_set_tesseval_shader_handle(cso, NULL);
 337
 338    if (num_layers > 1)
 339       set_vertex_shader_layered(st);
 340    else
 341       set_vertex_shader(st);
 342
 343    /* draw quad matching scissor rect.
 344     *
 345     * Note: if we're only clearing depth/stencil we still setup vertices
 346     * with color, but they'll be ignored.
 347     *
 348     * We can't translate the clear color to the colorbuffer format,
 349     * because different colorbuffers may have different formats.
 350     */
 351    if (!st_draw_quad(st, x0, y0, x1, y1,
 352                      ctx->Depth.Clear * 2.0f - 1.0f,
 353                      0.0f, 0.0f, 0.0f, 0.0f,
 354                      (const float *) &ctx->Color.ClearColor.f,
 355                      num_layers)) {
 356       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glClear");
 357    }
 358
 359    /* Restore pipe state */
 360    cso_restore_state(cso);
 361 }
 362
 363
 364 /**
 365  * Return if the scissor must be enabled during the clear.
 366  */
 367 static inline GLboolean
 368 is_scissor_enabled(struct gl_context *ctx, struct gl_renderbuffer *rb)
 369 {
 370    const struct gl_scissor_rect *scissor = &ctx->Scissor.ScissorArray[0];
 371
 372    return (ctx->Scissor.EnableFlags & 1) &&
 373           (scissor->X > 0 ||
 374            scissor->Y > 0 ||
 375            scissor->X + scissor->Width < (int)rb->Width ||
 376            scissor->Y + scissor->Height < (int)rb->Height);
 377 }
 378
 379 /**
 380  * Return if window rectangles must be enabled during the clear.
 381  */
 382 static inline bool
 383 is_window_rectangle_enabled(struct gl_context *ctx)
 384 {
 385    if (ctx->DrawBuffer == ctx->WinSysDrawBuffer)
 386       return false;
 387    return ctx->Scissor.NumWindowRects > 0 ||
 388       ctx->Scissor.WindowRectMode == GL_INCLUSIVE_EXT;
 389 }
 390
 391
 392 /**
 393  * Return if all of the stencil bits are masked.
 394  */
 395 static inline GLboolean
 396 is_stencil_disabled(struct gl_context *ctx, struct gl_renderbuffer *rb)
 397 {
 398    const GLuint stencilMax = 0xff;
 399
 400    assert(_mesa_get_format_bits(rb->Format, GL_STENCIL_BITS) > 0);
 401    return (ctx->Stencil.WriteMask[0] & stencilMax) == 0;
 402 }
 403
 404
 405 /**
 406  * Return if any of the stencil bits are masked.
 407  */
 408 static inline GLboolean
 409 is_stencil_masked(struct gl_context *ctx, struct gl_renderbuffer *rb)
 410 {
 411    const GLuint stencilMax = 0xff;
 412
 413    assert(_mesa_get_format_bits(rb->Format, GL_STENCIL_BITS) > 0);
 414    return (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
 415 }
 416
 417
 418 /**
 419  * Called via ctx->Driver.Clear()
 420  */
 421 static void
 422 st_Clear(struct gl_context *ctx, GLbitfield mask)
 423 {
 424    struct st_context *st = st_context(ctx);
 425    struct gl_renderbuffer *depthRb
 426       = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
 427    struct gl_renderbuffer *stencilRb
 428       = ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
 429    GLbitfield quad_buffers = 0x0;
 430    GLbitfield clear_buffers = 0x0;
 431    GLuint i;
 432
 433    st_flush_bitmap_cache(st);
 434    st_invalidate_readpix_cache(st);
 435
 436    /* This makes sure the pipe has the latest scissor, etc values */
 437    st_validate_state(st, ST_PIPELINE_CLEAR);
 438
 439    if (mask & BUFFER_BITS_COLOR) {
 440       for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
 441          gl_buffer_index b = ctx->DrawBuffer->_ColorDrawBufferIndexes[i];
 442
 443          if (b != BUFFER_NONE && mask & (1 << b)) {
 444             struct gl_renderbuffer *rb
 445                = ctx->DrawBuffer->Attachment[b].Renderbuffer;
 446             struct st_renderbuffer *strb = st_renderbuffer(rb);
 447             int colormask_index = ctx->Extensions.EXT_draw_buffers2 ? i : 0;
 448
 449             if (!strb || !strb->surface)
 450                continue;
 451
 452             unsigned colormask =
 453                GET_COLORMASK(ctx->Color.ColorMask, colormask_index);
 454
 455             if (!colormask)
 456                continue;
 457
 458             unsigned surf_colormask =
 459                util_format_colormask(util_format_description(strb->surface->format));
 460
 461             if (is_scissor_enabled(ctx, rb) ||
 462                 is_window_rectangle_enabled(ctx) ||
 463                 ((colormask & surf_colormask) != surf_colormask))
 464                quad_buffers |= PIPE_CLEAR_COLOR0 << i;
 465             else
 466                clear_buffers |= PIPE_CLEAR_COLOR0 << i;
 467          }
 468       }
 469    }
 470
 471    if (mask & BUFFER_BIT_DEPTH) {
 472       struct st_renderbuffer *strb = st_renderbuffer(depthRb);
 473
 474       if (strb->surface && ctx->Depth.Mask) {
 475          if (is_scissor_enabled(ctx, depthRb) ||
 476              is_window_rectangle_enabled(ctx))
 477             quad_buffers |= PIPE_CLEAR_DEPTH;
 478          else
 479             clear_buffers |= PIPE_CLEAR_DEPTH;
 480       }
 481    }
 482    if (mask & BUFFER_BIT_STENCIL) {
 483       struct st_renderbuffer *strb = st_renderbuffer(stencilRb);
 484
 485       if (strb->surface && !is_stencil_disabled(ctx, stencilRb)) {
 486          if (is_scissor_enabled(ctx, stencilRb) ||
 487              is_window_rectangle_enabled(ctx) ||
 488              is_stencil_masked(ctx, stencilRb))
 489             quad_buffers |= PIPE_CLEAR_STENCIL;
 490          else
 491             clear_buffers |= PIPE_CLEAR_STENCIL;
 492       }
 493    }
 494
 495    /* Always clear depth and stencil together.
 496     * This can only happen when the stencil writemask is not a full mask.
 497     */
 498    if (quad_buffers & PIPE_CLEAR_DEPTHSTENCIL &&
 499        clear_buffers & PIPE_CLEAR_DEPTHSTENCIL) {
 500       quad_buffers |= clear_buffers & PIPE_CLEAR_DEPTHSTENCIL;
 501       clear_buffers &= ~PIPE_CLEAR_DEPTHSTENCIL;
 502    }
 503
 504    /* Only use quad-based clearing for the renderbuffers which cannot
 505     * use pipe->clear. We want to always use pipe->clear for the other
 506     * renderbuffers, because it's likely to be faster.
 507     */
 508    if (clear_buffers) {
 509       /* We can't translate the clear color to the colorbuffer format,
 510        * because different colorbuffers may have different formats.
 511        */
 512       st->pipe->clear(st->pipe, clear_buffers,
 513                       (union pipe_color_union*)&ctx->Color.ClearColor,
 514                       ctx->Depth.Clear, ctx->Stencil.Clear);
 515    }
 516    if (quad_buffers) {
 517       clear_with_quad(ctx, quad_buffers);
 518    }
 519    if (mask & BUFFER_BIT_ACCUM)
 520       _mesa_clear_accum_buffer(ctx);
 521 }
 522
 523
 524 void
 525 st_init_clear_functions(struct dd_function_table *functions)
 526 {
 527    functions->Clear = st_Clear;
 528 }